CN117346990B - Device and method for measuring vibration characteristics of rotary propulsion shaft - Google Patents
Device and method for measuring vibration characteristics of rotary propulsion shaft Download PDFInfo
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Abstract
The invention relates to a rotary propulsion shaft vibration characteristic measuring device, wherein a plurality of vibration acceleration sensors are fixed on the surface of a shaft body; a vibration acceleration sensor data acquisition module is arranged beside the axial direction of each vibration acceleration sensor, and the two modules are connected through a wire; the force sensor is arranged at the center of a loading end surface of the shafting, the excitation device is arranged on a loading test platform of the loading end surface, and the force sensor and the excitation device are positioned on the same axis; the force sensor data acquisition module, the wireless exchanger and the data processor are arranged on the instrument test bed; the force sensor is connected with the force sensor data acquisition module by a wire; the wireless network is adopted between each data acquisition module and the wireless exchanger to realize communication connection, and the wireless exchanger and the data processor are directly connected by adopting a network cable. The invention can directly and effectively measure the vibration parameters on the time domain and the frequency domain of the rotary propulsion shaft, further acquire the vibration parameters such as the natural frequency, the vibration mode and the like, and is more concise, accurate and efficient.
Description
Technical Field
The invention relates to the technical field of ship vibration noise control, in particular to a device and a method for measuring vibration characteristics of a ship shafting in a rotating state.
Background
The propeller and the propeller shaft are important components of a ship power system, and are one of three main noise sources in the sailing process of the ship, in order to reduce vibration and noise externally transmitted by the propeller shaft system, quantitative technical indexes are required to be provided for inherent vibration characteristics of the propeller and the propeller shaft at the beginning of design, and particularly, the vibration characteristics of the propeller shaft under the simulated real working condition are measured and checked to judge whether a measured result can meet the specified technical requirements.
The biggest difficulty of the measurement of the vibration characteristics of the rotating propeller shaft is how to obtain the vibration characteristics of the surface of the shaft body efficiently, accurately and comprehensively, and because the propeller shaft is in a rotating state, if a wire is used for connecting a sensor and a data processor, the wire can face to be stirred off to cause damage to instrument and equipment, so that the vibration measurement method of a wired transmission mode cannot meet the vibration characteristic measurement of the rotating propeller shaft, and the data transmission needs to be solved through a wireless transmission method.
At present, two wireless transmission measurement methods are mainly available, the first is convolution induction measurement, the basic principle of which is that an eddy current sensor is used for inducing the displacement deflection of vibration of an object in certain displacement, the measured parameter is that the rotating vibration surface of a shaft body rotates for one circle in the circumferential direction and the reference point of the eddy current sensor is displaced relatively, the method can only measure the relative displacement parameter in the vibration time domain of a rotating propulsion shaft, the vibration acceleration parameter in the frequency domain can not be obtained, and the radial displacement parameter can not be measured, so that the measurement requirement of the vibration characteristic of the rotating propulsion shaft can not be fully met; the second is wireless remote sensing measurement, its basic principle is that the vibration sensor data on the rotating shaft body is transmitted to the data collector outside the rotating shaft body through electromagnetic field wireless remote sensing, the method can measure the vibration acceleration parameter on the rotating propulsion shaft frequency domain, but the measuring device has too many interfaces, a plurality of nodes are needed to realize the data back and forth conversion, the sensor can not be directly powered, the measuring method has complex process and high requirement on the installation condition, and is not easy to implement, in addition, the measuring system is easy to be interfered by the surrounding electromagnetic environment, the measuring precision is affected, and the measurement of the vibration characteristic of the rotating propulsion shaft can not be fully satisfied.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the device and the method for measuring the vibration characteristics of the rotating propeller shaft, which can directly and effectively measure the vibration acceleration and the frequency response function between the force and the acceleration of the rotating propeller shaft in the time domain and the frequency domain, further acquire the vibration parameters such as the natural frequency, the vibration mode and the like to meet the requirements of acoustic design technical index judgment and provide important support for the vibration characteristic evaluation of the shaft system under the rotating condition; and is more concise, accurate and efficient.
The technical scheme adopted by the invention for solving the technical problems is as follows:
The device comprises a vibration acceleration sensor, a vibration acceleration sensor data acquisition module, a force sensor, an excitation device, a force sensor data acquisition module, a wireless switch and a data processor;
The vibration acceleration sensors are fixed on the surface of the shaft body, the installation directions among the vibration acceleration sensors are consistent, and the vibration acceleration sensors are spaced at a certain distance and are positioned on the same straight line; the vibration acceleration sensor data acquisition modules are respectively arranged on the surface of the shaft body and correspond to the axial sides of each vibration acceleration sensor, and the vibration acceleration sensors are connected with the vibration acceleration sensor data acquisition modules through wires;
The force sensor is arranged at the center of a loading end surface of the shafting, the excitation device is arranged on a loading test platform of the loading end surface, and the axis of the excitation device and the force sensor are positioned on the same axis;
The force sensor data acquisition module, the wireless switch and the data processor are arranged on the instrument test bed and are not contacted with the surface of the shaft body; the force sensor is connected with the force sensor data acquisition module by a wire; the vibration acceleration sensor data acquisition module, the force sensor data acquisition module and the wireless switch adopt a wireless transmission mode to transmit signals, and the wireless switch and the data processor directly adopt a network cable to transmit signals.
In the scheme, the vibration acceleration sensor is connected with the shaft body through the mounting base, the vibration acceleration sensor is connected with the mounting base through threads, and the mounting base is bonded with the surface of the shaft body through glue; the natural frequency of the mounting base should meet 2.5 times of the maximum measurement frequency of the vibration acceleration sensor, namely f n≥2.5fm.
In the above scheme, the vibration acceleration sensor mounting position avoids the modal node of the propulsion shaft as much as possible.
In the scheme, the vibration acceleration sensor data acquisition module is connected with the shaft body through the mounting base, the vibration acceleration sensor data acquisition module is connected with the mounting base through threads, and the mounting base is bonded with the surface of the shaft body through glue.
In the scheme, the lead wire connected between the vibration acceleration sensor and the vibration acceleration sensor data acquisition module is fixed on the surface of the shaft body, so that the shaft body is prevented from shaking during rotation.
In the above scheme, the vibration acceleration sensor data acquisition module comprises a built-in power supply battery, a signal input acquisition port and a signal output transmitting antenna; the built-in power supply battery supplies power for the built-in power supply battery and the vibration acceleration sensor; the signal input acquisition port is connected with the signal output port of the vibration acceleration sensor to realize data acquisition; the signal output transmitting antenna adopts a wireless WIFI (wireless fidelity) and 2.4GHz transmitting frequency communication mode; the maximum sampling rate of the data acquisition module of the vibration acceleration sensor needs to be 2 times of the measurement frequency.
In the scheme, the force sensor data acquisition module comprises a built-in power supply battery, a signal input acquisition port and a signal output transmitting antenna; the built-in power supply battery supplies power for the built-in power supply battery and the force sensor; the signal input acquisition port is connected with the signal output port of the force acceleration sensor to realize data acquisition; the signal output transmitting antenna adopts a wireless WIFI (wireless fidelity) and 2-3 GHz transmitting frequency communication mode; the maximum sampling rate of the force sensor data acquisition module needs to be 2 times of the measurement frequency.
In the scheme, the wireless switch comprises a self-adaptive wired network interface, a 2-3 GHz omnidirectional high-gain external antenna and a 12-48V adaptive direct current power supply; the self-adaptive wired network interface is connected with the data processor through a network cable; the 2-3 GHz omnidirectional high-gain external antenna is used for receiving signals from the vibration acceleration sensor data acquisition module and the force sensor data acquisition module.
In the above scheme, the data processor comprises a data storage interface, a data acquisition controller and a data analysis module; the data storage interface is connected with the self-adaptive wired network interface of the wireless switch to realize data storage; the data acquisition controller is used for controlling a switch for data acquisition and can set different acquisition modes according to requirements; and the data analysis module analyzes, calculates and processes the acquired data to finally obtain measurement parameters required by the vibration characteristics of the rotating propeller shaft.
Correspondingly, the invention also provides a method for measuring the vibration characteristics of the rotary propulsion shaft, which comprises the following steps:
S1, installing a vibration acceleration sensor: a plurality of vibration acceleration sensors are arranged on the surface of the shaft body, the installation directions of the acceleration sensors are kept consistent, a certain distance is kept between the acceleration sensors and the vibration acceleration sensors are positioned on the same straight line, and the installation positions of the vibration acceleration sensors avoid the modal nodes of the propulsion shaft as much as possible;
S2, installing a vibration acceleration sensor data acquisition module: a vibration acceleration sensor data acquisition module is respectively arranged beside the corresponding vibration acceleration sensor on the surface of the shaft body, so that the sufficient electric quantity of the vibration acceleration sensor data acquisition module is ensured, a signal output transmitting antenna is opened, the vibration acceleration sensor and the vibration acceleration sensor data acquisition module are connected through a wire, and the wire is also required to be fixed on the surface of the shaft body to prevent the shaft body from shaking during rotation;
S3, installing a force sensor and an excitation device: the force sensor is arranged at the center of the loading end surface of the shafting, the loading device is always in a static state, the excitation device is arranged on a loading test platform of the loading end surface, and the axis of the excitation device and the force sensor are positioned on the same axis;
s4, installing a force sensor data acquisition module, a wireless switch and a data processor: the force sensor data acquisition module, the wireless exchanger and the data processor are arranged on the instrument test bed and are not contacted with the surface of the shaft body; the force sensor is connected with the force sensor data acquisition module by a wire; the data processor is connected with the wireless switch by adopting a network cable, and the force sensor is connected with the force sensor data acquisition module by adopting a wire;
S5, turning on a power switch of each data acquisition module, powering on a wireless switch power supply, turning on a data processor, debugging a measurement system, ensuring that the wireless switch can normally communicate with each data acquisition module to transmit data, and ensuring that the data processor can normally receive data and process the data;
S6, starting the operation working condition of the shafting, applying load to the force sensor by the vibration excitation device, respectively acquiring vibration response data and force signal data, and processing the calculation data by the data processor to obtain the vibration acceleration response, the natural frequency and the vibration mode of the rotary propulsion shaft.
The invention has the beneficial effects that:
1) The invention adopts a one-to-one data acquisition mode of the vibration acceleration sensor and the data acquisition module, the data acquisition module is internally provided with a battery for power supply, an external power supply is not needed, and the vibration acceleration sensor and the data acquisition module can be directly arranged on the rotary propulsion shaft, so that an integrated mode of the acceleration sensor and the data acquisition module is realized. Compared with a wireless remote sensing measurement system, the data acquisition interface is simple, and the problem of excessive interfaces caused by twice conversion of data acquisition signals is avoided.
2) The invention adopts a wireless network data transmission mode, the wireless AP module is embedded in the data acquisition module, the data transmission is realized through the wireless switch, the wireless switch can realize the data transmission with a plurality of data acquisition modules, and compared with a wireless remote sensing measurement system, the data transmission efficiency is high, the electromagnetic environment interference is avoided, and the measurement precision is higher.
3) Compared with a convolution induction measurement system, the ICP vibration acceleration sensor is used for acquiring the vibration parameters of the rotating propulsion shaft, not only can the displacement parameters of the shaft surface be acquired, but also the vibration acceleration in the time domain and the frequency response function between the force and the acceleration can be effectively measured, and further the vibration parameters such as the natural frequency, the vibration mode and the like can be acquired, so that the vibration characteristics of the rotating propulsion shaft can be comprehensively and accurately evaluated.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
Fig. 1 is a schematic diagram showing the system components of a rotary propeller shaft vibration characteristic measuring apparatus.
Fig. 2 is a schematic diagram of vibration acceleration sensor installation.
Fig. 3 is a schematic diagram of the installation of the vibration acceleration sensor data acquisition module.
Fig. 4 is a schematic diagram of connection between the data acquisition module and the vibration acceleration sensor.
Fig. 5 is a schematic view of a basic frame of a method for measuring vibration characteristics of a rotary propeller shaft.
Detailed Description
For a clearer understanding of technical features, objects and effects of the present invention, a detailed description of embodiments of the present invention will be made with reference to the accompanying drawings.
As shown in FIG. 1, the device for measuring the vibration characteristics of the rotating propeller shaft provided by the embodiment of the invention comprises a vibration acceleration sensor, a vibration acceleration sensor data acquisition module, a force sensor, an excitation device, a force sensor data acquisition module, a wireless switch and a data processor. Wherein:
The vibration acceleration sensor is a sensing element for the physical signal of the vibration parameter of the rotary propulsion shaft, and needs to be firmly and tightly connected with the surface of the shaft body. The vibration acceleration sensors are installed on the surface of the shaft body in a plurality, the installation directions of the vibration acceleration sensors are kept consistent, and the vibration acceleration sensors are spaced at a certain distance and are positioned on the same straight line. The direction keeping has the advantages of ensuring that the initial states of the vibration acceleration sensor are in the same phase, and a certain distance is needed for obtaining the vibration mode of the shaft body later. Preferably, referring to fig. 2, the vibration acceleration sensor is generally installed by connecting an installation base with an M5 stud with an M5 screw hole of the sensor, the installation base is fixed on the surface of the shaft body through a strong adhesive, and the natural frequency of the installation base should satisfy 2.5 times of the maximum measurement frequency of the vibration acceleration sensor, namely f n≥2.5fm.
And the vibration acceleration sensor data acquisition modules are respectively arranged on the surface of the shaft body and correspond to the axial sides of each vibration acceleration sensor, and the vibration acceleration sensors are connected with the vibration acceleration sensor data acquisition modules through wires. Preferably, referring to fig. 3, the vibration acceleration sensor data acquisition module is connected with the shaft body through the mounting base, the vibration acceleration sensor data acquisition module is in threaded connection with the mounting base, and the mounting base is in threaded connection with the shaft body. Referring to fig. 4, a wire connected between the vibration acceleration sensor and the vibration acceleration sensor data acquisition module is fixed on the surface of the shaft body to prevent the shaft body from shaking during rotation.
Specifically, the vibration acceleration sensor data acquisition module comprises 1 built-in power supply battery, 1 signal input acquisition port and 1 signal output transmitting antenna; the built-in power supply battery can provide 4mA and 24V direct current constant current sources for the self and ICP (INTEGRATED CIRCUITS PIEZOELECTRIC, built-in piezoelectric sensor) vibration acceleration sensor; the signal input acquisition port is connected with the signal output port of the vibration acceleration sensor to realize data acquisition; the signal output transmitting antenna adopts a wireless WIFI (wireless fidelity) and 2.4GHz transmitting frequency communication mode; the maximum sampling rate of the data acquisition module of the vibration acceleration sensor needs to be 2 times of the measurement frequency.
The force sensor and the exciting device are elements for inputting exciting force to the rotary propulsion shaft, the combination of the force sensor and the exciting device can be a force hammer or an exciting machine, the action point is positioned at the end loading device end of the propulsion shaft, the end loading device is used for simulating a propeller to apply thrust to the propulsion shaft, and the exciting force applied by the exciting device to the force sensor is required to meet the requirement that the vibration signal of the rotary propulsion shaft has enough signal to noise ratio. The force sensor is arranged at the center of the loading end face of the shafting, the excitation device is arranged on a loading test platform of the loading end face, and the axis of the excitation device and the force sensor are positioned on the same axis.
The force sensor data acquisition module, the wireless exchanger and the data processor are arranged on the instrument test bed and are not contacted with the surface of the shaft body; the force sensor is connected with the force sensor data acquisition module by a wire; the vibration acceleration sensor data acquisition module, the force sensor data acquisition module and the wireless switch adopt a wireless transmission mode to transmit signals, and the wireless switch and the data processor directly adopt a network cable to transmit signals.
Specifically, the force sensor data acquisition module comprises 1 built-in power supply battery, 1 signal input acquisition port and 1 signal output transmitting antenna; the built-in power supply battery provides 4mA and 24V direct current constant current source for the built-in power supply battery and the force sensor; the signal input acquisition port is connected with the signal output port of the force acceleration sensor to realize data acquisition; the signal output transmitting antenna adopts a wireless WIFI (wireless fidelity) and 2.4GHz transmitting frequency communication mode; the maximum sampling rate of the force sensor data acquisition module needs to be 2 times of the measurement frequency.
The wireless switch comprises 1 self-adaptive wired network interface, 1 2-3 GHz omnidirectional high-gain external antenna and 1 12-48V adaptive direct current power supply; the self-adaptive wired network interface is connected with the data processor through a network cable; the 2-3 GHz omnidirectional high-gain external antenna is used for receiving signals from the vibration acceleration sensor data acquisition module and the force sensor data acquisition module. The wireless communication characteristics of the wireless switch are matched with those of the data acquisition module.
The data processor comprises a data storage interface, a data acquisition controller and a data analysis module; the data storage interface is connected with the self-adaptive wired network interface of the wireless switch to realize the storage of data; the data acquisition controller is used for controlling a switch for data acquisition, and different acquisition modes can be set according to requirements; and the data analysis module analyzes, calculates and processes the acquired data to finally obtain the measurement parameters required by the vibration characteristics of the rotating propeller shaft.
Correspondingly, the invention also provides a method for measuring the vibration characteristics of the rotating propeller shaft, and the device for measuring the vibration characteristics of the rotating propeller shaft can realize the measurement of the vibration characteristic parameters by the method, and the flow of the measuring method is shown in fig. 5, and comprises the following steps:
S1, installing a vibration acceleration sensor: a plurality of vibration acceleration sensors are respectively arranged on the surface of a shaft body (in a static state), the contact surface of the shaft body is smooth, the installation base with an M5 stud is used for ensuring tight and firm connection with the shaft body, the acceleration sensors are connected with the installation base through bolts, the installation directions of the acceleration sensors are kept consistent, a certain distance is kept between the acceleration sensors and the acceleration sensors are positioned on the same straight line, and the installation position of the vibration acceleration sensors avoids the modal node of a propulsion shaft as much as possible. A schematic diagram of the vibration acceleration sensor installation is shown in fig. 3.
S2, installing a vibration acceleration sensor data acquisition module: the vibration acceleration sensor data acquisition modules are respectively arranged beside the corresponding vibration acceleration sensors on the surface of the shaft body (in a static state), the sufficient electric quantity of the vibration acceleration sensor data acquisition modules is ensured, the signal output transmitting antenna is opened, the data acquisition modules are tightly and firmly connected with the installation base through bolts, the installation base is bonded with the surface of the shaft body through adhesives, the vibration acceleration sensors and the vibration acceleration sensor data acquisition modules are connected through wires, and the wires are also fixed on the surface of the shaft body to prevent the shaft body from shaking due to rotation. The installation schematic diagram of the vibration acceleration sensor data acquisition module is shown in fig. 4, and the connection schematic diagram of the vibration acceleration sensor data acquisition module and the vibration acceleration sensor is shown in fig. 5.
S3, installing a force sensor and an excitation device: the force sensor is arranged at the center of the loading end surface of the shafting, the loading device is always in a static state, the excitation device is arranged on a loading test platform of the loading end surface, and the axis of the excitation device and the force sensor are positioned on the same axis;
s4, installing a force sensor data acquisition module, a wireless switch and a data processor: the force sensor data acquisition module, the wireless exchanger and the data processor are arranged on the instrument test bed and are not contacted with the surface of the shaft body; the force sensor is connected with the force sensor data acquisition module by a wire; the data processor is connected with the wireless switch by adopting a network cable, and the force sensor is connected with the force sensor data acquisition module by adopting a wire;
S5, turning on a power switch of each data acquisition module, powering on a wireless switch power supply, turning on a data processor, debugging a measurement system, ensuring that the wireless switch can normally communicate with each data acquisition module to transmit data, and ensuring that the data processor can normally receive data and process the data;
S6, starting the operation working condition of the shafting, applying load to the force sensor by the vibration excitation device, respectively acquiring vibration response data and force signal data, and processing the calculation data by the data processor to obtain the vibration acceleration response, the natural frequency and the vibration mode of the rotary propulsion shaft.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present invention and the scope of the claims, which are to be protected by the present invention.
Claims (7)
1. A method for measuring vibration characteristics of a rotary propeller shaft, comprising the steps of:
S1, installing a vibration acceleration sensor: a plurality of vibration acceleration sensors are arranged on the surface of the shaft body, the installation directions of the acceleration sensors are kept consistent, a certain distance is kept between the acceleration sensors and the vibration acceleration sensors are positioned on the same straight line, and the installation positions of the vibration acceleration sensors avoid the modal nodes of the propulsion shaft as much as possible;
S2, installing a vibration acceleration sensor data acquisition module: a vibration acceleration sensor data acquisition module is respectively arranged beside the corresponding vibration acceleration sensor on the surface of the shaft body, so that the sufficient electric quantity of the vibration acceleration sensor data acquisition module is ensured, a signal output transmitting antenna is opened, the vibration acceleration sensor and the vibration acceleration sensor data acquisition module are connected through a wire, and the wire is also required to be fixed on the surface of the shaft body to prevent the shaft body from shaking during rotation;
S3, installing a force sensor and an excitation device: the force sensor is arranged at the center of the loading end surface of the shafting, the loading device is always in a static state, the excitation device is arranged on a loading test platform of the loading end surface, and the axis of the excitation device and the force sensor are positioned on the same axis;
S4, installing a force sensor data acquisition module, a wireless switch and a data processor: the force sensor data acquisition module, the wireless exchanger and the data processor are arranged on the instrument test bed and are not contacted with the surface of the shaft body; the force sensor is connected with the force sensor data acquisition module by a wire; the vibration acceleration sensor data acquisition module, the force sensor data acquisition module and the wireless switch adopt a wireless transmission mode to transmit signals; the wireless exchanger is connected with the data processor by adopting a network cable;
S5, turning on a power switch of each data acquisition module, powering on a wireless switch power supply, turning on a data processor, debugging a measurement system, ensuring that the wireless switch can normally communicate with each data acquisition module to transmit data, and ensuring that the data processor can normally receive data and process the data;
S6, starting the operation working condition of the shafting, applying load to the force sensor by the vibration excitation device, respectively acquiring vibration response data and force signal data, and processing the calculation data by the data processor to obtain the vibration acceleration response, the natural frequency and the vibration mode of the rotary propulsion shaft.
2. The method for measuring vibration characteristics of a rotating propeller shaft according to claim 1, wherein the vibration acceleration sensor is connected with the shaft body through a mounting base, the vibration acceleration sensor is connected with the mounting base through threads, and the mounting base is bonded with the surface of the shaft body through glue; the natural frequency of the mounting base should meet 2.5 times of the maximum measurement frequency of the vibration acceleration sensor, namely f n≥2.5fm.
3. The method for measuring vibration characteristics of a rotating propeller shaft according to claim 1, wherein the vibration acceleration sensor data acquisition module is connected with the shaft body through a mounting base, the vibration acceleration sensor data acquisition module is connected with the mounting base through threads, and the mounting base is bonded with the surface of the shaft body through glue.
4. The method for measuring vibration characteristics of a rotating propeller shaft according to claim 1, wherein the vibration acceleration sensor data acquisition module includes a built-in power supply battery, a signal input acquisition port, and a signal output transmitting antenna; the built-in power supply battery supplies power for the built-in power supply battery and the vibration acceleration sensor; the signal input acquisition port is connected with the signal output port of the vibration acceleration sensor to realize data acquisition; the signal output transmitting antenna adopts a wireless WIFI (wireless fidelity) and 2.4GHz transmitting frequency communication mode; the maximum sampling rate of the data acquisition module of the vibration acceleration sensor needs to be 2 times of the measurement frequency.
5. The method for measuring vibration characteristics of a rotating propeller shaft according to claim 1, wherein the force sensor data acquisition module comprises a built-in power supply battery, a signal input acquisition port and a signal output transmitting antenna; the built-in power supply battery supplies power for the built-in power supply battery and the force sensor; the signal input acquisition port is connected with the signal output port of the force acceleration sensor to realize data acquisition; the signal output transmitting antenna adopts a wireless WIFI (wireless fidelity) and 2-3 GHz transmitting frequency communication mode; the maximum sampling rate of the force sensor data acquisition module needs to be 2 times of the measurement frequency.
6. The method for measuring vibration characteristics of a rotating propeller shaft according to claim 1, wherein the wireless switch comprises an adaptive wired network interface, a 2-3 GHz omnidirectional high-gain external antenna, and an adaptive direct current power supply of 12-48V; the self-adaptive wired network interface is connected with the data processor through a network cable; the 2-3 GHz omnidirectional high-gain external antenna is used for receiving signals from the vibration acceleration sensor data acquisition module and the force sensor data acquisition module.
7. The method for measuring vibration characteristics of a rotating propeller shaft of claim 6, wherein the data processor comprises a data storage interface, a data acquisition controller, a data analysis module; the data storage interface is connected with the self-adaptive wired network interface of the wireless switch to realize data storage; the data acquisition controller is used for controlling a switch for data acquisition and can set different acquisition modes according to requirements; and the data analysis module analyzes, calculates and processes the acquired data to finally obtain measurement parameters required by the vibration characteristics of the rotating propeller shaft.
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