A method for arranging circuits for human body vibration testing sensors based on digital twins

Abstract

This invention discloses a method for arranging the circuit of a human body vibration test sensor based on digital twins, comprising: creating a virtual test scenario, importing a multi-degree-of-freedom vibration platform, a seat, a seated human body, and sensor models, defining each component according to actual working conditions, and determining the position of each object and their contact conditions; after the virtual scenario is created, the system inputs an excitation signal to perform dynamic simulation and generate sensor force data under dynamic conditions; defining virtual test scenario script parameters according to the goal of minimizing the influence of sensor signal lines on the mechanical properties of the sensor body and the circuit layout requirements, and running the system to generate the optimal arrangement of sensor signal lines in the virtual environment; referring to the optimal arrangement of sensor signal lines in the virtual environment, performing actual circuit layout, and finally verifying the circuit layout by acquiring the wire number tube values ​​at both ends of the sensor signal lines using a camera.

Description

Technical Field

[0001] This invention relates to the field of computer collaborative simulation technology, and in particular to a method for arranging sensor circuits in a human factors engineering environment. Background Technology

[0002] Vehicles, ships, and manned aircraft generate vibrations in the passenger environment during use, which can affect the physical and mental health of occupants. Sensors can effectively analyze the human body's vibration response characteristics by collecting physical quantities such as human acceleration, displacement, and force in a vibrating environment. Therefore, they are widely used in human factors engineering research on human vibration and human-computer interaction simulation.

[0003] Currently, in human vibration testing, operators often use adhesive methods to fix sensors to the surface of objects such as the human body, seats, and vibration tables. However, the dynamic forces acting on the sensor signal lines during the test have a significant negative impact on the sensor fixation, causing the signal lines to peel off and the sensor body to be tilted, affecting the acquisition of test data. To limit the impact of the sensor signal lines on the sensor body, operators often use a segmented adhesive method to fix the signal lines, but the forced movement of the human body caused by vibration is more likely to damage the stability of the sensor fixation. In addition, the requirements and specifications for wiring layout in human vibration testing still need to be improved. When a large number of sensors are used, the sensor signal lines are prone to tangling, and the effective fixation of sensors urgently needs to be solved.

[0004] In summary, the problem of effectively fixing sensors in human factors engineering environments can be further refined into the arrangement and mechanical issues of sensor signal lines. Summary of the Invention

[0005] This invention provides a method for arranging the circuit of a human body vibration test sensor based on a digital twin. The method constructs a digital twin based on a human body vibration test and combines dynamic mechanical simulation and circuit optimization to solve the problem of effective sensor fixation.

[0006] In a first aspect, the present invention provides a method for arranging circuits for human body vibration testing sensors based on digital twins, mainly comprising:

[0007] S1: Create a virtual test scenario, import multi-degree-of-freedom vibration platform, seat, seated human body and sensor model, define each component according to the actual working conditions, and determine the position of each object and the contact between them.

[0008] S2: Once the virtual scene is created, the system inputs excitation signals to perform dynamic simulation and generate sensor force data under dynamic conditions;

[0009] S3: Define the script parameters for the virtual test scenario based on the goal of minimizing the impact of sensor signal lines on the mechanical properties of the sensor body and the requirements for line layout specifications. Run the system to generate the optimal layout of sensor signal lines in the virtual environment.

[0010] S4: Refer to the optimal arrangement of sensor signal lines in the virtual environment to arrange the actual circuit. Finally, use the camera to collect the wire number values ​​at both ends of the sensor signal lines to verify the circuit arrangement.

[0011] Optionally, before step S1, the following steps may be included: running the vibration table at maximum test vibration amplitude to determine the safe distance of the vibration platform, and then proceeding to steps S1-S4 based on the safe distance.

[0012] Optionally, before step S1, the process may include: running the vibration table under multiple vibration conditions to determine if there are any abnormalities in the vibration table, and proceeding to steps S1-S4 after confirming that there are no abnormalities. If abnormal noise or vibration occurs during the operation of the vibration table, the test equipment is paused, and each piece of equipment is re-inspected, with a focus on checking the seat fixation.

[0013] Secondly, embodiments of the present invention also provide a simulation method for a human factors engineering test environment, comprising:

[0014] A digital twin of the human body vibration test was constructed, mainly including a multi-degree-of-freedom vibration platform model, a seated human body model, a seat model, and a sensor model. All models are rigid body components, subject to gravity. The position, rotation, and scaling information of the multi-degree-of-freedom vibration platform model, seat model, and seated human body model are determined by a transformation component. The multi-degree-of-freedom vibration platform model, seat model, and seated human body model have a parent-child hierarchical relationship. The seated human body model and seat model are fixed to the surface of the multi-degree-of-freedom vibration platform model and are influenced by it, maintaining natural contact with the seat model. The specific position of the sensor model is determined by the transformation component. The sensor model's position is fixed on the human body surface, seat surface, and vibration table surface according to actual test requirements, with the tilt angle of the sensor's actual placement being an adjustment parameter. The virtual construction platform uses Unity software, while the multi-degree-of-freedom vibration platform model, seated human body model, seat model, and sensor model are constructed using Solidworks software.

[0015] The excitation signal required for the dynamic simulation of the human body vibration test model is a white noise excitation signal with an amplitude of 1.0 ms. − 2The RMS excitation duration is 60 seconds. The metal material properties of the multi-degree-of-freedom vibration platform model, the rigid seat model, and the block-shaped triaxial accelerometer model are defined. The silicone elastic material properties of the seated human body model (with hands resting on the knees) and the disc-shaped SIT-pad triaxial accelerometer are also defined. The system collects force data from the sensors at the center of the seat cushion and backrest, the center of the multi-degree-of-freedom vibration platform, and the lumbar spine. The dynamic simulation software is Ansys, and the model meshing software is Hypermesh.

[0016] A topology optimization algorithm was used to simulate sensor circuit planning. The objective was to minimize the impact of sensor signal lines on the mechanical properties of the sensor itself. Constraints included the number of sensors (first constraint) and the length of a single sensor signal line (from the sensor interface to the edge of the multi-degree-of-freedom vibration platform) (second constraint). A virtual scene circuit layout program was set in accordance with the ISO 10326-1 standard. In the virtual environment, the circuit layout script parameters ensured right angles at corners and a 2cm allowance at each corner. In the human vibration test, disc-shaped SIT-pad sensors and block sensors were mainly used. The disc-shaped SIT-pad triaxial accelerometer was primarily used to detect vibration signals from the seat cushion and backrest. The virtual planning of its signal line, while meeting the above script requirements, also included a program to avoid the seat cushion and backrest pivot areas. When the block sensor was placed at the spine, a program to avoid the human-chair contact area was included. All virtual circuits were planned according to the contour curves of the seat and the human body.

[0017] Thirdly, embodiments of the present invention also provide a line fixing device, comprising:

[0018] The actual sensor arrangement is based on the virtual environment sensor signal line arrangement. In actual wiring, right angles are difficult to achieve at corners, and the lines are prone to bending. Therefore, a segmented fixing device is designed to fix the sensor signal lines. The device consists of a cable groove and a fixing body. The cable groove restricts the movement of the signal lines, and the fixing body secures the cable groove to the surface of the seat or vibration table. The diameter of the cable groove is slightly larger than the width of the signal line, and its uppermost part is open to accommodate the signal line. The fixing body has a T-shaped groove and a T-shaped protrusion on its side for connection. The cable groove can be adjusted according to the number of signal lines, meeting the requirements for fixing different numbers of signal lines at different locations under vibration conditions.

[0019] Fourthly, embodiments of the present invention also provide a line number detection method, comprising:

[0020] After completing the actual circuit connection based on the virtual scene, the wire numbers at both ends of each sensor signal line are acquired by the camera on the test bench (the wire number tubes are pre-fixed at both ends of the sensor signal lines). The digital images at the wire numbers at both ends of each signal line are sent to computer software for numerical extraction. The Hough transform is used to correct the tilt of the wire number images. The extracted values ​​are sent to the virtual simulation software for parameter definition. It is required that the values ​​at both ends of each signal line are consistent and that the wire number corresponds to the value at the data acquisition system. If the values ​​at both ends of the wire number are inconsistent or the wire number does not correspond to the value at the port of the data acquisition system, the arrangement is incorrect. The virtual scene will issue a warning for the incorrect line, and the test operator will readjust the line again.

[0021] Fifthly, embodiments of the present invention also provide an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the steps of any of the above-described methods for arranging circuits of a human body vibration test sensor based on digital twins.

[0022] In a sixth aspect, embodiments of the present invention also provide a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of any of the above-described methods for arranging circuits of a human body vibration test sensor based on digital twins.

[0023] The method for arranging human body vibration test sensor circuits based on digital twins provided in this invention improves the fixation reliability of sensors in human factors engineering test environments by utilizing virtual reality and dynamic mechanical simulation technology. Attached Figure Description

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 A simplified design concept diagram provided for embodiments of this application;

[0026] Figure 2 A diagram illustrating the problem object of the vibration sensor provided in the embodiments of this application;

[0027] Figure 3 A virtual circuit diagram of the SIT-pad three-axis accelerometer sensor at the seat provided in this embodiment of the application;

[0028] Figure 4 This is a virtual circuit diagram of a triaxial accelerometer sensor at the human spine provided in an embodiment of this application.

[0029] Figure 5 This is a virtual circuit layout diagram at the vibration table surface provided in the embodiments of this application;

[0030] Figure 6 This is a schematic diagram of the sensor structure provided in an embodiment of this application;

[0031] Figure 7 A schematic diagram of the line fixing device provided in the embodiments of this application; Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the embodiments of this application.

[0033] To address the problems of existing technologies, this application provides a method for arranging the circuit of a human body vibration testing sensor based on digital twins. The method for arranging the circuit of a human body vibration testing sensor based on digital twins, as provided in this application, will be described below.

[0034] The application scenario of the sensor circuit layout and detection method provided in this application embodiment is in human body vibration test, where the sensor body is fixed to the surface of the human body and the test equipment, while the sensor signal line is not restricted. The free swing of the sensor signal will affect the fixation of the sensor body, and thus affect the data acquisition. This embodiment designs a virtual and real interactive layout method of sensor circuit based on the force characteristics and motion characteristics of the sensor under dynamic environment.

[0035] Specifically Figure 1 A simplified design concept diagram provided for embodiments of this application, such as... Figure 1 As shown, the arrangement of sensor signal lines in a virtual system is generated from a virtual scene. The actual arrangement of sensor signal lines in the system is referenced from the virtual arrangement, thereby generating a practical and reliable arrangement of sensor signal lines that can be applied to human vibration tests.

[0036] Specifically Figure 2 A diagram illustrating the problem object of the vibration sensor provided in the embodiments of this application, such as... Figure 2 As shown, the sensor is subjected to a force from its signal line, causing its original fixed state to change, such as... Figure 2 As shown in Figure a, when the sensor tilts, its original pointing direction changes, meaning the multi-axis vibration signal measured by the sensor no longer represents the direction required by the test; for example... Figure 2As shown in b, the sensor is stripped off due to the force of the signal line, and the data measured by the sensor becomes invalid.

[0037] For example, the block sensor used in this experiment was the PCB356A16 triaxial accelerometer.

[0038] Specifically Figure 3 A virtual layout diagram of the SIT-pad signal line at the seat provided in the embodiments of this application is shown below. Figure 3 As shown, the SIT-pad is fixed to the seat cushion and backrest with tape, and the seat is fixed to the vibration table with bolts. The virtual system generates a virtual test scenario based on the actual fixation. The seat model is rigidly fixed to the upper surface of the vibration table model with reference to the actual rigidity, and the SIT-pad model is rigidly fixed to the seat surface with reference to the actual rigidity.

[0039] The virtual test scenario is imported into simulation software, and boundary conditions are defined. A topology optimization algorithm is used to optimize the mechanical and kinematic properties of the sensors, determine the optimal route layout, and input the optimal route parameters into the virtual vibration scenario. The script information is then defined to make the optimal route visible.

[0040] like Figure 3 As shown, the SIT-pad wiring on the seat surface is represented by red dashed lines, with arrows at the top indicating the wiring direction. As shown in the figure, the SIT-pad signal lines at the backrest begin naturally along the +Z direction and extend along the -Y direction 2cm from the bottom of the backrest. The wiring fixing device provided in this embodiment ensures a 90° bend, and the lines extend along the -Z direction when passing the edge of the backrest. At the seat cushion, the SIT-pad signal lines begin along the -X direction and extend along the -Y direction 2cm from the edge of the seat cushion. The wiring fixing device provided in this embodiment ensures a 90° bend, and the lines extend along both the -Z and -X directions when passing the edge of the seat cushion to achieve a full fit with the seat contour. The reference coordinate system is consistent with the vibration table coordinate system.

[0041] For example, Unity software is used to build virtual test scenarios, Solidworks software is used to build test equipment models, Ansys software is used for simulation software, and Hypermesh software is used for mesh generation.

[0042] For example, the disk-shaped sensor (SIT-pad) used in this experiment is a PCB356B41 triaxial accelerometer, and the vibration table is a LIM-TEC six-degree-of-freedom vibration platform.

[0043] Specifically Figure 4 This is a virtual layout diagram of the triaxial accelerometer signal lines at the human spine provided in an embodiment of this application, such as... Figure 4As shown, the human body is seated in a relaxed state, with the back of the human body in contact with the seat back, and the sensor is fixed to the end of the human spine. The wiring arrangement is as follows: the sensor signal line starts naturally and hangs down to the seat cushion, and is arranged along the -Y direction. When passing the edge of the seat base, it is arranged along the -X and -Z directions to fully conform to the seat contour. The wiring is at 90° at all corners, which is achieved by the wiring fixing device provided in this embodiment of the invention.

[0044] For example, the sensor can be fixed to areas such as the head, waist, and buttocks of the human body, and the arrangement of the sensor signal lines will also change accordingly.

[0045] Specifically Figure 5 This is a virtual arrangement diagram of the sensor signal lines at the vibration table surface provided in the embodiments of this application. Figure 5 As shown, the main test scenario is constructed by sequentially contacting the human body, seat, and vibration table. The seat is rigidly fixed to the upper surface of the vibration table, and the human body sits naturally on the seat surface. The top view shows the planar arrangement of the vibration table and seat. The seat plane is located at the center of the vibration table. The sensor signal lines on the human body and seat surface are arranged along the -Y direction after passing through the seat plane. All sensor signal lines are fixed side-by-side by wiring fixing devices. The number of rows of wiring fixing devices is determined by the number of sensor signals. To ensure the wiring is arranged in a straight line, a set of wiring fixing devices is added every 50cm, and another set is added near the edge of the vibration table.

[0046] Specifically Figure 6 This is a schematic diagram of the sensor structure provided in the embodiments of this application, such as... Figure 7 The sensor structure shown includes: a sensor body, a sensor base, and a signal cable. The sensor body collects vibration signals, the sensor base facilitates fixing the sensor to the surface of the test object, and the signal cable transmits the vibration signals to the data acquisition system. To facilitate the system's verification of connection correctness, the sensor signal cable has wire number tubes at both ends. If the wire number values ​​at both ends of the sensor signal cable are consistent, the connection is correct; if the values ​​at both ends are inconsistent, the connection is incorrect, and the test operator needs to readjust it.

[0047] For example, the sensor signal line should be PCB034G20.

[0048] For example, PVC material is used for wire gauge tubes.

[0049] Specifically Figure 7 This is a schematic diagram of a line fixing device provided in an embodiment of this application. The device consists of a wire groove and a fixing body. The wire groove is used to restrict the movement of the signal line, and the fixing body is used to fix the device to the surface of the test equipment. The device is used to realize 90° turns of the signal line and straight line arrangement. At the same time, the number of rows can be adjusted according to the number of signal lines and the fixing scenario to meet different fixing requirements.

[0050] For example, the wiring fixing device is made of PVC material, and the diameter of the wire trough is 2mm.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for arranging circuits for human body vibration testing sensors based on digital twins, characterized in that, include: S1: Create a virtual test scenario and import a multi-degree-of-freedom vibration platform, a seat, a seated human body, and sensor models. The sensor models include a disc-shaped triaxial accelerometer SIT-pad fixed to the center of the rigid seat cushion and backrest, and a block-shaped triaxial accelerometer fixed to the lumbar spine of the human body and the center of the multi-degree-of-freedom vibration platform model. Define the position, constraint boundaries, and mutual contact of each component according to the actual working conditions. S2: Set the dynamic simulation excitation signal, which is a white noise signal with an amplitude of 1.0 ms. -2 The excitation duration is 60s. The system performs dynamic simulation analysis and obtains dynamic force data of each sensor by combining the material properties of the sensor model. S3: Based on the topology optimization algorithm, with the goal of minimizing the influence of sensor signal lines on the mechanical properties of the sensor body, and in conjunction with the ISO10326-1 standard, the number of sensors and the length of sensor signal lines are set as constraints, and the running system generates the optimal arrangement of sensor signal lines in a virtual environment. S4: The actual sensor circuit is arranged according to the generated optimal arrangement path. The sensor signal lines are arranged using a wire groove device with a "T" cross-section structure. The bottom of the wire groove is fixed to the surface of the multi-degree-of-freedom vibration platform and the rigid seat. S5: Verify the correctness of the circuit layout by collecting the wire number values ​​at both ends of the sensor signal line using the camera.

2. The method for arranging the circuit of a human body vibration testing sensor based on digital twin according to claim 1, characterized in that: Images of the wire numbers at both ends of each sensor signal line are captured by a camera. The images are then subjected to Hough transform for tilt correction before numerical information is extracted. The wire numbers are then compared with the correspondence of the data acquisition system to determine whether the line layout is correct.

3. An electronic device, characterized in that, It includes a processor, a memory, and a program or instructions stored in the memory and executable on the processor, wherein the program or instructions, when executed by the processor, implement the circuit layout method for human body vibration testing sensors based on digital twins as described in any one of claims 1-2.

4. A readable storage medium, characterized in that, The readable storage medium stores a program or instructions that, when executed by a processor, implement the circuit layout method for human body vibration testing sensors based on digital twins as described in any one of claims 1-2.

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