CN102980756A - Method and system for testing dynamic stiffness - Google Patents
Method and system for testing dynamic stiffness Download PDFInfo
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Abstract
The invention relates to the field of traffic rails and specifically relates to a method and a system for testing dynamic stiffness. The method for testing the dynamic stiffness includes that a force in a preset frequency range is applied to a rail in preset time to enable the rail to produce vibration; force signals and vibratory acceleration signals are real-timely acquired according to a preset sampling frequency; data of the force F, time corresponding to the force F, data of an acceleration a and time corresponding to the acceleration a are recorded according to preset time intervals, the acquired force signals and the acquired acceleration signals; a corresponding relation of a displacement X and the frequency f is obtained according to the corresponding relation of the data of the acceleration a and the time corresponding to the acceleration a; the corresponding relation of the displacement X and the time t is obtained; and the corresponding relation of the dynamic stiffness Z and the frequency f is obtained according to the corresponding relations and the corresponding relation of the dynamic stiffness, the displacement and the force, and namely, wide frequency dynamic stiffness is obtained. By means of the method and the system for testing the dynamic stiffness, the wide frequency dynamic stiffness of the rail can be tested.
Description
Technical field
The present invention relates to the traffic track field, be specifically related to method of testing and the system of dynamic stiffness.
Background technology
Track is the engineering structure of a globality as the important component part of rail track, generally is comprised of rail, sleeper, fastener and railway roadbed etc.It is as the vehicles very important in the modern society, and its security and the people's life is closely bound up.The Safety Evaluation Index of track mainly comprises quiet rigidity and dynamic stiffness.
The track dynamic stiffness is to characterize the important parameter that rail level under the dynamic condition is subjected to exciting force and the distortion both sides relation that is subjected to produce behind the exciting force, namely resists the ability of alternate load, and its value has represented the structural dynamic characteristic of track.It is numerically equal to the required alternating force of unit amplitude, and namely dynamic stiffness Z equals the displacement X(Z=F/X that alternating force F causes divided by this power).
This shows that the track dynamic stiffness can change with excitation force frequency, it has reflected the support performance of track vibration, is the key factor that affects wheel-rail interaction and train operation quality.
At present, the dynamic stiffness method of test tracks is by fatigue machine track to be applied the power of a certain fixed frequency, detects the power that applies by the power sensor again, detects the vibration displacement of track under this power by displacement transducer, thus the dynamic stiffness of obtaining.
Because fatigue machine can only apply the power of a certain fixed frequency, the dynamic stiffness that obtains also is the dynamic stiffness under a certain fixed frequency, thereby the dynamic stiffness under can not the different frequency of thoroughly evaluating track, i.e. wideband dynamic stiffness.
Summary of the invention
The method of testing of dynamic stiffness provided by the invention and system, wideband dynamic stiffness that can test tracks.
In order to achieve the above object, technical scheme of the present invention is achieved in that
The method of testing of dynamic stiffness comprises the following steps:
In Preset Time, track is applied power in the predeterminated frequency scope, make described track produce vibration;
According to default sample frequency, the acceleration a signal of the described power F signal of Real-time Collection and described vibration;
According to the default time interval, according to the described force signal and the described acceleration signal that gather, the time that data, the power F of record power F is corresponding, data and time corresponding to acceleration a of acceleration a;
According to the data of described acceleration a and the corresponding relation of time, obtain the corresponding relation of displacement X and frequency f;
According to the corresponding relation of described displacement X and frequency f, obtain the corresponding relation of displacement X and time t;
According to the corresponding relation of the corresponding relation of described displacement X and time t, described power F and time t, and the corresponding relation of dynamic stiffness and power F and displacement X, the dynamic stiffness Z of described track and the corresponding relation of time t obtained;
According to the corresponding relation of the corresponding relation of described dynamic stiffness Z and time t, described displacement X and time t and the corresponding relation of described displacement X and frequency f, obtain the corresponding relation of dynamic stiffness Z and frequency f.
Further, described according to the data of described acceleration a and the corresponding relation of time, obtain in the step of corresponding relation of displacement X and frequency f, according to the data of described acceleration a and the corresponding relation of time, adopt frequency domain analysis, obtain the corresponding relation of displacement X and frequency f, i.e. the wideband dynamic stiffness.
Further, described corresponding relation according to described displacement X and frequency f obtains in the step of corresponding relation of displacement X and time t, according to the corresponding relation of described displacement X and frequency f, adopts the inverse Fourier transform method, obtains the corresponding relation of displacement X and time t.
Further, described according to default sample frequency, the step of the acceleration a signal of the described power F signal of Real-time Collection and described vibration further comprises:
Described power F signal is added the power window, and described acceleration a signal is added window index.
Further, described according to the default time interval, according to the described force signal and the described acceleration signal that gather, in the step of the time that the time that data, the power F of record power F is corresponding, the data of acceleration a and acceleration a are corresponding, further comprise:
Remove the trend term of the data of described acceleration a.
Further, described according to the default time interval, according to the described force signal and the described acceleration signal that gather, in the step of the time that the time that data, the power F of record power F is corresponding, the data of acceleration a and acceleration a are corresponding, further comprise:
Adopt moving average method that the data of described acceleration a are carried out smoothing processing.
Further, described according to the default time interval, according to the described force signal and the described acceleration signal that gather, in the step of the time that the time that data, the power F of record power F is corresponding, the data of acceleration a and acceleration a are corresponding, further comprise:
The data of described acceleration a are carried out filtering to be processed.
The test macro of dynamic stiffness comprises:
Power hammer, acceleration transducer, signal collecting device and signal processor; Described power hammer comprises ram hammer and power sensor; Described ram hammer be connected the power sensor and connect; Signal collecting device is connected with described acceleration transducer, described power sensor, described signal processor respectively.
Described ram hammer is used for:
In Preset Time, track is applied power in the predeterminated frequency scope, make described track produce vibration;
Described power sensor and described signal collecting device are used for:
According to default sample frequency, the described power F signal of Real-time Collection;
Described acceleration transducer and described signal collecting device are used for:
According to default sample frequency, the acceleration a signal of the described vibration of Real-time Collection;
Described signal processor is used for:
According to the default time interval, according to the described force signal and the described acceleration signal that gather, the time that data, the power F of record power F is corresponding, data and time corresponding to acceleration a of acceleration a;
According to the data of described acceleration a and the corresponding relation of time, obtain the corresponding relation of displacement X and frequency f;
According to the corresponding relation of described displacement X and frequency f, obtain the corresponding relation of displacement X and time t;
According to the corresponding relation of the corresponding relation of described displacement X and time t, described power F and time t, and dynamic stiffness Z=F/X, the dynamic stiffness Z of described track and the corresponding relation of time t obtained;
According to the corresponding relation of the corresponding relation of described dynamic stiffness Z and time t, described displacement X and time t and the corresponding relation of described displacement X and frequency f, obtain the corresponding relation of dynamic stiffness Z and frequency f.
Further, further comprise:
Signal Conditioning Equipment; Described signal collecting device is connected with described signal processor by described signal regulating equipment;
Described signal regulating equipment is used for:
Described power F signal is added the power window;
Described acceleration a signal is added window index.
Further, described signal processor also is used for:
Remove the trend term of the data of described acceleration a;
Adopt moving average method to the described smoothing processing of carrying out;
The data of described acceleration a are carried out filtering to be processed.
Compared with prior art, the method for testing of dynamic stiffness provided by the invention and system, wideband dynamic stiffness that can test tracks.
Its principle of measuring the track dynamic stiffness is: when track is subject to the acting force of different frequency, can produce the vibration of different frequency, thereby the vibration displacement that produces is also different, thereby obtains the dynamic stiffness of dynamic stiffness under different vibration frequencies.Concrete method of testing is: according to measuring needs, within a certain period of time, track is applied the power of different frequency, and gather the acceleration a signal that this power F signal and track produce, again power F signal and acceleration a signal are converted into data, and record respectively time of both correspondences, the acceleration a of final entry track and the corresponding relation of time t and the power F that applies and the corresponding relation of time t, again according to the data of described acceleration a and the corresponding relation of time, obtain the corresponding relation of displacement X and frequency f, and then obtain the corresponding relation of displacement X and time t; While is according to the corresponding relation of the corresponding relation of described displacement X and time t, described power F and time t, and dynamic stiffness Z=F/X, obtains the dynamic stiffness Z of described track and the corresponding relation of time t; Last according to the corresponding relation of the corresponding relation of described dynamic stiffness Z and time t, described displacement X and time t and the corresponding relation of described displacement X and frequency f, obtain the corresponding relation of dynamic stiffness Z and frequency f, i.e. the wideband dynamic stiffness of track.
In addition, the method for testing of dynamic stiffness provided by the invention and system can also reach following beneficial effect:
(1) the power window refers to the correction factor to the noise signal of signal collecting device collection, after force signal adds the power window, can removal power hammer the outer noise signal of power that applies into shape.
(2) owing to the process that in the acceleration signal transmittance process is an infinite limit decay, thereby can only get finite term in the practical operation as its approximate value, thereby can produce error, this error is referred to as truncation error.And acceleration signal adds window index, can eliminate this truncation error.
(3) the vibration signal data that in vibration-testing, collect, because signal processor varies with temperature the zero point drift of generation, the unstable and sensor environmental interference on every side of the outer low frequency performance of sensor frequency scope, tending to the size that departs from baseline even depart from baseline also can temporal evolution, depart from the trend term that the time dependent whole process of baseline is called signal, it directly affects the correctness of signal, thereby its removal can be reduced accidental error.
(4) the vibration signal data that obtain by the signal collecting device sampling noise signal that often superposeed.Noise signal also has irregular random interfering signal except the periodic undesired signal such as power frequency and octave thereof is arranged.Because the frequency band of random interfering signal is wider, the shared ratio of radio-frequency component is also very large sometimes, so that present a lot of burrs on the oscillating curve that the discrete data that collects plots, and very rough.In order to weaken the impact of undesired signal, improve the oscillating curve smoothness, usually need sampled data is carried out smoothing processing.In addition, data smoothing is the irregular trend item of erasure signal further, and adopts moving average method to carry out smoothing processing.
(5) in analysis of vibration signal, digital filtering is the disposal route of choosing the interested a part of signal of people by mathematical operation from the discrete signal that gathers, and its effect is noise in the filtering test signal and false composition, improves signal to noise ratio (S/N ratio), smoothed analysis data, suppresses undesired signal, cross frequence component etc.
Description of drawings
In order to be illustrated more clearly in the specific embodiment of the present invention, the below will do simple the introduction to the accompanying drawing of required use in the embodiment, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the method for testing process flow diagram of the dynamic stiffness of the embodiment of the invention one.
Fig. 2 is the method for testing process flow diagram of the dynamic stiffness of the embodiment of the invention two.
Fig. 3 is test example test system structure synoptic diagram in the embodiment of the invention two.
Fig. 4 is the wideband dynamic stiffness test result synoptic diagram of test example in the embodiment of the invention two.
Reference numeral:
The 1-rail, 2-fastener system, 3-sleeper, 4-railway roadbed, 5-acceleration transducer, 6-power hammer, 7-computer, 8-signal collecting device, 9-Signal Conditioning Equipment.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer; the below will carry out clear, complete description to technical scheme of the present invention; based on the specific embodiment among the present invention; those of ordinary skills are resulting all other embodiment under the prerequisite of not making creative work, all belong to the scope that the present invention protects.
Embodiments of the invention one provide a kind of method of testing of dynamic stiffness, and as shown in Figure 1, it comprises the following steps:
101: in Preset Time, track is applied power in the predeterminated frequency scope, make described track produce vibration;
102: according to default sample frequency, the acceleration a degree signal of the described power F signal of Real-time Collection and described vibration;
103: according to the default time interval, according to the described force signal and the described acceleration signal that gather, the time that data, the power F of record power F is corresponding, data and time corresponding to acceleration a of acceleration a;
104: according to the data of described acceleration a and the corresponding relation of time, obtain the corresponding relation of displacement X and frequency f;
105: according to the corresponding relation of described displacement X and frequency f, obtain the corresponding relation of displacement X and time t;
106: according to the corresponding relation of the corresponding relation of described displacement X and time t, described power F and time t, and dynamic stiffness Z=F/X, obtain the dynamic stiffness Z of described track and the corresponding relation of time t;
107: according to the corresponding relation of the corresponding relation of described dynamic stiffness Z and time t, described displacement X and time t and the corresponding relation of described displacement X and frequency f, obtain the corresponding relation of dynamic stiffness Z and frequency f.
The principle of said method test tracks dynamic stiffness is: when track is subject to the acting force of different frequency, can produce the vibration of different frequency, thereby the vibration displacement that produces is also different, thereby obtains the dynamic stiffness of dynamic stiffness under different vibration frequencies.
Concrete method of testing is: according to measuring needs, within a certain period of time, track is applied the power of different frequency, and gather the acceleration a signal that this power F signal and track produce, again power F signal and acceleration a signal are converted into data, and record respectively time of both correspondences, the acceleration a of final entry track and the corresponding relation of time t and the power F that applies and the corresponding relation of time t, again according to the data of described acceleration a and the corresponding relation of time, obtain the corresponding relation of displacement X and frequency f, and then obtain the corresponding relation of displacement X and time t; While is according to the corresponding relation of the corresponding relation of described displacement X and time t, described power F and time t, and the corresponding relation (Z=F/X) of dynamic stiffness and power F and displacement X, obtains the dynamic stiffness Z of described track and the corresponding relation of time t; Last according to the corresponding relation of the corresponding relation of described dynamic stiffness Z and time t, described displacement X and time t and the corresponding relation of described displacement X and frequency f, obtain the corresponding relation of dynamic stiffness Z and frequency f, i.e. the wideband dynamic stiffness of track.
Wherein, the corresponding relation between the above-mentioned variable that relates to can show with arbitrary form, preferably adopts curve description, and is more directly perceived.
Present embodiment also provides the test macro of a cover dynamic stiffness of finishing above-mentioned test, comprising:
Power hammer, acceleration transducer, signal collecting device and signal processor; Described power hammer comprises ram hammer and power sensor; Described ram hammer be connected the power sensor and connect; Signal collecting device is connected with described acceleration transducer, described power sensor, described signal processor respectively.
Described ram hammer is used for:
In Preset Time, track is applied power in the predeterminated frequency scope, make described track produce vibration;
Described power sensor and described signal collecting device are used for:
According to default sample frequency, the described power F signal of Real-time Collection;
Described acceleration transducer and described signal collecting device are used for:
According to default sample frequency, the acceleration a signal of the described vibration of Real-time Collection;
Described signal processor is used for:
According to the default time interval, according to the described force signal and the described acceleration signal that gather, the time that data, the power F of record power F is corresponding, data and time corresponding to acceleration a of acceleration a;
According to the data of described acceleration a and the corresponding relation of time, obtain the corresponding relation of displacement X and frequency f;
According to the corresponding relation of described displacement X and frequency f, obtain the corresponding relation of displacement X and time t;
According to the corresponding relation of the corresponding relation of described displacement X and time t, described power F and time t, and dynamic stiffness Z=F/X, the dynamic stiffness Z of described track and the corresponding relation of time t obtained;
According to the corresponding relation of the corresponding relation of described dynamic stiffness Z and time t, described displacement X and time t and the corresponding relation of described displacement X and frequency f, obtain the corresponding relation of dynamic stiffness Z and frequency f.
Wherein, signal processor can be selected any device, preferably adopts computer, and computational data speed is fast, convenient operation.Adopt the dynamic stiffness of said system test tracks, simple to operate, robotization is higher, so that measurement is more accurate, the DATA REASONING process is specific as follows:
Hammering rail firmly, the response of measuring simultaneously it is to measure the kinematic behavior of rail system.Force signal is inputted as system, and the displacement response is as system's output, and the ssystem transfer function that obtains like this is:
Y=X/F （1）
In the formula (1): X is displacement, and F is power.This is equivalent to the support dynamic flexibility Y of rail system.The displacement response signal is inputted as system, and force signal is exported as system, and the ssystem transfer function inverse that obtains is:
Z=F/X （2）
In the formula (2): Z is equivalent to the supporting dynamic stiffness of rail system.
We measure its acceleration responsive with acceleration transducer, input as system with force signal, and the acceleration responsive signal is done transfer function analysis and obtained as output:
In the formula (3): a is acceleration.
The supporting acceleration admittance that is equivalent to rail system.Acceleration admittance is done functional transformation, also can obtain the supporting dynamic stiffness of rail system.Like this, we just can with the response of acceleration transducer acceleration measurement, then carry out conversion with regard to the wideband dynamic stiffness of available rail system.
In order further to improve the degree of accuracy of method of testing, embodiments of the invention two also provide the method for testing of another kind of dynamic stiffness, and as shown in Figure 2, it comprises the following steps:
201: in Preset Time, track is applied power in the predeterminated frequency scope, make described track produce vibration;
202: according to default sample frequency, the acceleration a degree signal of the described power F signal of Real-time Collection and described vibration;
203: described power F signal is added the power window, and described acceleration a signal is added window index;
204: according to the default time interval, according to the described force signal and the described acceleration signal that gather, the time that data, the power F of record power F is corresponding, data and time corresponding to acceleration a of acceleration a;
205: the trend term of removing the data of described acceleration a;
206: adopt moving average method that the data of described acceleration a are carried out smoothing processing;
207: the data of described acceleration a are carried out filtering process;
208: according to the data of described acceleration a and the corresponding relation of time, adopt frequency domain analysis, obtain the corresponding relation of displacement X and frequency f;
209: according to the corresponding relation of described displacement X and frequency f, adopt the inverse Fourier transform method, obtain the corresponding relation of displacement X and time t;
210: according to the corresponding relation of the corresponding relation of described displacement X and time t, described power F and time t, and the corresponding relation Z=F/X of dynamic stiffness and power F and displacement X, obtain the dynamic stiffness Z of described track and the corresponding relation of time t;
211: according to the corresponding relation of the corresponding relation of described dynamic stiffness Z and time t, described displacement X and time t and the corresponding relation of described displacement X and frequency f, obtain the corresponding relation of dynamic stiffness Z and frequency f, i.e. the wideband dynamic stiffness.
Compare with embodiment one, in the step 203 of present embodiment, after power F signal adds the power window, can removal power hammer the outer noise signal of power that applies into shape; And acceleration a signal adds window index, can eliminate truncation error; Thereby two signals are proofreaied and correct, eliminated the systematic error of method.
And step 205,206,207 can removing method accidental error, specific as follows:
(1) the vibration signal data that in vibration-testing, collect, because signal processor varies with temperature the zero point drift of generation, the unstable and sensor environmental interference on every side of the outer low frequency performance of sensor frequency scope, tending to the size that departs from baseline even depart from baseline also can temporal evolution, depart from the trend term that the time dependent whole process of baseline is called signal, it directly affects the correctness of signal, thereby its taking-up can be reduced accidental error.
(2) the vibration signal data that obtain by the signal collecting device sampling noise signal that often superposeed.Noise signal also has irregular random interfering signal except the periodic undesired signal such as power frequency and octave thereof is arranged.Because the frequency band of random interfering signal is wider, the shared ratio of radio-frequency component is also very large sometimes, so that present a lot of burrs on the oscillating curve that the discrete data that collects plots, and very rough.In order to weaken the impact of undesired signal, improve the oscillating curve smoothness, usually need sampled data is carried out smoothing processing.In addition, all right further irregular trend item of erasure signal of data smoothing.
(3) in analysis of vibration signal, digital filtering is the disposal route of choosing the interested a part of signal of people by mathematical operation from the discrete signal that gathers, and its effect is noise in the filtering test signal and false composition, improves signal to noise ratio (S/N ratio), smoothed analysis data, suppresses undesired signal, cross frequence component etc.
This shows that the measuring error of present embodiment further reduces, degree of accuracy improves.
Present embodiment also provides the test macro of the another set of dynamic stiffness of finishing said method, except the equipment that comprises embodiment one, also comprises Signal Conditioning Equipment; Described signal collecting device is connected with described signal processor by described signal regulating equipment;
Described signal regulating equipment is used for:
Described force signal is added the power window;
Described acceleration signal is added window index;
And described signal processor also is used for:
Remove the trend term of the data of described acceleration a;
Adopt moving average method to the described smoothing processing of carrying out;
The data of described acceleration a are carried out filtering to be processed.
In addition, present embodiment also provides concrete test example, further verifies the beneficial effect of present embodiment, and is specific as follows:
Test example: as shown in Figure 3, laboratory sample has the WJ-7 fastener system, standard 60 rail that 60cm is long.Wherein, fastener system is installed on the I type fragment-free track slab, and full support of track plates is shelved on the cement flooring, and the railway spike bolt torque is 300Nm during fastener for installing, and T-shaped bolt torque is 150Nm.
Testing procedure:
The first step: connect each instrument with reference to Fig. 3, among the figure 1 be rail, 2 for fastener system, 3 for sleeper, 4 for railway roadbed, 5 for acceleration transducer, 6 for power hammer, 7 for notebook computer, 8 for signal collecting device, 9 be Signal Conditioning Equipment.Wherein, acceleration transducer and power hammer sensor connecting line access signal collecting device, collecting device connects notebook computer, with record test data.
Second step: load exciting force and collection signal, sample frequency is 51.2KHZ, according to the 20KHZ frequency signal is converted into data, and the research frequency is 0-5000HZ, acceleration signal and noise signal enter computer by signal collecting device, and average mode is linear averaging 8 times.Track is carried out vertical excitation, and energized position is the rail middle part.Respectively collection power is hammered the vibratory response to exciting force and the rail of track into shape, and gets the mean value of 3 tests.Wherein the exciting force signal of input is pulse excitation signal, and in Signal Conditioning Equipment 9, afterburning window is to remove surging force noise signal in addition; Output signal is the damped vibration signal, in Signal Conditioning Equipment 9, adds window index and makes signal decay to 0 when finishing, to eliminate truncation error.
The 3rd step: computer is eliminated trend term.
The 4th step: smoothing processing data in computer, adopt 5 moving average method smoothing processing, number of processes is 10 times.
The 5th one: in computer, carry out digital filtering.
The 6th step: in computer, pick up acceleration a-time t curve and power F-time t curve, and use frequency domain analysis and inverse fourier transform conversion method, degree of will speed up a-time t curve is converted into displacement X-frequency f curve and displacement X-time t curve.
The 7th step: in computer, calculate rail system wideband dynamic stiffness, thereby obtain the dynamic stiffness of test point.
Test findings: because the range ability of power hammer is 0～3000Hz, so during analysis of Dynamic Stiffness, can only guarantee that best result analyses 3000Hz.Obtain rail system wideband dynamic stiffness curve as shown in Figure 4.
It should be noted that at last: above specific embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to aforementioned specific embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned embodiments is put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make essence disengaging each embodiment of the present invention of appropriate technical solution and the spirit and scope of specific embodiment technical scheme.
Claims (10)
1. the method for testing of dynamic stiffness is characterized in that, comprises the following steps:
In Preset Time, track is applied power in the predeterminated frequency scope, make described track produce vibration;
According to default sample frequency, the acceleration a signal of the described power F signal of Real-time Collection and described vibration;
According to the default time interval, according to the described force signal and the described acceleration signal that gather, the time that data, the power F of record power F is corresponding, data and time corresponding to acceleration a of acceleration a;
According to the data of described acceleration a and the corresponding relation of time, obtain the corresponding relation of displacement X and frequency f;
According to the corresponding relation of described displacement X and frequency f, obtain the corresponding relation of displacement X and time t;
According to the corresponding relation of the corresponding relation of described displacement X and time t, described power F and time t, and the corresponding relation of dynamic stiffness and power F and displacement X, the dynamic stiffness Z of described track and the corresponding relation of time t obtained;
According to the corresponding relation of the corresponding relation of described dynamic stiffness Z and time t, described displacement X and time t and the corresponding relation of described displacement X and frequency f, obtain the corresponding relation of dynamic stiffness Z and frequency f, i.e. the wideband dynamic stiffness.
2. the method for testing of dynamic stiffness as claimed in claim 1, it is characterized in that, described according to the data of described acceleration a and the corresponding relation of time, obtain in the step of corresponding relation of displacement X and frequency f, according to the data of described acceleration a and the corresponding relation of time, adopt frequency domain analysis, obtain the corresponding relation of displacement X and frequency f.
3. the method for testing of dynamic stiffness as claimed in claim 1, it is characterized in that, described corresponding relation according to described displacement X and frequency f, obtain in the step of corresponding relation of displacement X and time t, corresponding relation according to described displacement X and frequency f, adopt the inverse Fourier transform method, obtain the corresponding relation of displacement X and time t.
4. the method for testing of dynamic stiffness as claimed in claim 1 is characterized in that, described according to default sample frequency, the step of the acceleration a signal of the described power F signal of Real-time Collection and described vibration further comprises:
Described power F signal is added the power window, and described acceleration a signal is added window index.
5. the method for testing of dynamic stiffness as claimed in claim 1, it is characterized in that, described according to the default time interval, according to the described force signal and the described acceleration signal that gather, in the step of the time that the time that data, the power F of record power F is corresponding, the data of acceleration a and acceleration a are corresponding, further comprise:
Remove the trend term of the data of described acceleration a.
6. the method for testing of dynamic stiffness as claimed in claim 1, it is characterized in that, described according to the default time interval, according to the described force signal and the described acceleration signal that gather, in the step of the time that the time that data, the power F of record power F is corresponding, the data of acceleration a and acceleration a are corresponding, further comprise:
Adopt moving average method that the data of described acceleration a are carried out smoothing processing.
7. the method for testing of dynamic stiffness as claimed in claim 1, it is characterized in that, described according to the default time interval, according to the described force signal and the described acceleration signal that gather, in the step of the time that the time that data, the power F of record power F is corresponding, the data of acceleration a and acceleration a are corresponding, further comprise:
The data of described acceleration a are carried out filtering to be processed.
8. the test macro of dynamic stiffness is characterized in that, comprising:
Power hammer, acceleration transducer, signal collecting device and signal processor; Described power hammer comprises ram hammer and power sensor; Described ram hammer be connected the power sensor and connect; Signal collecting device is connected with described acceleration transducer, described power sensor, described signal processor respectively;
Described ram hammer is used for:
In Preset Time, track is applied power in the predeterminated frequency scope, make described track produce vibration;
Described power sensor and described signal collecting device are used for:
According to default sample frequency, the described power F signal of Real-time Collection;
Described acceleration transducer and described signal collecting device are used for:
According to default sample frequency, the acceleration a signal of the described vibration of Real-time Collection;
Described signal processor is used for:
According to the default time interval, according to the described force signal and the described acceleration signal that gather, the time that data, the power F of record power F is corresponding, data and time corresponding to acceleration a of acceleration a;
According to the data of described acceleration a and the corresponding relation of time, obtain the corresponding relation of displacement X and frequency f;
According to the corresponding relation of described displacement X and frequency f, obtain the corresponding relation of displacement X and time t;
According to the corresponding relation of the corresponding relation of described displacement X and time t, described power F and time t, and the corresponding relation of dynamic stiffness and power F and displacement X, the dynamic stiffness Z of described track and the corresponding relation of time t obtained;
According to the corresponding relation of the corresponding relation of described dynamic stiffness Z and time t, described displacement X and time t and the corresponding relation of described displacement X and frequency f, obtain the corresponding relation of dynamic stiffness Z and frequency f, i.e. the wideband dynamic stiffness.
9. the test macro of dynamic stiffness as claimed in claim 8 is characterized in that, further comprises:
Signal Conditioning Equipment; Described signal collecting device is connected with described signal processor by described signal regulating equipment;
Described signal regulating equipment is used for:
Described power F signal is added the power window;
Described acceleration a signal is added window index.
10. the test macro of dynamic stiffness as claimed in claim 8 is characterized in that, described signal processor also is used for:
Remove the trend term of the data of described acceleration a;
Adopt moving average method to the described smoothing processing of carrying out;
The data of described acceleration a are carried out filtering to be processed.
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Cited By (17)
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| CN106197917A (en) * | 2016-06-29 | 2016-12-07 | 天津航天瑞莱科技有限公司 | The processing method of acceleration time domain truncated signal Waveform reproduction |
| CN106768944A (en) * | 2016-12-19 | 2017-05-31 | 中铁隆昌铁路器材有限公司 | Adjustable rail snap fit part fatigue test augmentor and method |
| CN106885736A (en) * | 2017-03-23 | 2017-06-23 | 西安交通大学 | A kind of spindle rotor dynamic stiffness Performance Test System |
| CN106926869A (en) * | 2017-03-28 | 2017-07-07 | 西南交通大学 | Wideband orbit rigidity testing equipment and system |
| CN106932162A (en) * | 2017-03-28 | 2017-07-07 | 西南交通大学 | Track dynamic stiffness method of testing and system |
| CN106950047A (en) * | 2017-03-09 | 2017-07-14 | 西安交通大学 | The visual analysis method of vibration acceleration signal frequency spectrum |
| CN106969892A (en) * | 2017-03-28 | 2017-07-21 | 西南交通大学 | Track dynamic stiffness detection device and system |
| CN107941488A (en) * | 2017-11-20 | 2018-04-20 | 中国重汽集团济南动力有限公司 | A kind of vehicle sheet steel spring dynamic stiffness assay method |
| CN108387350A (en) * | 2018-02-09 | 2018-08-10 | 上汽通用五菱汽车股份有限公司 | Vehicle body attachment point dynamic stiffness test method, device and storage medium |
| CN108593095A (en) * | 2018-04-26 | 2018-09-28 | 盐城博鸣信息科技有限公司 | A kind of Vibration Fault Signal acquiring and processing method of converter power transformer tap switch |
| CN111044240A (en) * | 2019-12-18 | 2020-04-21 | 沈阳鼓风机集团股份有限公司 | System and method for determining basic support stiffness of compressor |
| CN112395709A (en) * | 2020-11-30 | 2021-02-23 | 中船动力研究院有限公司 | Method, device, equipment and medium for modifying torsional vibration state characteristics of indirect shaft system |
| CN113124998A (en) * | 2021-03-26 | 2021-07-16 | 中铁二院工程集团有限责任公司 | Rail rigidity time-frequency measurement method based on P2 force vibration |
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| CN103207097A (en) * | 2013-04-03 | 2013-07-17 | 中国铁道科学研究院铁道建筑研究所 | Dynamic detection method of track stiffness |
| CN104596713A (en) * | 2014-12-31 | 2015-05-06 | 北京中铁瑞威工程检测有限责任公司 | High-speed rail bearing layer stability detecting method and system |
| CN106197917B (en) * | 2016-06-29 | 2019-01-04 | 天津航天瑞莱科技有限公司 | The processing method of acceleration time domain truncated signal Waveform reproduction |
| CN106197917A (en) * | 2016-06-29 | 2016-12-07 | 天津航天瑞莱科技有限公司 | The processing method of acceleration time domain truncated signal Waveform reproduction |
| CN106768944A (en) * | 2016-12-19 | 2017-05-31 | 中铁隆昌铁路器材有限公司 | Adjustable rail snap fit part fatigue test augmentor and method |
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| CN106885736B (en) * | 2017-03-23 | 2019-08-13 | 西安交通大学 | A kind of spindle rotor dynamic stiffness Performance Test System |
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| CN106969892A (en) * | 2017-03-28 | 2017-07-21 | 西南交通大学 | Track dynamic stiffness detection device and system |
| CN106969892B (en) * | 2017-03-28 | 2019-11-01 | 西南交通大学 | Track dynamic stiffness detection device and system |
| CN107941488A (en) * | 2017-11-20 | 2018-04-20 | 中国重汽集团济南动力有限公司 | A kind of vehicle sheet steel spring dynamic stiffness assay method |
| CN108387350A (en) * | 2018-02-09 | 2018-08-10 | 上汽通用五菱汽车股份有限公司 | Vehicle body attachment point dynamic stiffness test method, device and storage medium |
| CN108593095A (en) * | 2018-04-26 | 2018-09-28 | 盐城博鸣信息科技有限公司 | A kind of Vibration Fault Signal acquiring and processing method of converter power transformer tap switch |
| CN111044240A (en) * | 2019-12-18 | 2020-04-21 | 沈阳鼓风机集团股份有限公司 | System and method for determining basic support stiffness of compressor |
| CN111044240B (en) * | 2019-12-18 | 2021-06-22 | 沈阳鼓风机集团股份有限公司 | System and method for determining basic support stiffness of compressor |
| CN112395709A (en) * | 2020-11-30 | 2021-02-23 | 中船动力研究院有限公司 | Method, device, equipment and medium for modifying torsional vibration state characteristics of indirect shaft system |
| CN112395709B (en) * | 2020-11-30 | 2024-03-29 | 中船动力研究院有限公司 | Modification method, device, equipment and medium for indirect shafting torsional vibration dynamic characteristics |
| CN113124998B (en) * | 2021-03-26 | 2022-09-20 | 中铁二院工程集团有限责任公司 | Rail rigidity time-frequency measurement method based on P2 force vibration |
| CN113124998A (en) * | 2021-03-26 | 2021-07-16 | 中铁二院工程集团有限责任公司 | Rail rigidity time-frequency measurement method based on P2 force vibration |
| CN113358305A (en) * | 2021-06-02 | 2021-09-07 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Track structure dynamic stiffness identification method, device, system, medium and equipment |
| CN115219125A (en) * | 2021-09-10 | 2022-10-21 | 广州汽车集团股份有限公司 | Dynamic stiffness testing method and system for rubber elastic part |
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