CN101509930A - Torsional vibration rotating velocity measuring apparatus and method - Google Patents
Torsional vibration rotating velocity measuring apparatus and method Download PDFInfo
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- CN101509930A CN101509930A CNA200910001119XA CN200910001119A CN101509930A CN 101509930 A CN101509930 A CN 101509930A CN A200910001119X A CNA200910001119X A CN A200910001119XA CN 200910001119 A CN200910001119 A CN 200910001119A CN 101509930 A CN101509930 A CN 101509930A
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Abstract
The invention relates to torsion oscillation rotating speed measuring equipment and method. The torsion oscillation rotating speed measuring equipment comprises a gear speed-measuring probe, a blocking pressure-partitioning filtering module and an amplifying shaping module; wherein, the amplifying shaping module outputting standard pulse signal is connected with a torsion oscillation processing module by a photoelectric isolation module, the torsion oscillation processing module comprises a phase-locked loop N frequency multiplication unit which improves the frequency of the standard pulse signal by N times and outputs high-frequency pulse signal and a torsion oscillation processing unit which obtains torsion oscillation rotating speed according to the high-frequency pulse signal. The invention carries out high-multiple uniform frequency multiplication to the standard pulse signal by the phase-locked loop N frequency multiplication unit, and improves the frequency of the standard pulse signal by hundreds of to thousands of times, thus not only being capable of measuring the torsion oscillation rotating speed of a plurality of frequencies, but also having high measuring accuracy, being directly used for high-precise measurement of macro-axis torsion oscillation, and having wide application prospect.
Description
Technical field
The present invention relates to a kind of rotation-speed measuring device and method, particularly a kind of torsional vibration rotating velocity measuring apparatus and method.
Background technology
At present, measure speed gears is normally installed in the tachometric survey of prior art on macro-axis, by collection, counting and the calculating of measurement mechanism, finally obtains the rotating speed of macro-axis.The prior art rotation-speed measuring device comprises the gear holes probe, every straight dividing potential drop filtration module, amplify Shaping Module, counter module, timer module and display module, when macro-axis rotates, gear holes probe output speed signal (similar sine wave or square wave), this tach signal is through carrying out DC-isolation every straight dividing potential drop filtration module and amplification Shaping Module, dividing potential drop, filtering, after amplification and the shaping, obtain the full sized pules signal, by the timer module setting data sampling period, counter module carries out periodically counting the frequency that promptly can calculate the full sized pules signal to the full sized pules signal, according to the number of teeth of this frequency and measure speed gears, can calculate macro-axis at the mean speed of each data sampling in the cycle.
The measure speed gears of supposing to be installed on the macro-axis has M tooth (being that the number of teeth is M tooth/commentaries on classics) weekly, umber of pulse at data sampling period T internal standard second pulse signal is S, then the frequency f i of tach signal is: fi=S/T (Hz), then macro-axis the mean speed of data sampling period T in second be S/T/M=fi/M (revolutions per second).
When the number of teeth of measure speed gears was abundant, the prior art rotation-speed measuring device can guarantee the measuring accuracy of rotating speed, but when being used to measure the torsional oscillation of macro-axis or waving (minor fluctuations), the measuring accuracy of prior art rotation-speed measuring device then can't meet the demands.
For example, the number of teeth of supposing measure speed gears is 60 tooth/commentaries on classics, and the macro-axis rotating speed is 50 revolutions per seconds, and sample frequency is got 100Hz, and promptly the data sampling cycle got 0.01 second.When adopting the prior art rotation-speed measuring device to measure, the count value of each data sampling cycle inside counting device module is 50 revolutions per seconds * 60 tooth/commentaries on classics * 0.01 second=30 teeth, measuring the possible error of hour counter module is ± 1 tooth, so measuring relative errors is about ± 1/30=± 3.3%.In fact, torsional oscillation or the frequency of waving are generally about 30Hz, and amplitude is about 1%, and therefore, the measuring accuracy when measuring the torsional oscillation below 1% or waving of the measuring relative errors about prior art ± 3.3% is poor, even can't identification.
Though prior art can improve measuring accuracy by the method that increases the measure speed gears number of teeth, this way is not only very bothersome, and the thousands of times of ground increase measure speed gears numbers of teeth also are difficult to realize.
Summary of the invention
The purpose of this invention is to provide a kind of torsional vibration rotating velocity measuring apparatus and method, not only can measure the torsional oscillation rotating speed of a plurality of frequencies, and the measuring accuracy height.
To achieve these goals, the invention provides a kind of torsional vibration rotating velocity measuring apparatus, comprise successively the gear holes probe that connects, every straight dividing potential drop filtration module with amplify Shaping Module, the amplification Shaping Module of outputting standard pulse signal is connected with the torsional oscillation processing module, and described torsional oscillation processing module comprises the frequency of described full sized pules signal is improved N doubly and export the phaselocked loop N frequency multiplication unit of high-frequency pulse signal and obtain the torsional oscillation processing unit of torsional oscillation rotating speed according to described high-frequency pulse signal.
Described torsional oscillation processing module also comprises the optical transmission unit that is arranged between described phaselocked loop N frequency multiplication unit and the torsional oscillation processing unit, and described optical transmission unit comprises electrooptic switching element, Optical Fiber Transmission unit and the photoelectric conversion unit that connects successively.
Described torsional oscillation processing unit comprises DSP unit, interface unit and the computing unit that connects successively.Further, described DSP unit comprises step-by-step counting unit, revolution speed calculating unit and the fluctuation rotating speed unit that connects successively, and described step-by-step counting unit also is connected with timing unit, and described fluctuation rotating speed unit also is connected with bandpass filtering unit or fft processing unit.
Also be provided with between described amplification Shaping Module and the torsional oscillation processing module by electrical isolation to improve the photoelectric isolation module of interference free performance.
Described torsional oscillation processing unit comprises successively amplifying unit, low-pass filter unit, feature noise jamming unit and the bandpass filtering unit that connects, and the output terminal of the low-pass filter unit in described amplifying unit and the phaselocked loop N frequency multiplication unit is connected.
On the technique scheme basis, described phaselocked loop N frequency multiplication unit comprises phase demodulation unit, low-pass filter unit, VCO unit and N times of frequency unit, an input end of described phase demodulation unit is connected with photoelectric isolation module, another input end is connected with the output terminal of N times of frequency unit, low-pass filter unit is connected with the output terminal of phase demodulation unit, the VCO unit is connected with low-pass filter unit, the input end of N times of frequency unit is connected with the VCO unit, and output terminal is connected with another input end of phase demodulation unit.Further, the frequency multiplication multiple N in the described N times frequency unit is 1500～8000.
To achieve these goals, the present invention also provides a kind of torsional vibration rotating velocity measuring method, comprising:
Described step 4 comprises:
The invention provides a kind of torsional vibration rotating velocity measuring apparatus and method, carry out DC-isolation, dividing potential drop, filtering, amplification and shaping processing by tach signal and obtain the full sized pules signal the output of gear holes probe, and isolate by photoelectricity and to be input in the torsional oscillation processing module, improve the antijamming capability of device, and ensured measuring accuracy.The present invention carries out evenly frequency multiplication of high multiple ground by phaselocked loop N frequency multiplication unit to the full sized pules signal, hundreds of frequencies that improve the full sized pules signal to number thousandfold, become the high-frequency pulse signal of number MHz even tens of MHz as the full sized pules conversion of signals that will count kHz, so improved measuring accuracy.The present invention obtains mean speed by high-frequency pulse signal being counted handle, obtain the fluctuation rotating speed by mean speed, obtain torsional oscillation rotating speed frequency spectrum or torsional oscillation rotating speed by the fluctuation rotating speed at last, not only can measure the torsional oscillation rotating speed of a plurality of frequencies, and the measuring accuracy height, make on the macro-axis the faint torsional oscillation between shaft part or the faint accurate measurement of waving of rotor become possibility.Torsional vibration rotating velocity measuring apparatus of the present invention can be directly used in the high-acruracy survey of big axial torsional vibration (or waving), has broad application prospects.
Description of drawings
Fig. 1 is the structural representation of torsional vibration rotating velocity measuring apparatus first embodiment of the present invention;
Fig. 2 exports the structural representation of the DSP unit of torsional oscillation rotating speed for adopting the bandpass filtering mode in the first embodiment of the invention;
Fig. 3 is the structural representation that adopts the DSP unit of FFT mapping mode output torsional oscillation rotating speed frequency spectrum in the first embodiment of the invention;
Fig. 4 adopts FFT conversion obtain the fluctuating spectrum curve of rotating speed for first embodiment of the invention;
Fig. 5 adopts FFT conversion obtain the fluctuating time dependent synoptic diagram of spectrum curve of rotating speed for first embodiment of the invention;
Fig. 6 is the structural representation of torsional vibration rotating velocity measuring apparatus second embodiment of the present invention;
Fig. 7 is the structural representation of torsional vibration rotating velocity measuring apparatus the 3rd embodiment of the present invention;
Fig. 8 a, Fig. 8 b and Fig. 8 c are that third embodiment of the invention adopts the bandpass filtering mode to obtain the torsional oscillation speed waveform synoptic diagram of three different frequencies;
Fig. 9 is concrete circuit diagram of implementing of torsional vibration rotating velocity measuring apparatus of the present invention;
Figure 10 is another concrete circuit diagram of implementing of torsional vibration rotating velocity measuring apparatus of the present invention;
Figure 11 is the process flow diagram of torsional vibration rotating velocity measuring method of the present invention;
Figure 12 is for obtaining the process flow diagram of torsional oscillation rotating speed in the torsional vibration rotating velocity measuring method of the present invention.
Description of reference numerals:
1-gear holes probe; 2-every straight dividing potential drop filtration module; 3-amplification Shaping Module;
4-photoelectric isolation module; 5-phaselocked loop N frequency multiplication unit; 6-optical transmission unit;
7-torsional oscillation processing unit; 8-amplifying unit; 9-low-pass filter unit;
10-feature noise jamming unit; 11-bandpass filtering unit; 51-phase demodulation unit;
52-low-pass filter unit; 53-VCO unit; 54-N times of frequency unit;
71-DSP unit; 72-interface unit; 73-computing unit;
710-timing unit; 711-step-by-step counting unit; 712-revolution speed calculating unit;
713-fluctuation rotating speed unit; 714-bandpass filtering unit; 715-fft processing unit.
Embodiment
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Fig. 1 is the structural representation of torsional vibration rotating velocity measuring apparatus first embodiment of the present invention.As shown in Figure 1, the present embodiment torsional vibration rotating velocity measuring apparatus comprise successively the gear holes probe 1 that connects, every straight dividing potential drop filtration module 2, amplify Shaping Module 3, photoelectric isolation module 4 and torsional oscillation processing module.Gear holes probe 1 is arranged on a side of measure speed gears, when macro-axis rotates, and gear holes probe 1 output speed signal (similar sine wave or square wave); Be connected with gear holes probe 1 every straight dividing potential drop filtration module 2, be used to receive tach signal and tach signal is carried out DC-isolation, dividing potential drop and Filtering Processing; Amplify Shaping Module 3 and be connected, be used for tach signal is amplified and the shaping processing, obtain the full sized pules signal every straight dividing potential drop filtration module 2; Photoelectric isolation module 4 with amplify Shaping Module 3 and be connected, be used for electrical isolation between rotating speed detection circuit and the signal processing circuit with the interference free performance of raising device; The torsional oscillation processing module is connected with photoelectric isolation module 4, is used for receiving through the full sized pules signal of isolating and handling from photoelectric isolation module 4, obtains torsional oscillation rotating speed or torsional oscillation rotating speed frequency spectrum.In the present embodiment, the torsional oscillation processing module comprises phaselocked loop N frequency multiplication unit 5 and torsional oscillation processing unit 7, phaselocked loop N frequency multiplication unit 5 is connected with photoelectric isolation module 4, be used for receiving the full sized pules signal of process electrical isolation from photoelectric isolation module 4, and the frequency of full sized pules signal strictly improved N doubly, obtain high-frequency pulse signal; Torsional oscillation processing unit 7 is connected with phaselocked loop N frequency multiplication unit 5, is used for the 5 reception high-frequency pulse signals from phaselocked loop N frequency multiplication unit, and obtains torsional oscillation rotating speed or torsional oscillation rotating speed frequency spectrum by the processing to high-frequency pulse signal.
In the above-mentioned technical solutions of this embodiment, phaselocked loop N frequency multiplication unit 5 comprises phase demodulation unit 51, low-pass filter unit 52, VCO unit 53 and N times of frequency unit 54, wherein phase demodulation unit 51 input end is connected with photoelectric isolation module 4, another input end is connected with the output terminal of N times of frequency unit 54, be used for standard of comparison pulse signal fi and high-frequency pulse signal Nfi phase place, and phase differential be converted to the voltage signal V of 0～Vcc through the signal behind N times of frequency division; Low-pass filter unit 52 is connected with the output terminal of phase demodulation unit 51, is used to receive the voltage signal V of phase demodulation unit 51 outputs, and carries out Filtering Processing, the high frequency noise among the filtering voltage signal V; VCO unit 53 is connected with low-pass filter unit 52, is used to receive through the voltage signal V after low-pass filter unit 52 Filtering Processing, and the high-frequency pulse signal Nfi that is directly proportional with voltage signal V of output frequency; The input end of N times of frequency unit 54 is connected with the output terminal of VCO unit 53, be used to receive high-frequency pulse signal, and carry out the signal that N times of frequency division handled the full sized pules signal fi same frequency that obtains and import and can be compared phase place through 53 outputs of VCO unit; The output terminal of N times of frequency unit 54 is connected with another input end of phase demodulation unit 51, forms closed-loop control.Through after the above-mentioned closed-loop control, select just can guarantee the frequency of full sized pules signal is strictly improved N times when suitable when parameter, reach the effect of frequency multiplication.
In the above-mentioned technical solutions of this embodiment, torsional oscillation processing unit 7 comprises DSP unit 71, interface unit 72 and the computing unit 73 that connects successively, wherein the output terminal of the VCO unit 53 in DSP unit 71 and the phaselocked loop N frequency multiplication unit 5 is connected, be used to receive high-frequency pulse signal, and high-frequency pulse signal handled, obtain torsional oscillation rotating speed or torsional oscillation rotating speed frequency spectrum; Interface unit 72 is connected with DSP unit 71, and computing unit 73 is connected with interface unit 72, and interface unit 72 is as the communication interface between DSP unit 71 and the computing unit 73, to realize data communication and the transmission between computing unit 73 and the DSP unit 71.In the practical application, interface unit can be serial ports or network interface device, and computing unit can be a computing machine.
Fig. 2 exports the structural representation of the DSP unit of torsional oscillation rotating speed for adopting the bandpass filtering mode in the first embodiment of the invention.As shown in Figure 2, present embodiment DSP unit comprises step-by-step counting unit 711, revolution speed calculating unit 712, fluctuation rotating speed unit 713 and the bandpass filtering unit 714 that connects successively, and step-by-step counting unit 711 also is connected with timing unit 710.Timing unit 710 is used for the setting data sampling period and the data sampling clock is provided; The output terminal of the VCO unit 53 in step-by-step counting unit 711 and the phaselocked loop N frequency multiplication unit 5 is connected, and is used to receive high-frequency pulse signal, and high-frequency pulse signal is carried out the periodicity counting, obtains count value; Revolution speed calculating unit 712 is used for the 711 count pick up values from the step-by-step counting unit, and count value handling is become the mean speed of data sampling in the cycle; Fluctuation rotating speed unit 713 is used for the 712 reception mean speeds from the revolution speed calculating unit, and calculates the fluctuation rotating speed (speed discrepancy) between mean speed and the rated speed; Bandpass filtering unit 714 is a plurality of bandpass filter, is used for receiving the fluctuation rotating speeds from fluctuation rotating speed unit 713, by a plurality of bandpass filter the fluctuation rotating speed is carried out the bandpass filtering of different frequency bands, obtains the torsional oscillation rotating speed of different frequency.
Fig. 3 is the structural representation that adopts the DSP unit of FFT mapping mode output torsional oscillation rotating speed frequency spectrum in the first embodiment of the invention.As shown in Figure 3, present embodiment DSP unit comprises step-by-step counting unit 711, revolution speed calculating unit 712, fluctuation rotating speed unit 713 and the fft processing unit 715 that connects successively, and step-by-step counting unit 711 also is connected with timing unit 710.Timing unit 710 is used for the setting data sampling period and the data sampling clock is provided; The output terminal of the VCO unit 53 in step-by-step counting unit 711 and the phaselocked loop N frequency multiplication unit 5 is connected, and is used to receive high-frequency pulse signal, and high-frequency pulse signal is carried out the periodicity counting, obtains count value; Revolution speed calculating unit 712 is used for the 711 count pick up values from the step-by-step counting unit, and count value handling is become mean speed; Fluctuation rotating speed unit 713 is used for the 712 reception mean speeds from the revolution speed calculating unit, and calculates the fluctuation rotating speed between mean speed and the rated speed; Fft processing unit 715 is used for receiving the fluctuation rotating speed from fluctuation rotating speed unit 713, obtains torsional oscillation rotating speed frequency spectrum by the FFT conversion.
Fig. 4 adopts FFT conversion obtain the fluctuating spectrum curve of rotating speed for first embodiment of the invention.As shown in Figure 4, (the torsional oscillation rotating speed is with respect to the variable quantity of rated speed with the fluctuation rotating speed in one section sampled data sample, unit is ‰) carry out the spectrum curve that obtains behind the fast Fourier transform (FFT), by curve as seen, fluctuation not only comprises the component of 50Hz in the rotating speed, also includes the torsional oscillation rotating speed of 13.1Hz, 25.0Hz and 29.4Hz.Fig. 5 adopts FFT conversion obtain the fluctuating time dependent synoptic diagram of spectrum curve of rotating speed for first embodiment of the invention.As shown in Figure 5, three torsional oscillation rotating speeds increase when beginning quickly, progressively decay behind peaking.
Fig. 6 is the structural representation of torsional vibration rotating velocity measuring apparatus second embodiment of the present invention.As shown in Figure 6, present embodiment is a kind of expansion structure, on the aforementioned first embodiment technical scheme basis, present embodiment torsional oscillation processing module also comprises optical transmission unit 6, optical transmission unit 6 is arranged between phaselocked loop N frequency multiplication unit 5 and the torsional oscillation processing unit 7, is used for tach signal is transmitted at a distance by optical fiber.In the present embodiment, optical transmission unit 6 comprises electrooptic switching element, Optical Fiber Transmission unit and the photoelectric conversion unit that connects successively, the output terminal of the VCO unit 53 in electrooptic switching element and the phaselocked loop N frequency multiplication unit 5 is connected, and photoelectric conversion unit is connected with the DSP unit 71 of torsional oscillation processing unit 7.
Fig. 7 is the structural representation of torsional vibration rotating velocity measuring apparatus the 3rd embodiment of the present invention.As shown in Figure 7, the present embodiment torsional vibration rotating velocity measuring apparatus comprise successively the gear holes probe 1 that connects, every straight dividing potential drop filtration module 2, amplify Shaping Module 3, photoelectric isolation module 4 and torsional oscillation processing module.Its middle gear holes probe 1, identical with effect with aforementioned first embodiment every the annexation of straight dividing potential drop filtration module 2, amplification Shaping Module 3 and photoelectric isolation module 4, the torsional oscillation processing module is connected with photoelectric isolation module 4, be used for receiving through the full sized pules signal of isolating anti-interference process and handling, obtain the torsional oscillation rotating speed from photoelectric isolation module 4.In the present embodiment, the torsional oscillation processing module comprises phaselocked loop N frequency multiplication unit 5, amplifying unit 8, low-pass filter unit 9, feature noise jamming unit 10 and the bandpass filtering unit 11 that connects successively.Wherein, phaselocked loop N frequency multiplication unit comprises phase demodulation unit 51, low-pass filter unit 52, VCO unit 53 and N times of frequency unit 54, and structure is identical with aforementioned first embodiment; The output terminal (or input end of VCO unit 53) of the low-pass filter unit 52 in amplifying unit 8 and the phaselocked loop N frequency multiplication unit 5 through buffer compartment from after be connected, the output signal (the perhaps input signal of VCO unit) of low-pass filter unit 52 is obtained the simulating signal of change in voltage after straight amplification, behind this simulating signal process low-pass filter unit 9 and the feature noise jamming unit 10, send into bandpass filtering unit 11.In the present embodiment, bandpass filtering unit 11 is a plurality of bandpass filter, is used to receive the simulating signal of change in voltage, carries out the bandpass filtering of different frequency bands by a plurality of bandpass filter, obtains the torsional oscillation rotating speed of different frequency.
Fig. 8 a, Fig. 8 b and Fig. 8 c are that third embodiment of the invention adopts the bandpass filtering mode to obtain the waveform synoptic diagram of the torsional oscillation rotating speed of three different frequencies.These three torsional oscillation rotating speeds change curve in time are that to adopt centre frequency respectively be result after the band-pass filter of 13.1Hz, 25.0Hz and 29.4Hz.
In the above embodiment of the present invention, the characteristics of measuring-signal and requirement as required, choose reasonable tach signal frequency multiplication multiple and data sampling cycle are to obtain best measuring accuracy.In order to adapt to the needs of different measuring occasion, the frequency multiplication multiple N of phaselocked loop N frequency multiplication unit is arranged to adjust or to change, preferably, frequency multiplication multiple N can get 1500～8000, the frequency of the high-frequency pulse signal after the frequency multiplication is at 6MHz～20MHz, and correspondingly, measuring relative errors can be dwindled N doubly.
The invention provides a kind of torsional vibration rotating velocity measuring apparatus, carry out DC-isolation, dividing potential drop, filtering, amplification and shaping processing by tach signal and obtain the full sized pules signal the output of gear holes probe, and isolate by photoelectricity and to be input in the torsional oscillation processing module, improve the antijamming capability of device, and guaranteed measuring accuracy.The present invention carries out evenly frequency multiplication of high multiple ground by phaselocked loop N frequency multiplication unit to the full sized pules signal, hundreds of frequencies that improve the full sized pules signal to number thousandfold, become the high-frequency pulse signal of number MHz even tens of MHz as the full sized pules conversion of signals that will count kHz, so improved measuring accuracy.The present invention handles the mean speed that obtains in the sampling period by high-frequency pulse signal is counted, obtain the fluctuation rotating speed by mean speed, obtain torsional oscillation rotating speed frequency spectrum or torsional oscillation rotating speed by the fluctuation rotating speed at last, not only can measure the torsional oscillation rotating speed of a plurality of frequencies, and the measuring accuracy height, make on the macro-axis the faint torsional oscillation between shaft part or the faint accurate measurement of waving of rotor become possibility.Torsional vibration rotating velocity measuring apparatus of the present invention can be directly used in the high-acruracy survey of big axial torsional vibration (or waving), has broad application prospects.
Fig. 9 is concrete circuit diagram of implementing of torsional vibration rotating velocity measuring apparatus of the present invention, and the circuit that adopts phase-locked loop chip CD4046 and frequency divider chip CD4020 to form is realized.As shown in Figure 9, discharge circuit U3A and U3B are used for wave shaping and drives, phase-locked loop chip CD4046 finishes the function of phase demodulation unit and VCO unit in the phaselocked loop N frequency multiplication unit, frequency divider chip CD4020 finishes N times of division function in the phaselocked loop N frequency multiplication unit, capacitor C 2, capacitor C 3 and resistance R 3 are finished the function of low-pass filter unit, capacitor C 1, resistance R 1 and resistance R 2 are finished the setting and the adjustment of VCO unit oscillation frequency and variation range thereof, and waved switch S1 finishes adjustment and the setting of different frequency division multiple N.During work, the full sized pules signal is imported from Input, high-frequency pulse signal is exported from Output, can obtain high-precision mean speed by the subsequent treatment system, and measuring relative errors can be dwindled N doubly.
Figure 10 adopts integrated circuit 74HCT9046 and 74HC4059 to realize for another concrete circuit diagram of implementing of torsional vibration rotating velocity measuring apparatus of the present invention.As shown in figure 10, the tach signal of gear holes probe output is imported by J1-Input, process is by capacitor C 01, resistance R 01, the DC-isolation that resistance R 02 and capacitor C 02 are formed, bleeder circuit, after amplifier U01A isolates amplification, enter by amplifier U01B, amplifier U02A, the low-pass filter filtering that resistance R 05～R08 and capacitor C 03～C06 form, amplify through amplifier U02B again, U03D carries out zero passage detection and wave shaping by the Randy Smyth trigger, obtain the full sized pules signal, amplify driving optocoupler pipe U04 through two triggers and carry out after photoelectricity is isolated signal being passed to follow-up signal processing unit.Above circuit is finished the conditioning of input signal, is powered by the U05 among the figure.
Phaselocked loop N frequency multiplication unit is made up of integrated chip U41, integrated chip U42 and related resistors electric capacity.Wherein integrated chip U41 finishes the function of phase demodulation unit and VCO unit in the phaselocked loop N frequency multiplication unit, integrated chip U42 finishes N frequency multiplication division function in the phaselocked loop N frequency multiplication unit, and capacitor C 22, capacitor C 23 and resistance R 27 are finished the function of low-pass filter unit.Can realize that by adjusting being provided with of switch S 1, switch S 2 and switch S 3 the frequency division multiple adjusts in 3～18000 data area.In the practical application, the frequency division multiple need be selected in 1500～8000 scopes according to the frequency of input signal.
Provided the example of three kinds of output high precision tach signals in the concrete enforcement circuit shown in Figure 10.One is that through being input to emission laser tube Oout after the Randy Smyth trigger U43D shaping, the output optical pulse signal is sent to the next stage signal processing unit by optical fiber by the pin 4 output high precision rotational speed pulse signals of integrated chip U41.Second dsp system that is high precision rotational speed pulse signal by pin 4 output of integrated chip U41 is delivered directly to same circuit unit carries out follow-up data processing, comprises counting, asks speed discrepancy, filtering and other computing and processing.The 3rd is the fluctuation of speed simulating signal by pin one 0 output of integrated chip U41, by amplifier U24A buffer compartment from after, through the low-pass filter unit of forming by amplifier U24B, amplifier U25A and relevant resistance capacitance, after amplifying, amplifier U25B exports simulating signal again by dWa.
Figure 11 is the process flow diagram of torsional vibration rotating velocity measuring method of the present invention, comprising:
Figure 12 comprises for obtaining the process flow diagram of torsional oscillation rotating speed in the torsional vibration rotating velocity measuring method of the present invention:
Torsional vibration rotating velocity measuring method of the present invention is to adopt the measuring method of torsional vibration rotating velocity measuring apparatus of the present invention, and its processing procedure describes in detail in the aforementioned embodiment, repeats no more here.In the step 43 of the present invention, both can adopt wherein a kind of processing mode, as carry out bandpass filtering treatment and obtain the torsional oscillation rotating speed, or carry out fast fourier transform and obtain torsional oscillation rotating speed frequency spectrum, also can adopt two kinds of processing modes, not only carry out bandpass filtering treatment and obtain the torsional oscillation rotating speed, and carry out fast fourier transform acquisition torsional oscillation rotating speed frequency spectrum.In addition, step 4 of the present invention also can adopt another kind of mode to obtain the torsional oscillation rotating speed, is about to simulating signal and carries out bandpass filtering treatment.Concrete processing procedure is: the simulating signal that the output signal of low-pass filter unit in the phaselocked loop N frequency multiplication unit is obtained change in voltage after straight amplification, this simulating signal is carried out after low-pass filtering and feature noise jamming handle, carry out the bandpass filtering of different frequency bands by a plurality of bandpass filter, obtain the torsional oscillation rotating speed of different frequency.
It should be noted that at last: above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not break away from the spirit and scope of technical solution of the present invention.
Claims (10)
1. torsional vibration rotating velocity measuring apparatus, comprise successively the gear holes probe that connects, every straight dividing potential drop filtration module with amplify Shaping Module, it is characterized in that, the amplification Shaping Module of outputting standard pulse signal is connected with the torsional oscillation processing module, and described torsional oscillation processing module comprises the frequency of described full sized pules signal is improved N doubly and export the phaselocked loop N frequency multiplication unit of high-frequency pulse signal and obtain the torsional oscillation processing unit of torsional oscillation rotating speed according to described high-frequency pulse signal.
2. torsional vibration rotating velocity measuring apparatus according to claim 1, it is characterized in that, described torsional oscillation processing module comprises also being arranged on and is used for optical transmission unit that tach signal is transmitted at a distance by optical fiber between described phaselocked loop N frequency multiplication unit and the torsional oscillation processing unit that described optical transmission unit comprises electrooptic switching element, Optical Fiber Transmission unit and the photoelectric conversion unit that connects successively.
3. torsional vibration rotating velocity measuring apparatus according to claim 2 is characterized in that, described torsional oscillation processing unit comprises DSP unit, interface unit and the computing unit that connects successively.
4. torsional vibration rotating velocity measuring apparatus according to claim 3, it is characterized in that, described DSP unit comprises step-by-step counting unit, revolution speed calculating unit and the fluctuation rotating speed unit that connects successively, described step-by-step counting unit also is connected with timing unit, and described fluctuation rotating speed unit also is connected with bandpass filtering unit or fft processing unit.
5. torsional vibration rotating velocity measuring apparatus according to claim 1 is characterized in that, also is provided with between described amplification Shaping Module and the torsional oscillation processing module by electrical isolation to improve the photoelectric isolation module of interference free performance.
6. torsional vibration rotating velocity measuring apparatus according to claim 1, it is characterized in that, described torsional oscillation processing unit comprises successively amplifying unit, low-pass filter unit, feature noise jamming unit and the bandpass filtering unit that connects, and the output terminal of the low-pass filter unit in described amplifying unit and the phaselocked loop N frequency multiplication unit is connected.
7. according to the described torsional vibration rotating velocity measuring apparatus of arbitrary claim in the claim 1～6, it is characterized in that, described phaselocked loop N frequency multiplication unit comprises the phase demodulation unit, low-pass filter unit, VCO unit and N times frequency unit, an input end of described phase demodulation unit is connected with photoelectric isolation module, another input end is connected with the output terminal of N times of frequency unit, low-pass filter unit is connected with the output terminal of phase demodulation unit, the VCO unit is connected with low-pass filter unit, the input end of N times of frequency unit is connected with the VCO unit, and output terminal is connected with another input end of phase demodulation unit.
8. torsional vibration rotating velocity measuring apparatus according to claim 7 is characterized in that, the frequency multiplication multiple N in the described N times frequency unit is 1500～8000.
9. a torsional vibration rotating velocity measuring method is characterized in that, comprising:
Step 1, the rotation of detection macro-axis also obtain tach signal;
Step 2, described tach signal is carried out DC-isolation, dividing potential drop, filtering, amplification and shaping is handled, obtain the full sized pules signal;
Step 3, described full sized pules signal is carried out 1500～8000 times process of frequency multiplication, obtain high-frequency pulse signal;
Step 4, described high-frequency pulse signal is handled, obtained the torsional oscillation rotating speed.
10. torsional vibration rotating velocity measuring method according to claim 9 is characterized in that, described step 4 comprises:
Step 41, described high-frequency pulse signal is carried out periodicity counting, obtain the mean speed in the sampling period;
Step 42, calculate the poor of described mean speed and rated speed, obtain near the fluctuation rotating speed of rotating speed rated speed;
Step 43, described fluctuation rotating speed is carried out bandpass filtering treatment obtain the torsional oscillation rotating speed and/or described fluctuation rotating speed is carried out fast fourier transform to obtain torsional oscillation rotating speed frequency spectrum.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102141574A (en) * | 2010-12-31 | 2011-08-03 | 西安交通大学 | Portable turbine dynamic rotating speed measuring device and method |
| CN105136285A (en) * | 2015-08-28 | 2015-12-09 | 中国神华能源股份有限公司 | Generator shafting torsional oscillation component extraction device and method |
| CN106646503A (en) * | 2016-08-26 | 2017-05-10 | 浙江赛安电气科技有限公司 | Yarn speed measurement device, yarn covering and twisting equipment and yarn rotating speed measurement method |
| CN109669034A (en) * | 2018-12-21 | 2019-04-23 | 苏州长光华医生物医学工程有限公司 | Liquid bottle liquid inspection system and its application method |
| CN111492249A (en) * | 2017-12-22 | 2020-08-04 | 大陆-特韦斯贸易合伙股份公司及两合公司 | Rotational speed sensor with improved resolution and multiple switching thresholds |
| CN113890454A (en) * | 2020-07-01 | 2022-01-04 | 大族激光科技产业集团股份有限公司 | Servo motor rotating speed feedback control system and method |
-
2009
- 2009-01-23 CN CNA200910001119XA patent/CN101509930A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102141574A (en) * | 2010-12-31 | 2011-08-03 | 西安交通大学 | Portable turbine dynamic rotating speed measuring device and method |
| CN102141574B (en) * | 2010-12-31 | 2012-07-25 | 西安交通大学 | Portable turbine dynamic rotating speed measuring device and method |
| CN105136285A (en) * | 2015-08-28 | 2015-12-09 | 中国神华能源股份有限公司 | Generator shafting torsional oscillation component extraction device and method |
| CN106646503A (en) * | 2016-08-26 | 2017-05-10 | 浙江赛安电气科技有限公司 | Yarn speed measurement device, yarn covering and twisting equipment and yarn rotating speed measurement method |
| CN111492249A (en) * | 2017-12-22 | 2020-08-04 | 大陆-特韦斯贸易合伙股份公司及两合公司 | Rotational speed sensor with improved resolution and multiple switching thresholds |
| CN109669034A (en) * | 2018-12-21 | 2019-04-23 | 苏州长光华医生物医学工程有限公司 | Liquid bottle liquid inspection system and its application method |
| CN113890454A (en) * | 2020-07-01 | 2022-01-04 | 大族激光科技产业集团股份有限公司 | Servo motor rotating speed feedback control system and method |
| CN113890454B (en) * | 2020-07-01 | 2023-07-21 | 大族激光科技产业集团股份有限公司 | Servo motor rotating speed feedback control system and method |
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