A suspension force testing method

Abstract

The present invention provides a suspension force test method, including 1) performing an actual road test on the suspension structure of a target vehicle and recording the test data; 2) calibrating and obtaining the linear stiffness curve of the suspension rubber in the suspension structure of the target vehicle to obtain the linear segment stiffness value K; measuring the rigid contact distance L1 between the suspension rubber and the active end bracket and the rigid contact distance L2 between the suspension rubber and the passive end bracket under static load; 3) installing the active end bracket strain gauge groups Y1 and Y2, and calibrating and obtaining the relationship coefficients K1 and K2 between the load F and Y1 and Y2 when L1 and L2=0 respectively; 4) calculating the suspension force F according to the linear relationship between the obtained loading force and the strains of the active end and passive end brackets. The method of the present invention can realize the measurement of the suspension force of the suspension structure without modifying the suspension structure. Compared with the traditional test method, it can be applied to the suspension force test that cannot perform three-division force measurement due to the suspension structure and layout space.

Description

Technical Field

[0001] The invention relates to the technical field of suspension force measurement, and in particular to a suspension force testing method. Background Art

[0002] Traditional suspension force measurement generally involves modifying the suspension structure, embedding a standard three-force sensor, and directly measuring the suspension force. However, some suspensions cannot be measured with a three-force sensor due to narrow layout space and difficulty in suspension modification. At the same time, since the stiffness of the suspension rubber is linear before contact with the active and passive ends, and nonlinear after contact, it is impossible to test the suspension force using only stress-strain or suspension displacement. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a suspension force testing method. Without modifying the suspension structure, the strain and suspension displacement of the active end bracket and the passive end bracket are calibrated and measured, and combined with the suspension stiffness characteristics, the suspension force of the suspension structure is measured. The method is suitable for suspension force testing where three-force measurement cannot be performed due to the suspension structure and layout space.

[0004] To achieve the above object, the present invention proposes a suspension force testing method, comprising the following steps:

[0005] Step S1. Calibrate and obtain the linear stiffness curve of the suspension rubber in the target automobile suspension structure, and then obtain its linear segment stiffness value K; measure the rigid contact distance L1 between the suspension rubber and the active end bracket in a static load state, and measure the rigid contact distance L2 between the suspension rubber and the passive end bracket in a static load state;

[0006] Step S2. Install the active end bracket strain gauge group Y1, and when L1=0, calibrate to obtain the relationship coefficient K1 between the load F and Y1; install the active end bracket strain gauge group Y2, and when L2=0, calibrate to obtain the relationship coefficient K2 between the load F and Y1;

[0007] Step S3. Performing an actual road test on the suspension structure of the target vehicle and recording the test data;

[0008] Step S4. Calculate the suspension force F according to the linear relationship between the loading force and the strains of the active end bracket and the passive end bracket obtained in the above steps, combined with the actual displacement data of the suspension rubber of the automobile suspension structure.

[0009] Specifically, the test data recorded in step S1 include: active end bracket strain value B1, passive end strain value B2, and suspension rubber displacement D.

[0010] Specifically, the calibration in step S2 obtains the linear stiffness curve of the suspension rubber in the target automobile suspension structure, and then obtains its linear segment stiffness value K, and the linear segment region is L1≤D≤L2.

[0011] Specifically, the calculation method of the suspension force F in step S4 is as follows:

[0012] ①When D>L1,

[0013] F=B1×K1+D×K;

[0014] ② When D>L2,

[0015] F = B2 × K2 + D × K;

[0016] ③ When L1≤D≤L2,

[0017] F=D×K.

[0018] The beneficial effects of the present invention compared with the prior art are as follows:

[0019] The present invention provides a suspension force testing method, which does not require modification of the suspension structure. By calibrating and measuring the strain and suspension displacement of the active end bracket and the passive end bracket and combining the suspension stiffness characteristics, the suspension force of the suspension structure can be measured. Compared with the traditional testing method, the suspension force test can be applied to suspension force tests where three-force measurement cannot be performed due to the suspension structure and layout space. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the suspension structure of the present invention;

[0021] Figure 2 Schematic diagram of the calculation process of the suspension force F of the present invention;

[0022] In the figure: 1. Active end bracket; 2. Passive end bracket; 3. Suspension rubber; 4. Vehicle frame; 5. Active end bracket strain gauge group Y1; 6. Passive end bracket strain gauge group Y2; 7. Suspension rubber displacement D. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] Example: See Figure 1-Figure 2 .

[0025] The present invention provides a suspension force testing method, comprising the following steps:

[0026] Step S1. Calibrate and obtain the linear stiffness curve of the suspension rubber in the target automobile suspension structure, and then obtain the stiffness value K of its linear segment (L1≤D≤L2); measure the rigid contact distance L1 between the suspension rubber and the active end bracket in a static load state, and measure the rigid contact distance L2 between the suspension rubber and the passive end bracket in a static load state;

[0027] Step S2. Figure 1 As shown, the active end bracket strain gauge group Y1 is installed, and when L1=0, the relationship coefficient K1 between the load F and Y1 is obtained by calibration; the active end bracket strain gauge group Y2 is installed, and when L2=0, the relationship coefficient K2 between the load F and Y1 is obtained by calibration;

[0028] Step S3. Performing actual road testing on the suspension structure of the target vehicle, and recording test data, including: active end bracket strain value B1, passive end strain value B2, suspension rubber displacement D;

[0029] Step S4. Calculate the suspension force F according to the linear relationship between the loading force and the strains of the active end bracket and the passive end bracket obtained in the above steps, combined with the actual displacement data of the suspension rubber of the automobile suspension structure;

[0030] like Figure 2 The specific calculation method is as follows:

[0031] ①When D>L1,

[0032] F=B1×K1+D×K;

[0033] ② When D>L2,

[0034] F = B2 × K2 + D × K;

[0035] ③ When L1≤D≤L2,

[0036] F=D×K.

[0037] The above is only a preferred embodiment of the present invention, and does not limit the structure of the present invention in any form. Any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention are within the scope of the technical solution of the present invention.

Claims

1. A suspension force testing method, characterized in that: The following steps are involved: Step S1. Calibrate and obtain the linear stiffness curve of the suspension rubber in the target automobile suspension structure, and then obtain its linear segment stiffness value K, the linear segment area is L1≤D≤L2; measure the rigid contact distance L1 between the suspension rubber and the active end bracket in a static load state, and measure the rigid contact distance L2 between the suspension rubber and the passive end bracket in a static load state; Step S2. Install the active end bracket strain gauge group Y1, and when L1=0, calibrate to obtain the relationship coefficient K1 between the loading force and Y1; install the passive end bracket strain gauge group Y2, and when L2=0, calibrate to obtain the relationship coefficient K2 between the loading force and Y2; Step S3. Performing actual road testing on the suspension structure of the target vehicle and recording the test data; The recorded test data include: active end bracket strain value B1, passive end strain value B2, suspension rubber displacement D; Step S4. Calculate the suspension force F according to the linear relationship between the loading force obtained in the above steps and the strains of the active end bracket and the passive end bracket, combined with the actual displacement data of the suspension rubber of the automobile suspension structure; the calculation method is as follows: ① When D>L1, F = B1 × K1 + D × K; ② When D>L2, F = B2 × K2 + D × K; ③ When L1≤D≤L2, F=D×K.

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