CN105334040A - Research test bed for fatigue strength and load spectra of proportional vehicle body under multi-point excitation load - Google Patents

Research test bed for fatigue strength and load spectra of proportional vehicle body under multi-point excitation load Download PDF

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Publication number
CN105334040A
CN105334040A CN201510848738.8A CN201510848738A CN105334040A CN 105334040 A CN105334040 A CN 105334040A CN 201510848738 A CN201510848738 A CN 201510848738A CN 105334040 A CN105334040 A CN 105334040A
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car body
actuator
ratio car
longitudinal
ratio
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CN105334040B (en
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缪炳荣
张卫华
谭仕发
史艳民
李旭娟
杨忠坤
王名月
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Southwest Jiaotong University
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Southwest Jiaotong University
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Abstract

The invention discloses a research test bed for the fatigue strength and load spectra of a proportional vehicle body under multi-point excitation load. The research test bed comprises a mechanical part and an electrical part, wherein the mechanical part comprises T-shaped groove experiment table, a supporting device, the proportional vehicle body and the like, and the electrical part comprises a system main controller, a servo controller and the like. The proportional vehicle body is connected to the T-shaped groove experiment table through the supporting device, two secondary-spring vertical actuators are arranged in a cavity of the supporting device, the two ends of the proportional vehicle body are provided with a longitudinal actuator and a longitudinal shock absorber respectively, the two sides of the proportional vehicle body are provided with a transverse actuator and a transverse shock absorber respectively, the T-shaped groove experiment table is provided with four lower-portion vertical actuators acting on a base plate of the proportional vehicle body, the lower-portion vertical actuators are located in the middle of the bottom of the proportional vehicle body, and the top of the proportional vehicle body is provided with a top vertical actuator. The research test bed is mainly used for evaluating the fatigue strength of a rail traffic vehicle aluminum alloy body, and then the fatigue failure problem of the vehicle body can be researched.

Description

Ratio car body fatigue strength and loading spectrum development test platform under excitation load
Technical field
The present invention relates to transit equipment field, particularly relate to ratio car body fatigue strength and loading spectrum development test platform under a kind of excitation load.
Background technology
At present, the light metals such as aluminium alloy are widely used in the manufacture of rail vehicle, and mainly because of aluminum alloy bodywork, not only quality is light for this, is easy to reclaim, and can meets the light-weighted active demand of car body.But light-weighted aluminium alloy structure design also also exists some serious shortcomings, and such as fatigue resistance is poor, easily causes structural fatigue to lose efficacy under the excitation of extraneous random load.At present, mostly by static load test, strength assessment is carried out to the strength assessment of car body both at home and abroad, simultaneously, the experimental cost of existing 1:1 car body fatigue strength is too high, and according to document, can find that vehicle body strength test stand is except vertical, horizontal and vertical load considered by needs, rarely has the consideration to car body top load and equipment Vibrating Load.
China's " rail truck Intensity Design and test for identification specification " TB/T1335-1996 standard regulation vehicle intensity experiment standard, specification is mentioned, test load should be not less than basic role load value but standard of perfection still must convert by basic role load, the principle that reduced stress value combines according to maximum possible is synthesized when identifying intensity.
China's " railroad coach car body static strength experimental technique " TB1806-2006 standard specifies: the normal formula of passenger car body strength assessment---fourth strength theory; Vertical load (comprising static load and dynamic loading), longitudinal loading, torsional load, side force act on down simultaneously, and the resulting stress of each measuring point should be not more than the need stress of material.Under the underframe pushing up vehicle-mounted lotus and car body bearing structure applying be equivalent to the vertical load effect of weight of equipment and weight in working order, the stress of each measuring point should be not more than the yield limit of material, and parking stall, top and neighbouring structure thereof do not produce permanent strain; Under accident load, the stress of each measuring point should be not more than the yield limit of material.
China's " more than 200km/h velocity stage rail truck Intensity Design and test for identification temporary provisions " defines in vehicle Intensity Design, and the necessary vehicle basic role load considered has vertical static load to comprise deadweight, load-carrying and weight in working order.Wherein body construction deadweight and passenger's (comprising cabin luggage) weight by Uniform Loads on vehicle body bottom frame; Vertical Vibration Load lotus is multiplied by vertical Dynamic Amplification Factor by vertical static load and determines.Vertical Vibration Load lotus is taken as 0.3 times of vertical static load, and namely vertical Dynamic Amplification Factor is taken as 0.3; What longitudinal loading to comprise on height of coupler center from top of rail that longitudinally acting force and the motor-car place of being pulled in longitudinally act on is held in tractive force.
China's " locomotive car body test of static strength specification " TB/T2541-2010 standard defines the static load test method evaluating rail truck body construction intensity.Multiple standard of loading test method is given: vertical load test, longitudinal compression load test, longitudinal stretching load test stabilization, torsional load test etc. in this standard.In these test methods, vertical load test is directly related with fatigue strength, in standard TB/T2541-2010, vertical load experiment is mentioned, the load of vertical load test is vertical test load, the distribution of vertical test load should be arranged with distributed load or centre-point load by the deployment scenarios of equipment on locomotive, and wherein car body deadweight should be arranged by uniformly distributed load.Vertical test load usable oils pressure device loads, and also can load with counterweight or weight.
" rail truck Intensity Design and test for identification specification " TB/T1335-1996 standard, " more than 200km/h velocity stage rail truck Intensity Design and test for identification temporary provisions " and " locomotive car body test of static strength specification " TB/T2541-2010 standard, all give static load test standard, do not provide fatigue strength experimental standard, in TB/T1335-1996 standard, during regulation qualification intensity, EXPERIMENTAL STRAIN-STRESS CONVERSION must be carried out, stress under vertical static load will consider the impact of dynamic loading, and concrete reduction formula is as follows:
σ d=σ c(1+K d)
Wherein σ dfor dynamic stress, σ cfor static stress, K dfor Dynamic factor.
Japan JISE7105 standard defines the static load test method evaluating rail truck body construction intensity.In vertical static load test, except corresponding to the basic load of passenger and equipment quality, car body floor also to apply equivalent dynamic loading (two parts load iron block uniform load is at hull bottom plate), then measure its static stress and distortion.From the stress recorded, isolate static stress part and dynamic stress part, draw Goodman curve map according to parts fatigue test results.The possibility of each structural weak point generation fatigure failure is evaluated again with Goodman curve map.
" Railwayapplications-Structuralrequirementsofrailwayvehic lebodies " European standard EN12663:2000 defines in rolling stock design needs the load working condition considered to comprise vertical static load, Vertical Vibration Load, pneumatic traction, integral lifting, longitudinal stretching, longitudinal compression, rescue etc.Usually cause car body fatigue load to comprise loading, unloading circulation, track irregularity encourages, aerodynamic loading and traction braking load etc.
In above-mentioned several specification, be all by static load test outcome evaluation car body strength, although it is simple and practical to evaluate fatigue strength with static load test method, static load test may can't find some potential crackles.
Summary of the invention
The present invention aims to provide ratio car body fatigue strength and loading spectrum development test platform under a kind of excitation load, disclose a kind of large-scale test unit and carry out dynamic load that is virtually reality like reality, the fatigue strength of urban transportation aluminum alloy bodywork can be assessed, thus the problem of fatigue damage of research car body; Utilize the actuator in three directions to provide exciting force, the dynamic load effect of all directions can be simulated well; By the exciting force effect of high cycle index, the ratio car body of causing cracks, and this can find out fatigue crack position, and research crackle produces, crack propagation law, and by data acquisition instrument record stress, acceleration, displacement time-histories.
For achieving the above object, the present invention realizes by the following technical solutions:
The present invention discloses ratio car body fatigue strength and loading spectrum development test platform under a kind of excitation load, comprises mechanical part and electric part, it is characterized in that: described mechanical part comprises T-slot experiment table, bracing or strutting arrangement, ratio car body; Described ratio car body is connected on T-slot experiment table by bracing or strutting arrangement, described bracing or strutting arrangement comprises support column and rubber air spring, described support column comprises cavity, support column lower end is connected with T-slot experiment table, support column top connects rubber air spring, rubber air spring top connects the base plate of ratio car body, and two is that the vertical actuator of spring is placed in the cavity of support column, and support column upper surface is provided with the exciting hole with cavity connects; The two ends of ratio car body arrange respectively and are provided with longitudinal actuator, longitudinal vibroshock, the both sides of ratio car body are respectively equipped with horizontal actuator and transverse damper, described T-slot experiment table is arranged four vertical actuator in bottom acting on ratio hull bottom plate, the vertical actuator in described bottom is positioned at ratio vehicle bottom centre position, and ratio car body top is provided with the vertical actuator in top; Described electric part comprises the sensor be arranged on ratio car body, described electric part comprises sensor, described sensor connection data acquisition instrument, described data acquisition instrument connects computing machine, and sensor comprises acceleration transducer, displacement transducer and load transducer.
Vertical actuator applies exciting force by the exciting hole of support column upper end to rubber air spring, and exciting force is passed to car body by air spring, suffered by Reality simulation car body being the oscillating load of spring from two.
Longitudinal actuator and longitudinal vibroshock are for simulating train traction, braking procedure to the impact of car body fatigue strength, and horizontal actuator and transverse damper are for simulating the transverse vibration suffered by car body.
The vertical actuator in bottom is for simulating in train travelling process, and ventilation blower, main-transformer, traction convertor, useless arranging device wait for bus lower hanging equipment to the impact of car body fatigue strength.
The vertical actuator in top is for simulating air-conditioning, pantograph to the impact of car body fatigue strength.
The signal of sensor collection may be used for the experimental studies such as load identification, Identification of Cracks.
Preferably, described mechanical part also comprises end column, side uprights and top longitudinal beam, described end column has two, lay respectively at the two ends of ratio car body, described side uprights has 4, be positioned at the two sides of ratio car body, two, each side, described top longitudinal beam is positioned at directly over ratio car body, the axis direction of top longitudinal beam is identical with the axis direction of ratio car body, the side of top longitudinal beam is connected with side direction column by web joint, described web joint and top longitudinal beam, the equal screw of side direction column connects, to ensure the stability of experimental stand, web joint adopts thin plate, change after facilitating side direction resetting of post.
Preferably, described support column is bolted on T-slot experiment table, described T-slot experiment table be provided with support column bottom suitable horizontal T-slot and longitudinal T-slot A exciting support column have 4, laying respectively at bullet train two is spring correspondence position; 4 support columns correspond to the empty spring position of actual steering frame system, and rubber air spring spring plays a part same with actual steering frame system secondary suspension.
Four the vertical actuator in bottom longitudinally arrangements, are connected with T-slot testing table by bolt bottom the vertical actuator in bottom, longitudinal T-slot B that the bottom that described T-slot testing table table top is provided with the vertical actuator with bottom is suitable; The installation site of the vertical actuator in bottom can longitudinally adjustment in T-slot B.
Preferably, described longitudinal actuator is arranged on one end of ratio car body, and described longitudinal vibroshock is arranged on the other end of ratio car body, and longitudinal actuator and longitudinal shock absorber are just right, in order to avoid cause unbalanced moments; Longitudinal actuator is connected with the end column being positioned at ratio car body two ends respectively by bolt with longitudinal shock absorber.
Preferably, described horizontal actuator is arranged on the side of ratio car body, described transverse damper is arranged on the opposite side of ratio car body, horizontal actuator and transverse damper just right, horizontal actuator, transverse damper connect the column being positioned at ratio car body both sides respectively by bolt, described column lower end is bolted on T-shaped laboratory bench top, described T-shaped laboratory bench top is provided with the longitudinal T-slot C suitable with column lower end, column is provided with the threaded hole of vertical arrangement, can realize the fine setting up and down of start and damping position.
Preferably, the vertical actuator in described top is bolted top longitudinal beam, and the vertical actuator in described top has two, is placed in the corresponding position of the installation site of actual car body air-conditioning and pantograph respectively, in simulation train travelling process, air-conditioning, pantograph are on the impact of car body fatigue strength.
Preferably, described longitudinal vibroshock, transverse damper are oleo damper, described oleo damper overcoat steel spring, and the two ends of described steel spring are provided with packing ring, are provided with nut outside packing ring; By the change of nut location, can initial tension of spring be changed, thus change the rigidity of vibroshock.The vertical actuator in described bottom, the vertical actuator in top, horizontal actuator, longitudinal actuator are hydraulic actuator and adopt servo controller and Pump Control, described system master controller connects servo controller, measured signal is sampled, voltage/current signals is converted into according to control algolithm, finally with current and voltage signals, instruction is sent to servo controller, control the rotating speed of motor and turn to, drive hydraulic oil pump, drive ram makes displacement or the effect of pressure exciting to car body.In addition, for ensureing that actuator applies the consistance of activation signal and Setting signal, actuator is furnished with displacement and pressure transducer, activation signal passes system controller back, with the contrast of Setting signal, the close-loop feedback realizing control system regulates, and ensure that the controllability and accuracy of making dynamic loading.
Preferably, the material of described ratio car body is 6061-T6 type aluminum alloy materials, and ratio car body is that the 1:8 of CRH380B car body physical size reduces Welded tower structure.
Preferably, described load transducer is foil gauge, and wherein a part of foil gauge is distributed near the door of ratio car body, the position of window corner; Two be the vertical actuator of spring, the vertical actuator in bottom, the vertical actuator in top, horizontal actuator, longitudinal actuator are all being furnished with displacement transducer and pressure transducer.
Principle of work of the present invention: carry out analytic statistics by, extensional vibration signal horizontal, vertical to bullet train actual measurement, form loading spectrum; Loading spectrum data are formed acting force and effect frequency bearing signal by control system, realize signal waveform by control algolithm to change to electric current, voltage signal, finally with current and voltage signals, instruction is sent to servo controller, control the rotating speed of motor and turn to, drive hydraulic oil pump, drive ram makes displacement or the effect of pressure exciting to car body.By data acquisition instrument, gather the data passed back by sensor and foil gauge, Computer Storage data, and carry out abnormal value elimination to experimental data, disappear the process such as trend term, filtering.Finally, statistical study is carried out to data, thus realize the equivalence research of high-speed train body fatigue strength, loading spectrum research, Identification of Cracks and load Study of recognition.In addition, for ensureing that actuator applies the consistance of activation signal and Setting signal, actuator is furnished with displacement and pressure transducer, activation signal passes system controller back, with the contrast of Setting signal, the close-loop feedback realizing control system regulates, and ensure that the controllability and accuracy of making dynamic loading.
Regulate the lengthwise position of support column, be arranged on testing table by ratio car body, moveable support column position achieves the variation of Support Position, vertical energized position; Regulate longitudinal actuator in the fixed position of end column, the change of longitudinal impacting point position can be realized; Regulate the lengthwise position of side direction column and the point of fixity of horizontal actuator, the change of horizontal impacting point can be realized.
By changing the point of fixity of actuator, can realize different exciting modes, meanwhile, the dynamic perfromance choosing ratio car body direction (as vertical) is research object, and the actuator of another both direction can be allowed to stop.In test, ratio car body is provided with various power unit's sensor (containing displacement, acceleration etc.), ess-strain sheet and the signal wire for transmission of signal.Ratio car body fatigue strength and loading spectrum development test platform under excitation load, the equivalence research of the fatigue resistance of the ratio body construction of different rail vehicle, dynamic stiffness can be realized, and by the pumping signal of acquisition and the time history of response, use modern signal processing, obtain structural frequency response function, obtain the physical parameter of structural system, load identification and sensitivity analysis are carried out to structural physical parameter, realize identification and the optimization of structural parameters.
Ratio car body adopts 6061-T6 type aluminium alloy plate to be welded, weight 44.6kg, car body is of a size of 3022 × 407 × 358mm, and wherein aluminium plate thickness is 4mm, test-bed structure and scale is little, greatly can reduce the cost of fatigue resistance experiment and load identification experimental study.
Compared with prior art, beneficial effect of the present invention is mainly:
One, load data can be surveyed according to bullet train, load data is reduced, via system master controller, according to control algolithm, actual measurement load signal is converted to voltage and current signal, sends instruction via servo controller, control the rotating speed of motor and turn to, drive hydraulic oil pump, drive ram makes displacement or the effect of pressure exciting to car body, can realize studying the equivalence of high-speed train body fatigue strength, load identification, Identification of Cracks etc.
Two, the experimentation cost that circuit experiment is expensive can significantly be reduced, the present invention is mainly used in dynamic loading experiment, the generation of research ratio car body fatigue crack and propagation law, the ratio body construction intensity of different rail vehicle and the equivalence research of fatigue properties can be realized, realize the parameter Optimization Analysis of body construction sectional dimension.
Three, ratio car body fatigue resistance testing table can carry out structural vibration, strength and stiffness equivalence, fatigue properties, structure Dynamic Load Identification technology, parametric sensitivity etc. to 1:8 equal proportion size car body and studies in great detail.
Four, 6061-T6 type aluminum alloy materials, weight 44.6kg, car body is of a size of 3022 × 407 × 358mm, and wherein aluminium plate thickness is 4mm, and test-bed structure and scale is little, greatly can reduce the cost of fatigue resistance experiment and load identification experimental study.
Five, data acquisition instrument obtain acceleration, displacement and stress signal, can be used for car body fatigue strength, Identification of Cracks and load Study of recognition.
To sum up, ratio car body fatigue strength and loading spectrum development test platform under excitation load disclosed in this invention, be intended to based on ratio car body fatigue strength under set up excitation load and loading spectrum development test platform, carry out analytic statistics by, extensional vibration signal horizontal, vertical to bullet train actual measurement, form loading spectrum; Loading spectrum data are formed acting force and effect frequency bearing signal by control system, realize signal waveform by control algolithm to change to electric current, voltage signal, finally with current and voltage signals, instruction is sent to servo controller, control the rotating speed of motor and turn to, drive hydraulic oil pump, drive ram makes displacement or the effect of pressure exciting to car body.By data acquisition instrument, gather the data passed back by sensor and foil gauge, Computer Storage data, and carry out abnormal value elimination to experimental data, disappear the process such as trend term, filtering.Finally, statistical study is carried out to data, thus realize the equivalence research of high-speed train body fatigue strength, Identification of Cracks and load Study of recognition.In addition, for ensureing that actuator applies the consistance of activation signal and Setting signal, actuator is furnished with displacement and pressure transducer, activation signal passes system controller back, with the contrast of Setting signal, the close-loop feedback realizing control system regulates, and ensure that the controllability and accuracy of making dynamic loading.Car body exemplary position point sensor installation and foil gauge, to test displacement, acceleration and strain signal, test signal, via the magnificent collecting device data in east, is finally transferred to computing machine, carries out analyzing and processing, obtain ratio car body dynamic perfromance and vibration performance.In addition, the exciting force of high cycle index causes ratio car body to crack, and record crack position and exciting force cycle index, carry out fatigue analysis in conjunction with institute's image data.The acceleration gathered, displacement and stress signal, for car body fatigue strength, Identification of Cracks and load identification.
Accompanying drawing explanation
Fig. 1 is general illustration of the present invention;
Fig. 2 is the front view of mechanical part;
Fig. 3 is the left view of mechanical part;
Fig. 4 is the vertical view of mechanical part;
Fig. 5 is the transverse sectional view of mechanical part;
Fig. 6 is vibroshock signal;
Fig. 7 is the partial sectional view of vibroshock;
The assembling schematic diagram of Fig. 8 to be support column, two the be vertical actuator of spring and rubber air spring;
Fig. 9 is that the exemplary position of foil gauge arranges schematic diagram;
In figure: the column of 1-end, 2-ratio car body, 3-sensor, 4-foil gauge, the longitudinal actuator of 5-, 6-support column, 7-side uprights, 8, 9, 10, the vertical actuator in 11-bottom, 12-rubber air spring, the longitudinal vibroshock of 13-, 14-T type groove testing table, 15-top cross-bar, 16-transverse damper, 17-bis-is the vertical actuator of spring, the horizontal actuator of 18-, 19-web joint, the vertical actuator in 20-top, 21-nut, 22-packing ring, 23-steel spring, 24-caulking gum, 25-piston rod, 26-piston ring, 27-piston head, 28-window angular strain flower.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with accompanying drawing, the present invention is further elaborated.
As shown in Figure 1, the present invention carries out analytic statistics by, extensional vibration signal horizontal, vertical to bullet train actual measurement, forms loading spectrum; Loading spectrum data are formed acting force and effect frequency bearing signal by control system, realize signal waveform by control algolithm to change to electric current, voltage signal, finally with current and voltage signals, instruction is sent to servo controller, control the rotating speed of motor and turn to, drive hydraulic oil pump, drive ram makes displacement or the effect of pressure exciting to car body.By data acquisition instrument, gather the data passed back by sensor and foil gauge, Computer Storage data, and carry out abnormal value elimination to experimental data, disappear the process such as trend term, filtering.Finally, statistical study is carried out to data, thus realize the equivalence research of high-speed train body fatigue strength, Identification of Cracks and load Study of recognition.In addition, for ensureing that actuator applies the consistance of activation signal and Setting signal, actuator is furnished with displacement and pressure transducer, activation signal passes system controller back, with the contrast of Setting signal, the close-loop feedback realizing control system regulates, and ensure that the controllability and accuracy of making dynamic loading.
Shown in Fig. 2-Fig. 5, mechanical part of the present invention comprises longitudinal column 1, ratio car body 2, transverse upright 7, bracing or strutting arrangement, T-slot testing table 14 etc.Wherein, the material of ratio car body 2 is 6061-T6 type aluminum alloy materials, and ratio car body 2 is 1:8 with the ratio of actual car body.The vertical actuator in side uprights 7, bracing or strutting arrangement and bottom 8,9,10,11 bolt is arranged on T-shaped testing table 14, can realize transverse and longitudinal and move; Horizontal actuator 18, to be connected by bolt between transverse damper 16 with side uprights 7, longitudinal actuator, be connected by bolt between longitudinal vibroshock 13 with end column 1, horizontal actuator 18 transverse damper 16, longitudinal actuator, longitudinal vibroshock 13 all can up-down adjustment installation sites; The vertical actuator 20 in top is connected to bottom top longitudinal beam 15 by bolt, and its installation site can longitudinally adjust to adapt to different proportion size car body.Ratio car body 2 is connected to support column 6 top by rubber air spring 12, horizontal actuator 18 and transverse damper 16 installation site just right, the two active position is the web joint with hull bottom plate, and the vertical actuator 20 in top is connected with top longitudinal beam 15, and acts on car body roof plate.
The structure of transverse damper 16, longitudinal vibroshock 13 is identical, below be referred to as vibroshock, as shown in Figure 6, Figure 7, vibroshock comprises piston rod 25 and piston ring 26, and piston rod 25 front end connects piston head 27, piston ring 26, piston head 27 overcoat steel spring 23, the two ends of firm spring 23 are furnished with packing ring 22, are a nut 21, by the change of nut 21 position outside packing ring 22, the pretightning force of steel spring 23 can be changed, thus change the rigidity of vibroshock.
As shown in Figure 8, bracing or strutting arrangement comprises support column 6, being furnished with two in the cavity of support column 6 is the vertical actuator 17 of spring, the end face of support column 6 is bolted rubber air spring 12, rubber air spring 12 is finally connected to ratio car body 2 base plate, transmitting vibrations on the one hand, absorbs vibration on the other hand.
Power-control section comprises system master controller, servo controller, servomotor, hydraulic oil pump, hydraulic oil pump etc., sensor 3, foil gauge 4 are arranged on ratio car body, as Fig. 2, sensor 3, foil gauge 4 connect strain amplifier, strain amplifier connection data acquisition instrument, data acquisition instrument connects computing machine, and sensor and foil gauge image data can store in a computer.Totally and generally it, on the one hand, loading spectrum input signal passes through control system, realize signal waveform by control algolithm to change to electric current, voltage signal, finally with current and voltage signals, instruction is sent to servo controller, control the rotating speed of motor and turn to, drive hydraulic oil pump, drive ram comparative example car body 2 makes displacement or the effect of pressure exciting.On the other hand, for ensureing that actuator applies the consistance of activation signal and Setting signal, actuator is furnished with displacement and pressure transducer, activation signal passes system controller back, with the contrast of Setting signal, the close-loop feedback realizing control system regulates, and ensure that the controllability and accuracy of making dynamic loading.
As shown in Figure 9, the exemplary configurations position of foil gauge 4 is door, the window corner of close ratio car body 2, is gathered the strained situation of window angle, door angle equal stress concentrated position in actuator exciting process by foil gauge; Multiple foil gauge 4 can be arranged to window angular strain and spend 28.
Actual use-pattern of the present invention is as follows:
1, aluminium alloy ratio car body is placed on rubber air spring, fixing actuator position, and pastes foil gauge on vehicle body, sensor installation simultaneously, arrange the connection of control system link and acquisition system.
2, first carry out static load test, basic load utilizes bloom to be evenly applied on floor.Basic load corresponds to passenger and equipment quality.Stress and displacement under full load condition is calculated by data acquisition system (DAS).
3, instantaneous exciting is applied to car body, then carry out spectrum analysis, measure the natural frequency of car body.
4, before beginning dynamic fatigue load test, trial test is carried out to determine the size of actuator exciting force.Car body dynamic accelerated motion is on the line reproduced by the forced vibration of actuator.Car body bears the fixed load caused by quality and the alternate load caused by actuator forced vibration.
5, signal is made to pass through control system, realize signal waveform by control algolithm to change to electric current, voltage signal, finally with current and voltage signals, instruction is sent to servo controller, control the rotating speed of motor and turn to, drive hydraulic oil pump, drive ram makes displacement or the effect of pressure exciting to car body.
6, the static stress and distortion displacement data signal of all measuring points is obtained by the magnificent collecting device in east, and transfers to computing machine.When having detected that crackle occurs, record exciting force cycle index, has stopped test checking.For very serious destruction, need carry out measuring and repair welding.Proceed dynamic fatigue load test to 2 × 10 6 circulations, and check potential crack comprehensively, there is position and exciting force cycle index in record fatigue crack.
According to position and the cycle index of fatigue crack initiation, analysis, and foil gauge image data is analyzed, there are stress amplitude, average and cycle index data suffered by position in statistics crackle; Displacement, acceleration transducer collection signal are used for load identification, Identification of Cracks, obtains structural frequency response function, obtains the physical parameter of structural system, load identification and sensitivity analysis are carried out to structural physical parameter, realizes the aspect research such as identification and optimization of structural parameters.
Certainly; the present invention also can have other various embodiments; when not deviating from the present invention's spirit and essence thereof; those of ordinary skill in the art can make various corresponding change and distortion according to the present invention, but these change accordingly and are out of shape the protection domain that all should belong to the claim appended by the present invention.

Claims (10)

1. ratio car body fatigue strength and loading spectrum development test platform under excitation load, comprise mechanical part and electric part, it is characterized in that: described mechanical part comprises T-slot experiment table, bracing or strutting arrangement, ratio car body; Described electric part comprises system master controller, servo controller.Described ratio car body is connected on T-slot experiment table by bracing or strutting arrangement, described bracing or strutting arrangement comprises support column and rubber air spring, described support column comprises cavity, support column lower end is connected with T-slot experiment table, support column top connects rubber air spring, rubber air spring top connects the base plate of ratio car body, and two is that the vertical actuator of spring is placed in the cavity of support column, and support column upper surface is provided with the exciting hole with cavity connects; The two ends of ratio car body arrange respectively and are provided with longitudinal actuator, longitudinal vibroshock, the both sides of ratio car body are respectively equipped with horizontal actuator and transverse damper, described T-slot experiment table is arranged four vertical actuator in bottom acting on ratio hull bottom plate, the vertical actuator in described bottom is positioned at ratio vehicle bottom centre position, and ratio car body top is provided with the vertical actuator in top; Described electric part comprises the sensor be arranged on ratio car body, described sensor connection data acquisition instrument, and described data acquisition instrument connects computing machine, and sensor comprises acceleration transducer, displacement transducer and load transducer.
2. ratio car body fatigue strength and loading spectrum development test platform under excitation load according to claim 1, it is characterized in that: described mechanical part also comprises end column, side uprights and top longitudinal beam, described end column has two, lay respectively at the two ends of ratio car body, described side uprights has 4, be positioned at the two sides of ratio car body, two, each side, described top longitudinal beam is positioned at directly over ratio car body, the axis direction of top longitudinal beam is identical with the axis direction of ratio car body, the side of top longitudinal beam is connected with side direction column by web joint, described web joint and top longitudinal beam, the equal screw of side direction column connects.
3. ratio car body fatigue strength and loading spectrum development test platform under excitation load according to claim 1, it is characterized in that: described support column is bolted on T-slot experiment table, described T-slot experiment table be provided with support column bottom suitable horizontal T-slot and longitudinal T-slot A, exciting support column has 4, and laying respectively at bullet train two is spring correspondence position.
4. ratio car body fatigue strength and loading spectrum development test platform under excitation load according to claim 1, it is characterized in that: four the vertical actuator in bottom longitudinally arrangements, be connected with T-slot testing table by bolt bottom the vertical actuator in bottom, longitudinal T-slot B that the bottom that described T-slot testing table table top is provided with the vertical actuator with bottom is suitable.
5. ratio car body fatigue strength and loading spectrum development test platform under excitation load according to claim 2, it is characterized in that: described longitudinal actuator is arranged on one end of ratio car body, described longitudinal vibroshock is arranged on the other end of ratio car body, longitudinal actuator and longitudinal shock absorber just right, longitudinal actuator is connected with the end column being positioned at ratio car body two ends respectively by bolt with longitudinal shock absorber.
6. ratio car body fatigue strength and loading spectrum development test platform under excitation load according to claim 2, it is characterized in that: described horizontal actuator is arranged on the side of ratio car body, described transverse damper is arranged on the opposite side of ratio car body, horizontal actuator and transverse damper just right, horizontal actuator, transverse damper connects the column being positioned at ratio car body both sides respectively by bolt, described column lower end is bolted on T-shaped laboratory bench top, described T-shaped laboratory bench top is provided with the longitudinal T-slot C suitable with column lower end, column is provided with the threaded hole of vertical arrangement.
7. ratio car body fatigue strength and loading spectrum development test platform under excitation load according to claim 2, it is characterized in that: the vertical actuator in described top is bolted top longitudinal beam, the vertical actuator in described top has two, is placed in the corresponding position of the installation site of actual car body air-conditioning and pantograph respectively.
8. ratio car body fatigue strength and loading spectrum development test platform under excitation load according to claim 1, it is characterized in that: described longitudinal vibroshock, transverse damper are oleo damper, described oleo damper overcoat steel spring, the two ends of described steel spring are provided with packing ring, are provided with nut outside packing ring; The vertical actuator in described bottom, the vertical actuator in top, horizontal actuator, longitudinal actuator are hydraulic actuator and adopt servo controller and Pump Control.
9. ratio car body fatigue strength and loading spectrum development test platform under excitation load according to claim 1, it is characterized in that: the material of described ratio car body is 6061-T6 type aluminum alloy materials, ratio car body is that the 1:8 of CRH380B car body physical size reduces Welded tower structure.
10. ratio car body fatigue strength and loading spectrum development test platform under excitation load according to claim 1, it is characterized in that: described load transducer is foil gauge, wherein a part of foil gauge is distributed near the door of ratio car body, the position of window corner; Two be the vertical actuator of spring, the vertical actuator in bottom, the vertical actuator in top, horizontal actuator, longitudinal actuator are all being furnished with displacement transducer and pressure transducer.
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