CN106932162A - Track dynamic stiffness method of testing and system - Google Patents
Track dynamic stiffness method of testing and system Download PDFInfo
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- CN106932162A CN106932162A CN201710190696.2A CN201710190696A CN106932162A CN 106932162 A CN106932162 A CN 106932162A CN 201710190696 A CN201710190696 A CN 201710190696A CN 106932162 A CN106932162 A CN 106932162A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/025—Measuring arrangements
Abstract
The embodiment of the present invention provides a kind of track dynamic stiffness method of testing and system.Methods described includes：Apply the exciting force in the range of default excited frequency to rail in Preset Time；The force signal and displacement signal on rail are acquired according to default sample frequency, obtain corresponding force signal sampled point and displacement signal sampled point；Data processing is carried out to the force signal sampled point in default time interval, the corresponding variation relation of the force signal and excited frequency on rail is obtained；Data processing is carried out to the displacement signal sampled point in default time interval, the corresponding variation relation of the displacement signal and excited frequency on rail is obtained；According to the force signal on rail, displacement signal and the corresponding variation relation of excited frequency, the dynamic stiffness of track and the corresponding variation relation of excited frequency are obtained.The accuracy of measurement of the track dynamic stiffness method of testing and system is high, and dynamic stiffness value that can be comprehensively to track under different vibration frequencies is measured.
Description
Technical field
The present invention relates to track dynamic stiffness technical field of measurement and test, in particular to a kind of track dynamic stiffness method of testing
And system.
Background technology
Rail track is the critically important vehicles in modern society, and its security is closely bound up with the life of the people,
And the important component of the safety evaluation index as rail track, the dynamic stiffness index of track can substantially reflect railway line
The security on road, wherein, track is typically made up of rail, sleeper, fastener and railway roadbed etc..
Track dynamic stiffness is to be subject to exciting with rail rail level for characterizing the exciting force that rail rail level under dynamic condition is subject to
One important parameter of the relation between the deformation produced after power, embodies the ability that track resists alternate load, also represent
The structural dynamic characteristic of track, is the key factor of the wheel-rail interaction and train operation quality for influenceing train.
For now, usual use can only apply the fatigue machine of the power of fixed numbers frequency to rail force, then pass through
The power that force snesor detection applies, vibration acceleration of the rail under the power is detected by acceleration transducer, whole so as to obtain
The mode of the corresponding dynamic stiffness of individual track, the dynamic stiffness to track is tested.But the accuracy of measurement of this test mode
It is not high, dynamic stiffness of the track under single vibration frequency can only be tested, it is impossible to comprehensively to track under different vibration frequencies
Dynamic stiffness value measure.Therefore, a kind of accuracy of measurement how is provided high, can be comprehensively to track in different vibration frequencies
Under the track dynamic stiffness measuring technology that measures of dynamic stiffness value, be the skill for being badly in need of solving to those skilled in the art
Art problem.
The content of the invention
It is high it is an object of the invention to provide a kind of accuracy of measurement in order to overcome above-mentioned deficiency of the prior art, can
Track dynamic stiffness method of testing and system that comprehensively the dynamic stiffness value to track under different vibration frequencies is measured.
For track dynamic stiffness method of testing, preferred embodiments of the present invention provide a kind of track dynamic stiffness test side
Method.The track dynamic stiffness method of testing is applied to track stiffness test system, and the system includes that excitational equipment, power are sensed
Device, displacement transducer, data acquisition device and computing device.Methods described includes：
The excitational equipment applies the exciting force in the range of default excited frequency in Preset Time to rail, so that described
Rail vibrates, and produces corresponding displacement；
The data acquisition device is by the force snesor and institute's displacement sensors according to default sample frequency point
Other force signal and displacement signal on rail is acquired, and obtains corresponding force signal sampled point and corresponding displacement signal is adopted
Sampling point；
The force signal in default time interval that the computing device is collected to the data acquisition device
Sampled point carries out data processing, obtains the corresponding variation relation of the force signal and excited frequency on rail；
The letter of the displacement in default time interval that the computing device is collected to the data acquisition device
Number sampled point carries out data processing, obtains the corresponding variation relation of the displacement signal and excited frequency on rail；
The computing device is according to the displacement on the variation relation corresponding with excited frequency of the force signal on rail and rail
Signal and the corresponding variation relation of excited frequency, obtain the dynamic stiffness of track and the corresponding variation relation of excited frequency, so that
Dynamic stiffness value to track under different vibration frequencies.
For track stiffness test system, preferred embodiments of the present invention provide a kind of track dynamic stiffness test system
System.The system includes excitational equipment, force snesor, displacement transducer, data acquisition device and computing device, wherein：
The excitational equipment, for applying the exciting force in the range of default excited frequency to rail in Preset Time, with
The rail is vibrated, corresponding displacement is produced；
The data acquisition device, for being sampled frequently according to default by the force snesor and institute's displacement sensors
Rate is acquired to the force signal and displacement signal on rail respectively, obtains corresponding force signal sampled point and corresponding displacement letter
Number sampled point；
The computing device, for the power in default time interval collected to the data acquisition device
Signal sampling point carries out data processing, obtains the corresponding variation relation of the force signal and excited frequency on rail；
The computing device, for the position in default time interval collected to the data acquisition device
Shifting signal sampled point carries out data processing, obtains the corresponding variation relation of the displacement signal and excited frequency on rail；
The computing device, is additionally operable to according on the variation relation corresponding with excited frequency of the force signal on rail and rail
Displacement signal and the corresponding variation relation of excited frequency, obtain the dynamic stiffness of track and the corresponding variation relation of excited frequency,
So as to obtain dynamic stiffness value of the track under different vibration frequencies.
In terms of existing technologies, preferred embodiments of the present invention are provided track dynamic stiffness method of testing and system tool
There is following beneficial effect：The accuracy of measurement of the track dynamic stiffness method of testing and system is high, can be comprehensively to track not
Measured with the dynamic stiffness value under vibration frequency.Specifically, methods described passes through excitational equipment in Preset Time to rail
Apply the exciting force in the range of default excited frequency, by data acquisition device according to default sample frequency respectively on rail
Force signal and displacement signal be acquired, obtain corresponding force signal sampled point and corresponding displacement signal sampled point, and lead to
Cross computing device carries out data processing to the force signal sampled point and displacement signal sampled point in default time interval, point
The displacement signal not obtained on force signal variation relation corresponding with excited frequency and the rail on rail is right with excited frequency
Variation relation is answered, so as to obtain the dynamic stiffness of track and the corresponding variation relation of excited frequency, realization is shaken to track in different
The measurement of the dynamic stiffness value under dynamic frequency.
To enable the above objects, features and advantages of the present invention to become apparent, present pre-ferred embodiments cited below particularly,
And coordinate appended accompanying drawing, it is described in detail below.
Brief description of the drawings
Technical scheme in order to illustrate more clearly the embodiments of the present invention, below will be attached to what is used needed for embodiment
Figure is briefly described, it will be appreciated that the following drawings illustrate only certain embodiments of the present invention, thus be not construed as it is right
The restriction of scope, for those of ordinary skill in the art, on the premise of not paying creative work, can also be according to this
A little accompanying drawings obtain other related accompanying drawings.
A kind of system composition square frame of the track stiffness test system that Fig. 1 is provided for preferred embodiments of the present invention is illustrated
Figure.
Fig. 2 is a kind of block diagram of the excitational equipment shown in Fig. 1.
The track of the track stiffness test system being applied to shown in Fig. 1 that Fig. 3 is provided for preferred embodiments of the present invention
A kind of schematic flow sheet of dynamic stiffness method of testing.
A kind of schematic flow sheet of the sub-step that Fig. 4 includes for step S230 in Fig. 3.
A kind of schematic flow sheet of the sub-step that Fig. 5 includes for step S240 in Fig. 3.
Icon：10- track stiffness test systems；100- excitational equipments；110- force snesors；120- displacement transducers；
130- data acquisition devices；140- computing devices；150- power supplys；101- signal generators；102- power amplifiers；103- excitings
Device.
Specific embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
A part of embodiment of the present invention, rather than whole embodiments.Present invention implementation generally described and illustrated in accompanying drawing herein
The component of example can be arranged and designed with a variety of configurations.
Therefore, the detailed description of embodiments of the invention below to providing in the accompanying drawings is not intended to limit claimed
The scope of the present invention, but be merely representative of selected embodiment of the invention.Based on the embodiment in the present invention, this area is common
The every other embodiment that technical staff is obtained under the premise of creative work is not made, belongs to the model of present invention protection
Enclose.
It should be noted that：Similar label and letter represents similar terms in following accompanying drawing, therefore, once a certain Xiang Yi
It is defined in individual accompanying drawing, then it need not be further defined and explained in subsequent accompanying drawing.
In the description of the invention, it is necessary to explanation, term " on " indicate orientation or position relationship be based on accompanying drawing
Shown orientation or position relationship, or the orientation usually put when using of the invention product or position relationship, merely to
Be easy to the description present invention and simplify describe, rather than indicate imply signified device or element must have specific orientation,
With specific azimuth configuration and operation, therefore it is not considered as limiting the invention.Additionally, term " first ", " second ",
" 3rd " etc. is only used for distinguishing description, and it is not intended that indicating or implying relative importance.
In the description of the invention, in addition it is also necessary to explanation, unless otherwise clearly defined and limited, term " setting ",
" installation ", " connected ", " connection " should be interpreted broadly, for example, it may be fixedly connected, or be detachably connected, or one
The connection of body ground；Can mechanically connect, or electrically connect；Can be joined directly together, it is also possible to indirect by intermediary
It is connected, can is two connections of element internal.For the ordinary skill in the art, can be with concrete condition understanding
State term concrete meaning in the present invention.
Below in conjunction with the accompanying drawings, some embodiments of the present invention are elaborated.It is following in the case where not conflicting
Feature in embodiment and embodiment can be mutually combined.
Fig. 1 is refer to, is a kind of system group of the track stiffness test system 10 that preferred embodiments of the present invention are provided
Into block diagram.In embodiments of the present invention, the track stiffness test system 10 shakes for test tracks in different
Dynamic stiffness value under dynamic frequency, is evaluated with the security to current orbit, and the track stiffness test system 10 includes
For applying the excitational equipment 100 of the exciting force of different vibration frequencies to the rail in track, for detecting that the power on rail is believed
Number force snesor 110, the displacement transducer 120 for detecting the displacement signal on rail, for by the force snesor
110 and displacement transducer 120 gather the data acquisition device 130 of force signal and displacement signal on rail respectively, for being institute
State the power supply 150 that track stiffness test system 10 provides electric energy, and the power for being collected to the data acquisition device 130
Signal and displacement signal carry out the computing device that data processing obtains dynamic stiffness value of the corresponding track under different vibration frequencies
140。
In the present embodiment, the power supply 150 respectively with the excitational equipment 100, the data acquisition device 130 and institute
State computing device 140 to connect, think that the excitational equipment 100, the data acquisition device 130 and the computing device 140 are carried
Power supply energy.After the excitational equipment 100 receives the electric energy of the offer of the power supply 150, different vibrations are applied to the rail in track
The exciting force of frequency, vibrates the rail, and produce corresponding displacement.The data acquisition device 130 respectively with institute
State force snesor 110 and institute's displacement sensors 120 are connected, the data acquisition device 130 receives the offer of the power supply 150
After electric energy, the force signal and displacement signal on rail are entered respectively by the force snesor 110 and institute's displacement sensors 120
Row collection, obtains corresponding force signal data and displacement signal data.The computing device 140 receives the power supply 150 and provides
Electric energy after, the force signal data and displacement signal data collected to the data acquisition device 130 carry out data processing, obtain
Corresponding variation relation between the dynamic stiffness and vibration frequency of track, so as to obtain the track under different vibration frequencies
Dynamic stiffness value.
In embodiments of the present invention, the excitational equipment 100, for applying default exciting frequently to rail in Preset Time
Exciting force in the range of rate, so that the rail vibrates, produces corresponding displacement.
In the present embodiment, the Preset Time is that the excitational equipment 100 for pre-setting applies exciting force to rail
Time, the default excited frequency scope be pre-set the excitational equipment 100 output exciting force corresponding to swash
The frequency range of vibration frequency.In the present embodiment, the excited frequency corresponding to the exciting force of the output of the excitational equipment 100 can be with
It is a fixed excited frequency value, such as 1Hz, 4Hz or 8Hz；Can also be with frequency sweep in the range of default excited frequency
Form is changed the frequency values for obtaining, such as the corresponding excited frequency of exciting force is in 1Hz~200Hz in excited frequency scope
It is changed in the way of frequency sweep.Particular situation can according to demand carry out different settings.
Specifically, Fig. 2 is refer to, is a kind of block diagram of the excitational equipment 100 shown in Fig. 1.Of the invention real
Apply in example, the excitational equipment 100 includes signal generator 101, power amplifier 102 and vibrator 103.
In the present embodiment, the signal generator 101 is connected with the power amplifier 102, is put with to the power
Detection signal in the range of the big default excited frequency of the output of device 102.Wherein, the detection signal is the signal generator 101
The vibrator 103 is produced the exciting force of corresponding excited frequency the sine or cosine signal for producing, the exciting force
Excited frequency be in the default excited frequency in the range of.
In the present embodiment, the vibrator 103 is connected with the power amplifier 102, occurs to receive the signal
The detection signal of the output of device 101, and produced in the presence of the power amplifier 102 in the range of default excited frequency accordingly
Exciting force.In the present embodiment, the power amplifier 102 can be exported on electric current, voltage to the signal generator 101
Detection signal be amplified treatment, and the detection signal obtained after enhanced processing is passed into the vibrator 103, to drive
The vibrator 103 produces the frequency values mutually corresponding exciting force of excited frequency and the detection signal.
In the present embodiment, the force snesor 110 is connected with the vibrator 103, and the vibrator 103 is produced
Exciting force pass to rail so that the rail vibrates in the presence of the exciting force, produces corresponding displacement.
In embodiments of the present invention, the data acquisition device 130, for by the force snesor 110 and institute's rheme
Displacement sensor 120 is acquired to the force signal and displacement signal on rail respectively according to default sample frequency, obtains correspondence
Force signal sampled point and corresponding displacement signal sampled point.
In the present embodiment, the default sample frequency is adopted for the default data acquisition device 130 carries out data
The frequency of collection, the force signal sampled point be the data acquisition device 130 according to default sample frequency to the power on rail
Signal sample the corresponding point data for obtaining, and institute's displacement signal sampled point is the data acquisition device 130 according to pre-
If sample frequency the displacement signal on rail sample the corresponding point data for obtaining.
In the present embodiment, the force snesor 110 is additionally operable to detect the force signal on the rail, the displacement sensing
Device 120 is connected with the rail, so that when the rail produces displacement, the displacement signal to the rail is detected.It is described
Data acquisition device 130 is by the force snesor 110 and institute's displacement sensors 120 respectively to the force signal on the rail
Data acquisition is carried out with displacement signal.
Specifically, the data acquisition device 130 is to be to be spaced to described with the time corresponding to default sample frequency
The displacement that the exciting force and the rail that rail is subject to are produced in the presence of the exciting force carries out data acquisition, obtains described
Displacement signal sampling corresponding to the displacement signal on force signal sampled point and the rail corresponding to force signal on rail
Point.
In embodiments of the present invention, the computing device 140 is a computer with processor, and the processor may
It is a kind of IC chip with signal handling capacity, on the rail that can be collected to the data acquisition device 130
Force signal and displacement signal carry out data processing, obtain dynamic stiffness value of the track under different vibration frequencies.Above-mentioned place
Reason device can be general processor, including central processing unit (Central Processing Unit, CPU), network processing unit
(Network Processor, NP) etc..Can also be digital signal processor (DSP), application specific integrated circuit (ASIC), ready-made
Programmable gate array (FPGA) or other PLDs, discrete gate or transistor logic, discrete hardware group
Part.Can realize or perform disclosed each method in the embodiment of the present invention, step and logic diagram.General processor can be with
It is microprocessor or the processor can also be any conventional processor etc..
In embodiments of the present invention, the computing device 140, for what is collected to the data acquisition device 130
Force signal sampled point in default time interval carries out data processing, obtains force signal and excited frequency on rail
Correspondence variation relation.Wherein, the default time interval is during to be the excitational equipment 100 apply the time of exciting force to rail
One time slice of interception.
In the present embodiment, the computing device 140 can be adopted to the force signal that the data acquisition device 130 is collected
Sampling point is arranged, and the force signal sampled point collected from the data acquisition device 130 is picked out and can fully show institute
State the force signal sampling of force signal sampled point and the corresponding relation between the sampling time that data acquisition device 130 is collected
Point, wherein, the sampling time is the time corresponding to the default sample frequency.
In the present embodiment, 140 pairs of data acquisition devices 130 of the computing device collect in default
Force signal sampled point in time interval carries out data processing, obtains the change corresponding with excited frequency of the force signal on rail and closes
The mode of system includes：
Intercept the power letter of force signal sampled point that the data acquisition device 130 collects in default time interval
Number sampled point, and force signal sampled point to being truncated to processes, and obtains spectral magnitude precision force signal sampled point higher,
And corresponding force signal sampled point and the corresponding relation between the sampling time；
Corresponding relation by way of frequency-domain analysis to force signal sampled point and between the sampling time carries out Fourier's change
Change, obtain the corresponding variation relation of the force signal and excited frequency on rail.
Specifically, the computing device 140 can be carried in the number by will be provided with the power window of default time interval
According on the force signal sampled point that harvester 130 is collected, the power collected with intercepting the data acquisition device 130 is believed
Number force signal sampled point of the sampled point in default time interval.By the force signal sampled point to being truncated to and corresponding institute
The sampling time stated in default time interval carries out periodic extension treatment, obtains the force signal sampling higher of spectral magnitude precision
Point, and corresponding force signal sampled point and the corresponding relation between the sampling time.Then power is believed by way of frequency-domain analysis
Corresponding relation number between sampled point and sampling time carries out Fourier transformation, obtains force signal and excited frequency on rail
Correspondence variation relation F (f).
In embodiments of the present invention, the computing device 140, for what is collected to the data acquisition device 130
Displacement signal sampled point in default time interval carries out data processing, obtains the displacement signal on rail with exciting frequently
The corresponding variation relation of rate.
The treatment side of the force signal sampled point collected with 140 pairs of data acquisition devices 130 of the computing device
Formula is similar to, and the displacement signal sampled point that the computing device 140 can also be collected to the data acquisition device 130 carries out whole
Manage, and the displacement signal sampled point collected from the data acquisition device 130 is picked out and can fully show that the data are adopted
Displacement signal sampled point and the displacement signal sampled point of the corresponding relation between the sampling time that acquisition means 130 are collected.
In the present embodiment, 140 pairs of data acquisition devices 130 of the computing device collect in default
Displacement signal sampled point in time interval carries out data processing, obtains the displacement signal on rail with excited frequency to strain
The mode of change relation includes：
Intercept the position of displacement signal sampled point that the data acquisition device 130 collects in default time interval
Shifting signal sampled point, and corresponding displacement signal sampled point and the corresponding relation between the sampling time；
Corresponding relation to institute's displacement signal sampled point and between the sampling time carries out trend term Processing for removing, smooth place
Reason and filtering process, obtain precision displacement signal sampled point higher and the relation between the sampling time；
The displacement signal sampled point higher to the precision and the relation between the sampling time by way of frequency-domain analysis
Fourier transformation is carried out, the corresponding variation relation of the displacement signal and excited frequency on rail is obtained.
Specifically, the computing device 140 can will be provided with the window index of default time interval and be carried in the data
On the displacement signal sampled point that harvester 130 is collected, to intercept the displacement that the data acquisition device 130 is collected
Force signal sampled point of the signal sampling point in default time interval.To the displacement signal sampled point that is truncated to and corresponding pre-
If time interval in sampling time carry out periodic extension treatment, obtain corresponding displacement signal sampled point and sampling time it
Between corresponding relation.The corresponding relation correspondingly to institute's displacement signal sampled point and between the sampling time carries out trend term and disappears again
Except treatment, smoothing processing and filtering process, precision displacement signal sampled point higher and the relation between the sampling time are obtained.So
Displacement signal sampled point higher to the precision by way of frequency-domain analysis and the relation between the sampling time carry out Fu afterwards
In leaf transformation, obtain corresponding variation relation z (f) of the displacement signal and excited frequency on rail.
In embodiments of the present invention, the computing device 140, is additionally operable to according to the force signal on rail and excited frequency
Displacement signal and the corresponding variation relation of excited frequency on correspondence variation relation and rail, obtain the dynamic stiffness and exciting of track
The corresponding variation relation of frequency, so as to obtain dynamic stiffness value of the track under different vibration frequencies.
In the present embodiment, the computing device 140 is by corresponding with excited frequency by the force signal on the rail
Displacement signal on variation relation and the rail is divided by with the corresponding variation relation of excited frequency, obtains the track
The corresponding variation relation of dynamic stiffness and excited frequency.Specifically, tabular form can be carried out by equation below：
Wherein, k (f) represents the dynamic stiffness of the track and the corresponding variation relation of excited frequency f, and F (f) represents described sharp
The corresponding variation relation of the exciting force that equipment of shaking 100 applies to rail and excited frequency f, z (f) represents the rail in exciting force
In the presence of the displacement that produces when vibrating and excited frequency f corresponding variation relation.
It is understood that a kind of system composition that the system shown in Fig. 1 is only track stiffness test system 10 is illustrated
Figure, the track stiffness test system 10 may also include component devices more more than shown in Fig. 1 or less, or have
The device configuration different from shown in Fig. 1.Each equipment shown in Fig. 1 can be realized using hardware, software or its combination.
Fig. 3 is refer to, is the track stiffness test system being applied to shown in Fig. 1 that preferred embodiments of the present invention are provided
A kind of schematic flow sheet of 10 track dynamic stiffness method of testing.Below to the tool of the track dynamic stiffness method of testing shown in Fig. 3
Body flow and step are described in detail.
In embodiments of the present invention, the track dynamic stiffness method of testing following steps：
Step S210, excitational equipment 100 applies the exciting force in the range of default excited frequency in Preset Time to rail,
So that the rail vibrates, corresponding displacement is produced.
In the present embodiment, the Preset Time is that the excitational equipment 100 for pre-setting applies exciting force to rail
Time, the default excited frequency scope be pre-set the excitational equipment 100 output exciting force corresponding to swash
The frequency range of vibration frequency.The excitational equipment 100 can be by signal generator 101, power amplifier 102 and vibrator 103
Apply the exciting force in the range of default excited frequency to the rail.Excitational equipments 100 of the step S210 shown in Fig. 1
Perform, the detailed description of the step S210 is referred to specific descriptions above to the excitational equipment 100.
Step S220, data acquisition device 130 is by force snesor 110 and displacement transducer 120 according to default sampling
Frequency is acquired to the force signal and displacement signal on rail respectively, obtains corresponding force signal sampled point and corresponding displacement
Signal sampling point.
In the present embodiment, the force signal sampled point is the data acquisition device 130 according to default sample frequency
To the force signal on rail sample the corresponding point data for obtaining, and institute's displacement signal sampled point is filled for the data acquisition
Put 130 to the displacement signal on rail sample the corresponding point data for obtaining according to default sample frequency.The step
Data acquisition devices 130 of the S220 shown in Fig. 1 is performed, and the detailed description of the step S220 is referred to above to institute
State the specific descriptions of data acquisition device 130.
Step S230,140 pairs of data acquisition devices 130 of computing device collect in default time interval
Interior force signal sampled point carries out data processing, obtains the corresponding variation relation of the force signal and excited frequency on rail.Wherein,
The default time interval is a timeslice of interception in the time that the excitational equipment 100 applies exciting force to rail
Section.
Specifically, Fig. 4 is refer to, is a kind of schematic flow sheet of the sub-step that step S230 includes in Fig. 3, the step
S230 can include：
Sub-step S231, the force signal sampled point that data intercept harvester 130 is collected is in default time interval
Interior force signal sampled point, and force signal sampled point to being truncated to processes, and obtains spectral magnitude precision power letter higher
Number sampled point, and corresponding force signal sampled point and the corresponding relation between the sampling time, wherein, the sampling time is default
The sample frequency corresponding time.
Sub-step S232, the corresponding relation to force signal sampled point and between the sampling time by way of frequency-domain analysis enters
Row Fourier transformation, obtains the corresponding variation relation of the force signal and excited frequency on rail.
In the present embodiment, the computing device 140 can be carried in by will be provided with the power window of default time interval
On the force signal sampled point that the data acquisition device 130 is collected, collected with intercepting the data acquisition device 130
Force signal sampled point of the force signal sampled point in default time interval.The step S230, sub-step S231 and sub-step
Rapid computing devices 140 of the S232 shown in Fig. 1 is performed, and the step S230, sub-step S231 and sub-step S232's is detailed
Description is referred to specific descriptions above to the computing device 140.
Step S240,140 pairs of data acquisition devices 130 of computing device collect in default time interval
Interior displacement signal sampled point carries out data processing, obtains the corresponding variation relation of the displacement signal and excited frequency on rail.
Specifically, Fig. 5 is refer to, is a kind of schematic flow sheet of the sub-step that step S240 includes in Fig. 3, the step
S240 can include：
Sub-step S241, the displacement signal sampled point that the interception data acquisition device 130 is collected is when default
Between displacement signal sampled point in interval, and corresponding displacement signal sampled point and the corresponding relation between the sampling time.
Sub-step S242, the corresponding relation to institute's displacement signal sampled point and between the sampling time carries out trend term elimination
Treatment, smoothing processing and filtering process, obtain precision displacement signal sampled point higher and the relation between the sampling time；
Sub-step S243, the displacement signal sampled point higher to the precision and sampling time by way of frequency-domain analysis
Between relation carry out Fourier transformation, obtain the corresponding variation relation of the displacement signal and excited frequency on rail.
In the present embodiment, the computing device 140 can be loaded by will be provided with the window index of default time interval
On the displacement signal sampled point that the data acquisition device 130 is collected, gathered with intercepting the data acquisition device 130
Force signal sampled point of the displacement signal sampled point for obtaining in default time interval.The step S240, sub-step S241,
The computing device 140 of sub-step S242 and sub-step S243 shown in Fig. 1 is performed, the step S240, sub-step S241, son
The detailed description of step S242 and sub-step S243 is referred to specific descriptions above to the computing device 140.
Step S250, computing device 140 is according to the variation relation corresponding with excited frequency of the force signal on rail and rail
On displacement signal and excited frequency corresponding variation relation, obtain track dynamic stiffness it is corresponding with excited frequency change close
System, so as to obtain dynamic stiffness value of the track under different vibration frequencies.
In the present embodiment, the computing device 140 is by corresponding with excited frequency by the force signal on the rail
Displacement signal on variation relation and the rail is divided by with the corresponding variation relation of excited frequency, obtains the track
The corresponding variation relation of dynamic stiffness and excited frequency.
In sum, in the track dynamic stiffness method of testing and system that preferred embodiments of the present invention are provided, the rail
The accuracy of measurement of road dynamic stiffness method of testing and system is high, dynamic stiffness value that can comprehensively to track under different vibration frequencies
Measure.Specifically, methods described is applied in the range of default excited frequency in Preset Time by excitational equipment to rail
Exciting force, the force signal and displacement signal on rail are carried out respectively according to default sample frequency by data acquisition device
Collection, obtains corresponding force signal sampled point and corresponding displacement signal sampled point, and by computing device in default
Force signal sampled point and displacement signal sampled point in time interval carry out data processing, respectively obtain force signal on rail with
The corresponding variation relation of displacement signal on the corresponding variation relation and rail of excited frequency and excited frequency, so as to obtain track
Dynamic stiffness and excited frequency corresponding variation relation, realize the survey of dynamic stiffness value to track under different vibration frequencies
Amount.
The preferred embodiments of the present invention are the foregoing is only, is not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.It is all within the spirit and principles in the present invention, made any repair
Change, equivalent, improvement etc., should be included within the scope of the present invention.
Claims (10)
1. a kind of track dynamic stiffness method of testing, is applied to track stiffness test system, and the system includes excitational equipment, power
Sensor, displacement transducer, data acquisition device and computing device, it is characterised in that methods described includes：
The excitational equipment applies the exciting force in the range of default excited frequency in Preset Time to rail, so that the rail
Vibrate, produce corresponding displacement；
The data acquisition device is right respectively according to default sample frequency by the force snesor and institute's displacement sensors
Force signal and displacement signal on rail are acquired, and obtain corresponding force signal sampled point and the sampling of corresponding displacement signal
Point；
The sampling of the force signal in default time interval that the computing device is collected to the data acquisition device
Point carries out data processing, obtains the corresponding variation relation of the force signal and excited frequency on rail；
The computing device is adopted to the displacement signal in default time interval that the data acquisition device is collected
Sampling point carries out data processing, obtains the corresponding variation relation of the displacement signal and excited frequency on rail；
The computing device is according to the displacement signal on the variation relation corresponding with excited frequency of the force signal on rail and rail
With the corresponding variation relation of excited frequency, the dynamic stiffness of track and the corresponding variation relation of excited frequency are obtained, so as to obtain rail
Dynamic stiffness value of the road under different vibration frequencies.
2. method according to claim 1, it is characterised in that the computing device is gathered to the data acquisition device
To the force signal sampled point in default time interval carry out data processing, obtain force signal on rail with exciting frequently
The step of corresponding variation relation of rate, includes：
Intercept the force signal sampling of force signal sampled point that the data acquisition device collects in default time interval
Point, and force signal sampled point to being truncated to processes, and obtains spectral magnitude precision force signal sampled point higher, and accordingly
Force signal sampled point and the corresponding relation between the sampling time, wherein, the sampling time be the default sample frequency
The corresponding time；
Corresponding relation by way of frequency-domain analysis to force signal sampled point and between the sampling time carries out Fourier transformation, obtains
The corresponding variation relation of force signal on to rail and excited frequency.
3. method according to claim 2, it is characterised in that the power that the interception data acquisition device is collected
The step of force signal sampled point of the signal sampling point in default time interval, includes：
The power window that default time interval will be provided with is carried in the force signal sampled point that the data acquisition device is collected
On, sampled with intercepting the force signal of force signal sampled point that the data acquisition device collects in default time interval
Point.
4. method according to claim 1, it is characterised in that the computing device is gathered to the data acquisition device
To the displacement signal sampled point in default time interval carry out data processing, obtain displacement signal on rail and swash
The step of corresponding variation relation of vibration frequency, includes：
Intercept the displacement signal of displacement signal sampled point that the data acquisition device collects in default time interval
Sampled point, and corresponding displacement signal sampled point and the corresponding relation between the sampling time, wherein, the sampling time is described
The default sample frequency corresponding time；
Corresponding relation to institute's displacement signal sampled point and between the sampling time carry out trend term Processing for removing, smoothing processing and
Filtering process, obtains precision displacement signal sampled point higher and the relation between the sampling time；
The displacement signal sampled point higher to the precision and the relation between the sampling time are carried out by way of frequency-domain analysis
Fourier transformation, obtains the corresponding variation relation of the displacement signal and excited frequency on rail.
5. method according to claim 4, it is characterised in that the position that the interception data acquisition device is collected
The step of displacement signal sampled point of the shifting signal sampled point in default time interval, includes：
The window index that default time interval will be provided with is carried in the displacement signal that the data acquisition device collects and adopts
On sampling point, believed with intercepting the power of displacement signal sampled point that the data acquisition device collects in default time interval
Number sampled point.
6. method according to claim 1, it is characterised in that the computing device is according to the force signal and exciting on rail
Displacement signal and the corresponding variation relation of excited frequency on the corresponding variation relation and rail of frequency, obtain the dynamic stiffness of track
With the corresponding variation relation of excited frequency, so as to include the step of obtaining dynamic stiffness value of the track under different vibration frequencies：
By displacement signal and exciting on the variation relation corresponding with excited frequency of the force signal on the rail and the rail
The corresponding variation relation of frequency is divided by, and obtains the dynamic stiffness of the track and the corresponding variation relation of excited frequency.
7. method according to claim 6, it is characterised in that the dynamic stiffness of track change corresponding with excited frequency
Relation is expressed as follows with formula：
Wherein, k (f) represents the dynamic stiffness of the track and the corresponding variation relation of excited frequency f, and F (f) represents the exciting and sets
The corresponding variation relation of the standby exciting force applied to rail and excited frequency f, z (f) represents effect of the rail in exciting force
The corresponding variation relation of the lower displacement produced when vibrating and excited frequency f.
8. a kind of track stiffness test system, it is characterised in that the system includes that excitational equipment, force snesor, displacement are passed
Sensor, data acquisition device and computing device, wherein：
The excitational equipment, for applying the exciting force in the range of default excited frequency to rail in Preset Time, so that institute
State rail to vibrate, produce corresponding displacement；
The data acquisition device, for being divided according to default sample frequency by the force snesor and institute's displacement sensors
Other force signal and displacement signal on rail is acquired, and obtains corresponding force signal sampled point and corresponding displacement signal is adopted
Sampling point；
The computing device, for the force signal in default time interval collected to the data acquisition device
Sampled point carries out data processing, obtains the corresponding variation relation of the force signal and excited frequency on rail；
The computing device, for the letter of the displacement in default time interval collected to the data acquisition device
Number sampled point carries out data processing, obtains the corresponding variation relation of the displacement signal and excited frequency on rail；
The computing device, is additionally operable to according to the position on the variation relation corresponding with excited frequency of the force signal on rail and rail
Shifting signal and the corresponding variation relation of excited frequency, obtain the dynamic stiffness of track and the corresponding variation relation of excited frequency, so that
Obtain dynamic stiffness value of the track under different vibration frequencies.
9. system according to claim 8, it is characterised in that the excitational equipment includes signal generator, power amplification
Device and vibrator；
The signal generator is connected with the power amplifier, with to the default excited frequency scope of power amplifier output
Interior detection signal；
The vibrator is connected with the power amplifier, to receive the detection signal that the signal generator is exported, and in institute
State the corresponding exciting force preset in the range of excited frequency of generation in the presence of power amplifier.
10. system according to claim 9, it is characterised in that
The force snesor is connected with the vibrator, the exciting force that the vibrator is produced is passed into rail, and detect
Force signal on the rail；
Institute's displacement sensors are connected with the rail, to detect the displacement signal of the rail；
The data acquisition device is connected with the force snesor and institute's displacement sensors respectively, to gather the rail respectively
On force signal and displacement signal.
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| CN110987678A (en) * | 2019-12-17 | 2020-04-10 | 西南交通大学 | Fastener system fatigue test method |
| 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 |
| CN114088326A (en) * | 2021-11-30 | 2022-02-25 | 洛阳双瑞橡塑科技有限公司 | Vibration excitation system and method for testing vibration of road bed plate |
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