CN102183363A - Dynamic characteristic parameter test device and method of sliding guide rail junction surface - Google Patents
Dynamic characteristic parameter test device and method of sliding guide rail junction surface Download PDFInfo
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- CN102183363A CN102183363A CN 201010622646 CN201010622646A CN102183363A CN 102183363 A CN102183363 A CN 102183363A CN 201010622646 CN201010622646 CN 201010622646 CN 201010622646 A CN201010622646 A CN 201010622646A CN 102183363 A CN102183363 A CN 102183363A
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Abstract
The invention relates to a dynamic characteristic parameter test device of a sliding guide rail junction surface, which can be simplified into a single degree of freedom system. The device comprises a base, an installation platform, a fixed guide rail, a wedge-shaped block, an inlaid strip, a sliding block, a plurality of piezoelectric type acceleration sensors, a vibration exciter, an elastic rope, an impedance head, a stand, a normal force applying bolt, a rubber ring, a charge amplifier, a data acquisition unit, a power amplifier and an electronic computer. Compared with the prior art, the dynamic characteristic parameter test device has the advantages that: the structure is compact, the test principle is distinct, dynamic characteristic parameters of the junction surface under different load states can be measured by adjusting the pretightening force of a normal force applying bolt, the vibration exciting force direction passes through the gravity of the sliding block during measurement so that vibration signals of the sliding block and the base can be measured simultaneously, the influence of the vibration signals of the base is eliminated when a frequency response function of a system is calculated, and the characteristics of high efficiency, high stability and high precision are achieved.
Description
Technical field
The present invention relates to a kind of Machine Joint Surfaces dynamic characteristic parameter proving installation and method of testing thereof, particularly a kind of rail plate faying face dynamic characteristic parameter proving installation and method of testing thereof.
Background technology
In physical construction, there are all kinds of Machine Joint Surfaces in a large number, the contact stiffness of these faying faces and damping pointed out such as people such as Burdekin that the contact stiffness of faying face accounted for 60～80% of lathe global stiffness in the lathe to the performance important influence of physical construction in 1979 in research paper.Therefore, accurately obtaining the Machine Joint Surfaces dynamic characteristic parameter is the basic assurance of carrying out physical construction overall dynamics specificity analysis.At present, though set up the various kinetic models of Machine Joint Surfaces, also there is certain difficulty in obtaining of basic dynamic characteristic parameter (as rigidity, damping etc.).Rail plate is the functional part of the outstanding middle widespread use of lathe, the be slidingly connected mechanical characteristic integrally-built weak link of lathe often of face, it is significant therefore to invent the rail plate faying face dynamic characteristic parameter proving installation that a kind of test philosophy is correct, mechanism is simple and measuring accuracy is high.
Document 1: Zhang Guangpeng, topaz U.S..The dynamic perfromance analytic method and the application thereof of machine tool guideway joint portion, mechanical engineering journal, 2002 (10), 38 (10): 114～117.Proposed basic characteristic parameter, set up the kinetic model of guiding rail joint portion, the analytic method of the dynamic perfromance of research lathe guiding rail joint portion based on faying face.Try to achieve guide rail faying face dynamic characteristic parameter though analytical method can be more convenient, must possess more accurate Basic Characteristic Parameters of Joint Surfaces, and rail plate faying face contact condition complexity, influence factor is more, therefore lacks the precision guarantee.
Summary of the invention
Technical matters solved by the invention is to provide a kind of and has that test philosophy is correct, mechanism design is simple, measuring accuracy is high and the rail plate faying face dynamic characteristic parameter proving installation of characteristics such as energy measurement normal direction dynamic characteristic parameter.
The technical solution that realizes the object of the invention is: a kind of rail plate faying face dynamic characteristic parameter proving installation, comprise measuring table, charge amplifier, data acquisition unit, power amplifier, robot calculator, described measuring table comprises pedestal, mounting platform, fixed guide, wedge, panel, slide block, some piezoelectric acceleration transducers, vibrator, elastic threads, reluctance head, shelf, normal direction application of force bolt and rubber ring;
Mounting platform is positioned at the top of pedestal, fixed guide is connected on the mounting platform, this fixed guide compresses the location by wedge, rectangular shaped slider is set on the fixed guide, this slide block is adjusted sideshake by panel, normal direction application of force bolt is pressed on slide block on the mounting platform, between normal direction application of force bolt and the slide block rubber ring is set, vibrator hangs on the top of the shelf by elastic threads, the front end of vibrator connects reluctance head, when measuring, reluctance head connects threaded hole by double-screw bolt and connects with normal direction on the slide block, described normal direction connects the center that threaded hole is positioned at the slide block upper surface, piezoelectric acceleration transducer is installed in respectively on slide block and the fixed guide by magnetic head, the force signal output terminal of reluctance head links to each other with the input end of charge amplifier with the piezoelectric acceleration transducer output terminal, the charge amplifier output terminal links to each other with the data acquisition unit input end, the USB port of data acquisition unit links to each other by the usb data line with robot calculator, the input end of power amplifier links to each other with the output terminal of data acquisition unit, and the output terminal of power amplifier links to each other with the input end of vibrator.
A kind of measuring method of rail plate faying face dynamic characteristic parameter proving installation may further comprise the steps:
Step 1: rail plate, slide block, normal direction application of force bolt are installed, fixed guide to be measured is connected on the mounting platform by bolt, moving slider is to the measuring position then, adjust sideshake by panel, install normal direction application of force bolt at last, on the bolt of exerting pressure, add rubber ring, regulate normal direction application of force bolt pretightening by torque spanner during measurement the rail plate faying face is applied normal load;
Step 2: piezoelectric acceleration transducer, vibrator and reluctance head are installed, are measured when being slidingly connected face normal direction dynamic perfromance and lay piezoelectric acceleration transducer at slide block and fixed guide upper surface; When measuring the faying face normal stiffness reluctance head is installed in normal direction and connects on the threaded hole, then vibrator is connected on the reluctance head by push rod;
Step 3: to the connection of other proving installation, with piezoelectric acceleration transducer, vibrator, reluctance head, charge amplifier, data acquisition unit, power amplifier and robot calculator link up the formation whole test system with corresponding data line, the force signal output terminal that is reluctance head links to each other with the input end of charge amplifier with the piezoelectric acceleration transducer output terminal, the charge amplifier output terminal links to each other with the data acquisition unit input end, the USB port of data acquisition unit links to each other by the usb data line with robot calculator, the input end of power amplifier links to each other with the output terminal of data acquisition unit, and the output terminal of power amplifier links to each other with the input end of vibrator;
Step 4: test parameter setting, Vibration on Start-up and dynamic signal acquisition analytic system in robot calculator, carry out modeling and relevant parameters setting, determine swept frequency range, the charge amplifier enlargement factor, the electric current of power amplifier and voltage, acceleration transducer and reluctance head force transducer correction factor;
Step 5: begin to measure, preserve test figure;
Step 6: test findings is handled and is analyzed, after measure finishing, test findings is handled and judged, investigate system's vibration shape, see and whether satisfy testing requirements, if system's vibration shape meets the demands, then this time measure effectively, preserve test figure, carry out next step calculating, if the vibration shape does not meet the demands, after then turning back to step 1 and changing measurement parameter again, check that each rig for testing is whether normal, test again;
Step 7: the bridge plate frequency response function X (ω) and rail plate frequency response function Y (ω) data that measure according to step 6, in Matlab7.0, calculate equivalent single-mode system frequency response function H (ω), so just can obtain the rigidity k and the damping c of the rail plate faying face of surveying according to formula (6) and formula (7).
Principle of the present invention is: the physical construction that rail plate is installed is a many-degrees of freedom system, and adopt the many-degrees of freedom system theory to test very difficulty of faying face dynamic characteristic parameter, therefore when design rail plate faying face dynamic characteristic parameter proving installation, it is simplified to single-mode system.Proving installation mainly is to be made of pedestal and rail plate pair, and design concept is: (1) rail plate self slide block has big rigidity, and the mode sliding block that causes at the face that is slidingly connected does not produce moderate finite deformation; (2) appropriate design slide block structure can both obtain the steady vibration shape on the exciting force direction when slide block is encouraged.Proving installation just can be reduced to single-mode system like this, and for single-mode system, system stiffness and damping can be asked for by formula (1):
Wherein m is a mass of system, ω
nBe system frequency, ξ is a damping ratio.Just can calculate system stiffness and damping, i.e. rolling guide faying face rigidity and damping as long as therefore test out the natural frequency and the damping ratio of system according to formula (1).
The present invention compared with prior art, its remarkable advantage is: (1) is reduced to the complexity that single-mode system greatly reduces test with proving installation, and proving installation is simple, obtains faying face dynamic characteristic test signal easily accurately; (2) proving installation is carried out the normal direction excitation, can accurately obtain this rail plate faying face normal direction dynamic characteristic parameter; The exciting force direction is by its center of gravity when (3) carrying out the normal direction excitation at slide block upper surface center.Like this when excitation, slide block all can obtain the steady vibration shape on the exciting force direction, has avoided reversing and the vibration shape such as rollover, has improved the accuracy of parameter recognition; When (4) testing basic displacement is eliminated, made measurement model more realistic, test result is more accurate.
Description of drawings
Fig. 1 is a rail plate faying face dynamic characteristic parameter proving installation overall construction drawing of the present invention.
Fig. 2 is the subssembly drawing of worktable of the present invention.
Fig. 3 is test system structure figure of the present invention.
Fig. 4 is simple harmonic quantity excitation of the present invention single-degree-of-freedom vibration principle figure down, and wherein figure (a) does the simple harmonic oscillation illustraton of model for the basis, and figure (b) is mass force analysis figure.
Fig. 5 is the bending vibation mode picture of test case of the present invention.
Fig. 6 is test signal phase place of the present invention and amplitude figure, and wherein figure (a) is amplitude figure, and figure (b) is a phase diagram.
Embodiment
A kind of rail plate faying face dynamic characteristic parameter proving installation, comprise measuring table, charge amplifier 14, data acquisition unit 15, power amplifier 16, robot calculator 17, described measuring table comprises pedestal 1, mounting platform 2, fixed guide 3, wedge 4, panel 5, slide block 6, some piezoelectric acceleration transducers 7, vibrator 8, elastic threads 9, reluctance head 10, shelf 11, normal direction application of force bolt 12 and rubber ring 13;
Particularly, pedestal 1 is to be in the same place by a plurality of Bolt Connection by two whole ironcastings with mounting platform 2, and fixed guide 3 specifications can be carried out the selection of certain limit according to measurement requirement.Fixed guide 3 is connected in to be installed on the base plate 2, and slide block 6 is fixed by panel 4 and application of force bolt 12 and is connected with fixed guide 3, passes through normal direction application of force bolt 12 imposed loads between slide block 6 and the mounting platform 2.Vibrator 8 is suspended on the shelf 11 by elastic threads 9, and reluctance head 10 links to each other with vibrator 8 by push rod, links by normal direction connection threaded hole and slide block 6 during the normal direction exciting of other end.Piezoelectric acceleration transducer 7 is installed in respectively on slide block 6 and the fixed guide 3 by magnetic head, and 15 piezoelectric acceleration transducers 7 are installed on the slide block 6, and 8 piezoelectric acceleration transducers 7 are installed on the fixed guide 3.Slide block 6 is by calculating the intersection point place that its design of centre of gravity is connected the threaded hole axis and the face that is slidingly connected in normal direction.
The force signal output terminal of above-mentioned reluctance head 10 links to each other with b with the input end a of charge amplifier 14 respectively with piezoelectric acceleration transducer 7 output terminals, charge amplifier 14 output terminal c link to each other with data acquisition unit 15 input ends, generally the force signal with reluctance head 10 inserts charge amplifier 14 first passages, and piezoelectric acceleration transducer 6 output signals insert 2～24 passages respectively, wherein charge amplifier 14 is 4 passages, 6 of quantity, data acquisition unit 15 is 32 passages.The port f of data acquisition unit 15 links to each other by the usb data line with robot calculator 17, the port f of data acquisition unit 15 both can receive the signal of robot calculator 17, the signal of gathering can be transferred to robot calculator 17 again and handle, finish the interactive function of acquired signal and operational order.The output port d of data acquisition unit 15 links to each other with the input end of power amplifier 16, the swept-frequency signal that robot calculator 17 sends can be transferred to power amplifier 16, the output terminal e of power amplifier 16 links to each other with the input end of vibrator 8, vibrator 8 can receive the swept-frequency signal from power amplifier 16, thereby 8 pairs of slide blocks 6 of control vibrator encourage.
In conjunction with Fig. 1 and Fig. 2, the ultimate principle of rail plate faying face dynamic characteristic parameter device for quick testing is based on single free oscillating system, regard mounting platform 2 and fixed guide integral body as basis, slide block 6 is regarded mass as, and regards faying face stiffness and damping between slide block and fixed guide as elasticity and damping element.System under the effect of harmonic excitation power, mounting platform 2 and slide block 6 on the vibration shape, show as translation and do not produce reverse, distortion such as bending.
In conjunction with Fig. 4, ultimate principle of the present invention is described, for the vibrational system that constitutes by basis-spring-damper-quality,, mass m does the time spent when being subjected to harmonic excitation power f, and its vibration equation can be expressed as formula (2):
M is a component quality in the formula, and formula (2) is done to constitute the single-degree of freedom vibration equation with down conversion:
Do the time spent when vibrational system is subjected to the simple harmonic quantity exciting force, simple harmonic oscillation all will take place in m and pedestal, therefore can establish f (t)=F (ω) e
I ω t, x (t)=X (ω) e
I ω t, y (t)=Y (ω) e
I ω t, above three substitution formulas (3) can be got formula (4):
The system frequency response function of order is H (ω)=(m ω
2+ j ω c+k)
-1, basic frequency response function H
Y(ω)=Y (ω)/F (ω), m and basic frequency response function phasor difference H (ω)=(m ω
2+ j ω c+k)
-1, then formula (4) can be expressed as formula (5):
H in the formula
X-Y(ω) be m frequency response function and basic frequency response function phasor difference, H
Y(ω) be basic frequency response function.H
X-Y(ω) and H
Y(ω) can be by measuring.Obtain the frequency response function of equivalent single-mode system like this according to formula (5), identify its natural frequency f then
n, then dynamic stiffness is:
Damping c
EqCan adopt half-power bandwidth method to ask for according to the frequency response function H of system (ω) that obtains:
c
eq＝2πmΔf (7)
Δ f is a half-power bandwidth in the formula.
Below in conjunction with Fig. 1-3, a kind of rail plate faying face dynamic characteristic parameter method of testing of the present invention is described, concrete steps are as follows:
Step 1: rolling guide 3, slide block 6, normal direction application of force bolt 12 are installed.With fixed guide to be measured 3 by Bolt Connection on mounting platform 2, moving slider 6 is to the measuring position then, adjust sideshake by panel 4, install normal direction application of force bolt 12 at last, in order to reduce bolt to measuring the influence of rigidity, on the bolt of exerting pressure, add rubber ring 13, regulate normal direction application of force bolt 12 pretightning forces by torque spanner during measurement the rail plate faying face is applied normal load;
Step 2: piezoelectric acceleration transducer 7, vibrator 8 and reluctance head 10 are installed.When being slidingly connected face normal direction dynamic perfromance, measurement rationally places piezoelectric acceleration transducer 7 at slide block 6 and fixed guide 3 upper surfaces; When measuring the faying face normal stiffness reluctance head 10 is installed in normal direction and connects on the threaded hole, then vibrator 8 is connected on the reluctance head 10 by push rod; The quantity of the piezoelectric acceleration transducer of placing on slide block 67 is 15, and the quantity of placing piezoelectric acceleration transducer 7 on rolling guide 3 is 8.
Step 3: to the connection of other proving installation, with piezoelectric acceleration transducer 7, vibrator 8, reluctance head 10, charge amplifier 14, data acquisition unit 15, power amplifier 16 and the corresponding data line of robot calculator 17 usefulness link up the formation whole test system, the force signal output terminal that is reluctance head 10 links to each other with the input end of charge amplifier 14 with piezoelectric acceleration transducer 7 output terminals, charge amplifier 14 output terminals link to each other with data acquisition unit 15 input ends, the USB port of data acquisition unit 15 links to each other by the usb data line with robot calculator 17, the input end of power amplifier 16 links to each other with the output terminal of data acquisition unit 15, and the output terminal of power amplifier 16 links to each other with the input end of vibrator 8;
Step 4: test parameter setting.In robot calculator 17, start, carry out modeling and relevant parameters setting by vibration and dynamic signal acquisition analytic system.Determine swept frequency range, charge amplifier enlargement factor, the electric current of power amplifier and voltage, acceleration transducer and reluctance head force transducer correction factor etc.;
Step 5: begin to measure, preserve test figure;
Step 6: test findings is handled and is analyzed, after measure finishing, test findings is handled and judged, investigate system's vibration shape, see and whether satisfy testing requirements, if system's vibration shape meets the demands, then this time measure effectively, preserve test figure, carry out next step calculating, if the vibration shape does not meet the demands, after then turning back to step 1 and changing measurement parameter again, check that each rig for testing is whether normal, test again;
Step 7: the bridge plate frequency response function X (ω) and rolling guide frequency response function Y (ω) data that measure according to step 6, in Matlab7.0, calculate equivalent single-mode system frequency response function H (ω), so just can obtain the rigidity k and the damping c of institute's survey rolling guide faying face according to formula (6) and formula (7).The required formula of calculated rigidity k is
Calculating the used formula of damping c is c=2m ω
nζ, m is the quality of slide block 6 in the described formula, ω
nBe system frequency, ξ is a damping ratio.
Below in conjunction with embodiment the present invention is done further detailed description:
Adopting the method that proposes among the present invention to rectangle---the rail plate faying face of rectangle cooperation 420mm * 110mm is depressed the normal direction dynamic characteristic parameter at the 0.1MPa face and is tested.Concrete testing procedure is as follows:
(1) rail plate, slide block, normal direction application of force bolt are installed.Install rail plate, slide block, normal direction application of force bolt by step 1 above, adopt torque spanner to regulate normal direction application of force bolt torque to predetermined value, each normal direction application of force bolt imposed load is 16.6Nm in this test.
(2) piezoelectric acceleration transducer, vibrator and reluctance head are installed, and piezoelectric acceleration transducer, vibrator, reluctance head, charge amplifier, data acquisition unit, power amplifier and robot calculator linked up with corresponding data line, this experimental measurement be the normal direction dynamic perfromance, therefore reluctance head connects threaded hole with the normal direction of bridge plate and links, and vibrator carries out exciting in normal direction to bridge plate.
(3) machinery and Constructional Modal Analysis MaCras module among Vibration on Start-up and the dynamic signal acquisition analytic system V7.1 are carried out modeling and measurement parameter setting.Energisation mode is sine sweep excitation and dynamometry, carries out Geometric Modeling then, and correction factor, engineering unit, path marking, fft block size, average time, time window processing function, analysis frequency etc. are set in measurement parameter.This measures sine sweep, and frequency range is made as 100Hz～600Hz, and sweep spacing is 2Hz.
(4) connect the power supply of each surveying instrument, begin to measure the acquisition test data.
(5) after measurement finishes, in vibration and dynamic signal acquisition analytic system V7.1, handle, by operations such as model frequency initial estimation, direction of measurement processing, equation of constraint processing, Mode Shape normalizing and observation vibration shape animations, can clearly reflect the effect of this measurement.
Fig. 5 is the bending vibation mode picture of this measurement, this measurement obtains the comparatively stable translation vibration shape at the 368Hz place as seen from the figure, Fig. 6 is for calculating phase place and the amplitude figure of equivalent single-mode system frequency response function H (ω) through formula (5), it is typical single-degree of freedom vibration that Fig. 6 is reflected in the interior system of this frequency range, further specifies accuracy and reliability that the present invention tests rolling guide faying face dynamic characteristic parameter thus.
(6) obtain according to formula (6) and formula (7) that rolling guide faying face normal direction dynamic characteristic parameter rigidity and damping are respectively 7.484 * 10 in this test
8N/m
3With 8.08 * 10
4Ns/m
3Then under this operating mode, the equivalent stiffness of unit area rail plate is 8.1 * 10
9N/m
3, the unit area equivalent damping is 8.75 * 10
5Ns/m
3
By top concrete test example, the method among employing the present invention has realized the measurement of rail plate faying face dynamic characteristic parameter.
Claims (8)
1. rail plate faying face dynamic characteristic parameter proving installation, it is characterized in that, comprise measuring table, charge amplifier [14], data acquisition unit [15], power amplifier [16], robot calculator [17], described measuring table comprises pedestal [1], mounting platform [2], fixed guide [3], wedge [4], panel [5], slide block [6], some piezoelectric acceleration transducers [7], vibrator [8], elastic threads [9], reluctance head [10], shelf [11], normal direction application of force bolt [12] and rubber ring [13];
Mounting platform [2] is positioned at the top of pedestal [1], fixed guide [3] is connected on the mounting platform [2], this fixed guide compresses the location by wedge [4], rectangular shaped slider [6] is set on the fixed guide [3], this slide block is adjusted sideshake by panel [5], normal direction application of force bolt [12] is pressed on slide block [6] on the mounting platform [2], between normal direction application of force bolt [12] and the slide block [6] rubber ring [13] is set, vibrator [8] is suspended on the shelf [11] by elastic threads [9], the front end of vibrator [8] connects reluctance head [10], when measuring, reluctance head connects threaded hole by double-screw bolt and connects with normal direction on the slide block [6], described normal direction connects the center that threaded hole is positioned at slide block [6] upper surface, piezoelectric acceleration transducer [7] is installed in respectively on slide block [6] and the fixed guide [3] by magnetic head, the force signal output terminal of reluctance head [10] links to each other with the input end of charge amplifier [14] with piezoelectric acceleration transducer [7] output terminal, charge amplifier [14] output terminal links to each other with data acquisition unit [15] input end, the USB port of data acquisition unit [15] links to each other by the usb data line with robot calculator [17], the input end of power amplifier [16] links to each other with the output terminal of data acquisition unit [15], and the output terminal of power amplifier [16] links to each other with the input end of vibrator [8].
2. rail plate faying face dynamic characteristic parameter proving installation according to claim 1 is characterized in that slide block [6] center of gravity is the intersection point of normal direction exciting force direction and faying face.
3. rail plate faying face dynamic characteristic parameter proving installation according to claim 1, it is characterized in that, the quantity of normal direction application of force bolt [12] is 2, the line of described two normal direction application of force bolts [12] is parallel with the guide rail direction, and the center of line is positioned at the center of slide block [6] upper surface.
4. according to claim 1,2 or 3 described rail plate faying face dynamic characteristic parameter proving installations, it is characterized in that the prefastening torque of the normal direction application of force bolt [12] of connection slide block [6] and mounting platform [2] is adjustable.
5. according to claim 1,2 or 3 described rail plate faying face dynamic characteristic parameter proving installations, it is characterized in that, the quantity of the piezoelectric acceleration transducer [7] on the slide block [6] is 15, and the quantity that rolling guide [3] is gone up piezoelectric acceleration transducer [7] is 8.
6. the measuring method based on the described rail plate faying face of claim 1 dynamic characteristic parameter proving installation is characterized in that, may further comprise the steps:
Step 1: rail plate [3], slide block [6], normal direction application of force bolt [12] are installed, fixed guide to be measured [3] is connected on the mounting platform [2] by bolt, moving slider [6] is to the measuring position then, adjust sideshake by panel [4], install normal direction application of force bolt [12] at last, on the bolt of exerting pressure, add rubber ring [13], regulate normal direction application of force bolt [12] pretightning force by torque spanner during measurement the rail plate faying face is applied normal load;
Step 2: piezoelectric acceleration transducer [7], vibrator [8] and reluctance head [10] are installed, are measured when being slidingly connected face normal direction dynamic perfromance and lay piezoelectric acceleration transducer [7] at slide block [6] and fixed guide [3] upper surface; When measuring the faying face normal stiffness reluctance head [10] is installed in normal direction and connects on the threaded hole, then vibrator [8] is connected on the reluctance head [10] by push rod;
Step 3: to the connection of other proving installation, with piezoelectric acceleration transducer [7], vibrator [8], reluctance head [10], charge amplifier [14], data acquisition unit [15], power amplifier [16] and robot calculator [17] link up the formation whole test system with corresponding data line, the force signal output terminal that is reluctance head [10] links to each other with the input end of charge amplifier [14] with piezoelectric acceleration transducer [7] output terminal, charge amplifier [14] output terminal links to each other with data acquisition unit [15] input end, the USB port of data acquisition unit [15] links to each other by the usb data line with robot calculator [17], the input end of power amplifier [16] links to each other with the output terminal of data acquisition unit [15], and the output terminal of power amplifier [16] links to each other with the input end of vibrator [8];
Step 4: test parameter setting, Vibration on Start-up and dynamic signal acquisition analytic system in robot calculator [17], carry out modeling and relevant parameters setting, determine swept frequency range, the charge amplifier enlargement factor, the electric current of power amplifier and voltage, acceleration transducer and reluctance head force transducer correction factor;
Step 5: begin to measure, preserve test figure;
Step 6: test findings is handled and is analyzed, after measure finishing, test findings is handled and judged, investigate system's vibration shape, see and whether satisfy testing requirements, if system's vibration shape meets the demands, then this time measure effectively, preserve test figure, carry out next step calculating, if the vibration shape does not meet the demands, after then turning back to step 1 and changing measurement parameter again, check that each rig for testing is whether normal, test again;
Step 7: the bridge plate frequency response function X (ω) and rail plate frequency response function Y (ω) data that measure according to step 6, in Matlab7.0, calculate equivalent single-mode system frequency response function H (ω), so just can obtain the rigidity k and the damping c of the rail plate faying face of surveying according to formula (6) and formula (7).
7. the measuring method of rail plate faying face dynamic characteristic parameter proving installation according to claim 6, it is characterized in that, the quantity of the piezoelectric acceleration transducer of upward placing at slide block [6] in the step 2 [7] is 15, and going up the quantity of placing piezoelectric acceleration transducer [7] at rolling guide [3] is 8.
8. the measuring method of rail plate faying face dynamic characteristic parameter proving installation according to claim 6 is characterized in that, the required formula of step 7 calculated rigidity k is
Calculating the used formula of damping c is c=2m ω
nζ, m is the quality of slide block [6] in the described formula, ω
nBe system frequency, ξ is a damping ratio.
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