CN103712796A - Bearing fatigue signal detection system - Google Patents
Bearing fatigue signal detection system Download PDFInfo
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- CN103712796A CN103712796A CN201310684230.XA CN201310684230A CN103712796A CN 103712796 A CN103712796 A CN 103712796A CN 201310684230 A CN201310684230 A CN 201310684230A CN 103712796 A CN103712796 A CN 103712796A
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Abstract
The invention relates to a bearing fatigue signal detection system which is applied to fatigue state detection and fault diagnosis of high-speed precision motion bearings and can provide a measurement basis for effective conduction of fault diagnosis research and material fatigue test. A fatigue vibration signal analysis method is adopted in the invention, and effective fatigue damage signals are extracted through the detection system composed of a fatigue signal pre-extraction and conditioning module, a fatigue signal tracking filter processing module and a fatigue state analysis and display module. The fatigue signal tracking filter processing module acquires effective fatigue vibration signals from signals including all kinds of noise according to the rule that the frequency of fatigue vibration signals changes along with the motion of high-speed precision components. Effective fatigue vibration damage signals are extracted from complex background noise through a tracking filter technology, which enables the efficiency and accuracy of micro damage signal detection to be greatly improved.
Description
Technical field
The present invention is a kind of bearing fatigue signal detection system, belong to tiny signal precision measurement equipment, this system adopts Fatigue Vibration KLR signal approach, mainly by tracking filtering technique, the fatigue damage vibration signal of high speed and precision motor element is detected, thereby provide important evidence for the wear-out failure diagnosis of high speed and precision motor element and the fatigue experiment of material.
Background technology
High speed and precision motor element (for example Aero-engine Bearing) is after damaging, and effective fatigue damage signal of its generation is fainter, and ground unrest more complicated.And there is corresponding variation along with the variation of element movement velocity in the frequency of this fatigue damage signal.These have all increased the difficulty to the effective fatigue damage signal extraction of element.The fatigue damage method for extracting signal using has at present comprised temperature detection method, oil analysis method harmony reflectometry etc.But above method all exists the shortcoming that operation is difficult, cost is high and precision sensitivity is poor, be difficult to meet the testing requirement of high speed and precision motor element fatigue damage signal.
Summary of the invention
The present invention designs a kind of bearing fatigue signal detection system is provided for above-mentioned the deficiencies in the prior art just, this system is according to the speed of bearing movable, to gathering the fatigue damage signal with high ground unrest extracting, carry out tracking filter amplification processing, thereby can be by faint effective Fatigue Vibration signal extraction out, for the judgement of fatigue damage degree.
The object of the invention is to be achieved through the following technical solutions:
This bearing fatigue signal detection system, is characterized in that: this system comprises:
(1) the preposition extraction of tired signal and conditioning module, this module is carried out Real-time Collection to the vibration signal of bearing and rate signal, respectively vibration signal is carried out amplification filtering processing and rate signal is carried out to phase locking frequency multiplying processing, vibration signal and rate signal after processing are sent to tracking filter processing module, this module is by vibration signal detecting sensor (1), preposition vibration signal modulate circuit (2), velocity meter (3), rate signal phase lock circuitry (4) and rate signal frequency multiplier circuit (5) form, wherein: the vibration signal detecting sensor (1) that receives bearing vibration signal is connected with preposition vibration signal modulate circuit (2), vibration signal after filter amplifying processing is transferred to tracking filter processing module, and the velocity meter (3) of reception bearing high-speed motion signal, rate signal phase lock circuitry (4) is connected successively with rate signal frequency multiplier circuit (5), rate signal after processing is transferred to tracking filter processing module and signal analysis and display module,
(2) vibration signal tracking filter processing module, what this module received is bearing vibration signal and the rate signal that the preposition extraction of tired signal and conditioning module provide, it carries out tracking filter and low-pass filtering treatment according to rate signal to vibration signal, by the ground unrest filtering in vibration signal, thereby obtain bearing fatigue vibration signal effectively, vibration signal is transferred to tired signal analysis and display module the most at last, this module is comprised of tracking filter treatment circuit (6) and low-pass filtering treatment circuit (7), they are connected successively, the vibration signal obtaining is carried out to tracking filter, the effective vibration signal obtaining after filtering is transferred to tired signal analysis and display module,
(3) signal analysis and display module, this module receives is the bearing rate signal that effective vibration signal of providing of vibration signal tracking filter processing module and the preposition extraction of tired signal and conditioning module provide, it completes the record to the demonstration of vibration signal amplitude size and bearing rotary speed and number of times, this module is comprised of Fatigue Vibration signal controlling instrument (8), number of revolutions display instrument (9) and tachometer gage (10), wherein Fatigue Vibration signal controlling instrument (8) is connected with vibration signal tracking filter processing module, the effective vibration signal of transmission process; Preposition extraction is connected with conditioning module with tired signal respectively for number of revolutions display instrument (9), tachometer gage (10), transmission process be bearing rate signal.
Vibration signal detecting sensor (1) is selected the sensor based on acceleration detection principle.
Signal multivibrator in rate signal phase lock circuitry (4) and rate signal frequency multiplier circuit (5) and phase locking unit select respectively CD4528 and CD4046 chip to realize, and signal frequency multiplication device is realized respectively 100,200 and 300 frequencys multiplication by the combination of CD4518 and CD4520 chip.
Tracking filter treatment circuit (6) is realized by switching capacity filter MF10CCN and the circuit that takes absolute value.
The principle of technical solution of the present invention is: due to the fatigue damage signal of high speed and precision motor element a little less than, and ground unrest is complicated, there is corresponding variation along with the variation of element movement velocity in fatigue damage signal frequency effectively, system of the present invention gathers vibration signal (comprising ground unrest) and element motor message by the preposition extraction of tired signal and conditioning module, and the signal collecting is carried out corresponding shaping and amplifies and process, vibration signal tracking filter processing module is passed through switching capacity filter, according to the movement velocity of element, extract effective fatigue damage signal, finally, detection system intuitively shows the amplitude of fatigue damage signal.
The advantage of technical solution of the present invention is: the method has adopted switching capacity filter, and having overcome effective vibration signal centre frequency can change and the difficulty of variation along with element speeds.Detection sensitivity and accuracy are high, have higher signal to noise ratio (S/N ratio), and cost is lower, easy and simple to handle, meet the testing requirement of high speed and precision motor element fatigue damage signal.
Accompanying drawing explanation
Fig. 1 is that system of the present invention forms schematic diagram
Fig. 2 is composition and the signal processing flow figure of each module in system of the present invention
Fig. 3 is the circuit diagram of preposition vibration signal modulate circuit in system of the present invention
Fig. 4 is the circuit diagram of system speed signal phase lock circuitry of the present invention and rate signal frequency multiplier circuit
Fig. 5 is the circuit diagram of tracking filter treatment circuit in system of the present invention
Embodiment
Below with reference to drawings and Examples, technical solution of the present invention is further described:
Shown in accompanying drawing 1～2, this kind of bearing fatigue signal detection system, is characterized in that: this system comprises:
(1) the preposition extraction of tired signal and conditioning module, this module is carried out Real-time Collection to the vibration signal of bearing and rate signal, respectively vibration signal is carried out amplification filtering processing and rate signal is carried out to phase locking frequency multiplying processing, vibration signal and rate signal after processing are sent to tracking filter processing module, this module is by vibration signal detecting sensor 1, preposition vibration signal modulate circuit 2, velocity meter 3, rate signal phase lock circuitry 4 and rate signal frequency multiplier circuit 5 form, wherein: the vibration signal detecting sensor 1 that receives bearing vibration signal is connected with preposition vibration signal modulate circuit 2, vibration signal after filter amplifying processing is transferred to tracking filter processing module, and the velocity meter 3 of reception bearing high-speed motion signal, rate signal phase lock circuitry 4 is connected successively with rate signal frequency multiplier circuit 5, rate signal after processing is transferred to tracking filter processing module and signal analysis and display module,
(2) vibration signal tracking filter processing module, what this module received is bearing vibration signal and the rate signal that the preposition extraction of tired signal and conditioning module provide, it carries out tracking filter and low-pass filtering treatment according to rate signal to vibration signal, by the ground unrest filtering in vibration signal, thereby obtain bearing fatigue vibration signal effectively, vibration signal is transferred to tired signal analysis and display module the most at last, this module is comprised of tracking filter treatment circuit 6 and low-pass filtering treatment circuit 7, they are connected successively, the vibration signal obtaining is carried out to tracking filter, the effective vibration signal obtaining after filtering is transferred to tired signal analysis and display module,
(3) signal analysis and display module, this module receives is the bearing rate signal that effective vibration signal of providing of vibration signal tracking filter processing module and the preposition extraction of tired signal and conditioning module provide, it completes the record to the demonstration of vibration signal amplitude size and bearing rotary speed and number of times, this module is comprised of Fatigue Vibration signal controlling instrument 8, number of revolutions display instrument 9 and tachometer gage 10, wherein Fatigue Vibration signal controlling instrument 8 is connected with vibration signal tracking filter processing module, the effective vibration signal of transmission process; Preposition extraction is connected with conditioning module with tired signal respectively for number of revolutions display instrument 9, tachometer gage 10, transmission process be bearing rate signal.
The sensor that vibration signal detecting sensor 1 is selected based on acceleration detection principle.
The attached implementing circuit figure that Figure 3 shows that preposition vibration signal modulate circuit 2, Figure 4 shows that the implementing circuit figure of rate signal phase lock circuitry 4 and rate signal frequency multiplier circuit 5, wherein, signal multivibrator and phase locking unit select respectively CD4528 and CD4046 chip to realize, and signal frequency multiplication device is realized respectively 100,200 and 300 frequencys multiplication by the combination of CD4518 and CD4520 chip.The attached implementing circuit figure that Figure 5 shows that tracking filter treatment circuit 6, wherein, switching capacity filter selects MF10CCN chip to realize, according to the rate signal collecting before, from tired signal (comprising noise), extract effective fatigue damage vibration signal, and it is taken absolute value and low-pass filtering treatment.
The bearing signal detection system that this patent is set forth finally can form a set of vibration signal detecting instrument, this instrument can be applied on bearing material fatigue tester, it is by common alternating current 220V Power supply, by light electric tachometer and the vibration signal acceleration transducer being arranged on testing machine, gather movement velocity and vibration signal, then utilize the associated circuit board of detecting instrument inside to process signal, finally by the instrument on instrument, vibration signal and rate signal are shown in real time.
The course of work of the tired signal detection system of the present invention:
In high speed and precision motor element (as Aero-engine Bearing) after there is fatigue damage, it can produce the Fatigue Vibration signal changing with element speeds, and the ground unrest of this signal is complicated.First, by advance signal extraction and conditioning module, by vibration signal acceleration transducer 1 and 2 pairs of fatigue damage signals of advance signal modulate circuit, extract and amplify, and detect by the movement velocity of 3 pairs of motor elements of photoelectric velocity measurement meter, the rate signal obtaining is processed by speed phase lock circuitry 4 and frequency multiplier circuit 5, thereby provided rate signal and the vibration signal of respective frequencies for tracking filter processing module.Then, tracking filter processing module, according to the rate signal frequency obtaining, is utilized switching capacity filter to carry out filtering to vibration signal, and is carried out signal absolute value and low-pass filtering treatment, thereby obtain effective Fatigue Vibration signal.Finally, fatigue damage signal analysis and display module show the movement velocity of motor element, number of revolutions and Fatigue Vibration signal.
Claims (4)
1. a bearing fatigue signal detection system, is characterized in that: this system comprises:
(1) the preposition extraction of tired signal and conditioning module, this module is carried out Real-time Collection to the vibration signal of bearing and rate signal, respectively vibration signal is carried out amplification filtering processing and rate signal is carried out to phase locking frequency multiplying processing, vibration signal and rate signal after processing are sent to tracking filter processing module, this module is by vibration signal detecting sensor (1), preposition vibration signal modulate circuit (2), velocity meter (3), rate signal phase lock circuitry (4) and rate signal frequency multiplier circuit (5) form, wherein: the vibration signal detecting sensor (1) that receives bearing vibration signal is connected with preposition vibration signal modulate circuit (2), vibration signal after filter amplifying processing is transferred to tracking filter processing module, and the velocity meter (3) of reception bearing high-speed motion signal, rate signal phase lock circuitry (4) is connected successively with rate signal frequency multiplier circuit (5), rate signal after processing is transferred to tracking filter processing module and signal analysis and display module,
(2) vibration signal tracking filter processing module, what this module received is bearing vibration signal and the rate signal that the preposition extraction of tired signal and conditioning module provide, it carries out tracking filter and low-pass filtering treatment according to rate signal to vibration signal, by the ground unrest filtering in vibration signal, thereby obtain effective bearing fatigue vibration signal, vibration signal is transferred to tired signal analysis and display module the most at last, this module is comprised of tracking filter treatment circuit (6) and low-pass filtering treatment circuit (7), they are connected successively, the vibration signal obtaining is carried out to tracking filter, the effective vibration signal obtaining after filtering is transferred to tired signal analysis and display module,
(3) signal analysis and display module, this module receives is the bearing rate signal that effective vibration signal of providing of vibration signal tracking filter processing module and the preposition extraction of tired signal and conditioning module provide, it completes the record to the demonstration of vibration signal amplitude size and bearing rotary speed and number of times, this module is comprised of Fatigue Vibration signal controlling instrument (8), number of revolutions display instrument (9) and tachometer gage (10), wherein Fatigue Vibration signal controlling instrument (8) is connected with vibration signal tracking filter processing module, the effective vibration signal of transmission process; Preposition extraction is connected with conditioning module with tired signal respectively for number of revolutions display instrument (9), tachometer gage (10), transmission process be bearing rate signal.
2. bearing fatigue signal detection system according to claim 1, is characterized in that: vibration signal detecting sensor (1) is selected the sensor based on acceleration detection principle.
3. bearing fatigue signal detection system according to claim 1, it is characterized in that: the signal multivibrator in rate signal phase lock circuitry (4) and rate signal frequency multiplier circuit (5) and phase locking unit select respectively CD4528 and CD4046 chip to realize, signal frequency multiplication device is realized respectively 100,200 and 300 frequencys multiplication by the combination of CD4518 and CD4520 chip.
4. bearing fatigue signal detection system according to claim 1, is characterized in that: tracking filter treatment circuit (6) is realized by switching capacity filter MF10CCN and the circuit that takes absolute value.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107167318A (en) * | 2017-06-19 | 2017-09-15 | 北京时代龙城科技有限责任公司 | A kind of quick failure diagnostic apparatus of bearing intelligent and diagnostic method |
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Application publication date: 20140409 |