CN104670510B - A kind of lifting airscrew rotating speed alarm device - Google Patents
A kind of lifting airscrew rotating speed alarm device Download PDFInfo
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- CN104670510B CN104670510B CN201310629012.6A CN201310629012A CN104670510B CN 104670510 B CN104670510 B CN 104670510B CN 201310629012 A CN201310629012 A CN 201310629012A CN 104670510 B CN104670510 B CN 104670510B
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Abstract
The invention belongs to automatic control technology, it is related to a kind of lifting airscrew rotating speed alarm device.A kind of lifting airscrew rotating speed alarm device, it is characterized in that, including Signal-regulated kinase（1）, Shaping Module（2）, amplitude sampling module（3）, frequency measuring block（4）, output driving module（5）, MCU management and configuration module（6）, AGC control circuit（7）；The present invention still has preferable precision when rotor rotating speed is relatively low when that is, signal to noise ratio is smaller.It can stablize output rotor maximum or minimum speed alarm in criterion point.
Description
Technical field
The invention belongs to automatic control technology, it is related to a kind of lifting airscrew rotating speed alarm device.
Background technology
The minimum and maximum rotating speed warning system of lifting airscrew be used in helicopter when rotor rotating speed above or below
When allowing working range, " excess revolutions " or " low turn " warning are sent to pilot.Pilot takes appropriate measures, and keeps rotor to turn
Speed is to stable state.
The content of the invention
The purpose of the present invention is：Propose that one kind can realize the minimum and maximum alarm device of lifting airscrew rotating speed, to protect
Demonstrate,prove helicopter flight safety.
The technical scheme is that：A kind of lifting airscrew rotating speed alarm device, including Signal-regulated kinase 1, shaping
Module 2, amplitude sampling module 3, frequency measuring block 4, output driving module 5, MCU management and configuration module 6, AGC control electricity
Road 7.
The frequency of lifting airscrew speed probe output is directly proportional sinusoidal ac signal to rotating speed, through Signal-regulated kinase
1 filters out differential mode and common-mode noise, while exporting to Shaping Module 2 and amplitude sampling module 3；
Shaping Module 2 translates the signals into square-wave signal, and frequency measuring block 4 is measured to the frequency of square wave, passed through
Bus sends measurement result to MCU management and configuration module 6；
Amplitude sampling module 3 enters to signal after line amplitude sampling, and amplitude sampling result is exported to MCU and managed with configuring mould
Block 6, MCU management judges whether signal amplitude is less than threshold value with configuration module 6：
If less than threshold value, the measurement result of frequency measuring block 4, MCU pipes are abandoned in MCU management with configuration module 6 first
Reason controls AGC to control circuit 7 to be amplified processing to signal according to amplitude sampling result again with configuration module 6, meanwhile, MCU pipes
Reason is carried out after FFT FFT with configuration module 6 to amplitude sampling result, directly obtains the frequency of signal, and should
Frequency is compared with frequency criterion point, then by output driving module 5 to pilot send " excess revolutions " or " low turn " warning；
If greater than threshold value, MCU management and the measurement result of the direct frequency of use measurement module 4 of configuration module 6 obtain letter
Number frequency, and the frequency is compared with frequency criterion point, then sent " excess revolutions " to pilot by output driving module 5
Or " low turn " warning, MCU management and configuration module 6 no longer control AGC to control circuit 7 to be carried out according to amplitude sampling result to signal
Enhanced processing.
It is an advantage of the invention that：The present invention still has preferable precision when rotor rotating speed is relatively low when that is, signal to noise ratio is smaller.
It can stablize output rotor maximum or minimum speed alarm in criterion point.
Brief description of the drawings
Fig. 1 is the circuit diagram of the present invention.
Embodiment
According to the operation principle of sensor, tach signal is eventually exhibited as the inspection of a changes in amplitude and frequency variation signal
Survey process, with capturing unit detection square wave frequency and then to do digital filtering precision again very high, but when rotating speed is relatively low due to noise
Smaller, capture acquisition precision has declined, and the average treatment delay of this method is inversely proportional with signal frequency, and frequency is got over
Low delay is bigger, i.e., the slow-speed of revolution when be delayed it is larger.And FFT frequency acquisitions still have a preferable precision in signal to noise ratio hour, therefore
Signal frequency is detected using acquisition mode during high rotating speed, signal frequency is detected using FFT FFT modes during the slow-speed of revolution
Rate.
A kind of lifting airscrew rotating speed alarm device, including Signal-regulated kinase 1, Shaping Module 2, amplitude sampling module 3,
Frequency measuring block 4, output driving module 5, MCU management and configuration module 6, AGC control circuits 7.
Because lifting airscrew speed probe is arranged near main hub, the vibration in flight course can be to sensor
Output produces differential mode and common-mode noise, it is necessary to be filtered processing to sensor output, it is to avoid noise produces the processing knot of mistake
Really.The frequency of lifting airscrew speed probe output is directly proportional sinusoidal ac signal to rotating speed, is filtered out through Signal-regulated kinase 1
Differential mode and common-mode noise, while exporting to Shaping Module 2 and amplitude sampling module 3；
Shaping Module 2 translates the signals into square-wave signal, and frequency measuring block 4 is measured to the frequency of square wave, passed through
Bus sends measurement result to MCU management and configuration module 6；
Amplitude sampling module 3 enters to signal after line amplitude sampling, and amplitude sampling result is exported to MCU and managed with configuring mould
Block 6, MCU management judges whether signal amplitude is less than threshold value with configuration module 6：Threshold value determines by the characteristic of lifting airscrew, no
With lifting airscrew exist it is different must be by selection range.
Because noise is than larger when rotor rotating speed is low to be turned, noise easily influences result.If less than threshold value, MCU management
Abandon the measurement result of frequency measuring block 4 first with configuration module 6, MCU management controls AGC control electricity again with configuration module 6
Road 7 is amplified processing to signal according to amplitude sampling result, meanwhile, MCU management is entered with configuration module 6 to amplitude sampling result
After row FFT FFT, the frequency of signal is directly obtained, and the frequency is compared with frequency criterion point, then is led to
Cross output driving module 5 and send " excess revolutions " or " low turn " warning to pilot；
Signal is more stable when turning due to rotor rotating speed height, and noise is difficult to influence result.If greater than threshold value, rotor
Rotating speed is higher, takes reference clock as reference, frequency measuring block 4 measures quilt by the cycle count based on reference signal
Survey the signal period, it is preferred that emphasis is the startup of counting with it is synchronous, frequency measuring block 4 provides preset gate opening signal, still
This hour counter is not started counting up, but the arrival of the rising edge when measured signal, produces the reality synchronous with measured signal
The counting to frequency is just opened during the signal strobe of border.When preset signal strobe is closed, counter does not also stop counting immediately,
But just really terminate to count completion one-shot measurements at the time of the rising edge of measured signal arrives.Actual gate time
It has been not equal to preset gate time, but difference is no more than a cycle of measured signal.The measurement of this measuring method is relative
Frequency of the size of error in theory with measured signal is unrelated, is only determined by the frequency and gate opening time of frequency standard signal.
The frequency of frequency standard signal is higher, and gate time more long then relative error is just smaller.MCU is managed with configuration module 6 directly using frequency
The measurement result of rate measurement module 4 obtains the frequency of signal, and the frequency is compared with frequency criterion point, then passes through output
Drive module 5 sends " excess revolutions " or " low turn " warning to pilot, and MCU management no longer controls AGC to control circuit with configuration module 6
7 are amplified processing to signal according to amplitude sampling result.
MCU is managed selects digital signal processor with configuration module.
Signal-regulated kinase selects differential mode and common-mode filter.
Shaping Module selects comparator.
Frequency measuring block selects PLD.
Amplitude sampling module selects the A/D modular converters that digital signal processor is carried.
Claims (6)
1. a kind of lifting airscrew rotating speed alarm device, it is characterized in that, including Signal-regulated kinase (1), Shaping Module (2), width
Spend sampling module (3), frequency measuring block (4), output driving module (5), MCU management and configuration module (6), AGC control electricity
Road (7)；
The frequency of lifting airscrew speed probe output is directly proportional sinusoidal ac signal to rotating speed, through Signal-regulated kinase (1)
Differential mode and common-mode noise are filtered out, while exporting to Shaping Module (2) and amplitude sampling module (3)；
Shaping Module (2) translates the signals into square-wave signal, and frequency measuring block (4) is measured to the frequency of square wave, passed through
Bus sends measurement result to MCU management and configuration module (6)；
Amplitude sampling module (3) enters to signal after line amplitude sampling, and amplitude sampling result is exported to MCU management and configuration module
(6), MCU management judges whether signal amplitude is less than threshold value with configuration module (6)：
If less than threshold value, the measurement result of frequency measuring block (4), MCU pipes are abandoned in MCU management with configuration module (6) first
Reason controls AGC to control circuit (7) to be amplified processing to signal according to amplitude sampling result again with configuration module (6), meanwhile,
MCU is managed to be carried out after FFT FFT with configuration module (6) to amplitude sampling result, directly obtains the frequency of signal,
And be compared the frequency with frequency criterion point, then to pilot send " excess revolutions " or " low by output driving module (5)
Turn " warning；
If greater than threshold value, MCU management and the measurement result of configuration module (6) directly frequency of use measurement module (4) obtain letter
Number frequency, and the frequency is compared with frequency criterion point, then to pilot send " super by output driving module (5)
Turn " or " low turn " warning, MCU management and configuration module (6) no longer control AGC to control circuit (7) according to amplitude sampling result pair
Signal is amplified processing.
2. a kind of lifting airscrew rotating speed alarm device as claimed in claim 1, it is characterized in that, MCU management and configuration module
From digital signal processor.
3. a kind of lifting airscrew rotating speed alarm device as claimed in claim 1, it is characterized in that, Signal-regulated kinase is from poor
Mould and common-mode filter.
4. a kind of lifting airscrew rotating speed alarm device as claimed in claim 1, it is characterized in that, Shaping Module, which is selected, to be compared
Device.
5. a kind of lifting airscrew rotating speed alarm device as claimed in claim 1, it is characterized in that, frequency measuring block is selected can
Programmed logic device.
6. a kind of lifting airscrew rotating speed alarm device as claimed in claim 1, it is characterized in that, amplitude sampling module selects number
The A/D modular converters that word signal processor is carried.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310629012.6A CN104670510B (en) | 2013-12-02 | 2013-12-02 | A kind of lifting airscrew rotating speed alarm device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310629012.6A CN104670510B (en) | 2013-12-02 | 2013-12-02 | A kind of lifting airscrew rotating speed alarm device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104670510A CN104670510A (en) | 2015-06-03 |
| CN104670510B true CN104670510B (en) | 2017-07-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310629012.6A Active CN104670510B (en) | 2013-12-02 | 2013-12-02 | A kind of lifting airscrew rotating speed alarm device |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10802482B2 (en) * | 2017-02-27 | 2020-10-13 | Textron Innovations Inc. | Reverse tactile cue for rotorcraft rotor overspeed protection |
| CN113049878A (en) * | 2021-03-04 | 2021-06-29 | 中国科学院微小卫星创新研究院 | Satellite frequency measurement system and method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5170365A (en) * | 1985-12-12 | 1992-12-08 | General Electric Company | Propeller speed and phase sensor |
| CN2682419Y (en) * | 2003-01-10 | 2005-03-02 | 东方电机控制设备有限公司 | Electrical rotational speed signal device |
| CN101879942A (en) * | 2010-06-25 | 2010-11-10 | 北京航空航天大学 | Helicopter rotor wing automatic clutch control system with safety protection function |
| CN202414172U (en) * | 2011-11-04 | 2012-09-05 | 上海第二工业大学 | Helicopter failure warning system |
| CN102963533A (en) * | 2012-12-14 | 2013-03-13 | 中国航空工业集团公司上海航空测控技术研究所 | Helicopter health and usage monitoring system (HUMS) and method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1873573A (en) * | 2005-05-31 | 2006-12-06 | 上海自动化仪表股份有限公司 | Card for tachometry, distributed control system and measuring method |
-
2013
- 2013-12-02 CN CN201310629012.6A patent/CN104670510B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5170365A (en) * | 1985-12-12 | 1992-12-08 | General Electric Company | Propeller speed and phase sensor |
| CN2682419Y (en) * | 2003-01-10 | 2005-03-02 | 东方电机控制设备有限公司 | Electrical rotational speed signal device |
| CN101879942A (en) * | 2010-06-25 | 2010-11-10 | 北京航空航天大学 | Helicopter rotor wing automatic clutch control system with safety protection function |
| CN202414172U (en) * | 2011-11-04 | 2012-09-05 | 上海第二工业大学 | Helicopter failure warning system |
| CN102963533A (en) * | 2012-12-14 | 2013-03-13 | 中国航空工业集团公司上海航空测控技术研究所 | Helicopter health and usage monitoring system (HUMS) and method thereof |
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| CN104670510A (en) | 2015-06-03 |
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