Multi-shaft neck force sensor calibration device and method for automobile crash dummy

Abstract

The invention discloses a multi-shaft neck force sensor calibration device and method for an automobile crash dummy, and is used for solving the problems that an existing calibration device is tedious in clamping, inaccurate in centering and inconvenient in direction conversion. The device comprises a ball platform, a force measuring system, a clamp system and a loading control system. The ball platform provides a horizontal degree of freedom to realize automatic centering; the clamp system realizes the conversion of the calibration direction of the neck force sensor to be calibrated through the angle adjusting platform; the force measuring system monitors the load in real time through a standard force sensor; and the loading control system applies a standard load and acquires data. The calibration method implemented through the calibration device comprises the steps of sensor installation, precise centering, calibration execution, load application, synchronous data acquisition and the like. According to the invention, convenient and accurate calibration of multiple axial forces and bending moments is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the calibration technology of multi-axis neck force sensor for automotive crash dummy, and in particular to a calibration device and method of multi-axis neck force sensor for automotive crash dummy. BACKGROUND

[0002] In automotive crash tests, biomechanical human body models (hereinafter referred to as "dummies") are essential key equipment for conducting crash tests and impact tests to evaluate the performance of safety systems. The dummies have integrated multiple types of sensors in each part of the body to accurately measure various biomechanical responses, such as acceleration, displacement, force, and moment, etc. that the simulated human body bears during the test. Among them, the neck, as a key part connecting the head and the torso, bears the force and moment that are the most important biomechanical indicators for evaluating the risk of neck injury. These data rely on the multi-axis neck force sensor installed on the dummy's neck to accurately measure. The measurement accuracy of the multi-axis neck force sensor directly determines the reliability and effectiveness of the crash test data, and thus affects the objective evaluation of vehicle safety performance. Therefore, regular high-precision calibration of the multi-axis neck force sensor is a necessary condition to ensure its long-term stability and data accuracy.

[0003] The existing force sensor calibration device mainly has the following ways and deficiencies: poor installation and adaptability of the calibration device, limited size and shape of the sensor, difficult installation centering, which makes it difficult to coincide the axis, affecting the accuracy and efficiency of calibration, and may introduce additional errors. In addition, traditional calibration methods are usually tedious and inefficient, and it is difficult to achieve high-precision calibration.

[0004] Therefore, there is an urgent need in the art for a calibration device and method of multi-axis neck force sensor for automotive crash dummy, which can quickly and accurately complete the calibration of multi-axis neck force sensor. The core problem lies in the inability to reliably solve the problems of clamping centering, accurate application and decoupling of complex loads, and high efficiency of the calibration process. SUMMARY

[0005] The present application aims to overcome the above-mentioned defects of the prior art and provide a calibration device and method of multi-axis neck force sensor for automotive crash dummy. The technical problem to be solved by the present application is: how to achieve fast and accurate clamping and centering of the neck force sensor; how to accurately simulate and apply the multi-dimensional load, including pressure and bending moment, that the neck force sensor bears in actual crash on one device; and how to simplify the calibration process to improve the calibration efficiency, accuracy and reliability.

[0006] To achieve the above object, the technical scheme adopted by the present application is as follows: In a first aspect, the present application provides a multi-axis neck force sensor calibration device for a car crash dummy, which comprises a ball platform, a force measurement system, a clamp system, a loading control system and a neck force sensor to be calibrated.

[0007] The clamp system is fixed to the neck force sensor to be calibrated by screws and a latch, and is placed on the ball platform, and then the loading control system applies and transmits force load values to the force measurement system, and different orientations of the clamp system are loaded to realize multi-axis calibration of the neck force sensor to be calibrated.

[0008] The ball platform is a rigid support platform for the entire device, which comprises a sliding platform, a horizontal ball disc and a base, the base is made of cast iron and is used to stabilize the moving position of the sliding platform and the horizontal ball disc, the horizontal ball disc is arranged between the sliding platform and the base and is used to provide low-friction movement of the sliding platform in the horizontal plane, the sliding platform is slidably connected to the bottom of the clamp system, and the horizontal ball disc is used to provide horizontal freedom and reduce the influence of external force generated by the sliding platform on data results, thereby ensuring the stability of the data results.

[0009] The force measurement system comprises a high-precision standard force sensor, a force loading rod and a ball head, the upper end of the standard force sensor is connected to the loading control system, and the lower end is connected to the interface of the force loading rod, and is used to monitor and feedback the standard load value in real time.

[0010] The clamp system is used for clamping and adjusting the neck force sensor to be calibrated, and comprises an angle adjustment platform and a sensor mounting support, the angle adjustment platform is installed on the sliding platform, and different placement modes thereof can realize calibration of different axes of the multi-axis neck force sensor to be calibrated.

[0011] Further, the sensor mounting support is fixedly connected to the neck force sensor to be calibrated through screws, the angle adjustment platform is provided with a positioning pin hole matched with an upper mounting hole of the neck force sensor to be calibrated, the design interface of the angle adjustment platform is matched with the upper mounting hole of the neck force sensor to be calibrated, and the angle adjustment platform is used for quickly and accurately positioning and fixing the neck force sensor to be calibrated.

[0012] The loading control system is electrically connected to the standard force sensor of the force measurement system, applies the required load through the force loading rod at the lower end, and collects and records the output signals of the standard force sensor and the neck force sensor to be calibrated.

[0013] Further, the force loading rod is provided with a ball head at the distal end, which is used to form a universal joint type connection with the ball socket on the angle adjustment platform and the sensor mounting support, so as to ensure that the load is transmitted in the direction of the force loading rod and avoid introducing lateral component force.

[0014] Through the cooperative adjustment of the ball platform and the angle adjustment platform, the mechanical center of the neck force sensor to be calibrated can be accurately coincided with the loading axis of the force loading rod, so that the accuracy of the applied force or torque is ensured, and the measurement deviation caused by the centering error is eliminated.

[0015] In a second aspect, the present application provides a calibration method for a multi-axis neck force sensor for a car crash dummy, comprising the following steps:

[0016] S1: installation: fix the neck force sensor to be calibrated on the sensor mounting support, connect and fix the neck force sensor to be calibrated with the angle adjustment platform through the bolt, level the mounting surface of the angle adjustment platform to the loading head of the neck force sensor to be calibrated through the adjustment of the supporting screw, and connect the ball socket on the clamp system with the ball head at the end of the force loading rod. Through the control of the ball platform, the sensor position is preliminarily adjusted, so that the force loading rod is in a free state without force.

[0017] S2: precise centering: for force calibration: adjust the sliding platform and the angle adjustment platform, so that the mechanical center of the neck force sensor to be calibrated is located on the load transmission path of the force loading rod; the fine adjustment can be performed by observing the output of each channel of the neck force sensor to be calibrated under a small load, until the output of the non-target channel approaches zero. For moment calibration: adjust the angle adjustment platform to accurately set the vertical distance between the loading axis of the force loading rod and the mechanical center of the sensor, which is the target force arm, and adjust the angle of the sensor through the angle rotation platform to ensure that the direction of the force arm is consistent with the target moment axis.

[0018] S3: execute calibration: set the loading program in the loading control system, determine the excitation voltage and the rated load of the axis to be calibrated, and perform the preloading, calibration loading, and unloading processes in the order of axial loading, so that the increasing and decreasing loads are transmitted to the force loading rod and the ball head; the preloading is to load the neck force sensor to be calibrated to the rated load, and then to zero load after holding, which is cycled three times; keep the neck force sensor to be calibrated without external contact, and read the output value of the current zero load; after the preloading is completed, the calibration loading is entered, the dummy force sensor is loaded from zero load to rated load, and in the calibration loading process, the data acquisition system synchronously acquires the data of each channel of the neck force sensor to be calibrated and the standard force sensor; the unloading process is to unload the neck force sensor to be calibrated from the rated load to the zero load, and the unloading speed should be consistent with the calibration loading speed.

[0019] S4: data analysis and calibration: for each calibration point, the output value of the neck force sensor to be calibrated and the standard load value are linearly regressed, and a series of parameters such as sensitivity, cross-talk, non-linearity, hysteresis are calculated to complete the calibration of the neck force sensor to be calibrated, generate a calibration report and calibration coefficients, and the cross-talk is divided into component axis cross-talk and main component cross-talk during torque calibration according to different channels.

[0020] The sensitivity is calculated by the following formula:

[0021] Wherein: The output sensitivity under the rated load during the calibration of the first component, i The output sensitivity under the rated load during the calibration of the first component, The rated output value under the rated load during the calibration of the first component, i The rated output value under the rated load during the calibration of the first component, The rated output value under the rated load during the calibration of the first component, i The rated output value under the rated load during the calibration of the first component, The rated load of the first component. i The cross-talk between the component axes is calculated by the following formula:

[0022] Wherein:

[0023] The cross-talk affecting the component The cross-talk affecting the component j The cross-talk affecting the component i The cross-talk affecting the component The maximum output value measured during the loading of the main component j The maximum output value measured during the loading of the main component i The maximum output value measured during the loading of the main component

[0024] During torque calibration, the formula for calculating the cross-talk of the torque channel to the main component in the neutral axis parallel to the torque channel loading is:

[0025] Wherein: The output of the standard force sensor when the component j The output of the standard force sensor when the component

[0026] These formulas are used to accurately quantify the various measurement characteristics of the neck force sensor to be calibrated.

[0027] From the above technical solutions of the present application, the beneficial effects of the present application are:

[0028] High calibration accuracy: through precise sliding plate and angle adjustment platform, accurate centering of the mechanical center of the neck force sensor to be calibrated and the loading axis can be realized, or the force arm can be accurately set, thereby fundamentally eliminating the system error caused by clamping deviation, and the accuracy and reliability of the calibration result are greatly improved.

[0029] Convenient clamping and improved efficiency: the special sensor mounting support realizes quick positioning and mounting of the neck force sensor to be calibrated, the cumbersome correction process on the general testing machine is saved, one person can operate, and the calibration efficiency is significantly improved.

[0030] Function integration, one machine with multiple functions: by adjusting the angle adjustment platform and the sliding plate, the action point of the force loading rod relative to the neck force sensor to be calibrated is changed, the calibration of axial force, shear force and bending moment around different shafts can be realized on one device, the functions are highly integrated, and the equipment investment and operation complexity are reduced.

[0031] Automation and reliability: loading is carried out by using a loading control system and a force measurement system, the movement is stable, the control is accurate, the device can be used with a computer and a data acquisition system to realize automation of the calibration process and digitization of data recording, human intervention is reduced, and the result is more reliable. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0033] Figure 1 A structure schematic view of a multi-axis neck force sensor calibration device for a car crash dummy in Fx direction measurement according to the present application;

[0034] Figure 2 A structure schematic view of a multi-axis neck force sensor calibration device for a car crash dummy in Fy direction measurement according to the present application;

[0035] Figure 3 A structure schematic view of a multi-axis neck force sensor calibration device for a car crash dummy in Fz direction measurement according to the present application;

[0036] Figure 4 A structure schematic view of a multi-axis neck force sensor calibration device for a car crash dummy in Mx direction measurement according to the present application;

[0037] Figure 5It is a structure schematic view of a multi-axis neck force sensor calibration device for a car crash dummy in the My direction measurement of the application;

[0038] Figure 6 It is a structure schematic view of a multi-axis neck force sensor calibration device for a car crash dummy in the Mz direction measurement of the application;

[0039] Figure 7 It is an exploded side view structure schematic view of a clamp system of a multi-axis neck force sensor calibration device for a car crash dummy of the application;

[0040] Figure 8 It is a reverse exploded side view structure schematic view of a clamp system of a multi-axis neck force sensor calibration device for a car crash dummy of the application;

[0041] Wherein: 1-ball platform, 2-force measurement system, 3-clamp system, 4-loading control system, 5-neck force sensor to be calibrated, 11-sliding platform, 12-horizontal ball disc, 13-base, 21-standard force sensor, 22-force loading rod, 23-ball head, 31-angle adjustment platform, 32-sensor mounting support. DETAILED DESCRIPTION

[0042] In order to make the skilled in the art better understand the technical solutions of the present application, the following will be further detailed in combination with the drawings and examples.

[0043] The up, down, left, right, front and back orientation terms in the present application are established based on the positional relationship shown in the drawings. Different drawings may change the corresponding positional relationship, so it cannot be understood as a limitation on the protection scope.

[0044] In the present application, the terms "installation", "connection", "interface", "connection", "fixation" and the like should be understood broadly, for example, it can be fixed connection, it can also be detachable connection, it can also be integrally connected, it can also be mechanical connection, it can also be electrical connection or can communicate with each other, it can also be direct connection, it can also be indirect connection through intermediate medium, it can be the interconnection of two components, or it can be the interaction relationship of two components. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific situation.

[0045] As Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6As shown, in the embodiment of the present application, a multi-axis neck force sensor calibration device for a car crash dummy comprises a ball platform 1, a force measurement system 2, a clamp system 3, a loading control system 4, and a neck force sensor 5 to be calibrated.

[0046] The clamp system 3 is fixed to the neck force sensor 5 to be calibrated by screws and pins, and is placed on the ball platform 1. The loading control system 4 applies and transmits a force load value to the force measurement system 2. By loading the clamp system 3 in different directions, multi-axis calibration of the neck force sensor 5 to be calibrated is achieved.

[0047] The ball platform 1 is a rigid support platform of the entire device, which comprises a sliding plate 11, a horizontal ball disc 12, and a base 13. The base 13 is made of cast iron and is used to stabilize the moving position of the sliding plate 11 and the horizontal ball disc 12. The horizontal ball disc 12 is arranged between the sliding plate 11 and the base 13, and is used to provide low-friction movement of the sliding plate 11 in the horizontal plane. The sliding plate 11 is slidably connected to the bottom of the clamp system 3. The horizontal ball disc 12 is used to provide horizontal freedom and reduce the influence of external force on the data results generated by the sliding plate 11, thereby ensuring the stability of the data results.

[0048] The force measurement system 2 comprises a high-precision standard force sensor 21, a force loading rod 22, and a ball head 23. The upper end of the standard force sensor 21 is connected to the loading control system 4, and the lower end is connected to the interface of the force loading rod 22. The standard force sensor 21 is used to monitor and feedback the standard load value in real time.

[0049] The clamp system 3 is used to clamp and adjust the neck force sensor 5 to be calibrated. It comprises an angle adjustment platform 31 and a sensor mounting support 32. The angle adjustment platform 31 is installed on the sliding plate 11. Different placement modes of the angle adjustment platform 31 can achieve calibration of the neck force sensor 5 to be calibrated in different axial directions.

[0050] The sensor mounting support 32 is fixedly connected to the neck force sensor 5 to be calibrated by screws. The angle adjustment platform 31 is provided with a positioning pin hole matched with an upper mounting hole of the neck force sensor 5 to be calibrated. The design interface of the angle adjustment platform 31 matches the upper mounting hole of the neck force sensor 5 to be calibrated, and is used to quickly and accurately position and fix the neck force sensor to be calibrated.

[0051] The loading control system 4 is electrically connected to the standard force sensor 21 of the force measurement system 2. The required load is applied through the force loading rod 22 at the lower end, and the output signals of the standard force sensor 21 and the neck force sensor 5 to be calibrated are collected and recorded.

[0052] The end of the force loading rod 22 is provided with a ball head 23 for forming a universal joint with the ball socket on the angle adjusting platform 31 and the sensor mounting support 32, ensuring that the load is transmitted along the direction of the force loading rod 22, avoiding the introduction of lateral force.

[0053] Through the cooperative adjustment of the ball platform 1 and the angle adjusting platform 31, the mechanical center of the neck force sensor 5 to be calibrated can be accurately coincided with the loading axis of the force loading rod 22, thereby ensuring the accuracy of the applied force or torque and eliminating the measurement deviation caused by the centering error.

[0054] As shown in Figure 7 , Figure 8 , the sensor mounting support 32 is a four-edge claw-shaped structure, the upper surface of which is adapted to fit the lower end plane of the neck force sensor 5 to be calibrated and is fixedly installed through screws; the upper mounting hole of the neck force sensor 5 to be calibrated is fixed through a latch with the designed interface of the angle adjusting platform 31, which is a universal functional base, and a tight fit is formed between the angle adjusting platform 31 and the upper part of the neck force sensor 5 to be calibrated through the rotation of the support screw at the bottom; the ball socket is provided on the angle adjusting platform 31 and the sensor mounting support 32, and the load direction acting on the ball socket at different positions represents the calibration direction of the neck force sensor 5 to be calibrated in different axial directions.

[0055] Taking the Fx direction of the neck force sensor 5 to be calibrated as an example, as shown in Figure 1 , the jig system 3 with the neck force sensor 5 to be calibrated assembled is placed on the ball platform 1, and the placement direction needs to satisfy that the X axis of the sensor is parallel or coincided with the loading axis direction of the force measuring system 2 and the jig system 3; the ball head 23 is used for force transmission between the force loading rod 22 of the force measuring system 2 and the ball socket in the Fx axial direction of the jig system 3; the position of the neck force sensor 5 to be calibrated is preliminarily adjusted through the control of the ball platform 1, so that the force loading rod 22 is in a free state without force.

[0056] As shown in Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , for the calibration of the force and torque channels of the Fy, Fz, Mx, My and Mz channels, only the placement direction of the jig system 3 and the force action point of the ball head 23 need to be adjusted, so that the loading direction is consistent with the actual use condition.

[0057] A calibration method applied to the neck force sensor calibration device for a car crash dummy as described above, comprising the following steps:

[0058] S1: installation: fix the neck force sensor 5 to be calibrated on the sensor mounting support 32, connect and fix the neck force sensor 5 to be calibrated with the angle adjusting platform 31 through the latch, adjust the mounting surface of the angle adjusting platform 31 to be flat to the loading head of the neck force sensor 5 to be calibrated through the supporting screw, connect the ball socket on the clamp system 3 with the ball head 23 at the end of the force loading rod 22, and preliminarily adjust the calibration position of the neck force sensor 5 to be calibrated through the control of the ball platform 1, so that the force loading rod 22 is in a free state without force.

[0059] S2: precise centering: adjust the sliding plate 11 and the angle adjusting platform 31, so that the mechanical center of the neck force sensor 5 to be calibrated is located on the load transmission path of the force loading rod 22; adjust the supporting screw of the angle adjusting platform 31 through fine adjustment, so that the output value of the non-target channel of the calibration neck force sensor 5 is less than ±1% of the rated output; for bending moment calibration, further adjust the angle adjusting platform 31, set the vertical distance between the loading axis of the force loading rod 22 and the mechanical center of the sensor as the force arm, and adjust the direction of the force arm to be consistent with the target bending moment axis.

[0060] S3: execute calibration: set the loading program in the loading control system 4, determine the excitation voltage and the rated load of the calibrated shaft, and perform the preloading, calibration loading, and unloading processes in sequence according to the axial loading sequence, so that the increasing and decreasing loads are transmitted to the force loading rod 22 and the ball head 23; the preloading is to load the neck force sensor 5 to be calibrated to the rated load, and then to zero load after holding, which is cycled three times; keep the neck force sensor 5 to be calibrated without external contact, and read the output value of the current zero load; after the preloading is completed, the calibration loading is entered, and the dummy force sensor is loaded from zero load to rated load; during the calibration loading process, the data acquisition system synchronously acquires data of each channel of the neck force sensor 5 to be calibrated and the standard force sensor 21; the unloading process is to unload the neck force sensor 5 to be calibrated from the rated load to zero load, and the unloading speed should be consistent with the calibration loading speed.

[0061] S4: data analysis and calibration: for each calibration point, perform linear regression analysis on the output value of the neck force sensor 5 to be calibrated and the standard load value, complete the calibration of the neck force sensor 5 to be calibrated through a series of parameters such as sensitivity, cross talk, nonlinearity, and hysteresis, generate a calibration report and calibration coefficients, and divide the cross talk according to the calibration of different channels into component axis cross talk and main component cross talk during torque calibration.

[0062] Sensitivity calculation:

[0063] Sensitivity is the ratio between the output signal of the sensor and the input load, which reflects the basic response characteristics of the sensor. For the first calibration channel, i i ​It can represent any one of Fx, Fy, Fz, Mx, My, Mz, and its sensitivity The calculation formula is:

[0064] in: Indicates the first i Under the calibration channels of each component, the rated load is applied. At that time, the rated output value of the neck force sensor 5 to be calibrated is in mV; This indicates that the force applied to the neck force sensor 5 to be calibrated i The excitation voltage value for each channel, in V; This indicates the force applied to the first force as measured by the standard force sensor 21. i The rated load value for each calibration channel, in N or Nm.

[0065] Calculation of inter-axis crosstalk of components:

[0066] Inter-axis crosstalk is an indicator that measures the extent of interference caused to other channels when one channel is subjected to force. Calculating the... j The component is related to the first... i Interaxial crosstalk of each principal component The formula is:

[0067] in: Indicates only for the first j Each component is applied from zero to the rated value. During the calibration load process, the first neck force sensor 5 to be calibrated i The maximum value of the output voltage signal measured by each main component channel, in mV; The first one calculated according to the aforementioned formula i The sensitivity of each principal component is expressed in mV / V / N. This indicates the force applied to the first force as measured by the standard force sensor 21. i The rated load value for each calibration channel, in N or Nm.

[0068] Principal component crosstalk calculation in torque calibration:

[0069] When calibrating the torque channel, it is necessary to evaluate the impact of loads in other directions on the torque channel; calculate the first load on the neutral axis parallel to the torque channel. j The force or torque component affects the first i Crosstalk of the principal components of torque The formula is:

[0070] in: Indicates only for the first j During the calibration load application from zero to the rated value for each component, the neck force sensor 5 to be calibrated... i The maximum value of the output voltage signal measured by each torque principal component channel, in mV; The first one calculated according to the aforementioned formula i The sensitivity of each principal component of torque, in mV / V / Nm; In the first j During the loading process of each component, the reference load value measured and output by the standard force sensor 21 is in N; Indicates the first i The rated torque load value of each principal torque component, in Nm.

[0071] According to the above calibration method, a neck force sensor 5 to be calibrated was calibrated. Table 1 summarizes the output signal of each channel under rated load and the calculated sensitivity value. Based on the sensitivity results in Table 1, the inter-axis crosstalk between specific channels was further analyzed, and the relevant data and calculation results are summarized in Table 2. In this example, it is assumed that the excitation voltage of the sensor is... Both are 10 V, and the internal lever arm of the calibrated neck force sensor 5 is 0.01778 m.

[0072] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention. The scope of the invention is defined by the appended claims and their equivalents, all of which should be included within the scope of protection of the invention.

[0073]

[0074]

Claims

1. A calibration device for a multi-axis neck force sensor used in a car crash dummy, characterized in that, include: Ball bearing platform (1), force measurement system (2), fixture system (3), loading control system (4), neck force sensor to be calibrated (5); The ball platform (1) includes: a sliding plate (11), a horizontal ball disk (12), and a base (13). The ball platform (1) is used to provide the clamping system (3) with the degree of freedom of movement in the horizontal plane. The force measurement system (2) includes a standard force sensor (21), a force loading rod (22), and a ball head (23). The standard force sensor (21) is connected to the loading control system (4). The clamping system (3) includes an angle adjustment platform (31) and a sensor mounting bracket (32). The clamping system (3) is set on the ball platform (1) and is used to install and position the neck force sensor (5) to be calibrated in order to achieve multi-axial calibration posture. The loading control system (4) is used to apply load through the force measurement system (2) and simultaneously acquire the output signals of the standard force sensor (21) and the neck force sensor (5) to be calibrated.

2. The multi-axis neck force sensor calibration device for a car crash dummy according to claim 1, characterized in that, The sensor mounting bracket (32) is fixedly connected to the neck force sensor (5) to be calibrated by screws. The neck force sensor (5) to be calibrated is fixed on the angle adjustment platform (31) by a pin. The angle adjustment platform (31) is provided with a positioning pin hole that matches the upper mounting hole of the neck force sensor (5) to be calibrated.

3. The multi-axis neck force sensor calibration device for a car crash dummy according to claim 1, characterized in that, The base (13) of the ball platform (1) is made of cast iron, and the horizontal ball disk (12) is disposed between the sliding plate (11) and the base (13).

4. The multi-axis neck force sensor calibration device for a car crash dummy according to claim 1, characterized in that, The ball head (23) at the end of the force loading rod (22) engages with the ball socket provided on the clamping system (3) to form a universal joint connection.

5. A calibration method for a multi-axis neck force sensor calibration device for an automotive collision dummy as described in any one of claims 1 to 4, characterized in that, Includes the following steps: S1: Installation: Fix the neck force sensor (5) to be calibrated on the sensor mounting bracket (32), connect and fix the neck force sensor (5) to be calibrated to the angle adjustment platform (31) by the pin, adjust the mounting surface of the angle adjustment platform (31) to the loading head of the neck force sensor (5) to be calibrated by adjusting the support screw, and connect the ball socket on the clamping system (3) to the ball head (23) at the end of the force loading rod (22). By controlling the ball platform (1), initially adjust the calibration position of the neck force sensor (5) to be calibrated, so that the force loading rod (22) is in a free state without force. S2: Precision alignment: Adjust the sliding plate (11) and the angle adjustment platform (31) so that the mechanical center of the neck force sensor (5) to be calibrated is located on the load transmission path of the force loading rod (22); by applying a small load and observing the output of each channel of the neck force sensor (5) to be calibrated, fine-tune until the output of the non-target channel approaches zero; For bending moment calibration, the angle adjustment platform (31) is further adjusted, the vertical distance between the loading axis of the force loading rod (22) and the mechanical center of the sensor is set as the lever arm, and the lever arm direction is adjusted to be consistent with the target bending moment axis; S3: Perform calibration: Set the loading program in the loading control system (4), determine the excitation voltage and rated load of the axis to be calibrated, and perform preloading, calibration loading and unloading processes according to the axial loading sequence, and transfer the increasing and decreasing loads to the force loading rod (22) and the ball head (23); preloading is to load the neck force sensor (5) to be calibrated to the rated load, maintain the load and then reduce it to zero load, and repeat three times; Keep the neck force sensor (5) to be calibrated out of external contact and read the current zero-load output value; After the preloading is completed, the calibration loading is started. The dummy human force sensor is loaded from zero load to rated load. During the calibration loading process, the data acquisition system synchronously acquires data from each channel of the neck force sensor (5) to be calibrated and the standard force sensor (21). The unloading process involves unloading the neck force sensor (5) to be calibrated from its rated load to zero load, and the unloading speed should be consistent with the calibration loading speed. S4: Data analysis and calibration: For each calibration point, perform linear regression analysis on the output value of the neck force sensor (5) to be calibrated and the standard load value, calculate a series of parameters such as the sensitivity, crosstalk, nonlinearity, and hysteresis of the channel to complete the calibration of the neck force sensor (5), generate a calibration report and calibration coefficients. Crosstalk is divided into component axis crosstalk and principal component crosstalk during torque calibration according to the calibration of different channels.

6. The calibration method for a multi-axis neck force sensor in a car crash dummy according to claim 5, characterized in that, In step S4, calculate the first... i Sensitivity of each calibration channel The formula is: in: Indicates the first i Under the calibration channels of each component, the rated load is applied. At that time, the rated output value of the neck force sensor (5) to be calibrated, This indicates that the force applied to the neck force sensor (5) to be calibrated is... i The excitation voltage value of each channel, This indicates the force applied to the first force sensor (21), as measured by the standard force sensor (21). i Rated load values ​​for each calibration channel; Calculate the first j The component is related to the first... i Interaxial crosstalk of each principal component The formula is: in: Indicates only for the first j Each component is applied from zero to the rated value. During the calibration load process, the first neck force sensor (5) to be calibrated i The maximum value of the output voltage signal measured by each main component channel; The first one calculated according to the aforementioned formula i Sensitivity of each principal component; This indicates the force applied to the first force sensor (21), as measured by the standard force sensor (21). i Rated load values ​​for each calibration channel; When performing torque channel calibration, calculate the first [value] within the neutral axis loaded parallel to the torque channel. j The force or torque component affects the first i Crosstalk of the principal components of torque : in: Indicates only for the first j During the calibration load process from zero to the rated value applied to each component, the neck force sensor (5) to be calibrated (5) i The maximum value of the output voltage signal measured by each torque principal component channel; The first one calculated according to the aforementioned formula i Sensitivity of the principal components of torque; In the first j During the loading process of each component, the reference load value is measured and output by the standard force sensor (21); Indicates the first i The rated torque load value of each principal torque component.

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