CN109100211B - Control method of feedback control device for space lateral constraint loading of test component - Google Patents
Control method of feedback control device for space lateral constraint loading of test component Download PDFInfo
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- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
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- G05B11/36—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential
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Abstract
A feedback control device and a control method for space lateral constraint loading of a test component are disclosed, wherein the feedback control device comprises a loading device and a constraint device; the loading device is provided with a group and is arranged on one longitudinal side of the test component; each loading device is arranged corresponding to a node of the test component and is used for applying a load in a main loading direction to the node; the restraining device is provided with a group and is arranged on one transverse side of the test component for restraining the lateral displacement of the node; a first displacement measuring device is arranged on the opposite side of each constraint device; the first displacement measuring device is used for measuring actual lateral constraint displacement at a corresponding position on the test component; a group of second displacement measuring devices are arranged on the opposite side of each group of loading devices; the second displacement measuring device is used for measuring the actual main loading direction displacement of the corresponding node on the test component. The invention solves the technical problems that the boundary condition of the component constraint in the traditional test is difficult to accurately reproduce and the precision and the reliability of the test result are lower.
Description
Technical Field
The invention belongs to the field of experimental mechanics, and particularly relates to a deformation component feedback control method of a test member of a civil engineering structure under space lateral constraint loading.
Background
Building structures are usually large in size, so that the building structures are limited by economic and test environment constraints and are difficult to perform full-scale structural tests. The current commonly used test method generally selects key parts or parts with complex stress concentration in the structure for research. The mechanical property research of the structural member selected in the way inevitably needs to restore the real stress state of the boundary of the member, namely the boundary condition reappearance of the member. However, the method is limited by technical conditions, only sensitive degrees of freedom in the boundary degrees of freedom of the member are usually subjected to node constraint, but the conclusion obtained in the method is different from the true stress condition of the structure because the member moves along with the whole structure in the structure, the motion process and the mode are complicated and changeable, and the displacement and rotation angle change of the constrained degrees of freedom in the test is related to the whole motion of the structure.
Disclosure of Invention
The invention provides a control method of a feedback control device for testing spatial lateral constrained loading of a component, and aims to solve the technical problems that boundary conditions are difficult to reproduce accurately and the accuracy of test results is low in the traditional test method.
The invention adopts the following technical scheme.
A deformation component feedback control device for space lateral constraint loading comprises a loading device, a constraint device and a displacement measurement device; the loading devices are at least one group and are arranged on one longitudinal side of the test component; each group of loading devices is arranged in parallel along the vertical direction at intervals, and each loading device is arranged corresponding to the node position of the test component; the free end of the loading device is horizontally connected to the test component and used for applying a transverse load to the node; the restraining devices are arranged in a group and are arranged on one transverse side of the test component; the free end of the restraining device is horizontally connected to the test component and used for restraining the longitudinal displacement of the node; the displacement measuring devices are arranged in a group and are arranged on the opposite side of the constraint device to measure the longitudinal displacement of the test member.
Preferably, the test member is a reinforced concrete frame structural member or a steel structural member.
Preferably, the loading device and the restraining device are provided with reaction walls on the outer sides; the fixed end of the loading device is connected with the reaction wall, and the free end of the loading device is fixedly connected with the test component through a bolt; the fixed end of the restraint device is connected with the reaction wall, and the free end of the restraint device is fixedly connected with the test member through a bolt; a reaction frame is arranged on the outer side of the displacement measuring device, and the fixed end of the displacement measuring device is fixedly connected with the reaction frame; the free end of the displacement measuring device is hinged with the test member.
Preferably, the loading device, the restraining device and the displacement measuring device are all connected with a computer, and the computer receives the loading information of the loading device and the actual lateral restraining displacement acquired by the displacement measuring device
And (5) carrying out analysis and judgment.
A control method of a feedback control device for space lateral constraint loading of a test component comprises the following steps.
Step 1: a loading device, a restraining device, a first displacement measuring device and a second displacement measuring device are arranged.
And 2, step: recording the distance L from the fixed end to the hinged end of the first displacement measuring device1And recording the distance L from the fixed end of the second displacement measuring device to the hinged end2。
And 3, step 3: setting the expected displacement change at the lateral restraint of the test member, i.e. the target lateral restraint displacement during each step of loading
And 4, step 4: determining a control parameter K in a proportional-integral control algorithmpAnd KiSelecting a loading speed control parameter of the current loading device; wherein, KpIs a proportional parameter, KiIs an integration parameter.
And 5: loading the test component by using a loading device; meanwhile, the first displacement measuring device is utilized to acquire the actual lateral constraint displacement of each constraint point of the test component
Acquiring the actual main loading direction displacement of each constraint point of the test component by using a second displacement measuring device 
And 6: actual lateral restraint displacement at sensitive stress point of contrast test member
Actual main loading direction displacement
Constrained displacement laterally from the target
Analysing for errors present
And 7: when the temperature is higher than the set temperature
When the error is larger than the specified requirement, a displacement correction command is obtained
And correcting the displacement command
Feedback to loading deviceThe loading device receiving the displacement correction command
Then, correcting the loaded numerical value, and then continuing loading; wherein the content of the first and second substances,
and corresponding the m-th constraint point to the displacement correction command of the current loading in the ith step.
And 8: repeating the process from step 5 to step 7 until
And finishing the boundary correction when the error is less than the specified required error.
Preferably, the loading device in step 1 is arranged on one longitudinal side of the test member; the second displacement measuring device is arranged at the opposite side of the loading device; the restraint device is arranged on one lateral side of the test member; said first displacement measuring device being on opposite sides of said constraining means; the loading device, the first displacement measuring device and the second displacement measuring device of the constraint device are all arranged at the sensitive stress point of the test component; the sensitive stress point is a primary beam node and a secondary beam node or a beam column node.
Preferably, step 4, KpAnd KiThe determination is made using a step-by-step magnification test method.
Preferably, the loading information and the actual lateral constraint displacement in step 5
And actual main loading direction displacement
Synchronously outputting the data to a computer, and then analyzing and judging through the computer;
in step 7 when
When the error is larger than the specified requirement, proportional-integral control is adoptedThe algorithm for completing the displacement command adjustment of the restraint device specifically comprises the following steps: using a proportional-integral control algorithm preset by a computer program, and matching the formula
Calculating to obtain a displacement correction command
Where Δ t is the displacement meter sampling interval.
Preferably, step 7 is carried out
And when the error is smaller than the specified required error, finishing the boundary correction and stopping the operation.
Compared with the prior art, the invention has the following characteristics and beneficial effects.
1. The method of the invention controls and loads the constrained freedom of the test member, carries out error monitoring by arranging a displacement measuring device at the opposite side of the constrained device, adopts a feedback control method, and adjusts the loading device by an algorithm to carry out loading, thereby ensuring the high-precision simulation of the constrained freedom to the real boundary condition.
2. The control method of the invention arranges a displacement measuring device at a sensitive stress point of a test component to monitor the displacement change of the constraint direction of the test component, compares the sampling result of an external displacement measuring device with the expected displacement, analyzes the error of the displacement, uses a program preset control algorithm to complete the command adjustment of a lateral constraint device, the displacement measuring device and a loading device, corrects boundary conditions and achieves the accurate simulation effect of the constraint boundary of the component; the problem that boundary conditions are difficult to reproduce accurately in a traditional test is solved, and the reliability of test results is improved.
3. The control method is suitable for loading control of space lateral constraint of the structure in civil engineering tests, can carry out high-precision displacement control on lateral constraint nodes, corrects the lateral displacement of a test member in time, and ensures that the test finishes simulation of boundary conditions and application of loads according to a preset purpose.
Drawings
Fig. 1 is a front view of a deformation component feedback control apparatus of the present invention.
Fig. 2 is a plan view of the deformation component feedback control device of the present invention.
Fig. 3 is a side view of the deformation component feedback control apparatus of the present invention.
Reference numerals are as follows: 1-a loading device, 2-a restraining device, 3-a first displacement measuring device, 4-a test component, 4.1-an upright post, 4.2-a frame beam, 5-a second displacement measuring device, 6-a reaction wall, 7-a first reaction frame and 8-a second reaction frame.
Detailed Description
As shown in FIGS. 1-3, the feedback control device for the spatial lateral constrained loading of the test member comprises a loading device 1 and a constraint device 2; the loading devices 1 are provided with a group and are arranged on one longitudinal side of the test component 4; each group of loading devices 1 is arranged in parallel along the vertical direction at intervals, and each loading device 1 is arranged corresponding to a node of the test component 4; the free end of the loading device 1 is horizontally connected to the test component 4 and is used for applying a load in a main loading direction to the node; the restraining devices 2 are arranged in a group and are arranged on one lateral side of the test component 4; the free end of the restraint device 2 is horizontally connected to the test component 4 and used for restraining the lateral displacement of the node; a first displacement measuring device 3 is arranged on the test member 4 and on the opposite side of each constraint device 2; the first displacement measuring device 3 is used for measuring the actual lateral constrained displacement at the corresponding position on the test component 4 
A group of second displacement measuring devices 5 are arranged on the test component 4 and positioned on the opposite side of each group of loading devices 1 at intervals in parallel along the transverse direction; the second displacement measuring device 5 is used for measuring the actual main loading direction displacement of the corresponding node on the test component 4
In this embodiment, the test member 4 is a reinforced concrete frame structural member or a steel structural member.
In this embodiment, a reaction wall 6 is provided outside the loading device 1 and the restraining device 2; the fixed end of the loading device 1 is connected with the reaction wall 6, and the free end of the loading device 1 is fixedly connected with the test component 4 through a bolt; the fixed end of the restraint device 2 is connected with the reaction wall 6, and the free end of the restraint device 2 is fixedly connected with the test component 4 through a bolt; a first reaction frame 7 is arranged outside the first displacement measuring device 3; the fixed end of the first displacement measuring device 3 is fixedly connected with the first reaction frame 7, and the free end of the first displacement measuring device 3 is hinged with the test component 4; a second reaction frame 8 is arranged outside the second displacement measuring device 5; the fixed end of the second displacement measuring device 5 is fixedly connected with the second reaction frame 8, and the free end of the second displacement measuring device 5 is hinged with the test component 4.
In this embodiment, the loading device 1, the constraint device 2, the first displacement measuring device 3 and the second displacement measuring device 5 are all connected to a computer; the computer receives the loading information of the loading device 1 and the actual lateral constraint displacement acquired by the first displacement measuring device 3
And the actual main loading direction displacement collected by the second displacement measuring device 5
And (5) carrying out analysis and judgment.
The control method of the feedback control device for the space lateral constraint loading of the test component comprises the following steps.
Step 1: the loading device 1, the restraining device 2, the first displacement measuring device 3 and the second displacement measuring device 5 are arranged.
Step 2: recording the distance L from the fixed end to the hinged end of the first displacement measuring device 31And recording the distance L from the fixed end to the hinged end of the second displacement measuring device 52。
And step 3: setting the expected change in displacement at the lateral restraint of the test member 4, i.e. the target lateral restraint position during each loading stepMoving device
And 4, step 4: determining a control parameter K in a proportional-integral control algorithmpAnd KiAnd selecting a loading speed control parameter of the current loading device 1; wherein, KpIs a proportional parameter, KiIs an integration parameter.
And 5: loading the test component 4 by using the loading device 1; meanwhile, the first displacement measuring device 3 is used for acquiring the actual lateral constraint displacement of each constraint point of the test component 4 
The second displacement measuring device 5 is used for acquiring the actual main loading direction displacement of each constraint point of the test component 4
And 6: actual lateral restraint displacement at sensitive stress point of comparative test member 4
Actual main loading direction displacement
Constrained displacement laterally from the target
Analysing for errors present
And (4) the actual deviation of the lateral displacement of the mth constraint point corresponding to the current loading of the ith step.
And 7: when the temperature is higher than the set temperature
Greater than specifiedDeriving a command for correcting the displacement when the error is requested
And correcting the displacement command
Feeding back to the loading device 1, the loading device 1 receiving the displacement correction command
Then, correcting the loaded numerical value, and then continuing loading; wherein, the first and the second end of the pipe are connected with each other,
and corresponding the m-th constraint point to the displacement correction command of the current loading in the ith step.
And 8: repeating the process from step 5 to step 7 until
And finishing the boundary correction when the error is less than the specified required error.
In the embodiment, the loading device 1 in the step 1 is arranged at one longitudinal side of the test component 4; the second displacement measuring device 5 is arranged on the opposite side of the loading device 1; the restraining device 2 is arranged on one lateral side of the test member 4; said first displacement measuring means 3 constraining the opposite side of the device 2; wherein, the loading device 1, the first displacement measuring device 3 and the second displacement measuring device 5 of the restraint device 2 are all arranged at the sensitive stress point of the test component 4; the sensitive stress point is a primary beam node and a secondary beam node or a beam column node.
In this example, K in step 4pAnd KiThe determination is made using a step-by-step magnification test method.
In this embodiment, the information loading and actual lateral constraint displacement in step 5
And actual main loading direction displacement
Synchronously outputting the data to a computer, and then analyzing and judging through the computer;
in step 7 when
When the error is larger than the specified requirement, the proportional-integral control algorithm is adopted to complete the displacement command adjustment of the restraint device 2, and the method specifically comprises the following steps: using proportional-integral control algorithm preset by computer program, fitting formula
Calculating to obtain a displacement correction command
Where Δ t is the displacement meter sampling interval.
In this embodiment, step 7 is
And when the error is smaller than the specified required error, finishing the boundary correction and stopping the operation.
The embodiments described in this specification are merely illustrative of implementations of the inventive concept and the scope of the present invention should not be considered limited to the specific forms set forth in the embodiments but encompasses equivalent technical means as would be appreciated by those skilled in the art based on the inventive concept.
Claims (8)
1. A control method of a feedback control device for testing component space lateral constraint loading is characterized in that the feedback control device for testing component space lateral constraint loading comprises a loading device (1) and a constraint device (2); the loading devices (1) are provided with a group and are arranged on one longitudinal side of the test component (4); each group of loading devices (1) is arranged in parallel along the vertical direction at intervals, and each loading device (1) is arranged corresponding to a node of the test component (4); the free end of the loading device (1) is horizontally connected to the test component (4) and is used for applying force to the node Load in the primary loading direction; the restraint devices (2) are provided with a group and are arranged on one lateral side of the test component (4); the free end of the restraining device (2) is horizontally connected to the test component (4) and used for restraining the lateral displacement of the node; first displacement measuring devices (3) are arranged on the test component (4) and located on the opposite side of each constraint device (2); the first displacement measuring device (3) is used for measuring the actual lateral constraint displacement at the corresponding position on the test component (4)
A group of second displacement measuring devices (5) are arranged on the test component (4) and are positioned on the opposite side of each group of loading devices (1) at intervals in parallel along the transverse direction; the second displacement measuring device (5) is used for measuring the actual main loading direction displacement of the corresponding node on the test component (4)
The control method comprises the following steps:
step 1: arranging a loading device (1), a restraining device (2), a first displacement measuring device (3) and a second displacement measuring device (5);
and 2, step: recording the distance L from the fixed end to the hinged end of the first displacement measuring device (3)1And recording the distance L from the fixed end to the hinged end of the second displacement measuring device (5)2；
And step 3: setting the expected displacement change at the lateral restraint of the test member (4), i.e. the target lateral restraint displacement during each step of loading 
And 4, step 4: determining a control parameter K in a proportional-integral control algorithmpAnd KiAnd selecting a loading speed control parameter of the current loading device (1); wherein, KpIs a proportional parameter, KiIs an integral parameter;
and 5: loading the test component (4) by using the loading device (1); while using a first displacement measurementThe measuring device (3) acquires the actual lateral constraint displacement of each constraint point of the test component (4)
The second displacement measuring device (5) is used for acquiring the actual main loading direction displacement of each constraint point of the test component (4)
Step 6: comparing the actual lateral restraint displacement at the sensitive stress point of the test member (4)
Actual main loading direction displacement
Constrained displacement from the target side
Analysing for errors present
The actual deviation of the lateral displacement of the mth constraint point corresponding to the loading of the ith step;
and 7: when in use
When the error is larger than the specified requirement, a displacement correction command is obtained
And correcting the displacement command
Feeding back to the loading device (1) for loadingThe device (1) being arranged to receive a displacement correction command
Then, correcting the loaded numerical value, and then continuing loading; wherein the content of the first and second substances,
corresponding the displacement correction command when the ith constraint point is loaded at present to the mth constraint point;
and 8: repeating the process from step 5 to step 7 until 
And finishing the boundary correction when the error is smaller than the specified required error.
2. The control method of the feedback control device for the space lateral constraint loading of the test component as claimed in claim 1, characterized in that: the test component (4) is a reinforced concrete frame structural component or a steel structural component.
3. The control method of the feedback control device for the space lateral constraint loading of the test component as claimed in claim 1, characterized in that: reaction walls (6) are arranged on the outer sides of the loading device (1) and the constraint device (2); the fixed end of the loading device (1) is connected with the reaction wall (6), and the free end of the loading device (1) is fixedly connected with the test component (4) through a bolt; the fixed end of the restraint device (2) is connected with the reaction wall (6), and the free end of the restraint device (2) is fixedly connected with the test component (4) through a bolt; a first reaction frame (7) is arranged on the outer side of the first displacement measuring device (3); the fixed end of the first displacement measuring device (3) is fixedly connected with the first reaction frame (7), and the free end of the first displacement measuring device (3) is hinged with the test component (4); a second reaction frame (8) is arranged on the outer side of the second displacement measuring device (5); the fixed end of the second displacement measuring device (5) is fixedly connected with the second reaction frame (8), and the free end of the second displacement measuring device (5) is hinged with the test component (4).
4. The control method of the feedback control device for the space lateral constraint loading of the test component as claimed in claim 1, characterized in that: the loading device (1), the restraining device (2), the first displacement measuring device (3) and the second displacement measuring device (5) are all connected with a computer; the computer receives the loading information of the loading device (1) and the actual lateral constraint displacement acquired by the first displacement measuring device (3)
And the actual main loading direction displacement collected by the second displacement measuring device (5)
And (5) carrying out analysis and judgment.
5. The control method of the feedback control device for the space lateral constraint loading of the test member according to claim 1, characterized in that: the loading device (1) is arranged on one longitudinal side of the test component (4) in the step 1; the second displacement measuring device (5) is arranged on the opposite side of the loading device (1); the restraint device (2) is arranged on one lateral side of the test member (4); the first displacement measuring device (3) constrains the opposite side of the device (2); the loading device (1), the restraint device (2), the first displacement measuring device (3) and the second displacement measuring device (5) are all arranged at sensitive stress points of the test member (4); the sensitive stress point is a primary beam node and a secondary beam node or a beam column node.
6. The control method of the feedback control device for the space lateral constraint loading of the test member according to claim 1, characterized in that: step 4KpAnd KiThe determination is made using a step-by-step magnification test method.
7. The control method of the feedback control device for the space lateral constraint loading of the test member according to claim 6, characterized in that: loading information and actual lateral constraint displacement in step 5
And actual main loading direction displacement
Synchronously outputting the data to a computer, and analyzing and judging the data by the computer;
in step 7 when
When the error is larger than the specified requirement, the displacement command adjustment of the constraint device (2) is completed by adopting a proportional-integral control algorithm, which specifically comprises the following steps: using a proportional-integral control algorithm preset by a computer program, and matching the formula
Calculating to obtain a displacement correction command
Where Δ t is the displacement meter sampling interval.
8. The method for controlling the feedback control device for the spatially constrained lateral loading of the test member as recited in claim 1, wherein the step 7 is performed
And when the error is smaller than the specified required error, finishing the boundary correction and stopping the operation.
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