Six-degree-of-freedom hybrid test system based on OpenSees-OpenFresnel-MTS-LBCB and use method of six-degree-of-freedom hybrid test system

Abstract

The invention discloses a six-degree-of-freedom hybrid test system based on OpenSees-OpenFresco-MTS-LBCB and a use method of the six-degree-of-freedom hybrid test system, and belongs to the field of civil engineering tests. The system comprises OpenSees finite element software, an OpenFresco hybrid test platform, MTS CSI software, an MTS 793 control software DOF module, an MTS controller and an LBCB six-degree-of-freedom loading control system. According to the six-degree-of-freedom hybrid test system based on OpenSees-OpenFresco-MTS-LBCB and the use method thereof, an OpenSees-OpenFresco-MTS hybrid test architecture is adopted, and an LBCB six-degree-of-freedom loading control system is combined, so that a multi-degree-of-freedom hybrid test is realized, and meanwhile, the system is simple in architecture, economical and feasible, clear in data transmission path and high in reliability. And the reliability is high, and the hybrid test capability of the LBCB system is expanded.

Description

Technical Field

[0001] The invention belongs to the field of civil engineering experiments, and in particular relates to a six-degree-of-freedom hybrid test system based on OpenSees-OpenFresco-MTS-LBCB and a use method thereof. Background Art

[0002] In the study of engineering structures, it is crucial to accurately test the performance of the structure in the actual working environment. When an engineering structure is subjected to an earthquake, structural components such as columns, walls, and beams are subjected to spatial forces and are usually subjected to complex multi-directional loading. Their force behavior can be decomposed into six degrees of freedom: X, Y, Z, RX, RY, and RZ in the Cartesian coordinate system. Therefore, it is necessary to conduct a study on the spatial force behavior of structural components.

[0003] There are some shortcomings in the existing technology for using six-degree-of-freedom test systems for stress analysis and performance testing of engineering structures, which are mainly manifested in two aspects: on the one hand, the system architecture is complex, the construction and operation costs are high, and its complexity requires the operator to have advanced technical knowledge and experience; on the other hand, the hybrid experimental capability is not strong, and it is impossible to achieve an organic combination of experiments and simulation calculations, and there is a lack of connection between the control system, communication method and finite element model process selected for the entire process. Summary of the invention

[0004] In order to solve the above problems in the prior art, the present invention provides a six-degree-of-freedom hybrid test system based on OpenSees-OpenFresco-MTS-LBCB and a method for using the system. The system adopts the OpenSees-OpenFresco-MTS hybrid test architecture and combines the LBCB six-degree-of-freedom loading control system to achieve an organic combination of test and simulation calculation. At the same time, the system architecture is simple, economically feasible, with a clear data transmission path, strong reliability, and expands the hybrid test capability of the LBCB system, which can reproduce the spatial force behavior characteristics of structural components under real earthquakes. .

[0005] To achieve the above purpose, the present invention provides a six-degree-of-freedom hybrid test system based on OpenSees-OpenFresco-MTS-LBCB and a method for using the system. The specific technical solution is as follows:

[0006] A six-degree-of-freedom hybrid test system based on OpenSees-OpenFresco-MTS-LBCB, including:

[0007] OpenSees finite element software, used to build engineering structure calculation models and analyze data;

[0008] OpenFresco hybrid test platform, used to convert the global coordinate system in the finite element and the global Cartesian coordinate system of the control system and define various test control parameters;

[0009] MTS CSI software is used to establish the degree of freedom mapping relationship corresponding to the parameters defined in the MTS 793 control software and OpenFresco interface software and perform unit conversion;

[0010] MTS 793 control software DOF module, used to decompose the displacement motion in the overall Cartesian coordinate system into the elongation of multiple actuators, and output the displacement command to the external command control channel of the actuator in the control system;

[0011] MTS controller, used to connect LBCB control software and LBCB control system and exchange data with them;

[0012] LBCB six-degree-of-freedom loading control system is used to simulate the response under real earthquakes and record and transmit the space and load in the overall Cartesian coordinate system.

[0013] Optionally, the LBCB six-degree-of-freedom loading control system comprises:

[0014] LBCB controller, used to send displacement motion commands and record and transmit the elongation and load of the six actuators;

[0015] LBCB loading device, used to execute displacement motion commands.

[0016] Optionally, the OpenSees finite element software performs bidirectional data transmission with the MTS 793 control software DOF module and the MTS controller via the OpenFresco hybrid test platform and the MTS CSI software.

[0017] Optionally, the MTS controller and the LBCB six-degree-of-freedom loading control system realize two-way data interaction between the MTS controller and the LBCB controller through external data input and internal data output functions.

[0018] Optionally, the MTS 793 control software DOF module supports spatial kinematic decoupling, which can decompose the six degrees of freedom of motion of X, Y, Z, RX, RY and RZ in the Cartesian coordinate system into the elongation of the six actuators in the LBCB six-degree-of-freedom loading control system.

[0019] Optionally, the LBCB six-degree-of-freedom loading control system realizes six-degree-of-freedom loading of structural components by coordinated motion of six actuators with mutually coupled spatial motions.

[0020] Optionally, the MTS controller supports no less than 6 channels of internal data output and no less than 12 channels of external data input.

[0021] Optionally, the LBCB six-degree-of-freedom loading control system supports no less than 6 channels of external command input and no less than 12 channels of internal data output.

[0022] The present invention also provides a six-degree-of-freedom hybrid test method based on OpenSees-OpenFresco-MTS-LBCB, comprising the following steps:

[0023] Step 1: Establish a control station containing no less than 6 actuators in the DOF module of the MTS 793 control software. In addition, set up no less than 6 internal data output channels and no less than 12 external data input channels. The data output signal sources of the internal data output channels are the displacement commands of the actuators, and the signal sources of the external data input channels are the displacement feedback and load feedback of the 6 actuators in the LBCB six-degree-of-freedom loading control system.

[0024] Step 2: Connect the internal data output channel in the MTS controller to the external command control channel of the actuator in the LBCB six-degree-of-freedom loading control system; connect the external data input channel in the MTS controller to the internal data output channel of the actuator in the LBCB six-degree-of-freedom loading control system;

[0025] Step 3: Calibrate and test the mapping relationship between the input channel and output channel in the MTS controller and the LBCB six-degree-of-freedom loading control system;

[0026] Step 4: Input the front and rear ball joint positions of the six actuators in the LBCB six-degree-of-freedom loading control system into the DOF module of the MTS793 control software;

[0027] Step 5: Build an engineering structure calculation model in OpenSees finite element software;

[0028] Step 6: In the OpenFresco hybrid test platform, the global coordinate system in the finite element and the global Cartesian coordinate system of the LBCB six-degree-of-freedom loading control system are transformed and defined, and various test control parameters are defined at the same time;

[0029] Step 7: Establish the six-degree-of-freedom mapping relationship and unit conversion relationship between the MTS 793 control software DOF module and the parameters defined in the OpenFresco hybrid test platform in the MTS CSI software.

[0030] Step 8: Calculate the corresponding engineering structure response according to the seismic action imposed on the engineering structure calculation model built in the OpenSees finite element software and the initialized engineering structure parameters, and obtain the response of the test unit;

[0031] Step 9: OpenSees finite element software transmits the test substructure response to the MTS 793 control software DOF module and MTS controller through the OpenFresco hybrid test platform and MTS CSI software;

[0032] Step 10: The DOF module of the MTS 793 control software decomposes the displacement motion in the overall Cartesian coordinate system of the LBCB six-degree-of-freedom loading control system into the elongation of the actuator, and outputs the displacement command of the actuator through the internal data output channel in the MTS controller to the external command control channel of the actuator in the LBCB six-degree-of-freedom loading control system. The actuator coordinates the motion to realize the spatial degree-of-freedom loading of the test unit and obtain the restoring force of the structure;

[0033] Step 11: The displacement feedback and load feedback of the actuator in the LBCB six-degree-of-freedom loading control system are output to the external data input channel of the MTS controller through the internal data output channel, and synthesized into the spatial position and load in the overall Cartesian coordinate system of the LBCB six-degree-of-freedom loading control system in the MTS 793 control software DOF module;

[0034] Step 12: The MTS controller sends the data of the six degrees of freedom of the test unit to the OpenSees finite element software through the MTS CSI software and the OpenFresco hybrid test platform;

[0035] Step 13: OpenSees finite element software calculates the test unit response at the next moment based on the received test unit working response signal and the seismic action applied by the program;

[0036] Step 14: Repeat steps 9 to 13 until the earthquake action ends.

[0037] The six-degree-of-freedom hybrid test system based on OpenSees-OpenFresco-MTS-LBCB of the present invention and the use method thereof have the following advantages: an organic combination of test and simulation calculation is achieved, and the system has a simple architecture, is economically feasible, has a clear data transmission path, is highly reliable, and expands the hybrid test capability of the LBCB system. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 is a schematic diagram of the system architecture of the present invention;

[0039] Figure 2It is a schematic diagram of the LBCB six-degree-of-freedom loading control system of the present invention;

[0040] Explanation of the reference numerals in the figure: OpenSees finite element software 10, OpenFresco hybrid test platform 20, MTS CSI software 30, MTS 793 control software DOF module 40, MTS controller 50, LBCB six-degree-of-freedom loading control system 60, LBCB controller 61, LBCB loading device 62. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] Unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one", "one" or "the" do not indicate a quantitative limitation, but indicate the existence of at least one. Words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0043] It should be noted that the terms "up", "down", "left", "right", "front", "back", etc. used in the present invention are only used to indicate relative position relationships. When the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0044] In order to better understand the purpose, architecture and function of the present invention, the following is an optional detailed description of a six-degree-of-freedom hybrid test system based on OpenSees-OpenFresco-MTS-LBCB and a method of using the system of the present invention in conjunction with the accompanying drawings.

[0045] like Figure 1As shown, the present invention provides a six-degree-of-freedom hybrid test system based on OpenSees-OpenFresco-MTS-LBCB, including OpenSees finite element software 10, OpenFresco hybrid test platform 20, MTS CSI software 30, MTS 793 control software DOF module 40, MTS controller 50, and LBCB six-degree-of-freedom loading control system 60.

[0046] The OpenSees finite element software 10 is used to build the engineering structure calculation model and analyze the data, and bidirectional data transmission is performed through the OpenFresco hybrid test platform 20 and the MTS CSI software 30 with the MTS 793 control software DOF module 40 and the MTS controller 50.

[0047] The OpenFresco hybrid test platform 20 is used to transform the overall coordinate system in the finite element and the overall Cartesian coordinate system of the control system and define various test control parameters.

[0048] MTS CSI software 30 is used to establish the degree of freedom mapping relationship and unit conversion corresponding to the parameters defined in the control software and interface software;

[0049] The MTS 793 control software DOF module 40 is used to decompose the displacement motion in the overall Cartesian coordinate system into the elongations of multiple actuators, and output the displacement command to the external command control channel of the actuator in the control system. It supports spatial kinematic decoupling and can decompose the motion of the six degrees of freedom X, Y, Z, RX, RY and RZ in the Cartesian coordinate system into the elongations of the six actuators in the LBCB six-degree-of-freedom loading control system 60;

[0050] The MTS controller 50 is used to connect the control software and the control system. It realizes bidirectional data interaction between the MTS controller 50 and the LBCB controller 61 through external data input and internal data output functions. It supports no less than 6 channels of internal data output and no less than 12 channels of external data input.

[0051] The LBCB six-degree-of-freedom loading control system 60 is used to simulate the response under a real earthquake and record and transmit the space and load in the overall Cartesian coordinate system. It includes two modules, the LBCB controller 61 and the LBCB loading device 62, and realizes the six-degree-of-freedom loading of the structural components through the coordinated movement of actuators with six spatial motions coupled to each other.

[0052] The present invention provides a method for using a six-degree-of-freedom hybrid test system based on OpenSees-OpenFresco-MTS-LBCB, comprising the following steps:

[0053] Step 1: Establish a control station including no less than 6 actuators in the MTS 793 control software DOF module 40, and set no less than 6 internal data output channels and no less than 12 external data input channels. The data output signal sources of the internal data output channels are respectively selected as the displacement commands of the actuators, and the signal sources of the external data input channels are respectively the displacement feedback and load feedback of the actuators in the LBCB six-degree-of-freedom loading control system 60;

[0054] Specifically, the actuators all select virtual valve control resources, and the actuators all adopt displacement control mode.

[0055] Step 2: Connect the internal data output channel in the MTS controller 50 to the external command control channel of the actuator in the LBCB six-degree-of-freedom loading control system 60; connect the external data input channel in the MTS controller 50 to the internal data output channel of the actuator in the LBCB six-degree-of-freedom loading control system 60;

[0056] Specifically, the 1#-6# internal data output channels in the MTS controller are connected to the external command control channels of the 1#-6# actuators in the LBCB six-degree-of-freedom loading control system, and the 1#-12# external data input channels in the MTS controller are connected to the 1#-12# internal data output channels of the six actuators in the LBCB six-degree-of-freedom loading control system.

[0057] Step 3: Calibrate and test the mapping relationship between the input channel and the output channel in the MTS controller 50 and the LBCB six-degree-of-freedom loading control system 60.

[0058] Step 4: Input the front and rear ball joint positions of the six actuators in the LBCB six-degree-of-freedom loading control system 60 into the MTS 793 control software DOF module 40;

[0059] Specifically, a coordinate transformation relationship between the global Cartesian coordinate system and the local coordinate system of the actuator in the LBCB six-degree-of-freedom loading control system 60 is established.

[0060] Step 5: Build an engineering structure calculation model in OpenSees finite element software 10;

[0061] Specifically, the computational model is configured to consist of two parts: a numerical substructure and an experimental substructure, i.e., an experimental unit.

[0062] Step 6: In the OpenFresco hybrid test platform 20, the global coordinate system in the finite element and the global Cartesian coordinate system of the LBCB six-degree-of-freedom loading control system 60 are transformed and defined, and various test control parameters are defined at the same time;

[0063] Specifically, the test control parameters can select NoTransformation, the test control can select MtsCsi, the test unit can select BeamColunmn, the test address can select LocalSite, etc.

[0064] Step 7: Establish the six-degree-of-freedom mapping relationship and unit conversion relationship corresponding to the parameters defined in the MTS 793 control software DOF module 40 and the OpenFresco hybrid test platform 20 in the MTS CSI software 30 .

[0065] Step 8: Calculate the corresponding engineering structure response according to the seismic action applied to the engineering structure calculation model built in the OpenSees finite element software 10 and the initialized engineering structure parameters, and obtain the response of the test unit;

[0066] Step 9: OpenSees finite element software 10 transmits the test substructure response to MTS 793 control software DOF module 40 and MTS controller 50 via OpenFresco hybrid test platform 20 and MTS CSI software 30;

[0067] Step 10: The MTS 793 control software DOF module 40 decomposes the displacement motion in the overall Cartesian coordinate system of the LBCB six-degree-of-freedom loading control system 60 into the elongation of the actuator, and outputs the displacement command of the actuator to the external command control channel of the actuator in the LBCB six-degree-of-freedom loading control system 60 through the internal data output channel in the MTS controller 50. The actuator coordinates the motion to realize the spatial degree-of-freedom loading of the test unit and obtain the restoring force of the structure;

[0068] Step 11: The displacement feedback and load feedback of the actuator in the LBCB six-degree-of-freedom loading control system 60 are output to the external data input channel of the MTS controller 50 through the internal data output channel, and are synthesized into the spatial position and load in the overall Cartesian coordinate system of the LBCB six-degree-of-freedom loading control system 60 in the MTS 793 control software DOF module 40;

[0069] Step 12: The MTS controller 50 sends the data of the six degrees of freedom of the test unit to the OpenSees finite element software 10 through the MTS CSI software 30 and the OpenFresco hybrid test platform 20;

[0070] Step 13: OpenSees finite element software 10 calculates the test unit response at the next moment according to the received test unit working response signal and the seismic action applied by the program;

[0071] Step 14: Repeat steps 9 to 13 until the earthquake action ends.

[0072] The six-degree-of-freedom hybrid test system based on OpenSees-OpenFresco-MTS-LBCB of the present invention and the use method thereof adopt the OpenSees-OpenFresco-MTS hybrid test architecture, combined with the LBCB six-degree-of-freedom loading control system, so as to realize the organic combination of test and simulation calculation. At the same time, the system architecture is simple, economically feasible, the data transmission path is clear, the reliability is strong, and the hybrid test capability of the LBCB system is expanded.

[0073] It is to be understood that the present invention is described by the above embodiments and should not be construed as limiting the embodiments of the present invention and the scope of the present invention. It is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

[0074] The following points need to be explained:

[0075] (1) The drawings of the embodiments of the present invention only relate to the structures related to the embodiments of the present invention, and other structures may refer to the general design.

[0076] (2) For the sake of clarity, in the drawings used to describe the embodiments of the present invention, the thickness of the layers or regions is exaggerated or reduced, that is, these drawings are not drawn according to the actual scale. It is understood that when an element such as a layer, film, region or substrate is referred to as being "on" or "under" another element, the element may be "directly" "on" or "under" the other element or there may be intermediate elements.

[0077] (3) In the absence of conflict, the embodiments of the present invention and the features therein may be combined with each other to obtain new embodiments.

[0078] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. The protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A six-degree-of-freedom hybrid test system based on OpenSees-OpenFresco-MTS-LBCB, It is characterized in that include: OpenSees finite element software, used to build engineering structure calculation models and analyze data; OpenFresco hybrid test platform, used to convert the global coordinate system in the finite element and the global Cartesian coordinate system of the control system and define various test control parameters; MTS CSI software is used to establish the degree of freedom mapping relationship corresponding to the parameters defined in the MTS 793 control software and the OpenFresco hybrid test platform and perform unit conversion; MTS 793 control software DOF module, used to decompose the displacement motion in the overall Cartesian coordinate system into the elongation of multiple actuators, and output the displacement command to the external command control channel of the actuator in the LBCB control system; MTS controller, used to connect LBCB control software and LBCB control system and exchange data with them; LBCB six-degree-of-freedom loading control system is used to simulate the response under real earthquakes and record and transmit the elongation and load of six actuators.

2. The six-degree-of-freedom hybrid test system based on OpenSees-OpenFresco-MTS-LBCB according to claim 1, Features: The LBCB six-degree-of-freedom loading control system comprises: LBCB controller, used to send displacement motion commands and record and transmit the actuator extension and load in the actuator local coordinate system; LBCB loading device, used to execute displacement motion commands.

3. The six-degree-of-freedom hybrid test system based on OpenSees-OpenFresco-MTS-LBCB according to claim 1, Features: The OpenSees finite element software performs bidirectional data transmission with the MTS 793 control software DOF module and the MTS controller via the OpenFresco hybrid test platform and the MTS CSI software.

4. The six-degree-of-freedom hybrid test system based on OpenSees-OpenFresco-MTS-LBCB according to claim 2, Features: The MTS controller and the LBCB six-degree-of-freedom loading control system realize two-way data interaction between the MTS controller and the LBCB controller through external data input and internal data output functions.

5. The six-degree-of-freedom hybrid test system based on OpenSees-OpenFresco-MTS-LBCB according to claim 1, Features: The MTS 793 control software DOF module supports spatial kinematic decoupling and can decompose the six degrees of freedom of motion (X, Y, Z, RX, RY and RZ) in the Cartesian coordinate system into the elongation of the six actuators in the LBCB six-degree-of-freedom loading control system.

6. The six-degree-of-freedom hybrid test system based on OpenSees-OpenFresco-MTS-LBCB according to claim 1, Features: The LBCB six-degree-of-freedom loading control system realizes six-degree-of-freedom loading of structural components by coordinated motion of six actuators with mutually coupled spatial motions.

7. The six-degree-of-freedom hybrid test system based on OpenSees-OpenFresco-MTS-LBCB according to claim 1, Features: The MTS controller supports no less than 6 channels of internal data output and no less than 12 channels of external data input.

8. The six-degree-of-freedom hybrid test system based on OpenSees-OpenFresco-MTS-LBCB according to claim 1, Features: The LBCB six-degree-of-freedom loading control system supports no less than 6 channels of external command input and no less than 12 channels of internal data output.

9. A six-degree-of-freedom hybrid test method based on OpenSees-OpenFresco-MTS-LBCB, It is characterized in that The steps include: Step 1: Establish a control station containing no less than 6 actuators in the DOF module of the MTS 793 control software. In addition, set up no less than 6 internal data output channels and no less than 12 external data input channels. The data output signal sources of the internal data output channels are the displacement commands of the actuators, and the signal sources of the external data input channels are the displacement feedback and load feedback of the 6 actuators in the LBCB six-degree-of-freedom loading control system. Step 2: Connect the internal data output channel in the MTS controller to the external command control channel of the actuator in the LBCB six-degree-of-freedom loading control system; connect the external data input channel in the MTS controller to the internal data output channel of the actuator in the LBCB six-degree-of-freedom loading control system; Step 3: Calibrate and test the mapping relationship between the input channel and output channel in the MTS controller and the LBCB six-degree-of-freedom loading control system; Step 4: Input the front and rear ball joint positions of the actuator in the LBCB six-degree-of-freedom loading control system into the MTS 793 control software DOF module; Step 5: Build an engineering structure calculation model in OpenSees finite element software; Step 6: In the OpenFresco hybrid test platform, the global coordinate system in the finite element and the global Cartesian coordinate system of the LBCB six-degree-of-freedom loading control system are transformed and defined, and various test control parameters are defined at the same time; Step 7: Establish the six-degree-of-freedom mapping relationship and unit conversion relationship between the MTS 793 control software DOF module and the parameters defined in the OpenFresco hybrid test platform in the MTS CSI software; Step 8: Calculate the corresponding engineering structure response according to the seismic action imposed on the engineering structure calculation model built in the OpenSees finite element software and the initialized engineering structure parameters, and obtain the response of the test unit; Step 9: OpenSees finite element software transmits the test substructure response to the MTS 793 control software DOF module and MTS controller through the OpenFresco hybrid test platform and MTS CSI software; Step 10: The DOF module of the MTS 793 control software decomposes the displacement motion in the overall Cartesian coordinate system of the LBCB six-degree-of-freedom loading control system into the elongation of the actuator, and outputs the displacement command of the actuator through the internal data output channel in the MTS controller to the external command control channel of the actuator in the LBCB six-degree-of-freedom loading control system. The actuator coordinates the motion to realize the spatial degree-of-freedom loading of the test unit and obtain the restoring force of the structure; Step 11: The displacement feedback and load feedback of the actuator in the LBCB six-degree-of-freedom loading control system are output to the external data input channel of the MTS controller through the internal data output channel, and synthesized into the spatial position and load in the overall Cartesian coordinate system of the LBCB six-degree-of-freedom loading control system in the MTS 793 control software DOF module; Step 12: The MTS controller sends the data of the six degrees of freedom of the test unit to the OpenSees finite element software through the MTS CSI software and the OpenFresco hybrid test platform; Step 13: OpenSees finite element software calculates the test unit response at the next moment based on the received test unit working response signal and the seismic action applied by the program; Step 14: Repeat steps 9 to 13 until the earthquake action ends.

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