CN115076164A - Onboard hydraulic servo high-frequency earthquake simulation experiment test platform of centrifugal machine - Google Patents
Onboard hydraulic servo high-frequency earthquake simulation experiment test platform of centrifugal machine Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
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- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
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- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
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- G01M7/00—Vibration-testing of structures; Shock-testing of structures
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Abstract
The invention discloses a centrifuge airborne hydraulic servo high-frequency earthquake simulation experiment test platform, which comprises a pressure regulating and stabilizing unit, a filtering unit, an energy accumulator unit, a servo actuator unit, a supporting guide rail unit, a loading platform unit and a test and control unit, wherein the pressure regulating and stabilizing unit is connected with the filtering unit; the servo actuator unit comprises a pressure sensor, an actuator displacement sensor and an acceleration sensor. The experiment table can effectively reproduce high-frequency acceleration test signals required under the high-gravity environment of civil engineering, can reproduce sine waves, triangular waves, random waves and other high-frequency acceleration waveform signals, has the advantages of being high in waveform reproduction precision and high in system bandwidth, and the loading platform can be additionally provided with an inertial load or a high-degree-of-freedom elastic load according to actual requirements so as to simulate different experiment working conditions.
Description
Technical Field
The invention relates to the field of civil engineering hypergravity experiment tests, in particular to a centrifuge airborne hydraulic servo high-frequency earthquake simulation experiment test platform.
Background
The natural disasters in the world occur occasionally, and the personal and property safety is threatened all the time. Therefore, the method is very important for the pre-research work of the disaster resistance and mechanism of the building. The electro-hydraulic vibration table is used as a key device for engineering test, and is widely applied to many important engineering fields such as house anti-seismic experiments, bridge fatigue tests, material reliability detection and the like due to large output force and high frequency response.
In the research of geotechnical seismic engineering and soil dynamics, unit body tests, reduced scale model tests and field in-situ tests are common research modes, wherein the reduced scale model tests are more flexible and effective in the aspects of revealing process mechanisms, verifying scientific theories and solving engineering technical problems. Because phenomena such as physics, mechanics, chemistry and the like and changing characteristics change along with the gravity level, a reduced scale model of a conventional gravity field cannot generate a stress field which is the same as that of a prototype, the characteristics of the prototype cannot be accurately reproduced, and the realization of an equivalent prototype by using a supergravity technology is the most common and effective research means.
The dynamic centrifugal model test technology is a high and new technology which is rapidly developed in recent years and is used for researching geotechnical engineering earthquakes, wherein a geotechnical centrifuge vibrating table system is a main test device. The geotechnical centrifuge places high-scale-ratio models such as foundations, geotechnical structures and the like in a supergravity environment formed by high-speed rotation of a rotating arm of the centrifuge, and reproduces actual deformation and damage mechanisms in geotechnical seismic engineering by accurately reproducing the conditions of prototype dead weight stress. In addition, the dynamic characteristics and the failure mechanism of the prototype foundation and the rock-soil body under the condition of real seismic waves can be accurately reproduced by applying equivalent compressed seismic waves on the model through the vibration table.
The geotechnical centrifuge shaking table model test technology can ensure that the model has equal stress, similar deformation and the same failure mechanism with the prototype, can reasonably simulate the static and dynamic stress strain field of the prototype soil body, accurately reappear the dynamic response of the rock-soil body, reveal the objective law and verify the theoretical model. The research on the vibration table is the central importance of the whole centrifugal test system, and the research on the vibration table also relates to the comprehensive fields of machinery, electronics, hydraulic pressure, control and the like.
Disclosure of Invention
The invention provides a centrifuge airborne hydraulic servo high-frequency earthquake simulation experiment test platform, which meets the experiment requirement of high-frequency earthquake wave vibration reproduction required in the field of civil engineering under the super-gravity environment.
The purpose of the invention is realized by the following technical scheme:
a centrifugal machine airborne hydraulic servo high-frequency earthquake simulation experiment test platform is used for reproducing earthquake waveforms in a supergravity environment and comprises a support, a low-pressure energy accumulator, a pressure sensor I, a pressure sensor II, an actuator support frame, a connecting support, a load, an acceleration sensor, a vibration table surface, a slide block guide rail, a vibration table base, a servo valve I, a servo valve II, an actuator valve body, a proportional overflow valve, a pressure stabilizing valve body, an oil return filter, an oil inlet filter, a displacement sensor, a high-pressure energy accumulator and a static pressure support oil cylinder;
the support and the vibration table base are fixed on the ground;
the pressure stabilizing valve body is fixed on the bracket, the oil inlet filter, the oil return filter and the proportional overflow valve are all installed and fixed on the pressure stabilizing valve body, the pressure stabilizing valve body is provided with an oil inlet, an oil outlet and an oil return port, and the pressure stabilizing valve body is externally connected with a hydraulic oil source;
the vibration table comprises a vibration table base, a vibration table top and a sliding block guide rail, wherein the sliding block guide rail is fixedly connected to the vibration table base; the load, the acceleration sensor and the connecting support are all rigidly connected with the vibration table top, and the acceleration sensor is used for measuring the acceleration waveform of the vibration table top in the vibration process;
the actuator support is also fixed on the vibration table base, the cylinder body of the static pressure supporting oil cylinder is fixedly connected with the actuator support, and the piston rod of the static pressure supporting oil cylinder penetrates through the opening on the actuator support frame to be fixedly connected with the connecting support; the static pressure support oil cylinder is divided into two oil cavities by a piston rod, and the two oil cavities are used as a high-pressure cavity and a low-pressure cavity according to conditions; the displacement sensor is fixedly arranged on a piston rod in the static pressure support oil cylinder and is used for detecting the displacement of the piston rod of the static pressure support oil cylinder;
the actuator valve body is fixedly connected above the static pressure supporting oil cylinder, and the servo valve I and the servo valve II are fixed on the actuator valve body in parallel; the first pressure sensor and the second pressure sensor are fixed on the actuator valve body and are respectively used for detecting the pressure of two oil cavities of the static pressure support oil cylinder; the low-pressure energy accumulator and the high-pressure energy accumulator are fixed on the side surface of the actuator valve body, and the high-pressure energy accumulator is connected to an oil inlet pipeline and is positioned at the downstream of the oil inlet filter; the low-pressure accumulator is positioned on the oil return path and is positioned at the upstream of the oil return filter;
the actuator valve body is connected with the oil port corresponding to the pressure stabilizing valve body through a hydraulic hose;
the hydraulic oil provided by the hydraulic oil source sequentially passes through the pressure stabilizing valve body, the proportional overflow valve and the oil inlet filter, then enters the high-pressure accumulator and the actuator valve body, then passes through the servo valve I and the servo valve II which are connected in parallel, enters the high-pressure cavity of the static pressure supporting oil cylinder, extrudes the piston rod to move, and meanwhile, the oil in the low-pressure cavity of the static pressure supporting oil cylinder enters the pressure stabilizing valve body after passing through the low-pressure accumulator and finally returns to the oil return port of the hydraulic oil source.
Furthermore, the test platform also comprises a test and control unit, and the test and control unit comprises a real-time end controller and an upper computer; the real-time end controller is electrically connected with the first pressure sensor, the second pressure sensor, the displacement sensor and the acceleration sensor;
the real-time end controller comprises a real-time controller and an FPGA module; the FPGA module acquires analog signals of all the sensors through the acquisition board card, the sensor signals are converted into digital signals capable of being processed by the FPGA through digital-to-analog conversion of the acquisition board card, and the FPGA module carries out filtering processing on the digital signals and sends the filtered digital signals to the real-time controller; meanwhile, the FPGA module receives related control signals of the real-time controller, and the related control signals comprise servo valve control signals and proportional overflow valve control signals;
the real-time controller is internally provided with a filtering algorithm, a displacement control algorithm and an acceleration control algorithm and is used for communicating with the FPGA module and the upper computer and receiving related control instructions of the upper computer, wherein the related control instructions comprise a pressure control instruction and a reference acceleration waveform signal; meanwhile, the real-time controller transmits the sensor data to the upper computer in real time for real-time observation of the upper computer;
and the upper computer is used for receiving the signal of the real-time controller and sending a corresponding control instruction to the real-time controller.
Further, the test platform includes a pump station that serves as a source of hydraulic oil.
The invention has the following beneficial effects:
(1) compared with the characteristic of low working bandwidth of the constant gravity vibration table, the working bandwidth of the hypergravity vibration table is far higher than that of the constant gravity vibration table, and therefore the onboard hydraulic servo high-frequency earthquake simulation experiment test platform of the centrifuge is introduced with the double-valve parallel system on the basis of single-valve driving of the original constant gravity vibration table, the system bandwidth characteristic can be effectively improved, and accurate reproduction of high-frequency earthquake waves is achieved. Through certain state feedback and feedforward compensation control, the bandwidth of the vibration table can reach about 100 Hz.
(2) The onboard hydraulic servo high-frequency earthquake simulation experiment test platform for the centrifuge can load an inertia load or a high-degree-of-freedom elastic load according to specific requirements and perform a stable experiment, so that the actual working conditions in the field of civil engineering can be well reproduced, and the related special working condition requirements are met.
(3) The onboard hydraulic servo high-frequency earthquake simulation experiment test platform of the centrifuge can gradually realize high-precision high-frequency acceleration waveform reproduction through continuous iteration of the experiment process.
Drawings
Fig. 1 is a schematic diagram 1 of a centrifuge onboard hydraulic servo high-frequency earthquake simulation experiment test platform according to an embodiment of the invention.
Fig. 2 is a schematic diagram 2 of a centrifuge onboard hydraulic servo high-frequency earthquake simulation experiment test platform according to an embodiment of the invention.
Fig. 3 is a schematic diagram 3 of a centrifuge onboard hydraulic servo high-frequency earthquake simulation experiment test platform according to an embodiment of the invention.
FIG. 4 is a schematic flow path diagram.
In the figure, 1-stent; 2-a low pressure accumulator; 3-a pressure sensor I; 4-a second pressure sensor; 5-an actuator support frame; 6-connecting a bracket; 7-load; 8-an acceleration sensor; 9-vibrating the table top; 10-a slider guide; 11-a vibration table base; 12-a servo valve one; 13-a second servo valve; 14-an actuator valve body; 15-proportional relief valve; 16-a pressure-stabilizing valve body; 17-an oil return filter; 18-an oil inlet filter; 19-a displacement sensor; 20-a high pressure accumulator; 21-static pressure support oil cylinder.
Detailed Description
The technical solutions in the embodiments of the present invention will be described in detail below with reference to the accompanying drawings in the embodiments of the present invention, and the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments that can be obtained by a person skilled in the art without making creative efforts based on the embodiments of the present invention belong to the protection scope of the present invention.
Fig. 1 illustrates the overall structure composition of a centrifuge onboard hydraulic servo high-frequency earthquake simulation experiment test platform, which shows the overall structure and spatial layout of the centrifuge onboard hydraulic servo high-frequency earthquake simulation experiment test platform, excluding the system general pump station structure and the system electric control system part; fig. 2 and 3 illustrate specific components of a centrifuge-mounted hydraulic servo high-frequency earthquake simulation experiment test platform.
As shown in fig. 1 to 3, the onboard hydraulic servo high-frequency earthquake simulation experiment testing platform for the centrifuge of the embodiment of the invention comprises a support 1, a low-pressure energy accumulator 2, a pressure sensor I3, a pressure sensor II 4, an actuator support frame 5, a connecting support 6, a load 7, an acceleration sensor 8, a vibration table top 9, a slide block guide rail 10, a vibration table base 11, a servo valve I12, a servo valve II 13, an actuator valve body 14, a proportional overflow valve 15, a pressure stabilizing valve body 16, an oil return filter 17, an oil inlet filter 18, a displacement sensor 19, a high-pressure energy accumulator 20 and a static pressure supporting oil cylinder 21.
Wherein, support 1 and shaking table base 11 are fixed in ground, and shaking table base 11 is fixed through rag bolt and ground, guarantees that the platform has sufficient recoil quality at vibration test's in-process, and then guarantees the normal work of platform.
The pressure stabilizing valve body 16 is fixed on the bracket 1, the bracket 1 provides a supporting function for the pressure stabilizing valve body, and the high-pressure filter 18, the low-pressure filter 17 and the proportional overflow valve 15 are all fixed on the pressure stabilizing valve body 16 through bolts. The slide block guide rail 10 is rigidly fixed with the vibration table base 11, the vibration table top 9 is rigidly connected with the slide block in the slide block guide rail 10, the vibration table top can move back and forth along the guide rail, and the direction is also the vibration direction of the vibration table. The low friction characteristic of the guide rail slider mechanism 10, which is used for supporting the vibration table top 9, of the vibration table base 11 is beneficial to ensuring the reproduction precision of relevant waveforms of the system during high-frequency vibration. The load 7, the acceleration sensor 8 and the connecting bracket 6 are rigidly connected with the vibration table 9. The load 7 can be set according to actual requirements and is an inertial load or a related high-degree-of-freedom elastic load. The acceleration sensor 8 is used for measuring the acceleration waveform of the vibration table 9 in the vibration process, thereby providing a necessary condition for the acceleration waveform reproduction function of the system. The acceleration sensor 8 can be used for a vibration table system to form a corresponding acceleration open-loop control system or acceleration closed-loop control system, and provides conditions for high-frequency high-precision acceleration waveform reproduction of the vibration table.
The actuator support 5 is rigidly connected with the vibrating table base 11, the cylinder body of the static pressure supporting oil cylinder 21 is rigidly connected with the actuator support 5, and the piston rod of the static pressure supporting oil cylinder 21 passes through the opening hole in the actuator support frame 5 and is rigidly connected with the connecting support 6 through a nut. The hydrostatic support cylinder 21 includes two oil chambers, serving as a high-pressure chamber and a low-pressure chamber as the case may be. The actuator valve body 14 is arranged above the static pressure supporting oil cylinder 21, the first servo valve 12 and the second servo valve 13 are fixed on the upper surface of the actuator valve body 14 in parallel, and the first pressure sensor 3, the second pressure sensor 4, the low-pressure energy accumulator 2 and the high-pressure energy accumulator 20 are all fixed on the side surface of the actuator valve body 14. The first pressure sensor 3 and the second pressure sensor 4 are respectively used for detecting pressure changes of the two cavities of the static pressure support oil cylinder 21 in the vibration process, and the pressure changes can also be used as control state quantities in a system state feedback control algorithm, so that the implementation of a system state feedback control scheme is facilitated. The high pressure chamber and the low pressure chamber of the hydrostatic support cylinder 21 are determined by the spool positions of the hydraulic servo valves 12, 13. The actuator valve body 14 is connected with the pressure stabilizing valve body 16 through a hydraulic hose, the displacement sensor 19 is rigidly mounted on a piston rod inside the static pressure supporting oil cylinder 21, and the displacement sensor 19 is used for monitoring the displacement of the vibration table top 9. The displacement sensor 19 can also be used to construct a displacement feedback control for the system, to ensure the stability of the system, and other initial conditions required by the algorithm.
As shown in fig. 4, a pump source is provided by a general pump station, a hydraulic oil source is output by the pump station, passes through a pressure stabilizing valve body 16, a proportional overflow valve 15 and an oil inlet filter 18, enters a high pressure accumulator 20 and an actuator valve body 14, passes through a first servo valve 12 and a second servo valve 13 which are connected in parallel, enters a high pressure cavity of a static pressure support cylinder 21, the high pressure cavity and a low pressure cavity of the static pressure support cylinder 21 are determined by the positions of valve cores of the hydraulic servo valves 12 and 13, and simultaneously, oil in a low pressure cavity of the static pressure support cylinder 21 passes through a low pressure accumulator 17, enters the pressure stabilizing valve body 16, and finally returns to an oil return port of the general pump station.
The oil inlet filter 18 and the oil return filter 17 form a filtering unit, a hydraulic oil source enters the oil inlet filter 18 through the proportional overflow valve 15 to be filtered, and the existence of the oil inlet filter 18 ensures that the cleanliness of the oil entering the servo actuator unit can meet the working requirement of the servo actuator unit; the return oil filter 17 is present in the system return oil circuit, and the hydraulic oil source returns to the pump source oil tank after being filtered by the return oil filter 17.
The high-pressure accumulator 20 and the low-pressure accumulator 2 form an accumulator unit, the high-pressure accumulator 20 is communicated with a high-pressure oil way of the system, pressure fluctuation of a system pressure source can be effectively eliminated due to the existence of the high-pressure accumulator 20, and meanwhile, certain energy can be provided to meet the requirements of certain special working conditions in the system vibration process in the high-frequency vibration process of the system; the low-pressure energy accumulator 2 is communicated with a system oil return path, and the existence of the low-pressure energy accumulator 2 can stabilize the pressure fluctuation existing in the low-pressure oil path of the system.
The servo actuator unit is composed of a first servo valve 12, a second servo valve 13, an actuator valve block 14 and a static pressure support oil cylinder 21, the oil paths of the first servo valve 12 and the second servo valve 13 are connected in parallel through the oil path design in the actuator valve block 14, a hydraulic oil source enters an oil chamber on one side of the static pressure support oil cylinder after passing through the two parallel servo valves, and the other oil chamber is communicated with an oil return path; the static pressure support oil cylinder 21 can effectively reduce the friction force between the oil cylinder rod and the cylinder wall, so that the device is less influenced by the friction force, and the high-precision acceleration waveform reproduction function can be realized.
The test platform for the onboard hydraulic servo high-frequency earthquake simulation experiment of the centrifuge further comprises a test and control unit, wherein the test and control unit comprises a real-time end controller and an upper computer, and the real-time end controller comprises a real-time controller (cRIO-9035) and an FPGA module;
the FPGA module acquires analog signals of all the sensors through the acquisition board card, the sensor signals are converted into digital signals which can be processed by the FPGA through digital-to-analog conversion of the acquisition board card, the FPGA module carries out filtering processing on the digital signals and sends the filtered digital signals to the real-time controller (cRIO-9035);
meanwhile, the FPGA module receives related control signals of a real-time controller (cRIO-9035), which mainly comprise servo valve control signals and proportional overflow valve control signals;
the real-time controller (cRIO-9035) is used for communicating with the FPGA module and also has a function of communicating with an upper computer, mainly receives control instructions related to the upper computer, mainly comprises pressure control instructions, reference acceleration waveform signals and the like, and simultaneously transmits sensor data to the upper computer in real time for real-time observation of the upper computer;
the algorithm contained in the real-time controller (cRIO-9035) mainly comprises a signal generator (used for converting an acceleration signal into a displacement signal and performing low-pass filtering), a displacement controller (mainly realized by a control mode based on LQR/LTR, so that the system is stabilized and the dynamic characteristics of the system, such as response time, overshoot and steady-state error, are improved), and an acceleration controller (because an accurate acceleration waveform reproduction function is realized, the requirement cannot be met only through displacement closed-loop precision, an iterative control strategy taking system gradient as an optimization operator is introduced on the basis of displacement closed-loop, and the control precision of the system is further improved through iterative control).
The upper computer is used for receiving the signal of the real-time controller (cRIO-9035) and sending a corresponding control instruction to the real-time controller (cRIO-9035).
The centrifuge airborne hydraulic servo high-frequency earthquake simulation experiment test platform aims to reproduce earthquake waveforms (acceleration waveforms) in a supergravity environment, the earthquake waveform frequency is lower under the condition of normal gravity and is generally between 0.1 and 10Hz, when the centrifuge airborne hydraulic servo high-frequency earthquake simulation experiment test platform works in the supergravity environment, due to the existence of supergravity, a corresponding scaling effect exists, due to the existence of the scaling effect, related experiments of civil engineering can simulate geological simulation experiments for a very long time under the condition of normal gravity through high-frequency vibration experiments in a very short time, and due to the existence of the supergravity environment, low-frequency acceleration vibration waveforms under the normal gravity are amplified by dozens of times, so that original high-frequency experiment signals of a high-frequency vibration test platform are generated.
The conventional control system of the constant gravity vibration table is generally a three-state control system, the natural frequency of the system is improved by introducing speed feedback due to the characteristic of low natural frequency of the system, but the introduction of the speed feedback can cause the reduction of the damping of the system, so that acceleration feedback is further introduced, the damping of the system can be improved by introducing the acceleration feedback control, the stable near virtual axis pole of the system is eliminated by further introducing three-state feedforward control on the basis of the three-state feedback control, the dynamic performance of the system is further improved, but because the natural frequency of the super-gravity vibration table is very high, effective factors for limiting the bandwidth of the system are mainly concentrated on the working bandwidth limitation of a servo valve, the introduction of the speed feedback cannot effectively improve the dynamic performance of the system, meanwhile, the damping is lower compared with that of the super-gravity vibration table of the constant gravity vibration table, and the introduction of the speed feedback and the acceleration feedback cannot well improve the damping characteristic of the system, therefore, the feedback control of the supergravity vibration table introduces an LQR control mode, achieves a satisfactory control effect through the repair effect of LTR, and simultaneously controls the displacement of the vibration table through three-state feedback control relative to a normal gravity vibration table so as to realize acceleration reproduction of the vibration table.
The method for testing by using the onboard hydraulic servo high-frequency earthquake simulation experiment test platform of the centrifuge mainly comprises the following steps:
step1, starting the real-time end controller, randomly starting the real-time end control panel program, starting the upper computer control program again to ensure the normal communication connection between the upper computer and the real-time end controller, and observing the real-time data acquisition module of the upper computer to ensure the normal work of the sensor system;
step2, starting the universal pump source to ensure the system has normal hydraulic energy supply, adjusting the control input voltage of the proportional amplifying plate through the upper computer pressure control unit after the oil source is connected, further adjusting the coil current of the proportional overflow valve to further control the pressure of the system, adjusting the pressure of the system to reach a set value of 21Mpa, and keeping the pressure source stable;
step 3: after pressure adjustment is finished, introducing a PI controller under the premise of displacement closed loop, adjusting the system to a zero position through the adjusting action of the PI controller, and keeping the system stable, wherein the steady-state error of the system is less than 0.01 mm;
step4, an operator constructs Step waveforms, sine waveforms or reads specific random waveform files through a waveform reading module of the upper computer, and previews vibration waveforms on an interface of the upper computer to ensure the correctness of input waveforms;
step5, after the vibration waveform preview is finished, an operator can send waveform data to a real-time end controller (the real-time end control period is 100us) through an upper computer sending module, the real-time end controller consists of a real-time controller with the timing precision of 1us and an FPGA module with the timing precision of 1ns, the FPGA module ensures the quick operation of related digital signal processing work, such as filtering, speed synthesis and the like, and further provides a larger algorithm control period ratio for the algorithm of the real-time end, a displacement ring in the vibration process adopts an LQG/LTR control technology, and the system displacement ring control enters a PI control environment again after the vibration is finished;
step6, after completing a vibration experiment, if the reproduction precision of the acceleration waveform can not meet the experiment requirement, the vibration experiment can be carried out again, acceleration open-loop iteration control is introduced in the process of the experiment again, the acceleration open-loop control uses a system simplified accompanying system to construct a corresponding gradient operator, uses the gradient operator and the vibration reproduction error of the last system to update the current system input, and inputs the updated input to the vibration table again to carry out the iteration experiment until the control precision requirement is met;
step 7: through a plurality of iterative experiment processes, after the waveform reproduction precision of the acceleration meets the experiment requirements of operators, the upper computer file storage unit can be used for storing the relevant vibration waveform files in the appointed path;
and Step8, after the vibration experiment is finished, the system pressure can be relieved through the upper computer pressure control unit, the upper computer program is closed after the universal pump source is closed, the communication between the real-time end and the upper computer is automatically disconnected, the real-time end continues to operate under the condition of no power failure, and the next access of the upper computer is waited for the execution of other experiments.
The centrifuge airborne hydraulic servo high-frequency earthquake simulation experiment test platform aims at reproducing earthquake waveforms (acceleration waveforms) in a supergravity environment, the earthquake waveform frequency is low under the condition of normal gravity, generally ranges from 0.1 Hz to 10Hz, when the centrifuge airborne hydraulic servo high-frequency earthquake simulation experiment test platform works in the supergravity environment,
due to the existence of the supergravity, the corresponding scale shrinkage effect exists, and due to the existence of the scale shrinkage effect, under the supergravity environment, the related experiment of the civil engineering can simulate the geological simulation experiment for a very long time under the condition of the normal gravity through the high-frequency vibration experiment within a very short time, because
In the presence of a supergravity environment, the low-frequency acceleration vibration waveform under normal gravity is amplified by dozens of times, so that an original high-frequency experiment signal of a high-frequency vibration test bed is generated.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and although the invention has been described in detail with reference to the foregoing examples, it will be apparent to those skilled in the art that various changes in the form and details of the embodiments may be made and equivalents may be substituted for elements thereof. All modifications, equivalents and the like which come within the spirit and principle of the invention are intended to be included within the scope of the invention.
Claims (3)
1. A test platform for a centrifugal machine-mounted hydraulic servo high-frequency earthquake simulation experiment is characterized by being used for reproducing earthquake waveforms in a supergravity environment and comprising a support, a low-pressure energy accumulator, a pressure sensor I, a pressure sensor II, an actuator support frame, a connecting support, a load, an acceleration sensor, a vibration table surface, a slide block guide rail, a vibration table base, a servo valve I, a servo valve II, an actuator valve body, a proportional overflow valve, a pressure stabilizing valve body, an oil return filter, an oil inlet filter, a displacement sensor, a high-pressure energy accumulator and a static pressure supporting oil cylinder;
the support and the vibration table base are fixed on the ground;
the pressure stabilizing valve body is fixed on the bracket, the oil inlet filter, the oil return filter and the proportional overflow valve are all installed and fixed on the pressure stabilizing valve body, the pressure stabilizing valve body is provided with an oil inlet, an oil outlet and an oil return port, and the pressure stabilizing valve body is externally connected with a hydraulic oil source;
the vibration table comprises a vibration table base, a vibration table top and a sliding block guide rail, wherein the sliding block guide rail is fixedly connected to the vibration table base; the load, the acceleration sensor and the connecting support are all rigidly connected with the vibration table top, and the acceleration sensor is used for measuring the acceleration waveform of the vibration table top in the vibration process;
the actuator support is also fixed on the vibration table base, the cylinder body of the static pressure supporting oil cylinder is fixedly connected with the actuator support, and the piston rod of the static pressure supporting oil cylinder penetrates through the opening on the actuator support frame to be fixedly connected with the connecting support; the static pressure support oil cylinder is divided into two oil cavities by a piston rod and is used as a high-pressure cavity and a low-pressure cavity according to conditions; the displacement sensor is fixedly arranged on a piston rod in the static pressure support oil cylinder and is used for detecting the displacement of the piston rod of the static pressure support oil cylinder;
the actuator valve body is fixedly connected above the static pressure supporting oil cylinder, and the servo valve I and the servo valve II are fixed on the actuator valve body in parallel; the first pressure sensor and the second pressure sensor are fixed on the actuator valve body and are respectively used for detecting the pressure of two oil cavities of the static pressure support oil cylinder; the low-pressure energy accumulator and the high-pressure energy accumulator are both fixed on the side surface of the actuator valve body, and the high-pressure energy accumulator is connected to an oil inlet path and is positioned at the downstream of the oil inlet filter; the low-pressure accumulator is positioned on the oil return path and is positioned at the upstream of the oil return filter;
the actuator valve body is connected with the oil port corresponding to the pressure stabilizing valve body through a hydraulic hose;
the hydraulic oil provided by the hydraulic oil source sequentially passes through the pressure stabilizing valve body, the proportional overflow valve and the oil inlet filter, then enters the high-pressure accumulator and the actuator valve body, then passes through the servo valve I and the servo valve II which are connected in parallel, enters the high-pressure cavity of the static pressure supporting oil cylinder, extrudes the piston rod to move, and meanwhile, the oil in the low-pressure cavity of the static pressure supporting oil cylinder enters the pressure stabilizing valve body after passing through the low-pressure accumulator and finally returns to the oil return port of the hydraulic oil source.
2. The test platform for the onboard hydraulic servo high-frequency earthquake simulation experiment of the centrifuge as claimed in claim 1, wherein the test platform further comprises a test and control unit, and the test and control unit comprises a real-time end controller and an upper computer; the real-time end controller is electrically connected with the first pressure sensor, the second pressure sensor, the displacement sensor and the acceleration sensor;
the real-time end controller comprises a real-time controller and an FPGA module; the FPGA module acquires analog signals of all the sensors through the acquisition board card, the sensor signals are converted into digital signals capable of being processed by the FPGA through digital-to-analog conversion of the acquisition board card, and the FPGA module carries out filtering processing on the digital signals and sends the filtered digital signals to the real-time controller; meanwhile, the FPGA module receives related control signals of the real-time controller, and the related control signals comprise servo valve control signals and proportional overflow valve control signals;
the real-time controller is internally provided with a filtering algorithm, a displacement control algorithm and an acceleration control algorithm, is used for communicating with the FPGA module and the upper computer, and receives related control instructions of the upper computer, including a pressure control instruction and a reference acceleration waveform signal; meanwhile, the real-time controller transmits the sensor data to the upper computer in real time for real-time observation of the upper computer;
and the upper computer is used for receiving the signal of the real-time controller and sending a corresponding control instruction to the real-time controller.
3. The centrifuge-onboard hydraulic servo high-frequency seismic simulation experiment test platform according to claim 1, wherein the test platform comprises a pump station, and the pump station is used as a hydraulic oil source.
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| CN202210522909.8A CN115076164B (en) | 2022-05-13 | Test platform for centrifugal machine airborne hydraulic servo high-frequency earthquake simulation experiment |
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| CN117108593A (en) * | 2023-10-23 | 2023-11-24 | 莱州兴达液压机械科技有限公司 | Hydraulic mechanical locking oil cylinder simulation test device |
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