CN102607973B - Roadbed dynamic response in-situ test system and roadbed dynamic response in-situ test method - Google Patents
Roadbed dynamic response in-situ test system and roadbed dynamic response in-situ test method Download PDFInfo
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- CN102607973B CN102607973B CN201210057921.2A CN201210057921A CN102607973B CN 102607973 B CN102607973 B CN 102607973B CN 201210057921 A CN201210057921 A CN 201210057921A CN 102607973 B CN102607973 B CN 102607973B
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Abstract
The invention relates to a roadbed dynamic response in-situ test system and a roadbed dynamic response in-situ test method. The scheme includes that an oil pump (12) is respectively communicated with a P-port of an electro-hydraulic servo valve (6) and a P-port of a first electromagnetic directional valve (8) through a one-way valve (10), an A-port and a B-port of the electro-hydraulic servo valve (6) are correspondingly communicated with a third and fourth operational oil ports (38 and 41) of a two-stage servo hydraulic cylinder (26), and an A-port of the first electromagnetic directional valve (8) is respectively communicated with a second operational oil port (36) of the two-stage servo hydraulic cylinder (26), an A-port of an electromagnetic ball valve (18) and an energy accumulator (5) through a second one-way valve (7). An operational end of the two-stage servo hydraulic cylinder (26) is tightly pressed on the surface of a roadbed (2) through a load sensor (24) and an excitation disc (23), all sensors in the system are electrically connected with a data acquisition card (2), and the data acquisition card (2) and computer auxiliary testing software (1) are mounted in a computer. Using the roadbed dynamic response in-situ test system and the roadbed dynamic response in-situ test method can not only realize in-situ prototype tests but also actively control test conditions.
Description
Technical field
The invention belongs to roadbed experimental technique field.Be specifically related to a kind of roadbed dynamic response in-situ test system and test method.
Background technology
High-speed railway requires very high to the regularity and stability of track, will certainly affect the regularity and stability of track as the sedimentation of the basic roadbed of bearing track construction weight and train load and distortion.Therefore,, in order to ensure the steady and safe operation of bullet train, Train induced load effect lower railway roadbed dynamical problem is the essential basic problem of considering of high speed railway construction.
Roadbed not only will bear the dead weight of superstructure, the repeated action of dynamic loading while being also subject to train operation.Bullet train not only can increase dynamic load and the vibration frequency of train, and can improve the vibration acceleration of roadbed, accelerate the vibration of train and track, thereby expansion roadbed is subject to the impact of dynamic loading, weaken roadbed kinetic stability, affect the normal operation and maintenance of high-speed railway.Therefore, how to be familiar with working mechanism and mechanical characteristic, the especially dynamics of roadbed under the effect of bullet train long-term repeated loading, to guarantee that bullet train safe passing becomes extremely important and urgent.
Common test method has site test and indoor model test.Site test is the most direct basic means of research roadbed dynamic perfromance, and the Research on Dynamic Characteristic that can be research roadbed provides the firsthand information, and China has carried out on-the-spot roadbed dynamic test at Datong-Qinhuangdao Railway, Chengdu-Kunming Railway Line and Baoji-Chengdu Railway philosophy.But site test has significant limitation, it is a kind of passive method of testing, cannot initiatively control test, and test result has often comprised the impact of many factors, is unfavorable for the announcement of track bed dynamic response fundamental law.Indoor model test, disclosing the inherent law of spontaneous phenomenon, setting up also and brought into play vital role in proof theory pattern, can effect and the roadbed dynamic perfromance to roadbed effectively be studied by simulation train load.But indoor model test also has its limitation, because the Similar Problems of model and prototype structure does not also solve completely, cannot set up model strict, that meet simulated condition completely, again owing to having scale effect and boundary effect, model can not completely quantitatively be scaled prototype, so its test findings and actual conditions have certain difference.
Summary of the invention
The present invention is intended to the deficiency in order to overcome existing indoor model test and site test, and object is to provide one can realize site test, roadbed dynamic response in-situ test system and test method that again can ACTIVE CONTROL test condition.
For achieving the above object, roadbed dynamic response in-situ test system in the technical solution used in the present invention is: oil pump connects with motor coaxle, the inlet port of oil pump communicates with fuel tank by oil pipe, the force feed mouth of oil pump communicates respectively with the oil-in of surplus valve and the oil-in of the first retaining valve by oil pipe, the oil-out of surplus valve communicates with fuel tank by oil pipe, the control mouth of surplus valve communicates with the A mouth of the second solenoid directional control valve, the T mouth of the second solenoid directional control valve communicates with fuel tank by oil pipe, and the P mouth of the second solenoid directional control valve blocks; The oil-out of the first retaining valve communicates with the oil-in of the first filtrator by oil pipe, and the oil-out of the first filtrator communicates respectively with the P mouth of electrohydraulic servo valve and the P mouth of the first solenoid directional control valve by oil pipe.
The A mouth of electrohydraulic servo valve communicates with the 3rd actuator port of the dynamic pressure cavity of two-stage servo hydraulic cylinder by oil pipe, the B mouth of electrohydraulic servo valve communicates with the 4th actuator port of the dynamic pressure cavity of two-stage servo hydraulic cylinder by oil pipe, the T mouth of electrohydraulic servo valve communicates with the oil-in of refrigeratory by oil pipe, and the oil-out of refrigeratory communicates with fuel tank by the second filtrator.
The T mouth of the first solenoid directional control valve blocks, the A mouth of the first solenoid directional control valve communicates with the oil-in of the second retaining valve by oil pipe, the oil-out of the second retaining valve communicates with second actuator port in the static pressure chamber of two-stage servo hydraulic cylinder, A mouth and the accumulator of Solenoid ball valve respectively by oil pipe, first actuator port in the static pressure chamber of two-stage servo hydraulic cylinder communicates with the oil-in of refrigeratory, the T mouth of Solenoid ball valve communicates with the oil-in of refrigeratory, and the P mouth of Solenoid ball valve blocks.
The working end of the dynamic pressure piston rod of two-stage servo hydraulic cylinder connects with one end of load transducer by spring, the working end of static pressure piston rod and one end of load transducer of two-stage servo hydraulic cylinder are fixedly connected, the other end of load transducer and exciting disk are fixedly connected, exciting disk is pressed on road bed, in roadbed, be embedded with soil pressure sensor, acceleration transducer and speed pickup, the right end cap of two-stage servo hydraulic cylinder connects with dipper through hole and the connecting rod through hole of hydraulic excavator by gusset.
The first pressure transducer communicates with the 4th actuator port of the dynamic pressure cavity of two-stage servo hydraulic cylinder by servo valve seat, the second pressure transducer communicates with the 3rd actuator port of the dynamic pressure cavity of two-stage servo hydraulic cylinder by servo valve seat, and the 3rd pressure transducer communicates with second actuator port in the static pressure chamber of two-stage servo hydraulic cylinder by servo valve seat, the first pressure transducer is electrically connected with the A/D-7 mouth of data collecting card, the second pressure transducer is electrically connected with the A/D-6 mouth of data collecting card, the 3rd pressure transducer is electrically connected with the A/D-5 mouth of data collecting card, load transducer is electrically connected with the A/D-4 mouth of data collecting card, soil pressure sensor is electrically connected with the A/D-3 mouth of data collecting card, acceleration transducer is electrically connected with the A/D-2 mouth of data collecting card, speed pickup is electrically connected with the A/D-1 mouth of data collecting card, one end of servoamplifier is electrically connected with the electromagnet of electrohydraulic servo valve, the other end of servoamplifier is electrically connected with one end of PID controller, the other end of PID controller is electrically connected with the D/A-1 mouth of data collecting card, data collecting card and Computerassisted Test Software are arranged in computing machine.
The structure of described two-stage servo hydraulic cylinder is:
Two-stage servo hydraulic cylinder is made up of static pressure cylinder and dynamic pressure cylinder, and the cylinder body of static pressure cylinder and dynamic pressure cylinder is an entirety, and the first half of cylinder body is static pressure cylinder, and latter half is dynamic pressure cylinder, between static pressure cylinder and dynamic pressure cylinder, is provided with cylinder body partition wall.
Static pressure cylinder comprises left end cap, static pressure piston and static pressure piston rod; Static pressure piston rod is hollow cylinder, static pressure piston rod is arranged in the static pressure chamber of static pressure cylinder concentrically, the working end of static pressure piston rod is through left end cap, static pressure piston is arranged on static pressure piston rod, one side of static pressure piston is close to the shaft shoulder of static pressure piston rod, on the static pressure piston rod of static pressure piston opposite side, spring washer and nut is housed; Dynamic pressure cylinder comprises right end cap, dynamic pressure piston and dynamic pressure piston rod, dynamic pressure piston rod is arranged in the dynamic pressure cavity of dynamic pressure cylinder concentrically, dynamic pressure piston is arranged on dynamic pressure piston rod, one side of dynamic pressure piston is close to the shaft shoulder of dynamic pressure piston rod, on the dynamic pressure piston rod of dynamic pressure piston opposite side, spring washer and nut is housed; The 9th O-ring seal, through the through hole at cylinder body partition wall center and the central through hole of static pressure piston rod, is equipped with in the seal groove of dynamic pressure piston rod working end in the working end of dynamic pressure piston rod; The end of dynamic pressure piston rod is through right end cap, and mounting cup is arranged on the center position of right end cap; One end of displacement transducer is fixed on mounting cup, and the other end of displacement transducer is inserted in the hole of dynamic pressure piston-rod end.
On the cylinder body of static pressure cylinder, be respectively equipped with the first actuator port and the second actuator port that communicate with both sides, static pressure chamber, on the cylinder body of dynamic pressure cylinder, be respectively equipped with the 3rd actuator port and the 4th actuator port that communicate with dynamic pressure cavity both sides; Have the 3rd at the inwall of cylinder body partition wall central through hole and leak oily ring groove, the centre position place of cylinder body partition wall is provided with the 3rd and leaks the leakage hydraulic fluid port that oily ring groove communicates; The first actuator port, the second actuator port, the 3rd actuator port, the 4th actuator port and leak hydraulic fluid port respectively the valve port corresponding with servo valve seat communicate.
The through-hole wall of left end cap is provided with the first leakage oil ring groove, and first leaks oily ring groove communicates by the second oily passage of leakage on the cylinder body of the oily passage of leakage of first on left end cap and static pressure cylinder and the oily ring groove of the 3rd leakage; Inwall place at static pressure piston rod corresponding to the first leakage oil ring groove is provided with the second leakage oil ring groove, and second leaks oily ring groove communicates by the 3rd oily passage of leakage and the oily ring groove of the first leakage.
The first width that leaks oily ring groove is 1.3～2 times of static pressure throw of poston.
In described roadbed, be embedded with soil pressure sensor, acceleration transducer and speed pickup and refer to that soil pressure sensor, acceleration transducer and speed pickup are placed on apart from the depths of road bed 50～1000mm.
The main flow of described Computerassisted Test Software is:
S1-1, initializing variable, timing point n=0, arranges vibrational waveform x, excited frequency f and tale points N;
The control voltage u of S1-2, D/A-1 passage output vibrational waveform x and excited frequency f;
S1-3, the cumulative n=n+1 of timing point;
S1-4, scan A/D-1, record roadbed vibration velocity Vn; Scan A/D-2, records roadbed vibration acceleration An; Scan A/D-3, records soil pressure Pn;
S1-5, judge whether n is greater than N, carry out next step if be greater than, return to S1-2 if be less than;
S1-6, taking timing point n as horizontal ordinate, taking roadbed vibration velocity Vn, roadbed vibration acceleration An and soil pressure Pn as ordinate, draw roadbed dynamic response parametric line respectively.
The test method of the roadbed dynamic response in-situ test system in the technical solution used in the present invention is:
S2-1, installation, the described roadbed dynamic response of debugging in-situ test system;
S2-2, startup computing machine, open Computerassisted Test Software;
S2-3, starter motor, oil pump low load operation, progressively sets up the pressure of surplus valve according to the static(al) of exciting force, and hydraulic system is started working;
S2-4, the electromagnet energising of giving the first solenoid directional control valve;
S2-5, reach after the hydrostatic power pressure value of exciting force when accumulator, give the electromagnet power-off of the first solenoid directional control valve;
S2-6, progressively set up the pressure of surplus valve according to the power of exciting force;
S2-7, vibrational waveform x, excited frequency f, tale points N are set in Computerassisted Test Software;
S2-8, start test, wait for the result of roadbed bridge response to forced vibration;
S2-9, roadbed dynamic response parametric line deposit is printed;
S2-10, to Solenoid ball valve energising, accumulator off-load;
S2-11, disable motor, hydraulic system quits work;
S2-12, exit Computerassisted Test Software, shut down computer.
Owing to adopting technique scheme, the present invention has following good effect:
1, the present invention combines the advantage of site test and model test, both can simulate load when train passes through rail, roadbed being produced, and can realize again the ACTIVE CONTROL of test condition, for high-speed railway subgrade DYNAMIC STABILITY provides effective tool.
2, the present invention both can, for Ballast track roadbed dynamic response in-situ test, also can, for ballastless track roadbed dynamic response in-situ test, can also be used for track bed dynamic response simulation test.
3, in the present invention, testing exciting waveform can be both the conventional waveforms such as sine, triangle, step and impulse function, can be also the waveform of specified function, and frequency and amplitude programmed control adjustment online.
4, the present invention can realize the integrated automatic collection of track bed dynamic response.
Therefore, the invention solves the Similar Problems of model and prototype structure, have and can realize on-the-spot prototype test, feature that again can ACTIVE CONTROL test condition.
Brief description of the drawings
Fig. 1 is a kind of roadbed dynamic response in-situ test system schematic of the present invention;
Fig. 2 is a kind of structural representation of two-stage servo hydraulic cylinder 26 in Fig. 1;
Fig. 3 is Fig. 1 Computer subtest software 1 main flow block diagram.
Embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described, not the restriction to its protection domain:
Embodiment 1
A kind of roadbed dynamic response in-situ test system and test method.Described pilot system is as shown in Figure 1: oil pump 12 coaxially connects with motor 11, the inlet port of oil pump 12 communicates with fuel tank 15 by oil pipe, the force feed mouth of oil pump 12 communicates respectively with the oil-in of surplus valve 13 and the oil-in of the first retaining valve 10 by oil pipe, the oil-out of surplus valve 13 communicates with fuel tank 15 by oil pipe, the control mouth of surplus valve 13 communicates with the A mouth of the second solenoid directional control valve 14, the T mouth of the second solenoid directional control valve 14 communicates with fuel tank 15 by oil pipe, and the P mouth of the second solenoid directional control valve 14 blocks; The oil-out of the first retaining valve 10 communicates with the oil-in of the first filtrator 9 by oil pipe, and the oil-out of the first filtrator 9 communicates respectively with the P mouth of electrohydraulic servo valve 6 and the P mouth of the first solenoid directional control valve 8 by oil pipe.
As depicted in figs. 1 and 2, the A mouth of electrohydraulic servo valve 6 communicates with the 3rd actuator port 38 of the dynamic pressure cavity 50 of two-stage servo hydraulic cylinder 26 by oil pipe, the B mouth of electrohydraulic servo valve 6 communicates with the 4th actuator port 41 of the dynamic pressure cavity 50 of two-stage servo hydraulic cylinder 26 by oil pipe, the T mouth of electrohydraulic servo valve 6 communicates with the oil-in of refrigeratory 17 by oil pipe, and the oil-out of refrigeratory 17 communicates with fuel tank 15 by the second filtrator 16.
The T mouth of the first solenoid directional control valve 8 blocks, the A mouth of the first solenoid directional control valve 8 communicates with the oil-in of the second retaining valve 7 by oil pipe, the oil-out of the second retaining valve 7 communicates with second actuator port 36 in the static pressure chamber 57 of two-stage servo hydraulic cylinder 26, A mouth and the accumulator 5 of Solenoid ball valve 18 respectively by oil pipe, first actuator port 33 in the static pressure chamber 57 of two-stage servo hydraulic cylinder 26 communicates with the oil-in of refrigeratory 17, the T mouth of Solenoid ball valve 18 communicates with the oil-in of refrigeratory 17, and the P mouth of Solenoid ball valve 18 blocks.
The working end of the dynamic pressure piston rod 64 of two-stage servo hydraulic cylinder 26 connects with one end of load transducer 24 by spring 25, the working end of the static pressure piston rod 63 of two-stage servo hydraulic cylinder 26 and one end of load transducer 24 are fixedly connected, the other end of load transducer 24 and exciting disk 23 are fixedly connected, and exciting disk 23 is pressed on roadbed 22 surfaces; In roadbed 22, be embedded with soil pressure sensor 21, acceleration transducer 20 and speed pickup 19, soil pressure sensor 21, acceleration transducer 20 and speed pickup 19 are embedded in apart from the depths of roadbed 22 surface 50～200mm; The right end cap 42 of two-stage servo hydraulic cylinder 26 connects with dipper through hole and the connecting rod through hole of hydraulic excavator by gusset 30.
The first pressure transducer 29 communicates with the 4th actuator port 41 of the dynamic pressure cavity 50 of two-stage servo hydraulic cylinder 26 by servo valve seat 34, the second pressure transducer 28 communicates with the 3rd actuator port 38 of the dynamic pressure cavity 50 of two-stage servo hydraulic cylinder 26 by servo valve seat 34, and the 3rd pressure transducer 27 communicates with second actuator port 36 in the static pressure chamber 57 of two-stage servo hydraulic cylinder 26 by servo valve seat 34, the first pressure transducer 29 is electrically connected with the A/D-7 mouth of data collecting card 2, the second pressure transducer 28 is electrically connected with the A/D-6 mouth of data collecting card 2, the 3rd pressure transducer 27 is electrically connected with the A/D-5 mouth of data collecting card 2, load transducer 24 is electrically connected with the A/D-4 mouth of data collecting card 2, soil pressure sensor 21 is electrically connected with the A/D-3 mouth of data collecting card 2, acceleration transducer 20 is electrically connected with the A/D-2 mouth of data collecting card 2, speed pickup 19 is electrically connected with the A/D-1 mouth of data collecting card 2, one end of servoamplifier 4 is electrically connected with the electromagnet of electrohydraulic servo valve 6, the other end of servoamplifier 4 is electrically connected with one end of PID controller 3, the other end of PID controller 3 is electrically connected with the D/A-1 mouth of data collecting card 2, data collecting card 2 and Computerassisted Test Software 1 are arranged in computing machine.
" a kind of two-stage servo hydraulic cylinder " (CN201110149503.1) patented technology that the two-stage servo hydraulic cylinder 26 that the present embodiment adopts is applied for for applicant, its structure is:
Two-stage servo hydraulic cylinder 26 is made up of static pressure cylinder and dynamic pressure cylinder, and the cylinder body 32 of static pressure cylinder and dynamic pressure cylinder is an entirety, and the first half of cylinder body 32 is static pressure cylinder, and latter half is dynamic pressure cylinder, between static pressure cylinder and dynamic pressure cylinder, is provided with cylinder body partition wall.
Static pressure cylinder comprises left end cap 31, static pressure piston 35 and static pressure piston rod 63; Static pressure piston rod 63 is hollow cylinder, static pressure piston rod 63 is arranged in the static pressure chamber 57 of static pressure cylinder concentrically, the working end of static pressure piston rod 63 is through left end cap 31, static pressure piston 35 is arranged on static pressure piston rod 63, one side of static pressure piston 35 is close to the shaft shoulder of static pressure piston rod 63, and spring washer 55 and nut 56 are housed on the static pressure piston rod 63 of static pressure piston 35 opposite sides; Dynamic pressure cylinder comprises right end cap 42, dynamic pressure piston 39 and dynamic pressure piston rod 64, dynamic pressure piston rod 64 is arranged in the dynamic pressure cavity 50 of dynamic pressure cylinder concentrically, dynamic pressure piston 39 is arranged on dynamic pressure piston rod 64, one side of dynamic pressure piston 39 is close to the shaft shoulder of dynamic pressure piston rod 64, and spring washer 48 and nut 47 are housed on the dynamic pressure piston rod 64 of dynamic pressure piston 39 opposite sides; The 9th O-ring seal 65, through the through hole at cylinder body partition wall center and the central through hole of static pressure piston rod 63, is equipped with in dynamic pressure piston rod 64 working end seal grooves in the working end of dynamic pressure piston rod 64; The end of dynamic pressure piston rod 64 is through right end cap 42, and mounting cup 45 is arranged on the center position of right end cap 42; One end of displacement transducer 46 is fixed on mounting cup 45, and the other end of displacement transducer 46 is inserted in the hole of dynamic pressure piston rod 64 ends.
On the cylinder body 32 of static pressure cylinder, be respectively equipped with the first actuator port 33 and the second actuator port 36 that communicate with 57 both sides, static pressure chamber, on the cylinder body 32 of dynamic pressure cylinder, be respectively equipped with the 3rd actuator port 38 and the 4th actuator port 41 that communicate with dynamic pressure cavity 50 both sides; Have the 3rd at the inwall of cylinder body partition wall central through hole and leak oily ring groove 51, the centre position place of cylinder body partition wall is provided with the 3rd and leaks the leakage hydraulic fluid port 37 that oily ring groove 51 communicates; The first actuator port 33, the second actuator port 36, the 3rd actuator port 38, the 4th actuator port 41 and leak hydraulic fluid port 37 respectively the valve port corresponding with servo valve seat 34 communicate.
The through-hole wall of left end cap 31 is provided with the oily ring groove 62 of the first leakage oil ring groove 62, the first leakage and communicates by the second oily passage 59 of leakage on the cylinder body 32 of the oily passage 61 of leakage of first on left end cap 31 and static pressure cylinder and the oily ring groove 51 of the 3rd leakage; Be provided with the oily ring groove 66 of the second leakage oil ring groove 66, the second leakage communicates by the 3rd oily passage 68 of leakage and the oily ring groove 62 of the first leakage at the inwall place of the static pressure piston rod 63 of the first leakage oil ring groove 62 correspondences.
The first width that leaks oily ring groove 62 is 1.3～1.8 times of static pressure piston 35 strokes.
The outer wall of described dynamic pressure piston 39 has 3～4 the first compensating grooves 40, on the dynamic pressure piston rod 64 of the central through hole contact portion of dynamic pressure piston rod 64 and cylinder body partition wall, have 4～5 the second compensating grooves 52, the seal groove of the annular boss outer wall of left end cap 31 is equipped with the 6th O-ring seal 58, leak in the seal bore of oily passage 61 the 8th O-ring seal 60 is housed at first of left end cap 31 end faces, the diameter in sealing hole is more than or equal to the external diameter of the 8th O-ring seal 60, the internal diameter of the 8th O-ring seal 60 is more than or equal to the diameter of the first leakage oil passage 61, left end cap 31 inner hole walls first leak in the seal groove of oily ring groove 62 both sides the 7th O-ring seal 67 are housed respectively, in two seal grooves of static pressure piston 35 outer walls, the 5th O-ring seal 53 is housed respectively, the 4th O-ring seal 54 is housed in the seal groove of static pressure piston 35 inner hole walls, the 3rd O-ring seal 49 is housed in the seal groove of dynamic pressure piston 39 inner hole walls, the first O-ring seal 43 is housed in the seal groove of the annular boss outer wall of right end cap 42, two seal grooves of right end cap 42 inner hole walls are equipped with respectively the second O-ring seal 44.
The present embodiment adopt Computerassisted Test Software 1 main flow as shown in Figure 3:
S1-1, initializing variable, timing point n=0, arranges vibrational waveform x, excited frequency f and tale points N;
The control voltage u of S1-2, D/A-1 passage output vibrational waveform x and excited frequency f;
S1-3, the cumulative n=n+1 of timing point;
S1-4, scan A/D-1, record roadbed vibration velocity Vn; Scan A/D-2, records roadbed vibration acceleration An; Scan A/D-3, records soil pressure Pn;
S1-5, judge whether n is greater than N, carry out next step if be greater than, return to S1-2 if be less than;
S1-6, taking timing point n as horizontal ordinate, taking roadbed vibration velocity Vn, roadbed vibration acceleration An and soil pressure Pn as ordinate, draw roadbed dynamic response parametric line respectively.
The test method of the roadbed dynamic response in-situ test system of the present embodiment is:
S2-1, installation, the described roadbed dynamic response of debugging in-situ test system;
S2-2, startup computing machine, open Computerassisted Test Software 1;
S2-3, starter motor 11, oil pump 12 low load operations, progressively set up the pressure of surplus valve 13 according to the static(al) of exciting force, and hydraulic system is started working;
S2-4, the electromagnet energising of giving the first solenoid directional control valve 8;
S2-5, reach after the hydrostatic power pressure value of exciting force when accumulator 5, give the electromagnet power-off of the first solenoid directional control valve 8;
S2-6, progressively set up the pressure of surplus valve 13 according to the power of exciting force;
S2-7, vibrational waveform x, excited frequency f, tale points N are set in Computerassisted Test Software 1;
S2-8, start test, wait for the result of roadbed bridge response to forced vibration;
S2-9, roadbed dynamic response parametric line deposit is printed;
S2-10, give Solenoid ball valve 18 switch on, accumulator 5 off-loads;
S2-11, disable motor 11, hydraulic system quits work;
S2-12, exit Computerassisted Test Software 1, shut down computer.
Embodiment 2
A kind of roadbed dynamic response in-situ test system and test method.Except following technical parameter, all the other are with embodiment 1.
In roadbed 22, be embedded with soil pressure sensor 21, acceleration transducer 20 and speed pickup 19 and refer to that soil pressure sensor 21, acceleration transducer 20 and speed pickup 19 are placed on apart from the depths of roadbed 22 surface 200～1000mm;
The outer wall of described dynamic pressure piston 39 has 4～5 the first compensating grooves 40, on the dynamic pressure piston rod 64 of the central through hole contact portion of dynamic pressure piston rod 64 and cylinder body partition wall, has 5～6 the second compensating grooves 52;
The first width that leaks oily ring groove 62 is 1.5～2.0 times of static pressure piston 35 strokes.
Owing to adopting technique scheme, this embodiment has following good effect:
1, this embodiment combines the advantage of site test and model test, both the load can simulate train by rail time, roadbed having been produced, can realize again the ACTIVE CONTROL of test condition, fill up the blank of track bed dynamic response in-situ test equipment, for high-speed railway subgrade DYNAMIC STABILITY provides effective tool.
2, this embodiment both can, for Ballast track roadbed dynamic response in-situ test, also can, for ballastless track roadbed dynamic response in-situ test, can also be used for track bed dynamic response simulation test.
3, in this embodiment, testing exciting waveform can be both the conventional waveforms such as sine, triangle, step and impulse function, can be also the waveform of specified function, and frequency and amplitude programmed control adjustment online.
4, this embodiment can realize the integrated automatic collection of track bed dynamic response.
Therefore, this embodiment has solved the Similar Problems of model and prototype structure, has and can realize on-the-spot prototype test, feature that again can ACTIVE CONTROL test condition.
Claims (5)
1. a roadbed dynamic response in-situ test system, it is characterized in that oil pump (12) coaxially connects with motor (11), the inlet port of oil pump (12) communicates with fuel tank (15) by oil pipe, the force feed mouth of oil pump (12) communicates respectively with the oil-in of surplus valve (13) and the oil-in of the first retaining valve (10) by oil pipe, the oil-out of surplus valve (13) communicates with fuel tank (15) by oil pipe, the control mouth of surplus valve (13) communicates with the A mouth of the second solenoid directional control valve (14), the T mouth of the second solenoid directional control valve (14) communicates with fuel tank (15) by oil pipe, the P mouth of the second solenoid directional control valve (14) blocks, the oil-out of the first retaining valve (10) communicates with the oil-in of the first filtrator (9) by oil pipe, and the oil-out of the first filtrator (9) communicates respectively with the P mouth of electrohydraulic servo valve (6) and the P mouth of the first solenoid directional control valve (8) by oil pipe,
The A mouth of electrohydraulic servo valve (6) communicates with the 3rd actuator port (38) of the dynamic pressure cavity (50) of two-stage servo hydraulic cylinder (26) by oil pipe, the B mouth of electrohydraulic servo valve (6) communicates with the 4th actuator port (41) of the dynamic pressure cavity (50) of two-stage servo hydraulic cylinder (26) by oil pipe, the T mouth of electrohydraulic servo valve (6) communicates with the oil-in of refrigeratory (17) by oil pipe, and the oil-out of refrigeratory (17) communicates with fuel tank (15) by the second filtrator (16);
The T mouth of the first solenoid directional control valve (8) blocks, the A mouth of the first solenoid directional control valve (8) communicates with the oil-in of the second retaining valve (7) by oil pipe, the oil-out of the second retaining valve (7) by oil pipe respectively with second actuator port (36) in the static pressure chamber (57) of two-stage servo hydraulic cylinder (26), the A mouth of Solenoid ball valve (18) and accumulator (5) communicate, first actuator port (33) in the static pressure chamber (57) of two-stage servo hydraulic cylinder (26) communicates with the oil-in of refrigeratory (17), the T mouth of Solenoid ball valve (18) communicates with the oil-in of refrigeratory (17), the P mouth of Solenoid ball valve (18) blocks,
The working end of the dynamic pressure piston rod (64) of two-stage servo hydraulic cylinder (26) connects with one end of load transducer (24) by spring (25), the working end of the static pressure piston rod (63) of two-stage servo hydraulic cylinder (26) and one end of load transducer (24) are fixedly connected, the other end of load transducer (24) and exciting disk (23) are fixedly connected, exciting disk (23) is pressed on roadbed (22) surface, in roadbed (22), be embedded with soil pressure sensor (21), acceleration transducer (20) and speed pickup (19), the right end cap (42) of two-stage servo hydraulic cylinder (26) connects with dipper through hole and the connecting rod through hole of hydraulic excavator by gusset (30),
The first pressure transducer (29) communicates with the 4th actuator port (41) of the dynamic pressure cavity (50) of two-stage servo hydraulic cylinder (26) by servo valve seat (34), the second pressure transducer (28) communicates with the 3rd actuator port (38) of the dynamic pressure cavity (50) of two-stage servo hydraulic cylinder (26) by servo valve seat (34), and the 3rd pressure transducer (27) communicates with second actuator port (36) in the static pressure chamber (57) of two-stage servo hydraulic cylinder (26) by servo valve seat (34), the first pressure transducer (29) is electrically connected with the A/D-7 mouth of data collecting card (2), the second pressure transducer (28) is electrically connected with the A/D-6 mouth of data collecting card (2), the 3rd pressure transducer (27) is electrically connected with the A/D-5 mouth of data collecting card (2), load transducer (24) is electrically connected with the A/D-4 mouth of data collecting card (2), soil pressure sensor (21) is electrically connected with the A/D-3 mouth of data collecting card (2), acceleration transducer (20) is electrically connected with the A/D-2 mouth of data collecting card (2), speed pickup (19) is electrically connected with the A/D-1 mouth of data collecting card (2), one end of servoamplifier (4) is electrically connected with the electromagnet of electrohydraulic servo valve (6), the other end of servoamplifier (4) is electrically connected with one end of PID controller (3), the other end of PID controller (3) is electrically connected with the D/A-1 mouth of data collecting card (2), and data collecting card (2) and Computerassisted Test Software (1) are arranged in computing machine.
2. roadbed dynamic response in-situ test system according to claim 1, is characterized in that the structure of described two-stage servo hydraulic cylinder (26) is:
Two-stage servo hydraulic cylinder (26) is made up of static pressure cylinder and dynamic pressure cylinder, the cylinder body (32) of static pressure cylinder and dynamic pressure cylinder is an entirety, the first half of cylinder body (32) is static pressure cylinder, and latter half is dynamic pressure cylinder, between static pressure cylinder and dynamic pressure cylinder, is provided with cylinder body partition wall;
Static pressure cylinder comprises left end cap (31), static pressure piston (35) and static pressure piston rod (63); Static pressure piston rod (63) is hollow cylinder, static pressure piston rod (63) is arranged in the static pressure chamber (57) of static pressure cylinder concentrically, the working end of static pressure piston rod (63) is through left end cap (31), static pressure piston (35) is arranged on static pressure piston rod (63), one side of static pressure piston (35) is close to the shaft shoulder of static pressure piston rod (63), and spring washer (55) and nut (56) are housed on the static pressure piston rod (63) of static pressure piston (35) opposite side; Dynamic pressure cylinder comprises right end cap (42), dynamic pressure piston (39) and dynamic pressure piston rod (64), dynamic pressure piston rod (64) is arranged in the dynamic pressure cavity (50) of dynamic pressure cylinder concentrically, dynamic pressure piston (39) is arranged on dynamic pressure piston rod (64), one side of dynamic pressure piston (39) is close to the shaft shoulder of dynamic pressure piston rod (64), and spring washer (48) and nut (47) are housed on the dynamic pressure piston rod (64) of dynamic pressure piston (39) opposite side; O-ring seal (65), through the through hole at cylinder body partition wall center and the central through hole of static pressure piston rod (63), is equipped with in the seal groove of dynamic pressure piston rod (64) working end in the working end of dynamic pressure piston rod (64); The end of dynamic pressure piston rod (64) is through right end cap (42), and mounting cup (45) is arranged on the center position of right end cap (42); It is upper that one end of displacement transducer (46) is fixed on mounting cup (45), and the other end of displacement transducer (46) is inserted in the hole of dynamic pressure piston rod (64) end;
On the cylinder body (32) of static pressure cylinder, be respectively equipped with the first actuator port (33) and the second actuator port (36) that communicate with both sides, static pressure chamber (57), on the cylinder body (32) of dynamic pressure cylinder, be respectively equipped with the 3rd actuator port (38) and the 4th actuator port (41) that communicate with dynamic pressure cavity (50) both sides; Have the 3rd at the inwall of cylinder body partition wall central through hole and leak oily ring groove (51), the centre position place of cylinder body partition wall is provided with the 3rd and leaks the leakage hydraulic fluid port (37) that oily ring groove (51) communicates; The first actuator port (33), the second actuator port (36),
The 3rd actuator port (38), the 4th actuator port (41) and leak hydraulic fluid port (37) respectively the valve port corresponding with servo valve seat (34) communicate;
The through-hole wall of left end cap (31) is provided with the first leakage oil ring groove (62), and first leaks oily ring groove (62) communicates by the second oily passage of leakage (59) on the cylinder body (32) of the oily passage of leakage of first on left end cap (31) (61) and static pressure cylinder and the 3rd oily ring groove of leakage (51); Inwall place at static pressure piston rod (63) corresponding to the first leakage oil ring groove (62) is provided with the second leakage oil ring groove (66), and the second oily ring groove of leakage (66) leaks oily ring groove (62) by the 3rd oily passage of leakage (68) and first and communicates;
The first width that leaks oily ring groove (62) is 1.3～2 times of static pressure piston (35) stroke.
3. roadbed dynamic response in-situ test system according to claim 1, is characterized in that in described roadbed (22), being embedded with soil pressure sensor (21), acceleration transducer (20) and speed pickup (19) refers to that soil pressure sensor (21), acceleration transducer (20) and speed pickup (19) are placed on apart from the depths of roadbed (22) surface 50～1000mm.
4. roadbed dynamic response in-situ test system according to claim 1, is characterized in that the main flow of described Computerassisted Test Software (1) is:
S1-1, initializing variable, timing point n=0, arranges vibrational waveform x, excited frequency f and tale points N;
The control voltage u of S1-2, D/A-1 passage output vibrational waveform x and excited frequency f;
S1-3, the cumulative n=n+1 of timing point;
S1-4, scan A/D-1, record roadbed vibration velocity Vn; Scan A/D-2, records roadbed vibration acceleration An; Scan A/D-3, records soil pressure Pn;
S1-5, judge whether n is greater than N, carry out next step if be greater than, return to S1-2 if be less than;
S1-6, taking timing point n as horizontal ordinate, taking roadbed vibration velocity Vn, roadbed vibration acceleration An and soil pressure Pn as ordinate, draw roadbed dynamic response parametric line respectively.
5. the test method of roadbed dynamic response in-situ test system as claimed in claim 4, is characterized in that test procedure is:
S2-1, installation, the described roadbed dynamic response of debugging in-situ test system;
S2-2, startup computing machine, open Computerassisted Test Software (1);
S2-3, starter motor (11), oil pump (12) low load operation, progressively sets up the pressure of surplus valve (13) according to the static(al) of exciting force, and hydraulic system is started working;
S2-4, the electromagnet energising of giving the first solenoid directional control valve (8);
S2-5, reach after the hydrostatic power pressure value of exciting force when accumulator (5), give the electromagnet power-off of the first solenoid directional control valve (8);
S2-6, progressively set up the pressure of surplus valve (13) according to the power of exciting force;
S2-7, vibrational waveform x, excited frequency f, tale points N are set in Computerassisted Test Software (1);
S2-8, start test, wait for the result of roadbed bridge response to forced vibration;
S2-9, roadbed dynamic response parametric line deposit is printed;
S2-10, give Solenoid ball valve (18) energising, accumulator (5) off-load;
S2-11, disable motor (11), hydraulic system quits work;
S2-12, exit Computerassisted Test Software (1), shut down computer.
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| CN103308401B (en) * | 2013-07-01 | 2014-10-01 | 浙江大学 | Preparation method for railway road bed large-week acceleration loading physical model test device |
| CN103511004B (en) * | 2013-09-17 | 2015-05-13 | 上海新力机器厂 | Closed electro-hydraulic actuator and assembly of closed electro-hydraulic actuator |
| CN104634650A (en) * | 2014-12-06 | 2015-05-20 | 武汉科技大学 | Vibration excitation device with magnetic force centering function for roadbed dynamic response test |
| CN104897457B (en) * | 2015-04-09 | 2018-02-02 | 中交第二公路勘察设计研究院有限公司 | A kind of test method and system of on-the-spot test roadbed dynamic response |
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| CN109708837A (en) * | 2018-12-29 | 2019-05-03 | 上海核工程研究设计院有限公司 | A kind of high energy pipeline whipping simulation test bench system |
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| CN101441122B (en) * | 2008-12-11 | 2010-12-08 | 武汉科技大学 | Test system and test method of servo hydraulic cylinder idle load start-up friction force |
| CN101451893B (en) * | 2008-12-25 | 2010-09-08 | 武汉科技大学 | Test system and test method for hydraulic cylinder with loading friction force characteristic |
| CN101463847B (en) * | 2008-12-31 | 2010-11-10 | 武汉科技大学 | Load frequency response test system and method for hydraulic cylinder |
| CN101787716B (en) * | 2010-03-10 | 2011-04-13 | 温州大学 | Model test apparatus for studying dynamic response and long-term settlement law of high-speed railway |
| CN101979883B (en) * | 2010-10-21 | 2013-01-16 | 武汉科技大学 | Loaded piston deflection test system and test method for large-sized servo hydraulic cylinder |
| CN102108656B (en) * | 2010-12-18 | 2012-05-09 | 浙江大学 | System for kinetic model test of ballastless track subgrade of high-speed railway |
| CN102261359B (en) * | 2011-06-03 | 2013-09-11 | 中国科学院武汉岩土力学研究所 | Servo-control hydraulic excitation system for high-speed rail track roadbed test |
| CN202486004U (en) * | 2012-03-07 | 2012-10-10 | 武汉科技大学 | In-situ shock excitation test system for dynamic response of roadbed |
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