阅读说明：本技术 一种减震器预紧力测试系统及测试方法 (Shock absorber pre-tightening force test system and test method ) 是由 沈晓庆 于 2021-09-27 设计创作，主要内容包括：本发明公开了一种减震器预紧力测试系统及测试方法,涉及汽车减震器领域,包括应变传感器等,应变传感器作为一个支臂与三个阻值相同的电阻以惠斯通电桥的形式相互电连接形成桥路单元,桥路单元的第一节点与第三节点之间施加电源电势E,采集单元电连接在第二节点与第四节点上用于采集测量电势e-(0),电脑与采集单元电连接用于根据测量电势e-(0)计算出对应的应变值并显示和记录应变信号,供电电源与电脑电连接实现供电；应变传感器固定在待测减震器的缸体上,用于感应缸体的应变。本发明利用应变传感器测能够方便快捷的检测出震器的封口预紧力,为提高减震器封口质量提供了数据支持。并为以后研究减震器其他性能打下了基础。(The invention discloses a shock absorber pretightening force testing system and a testing method, which relate to the field of automobile shock absorbers and comprise a strain sensor and the like, wherein the strain sensor is used as a support arm and is electrically connected with three resistors with the same resistance value in a Wheatstone bridge manner to form a bridge circuit unit, a power supply potential E is applied between a first node and a third node of the bridge circuit unit, and a collecting unit is electrically connected to the second node and a fourth node and is used for collecting and measuring the potential E 0 The computer is electrically connected with the acquisition unit and used for measuring the potential e 0 Calculating a corresponding strain value, displaying and recording a strain signal, and electrically connecting a power supply with a computer to realize power supply; the strain sensor is fixed on the cylinder body of the damper to be measured and used for sensing strain of the cylinder body. The invention can conveniently and quickly detect the sealing device of the vibrator by utilizing the strain sensor to measureThe tightening force provides data support for improving the sealing quality of the shock absorber. And lays a foundation for researching other properties of the shock absorber in the future.)

1. Pretightening force of shock absorberTest system, its characterized in that: the device comprises a strain sensor (1), a bridge circuit unit (2), an acquisition unit (3), a computer (4), a power supply (5) and a shock absorber (6) to be measured, wherein the strain sensor (1) is used as a support arm and is electrically connected with three resistors (R1, R2 and R3) with the same resistance in a Wheatstone bridge mode to form the bridge circuit unit (2), a power supply potential E is applied between a first node (2a) and a third node (2c) of the bridge circuit unit (2), the power supply (5) is electrically connected to the first node (2a) and the third node (2c) and is used for providing the power supply potential E, and a measurement potential E is formed between a second node (2b) and a fourth node (2d) of the bridge circuit unit (2)₀The collecting unit (3) is electrically connected to the second node (2b) and the fourth node (2d) for collecting the measuring potential e₀The computer (4) is electrically connected with the acquisition unit (3) and is used for measuring the potential e₀Calculating a corresponding strain value, displaying and recording a strain signal, and electrically connecting a power supply (5) with a computer (4) to realize power supply; the strain sensor (1) is fixed on a cylinder body (6-1) of the shock absorber (6) to be tested and used for sensing strain of the cylinder body (6-1).

2. A test method using the shock absorber pretension testing system according to claim 1, characterized in that: the method comprises the following steps:

1) the method comprises the following steps that a strain sensor (1) is pasted on a cylinder body (6-1) of a shock absorber (6) to be tested, the strain sensor (1) and three resistors (R1, R2 and R3) with the same resistance are mutually and electrically connected in a Wheatstone bridge mode to form a bridge circuit unit (2), a power supply (5) is electrically connected to a first node (2a) and a third node (2c) of the bridge circuit unit (2), an acquisition unit (3) is electrically connected to a second node (2b) and a fourth node (2d) of the bridge circuit unit (2), and the acquisition unit (3), a computer (4) and the power supply (5) are sequentially and electrically connected;

2) cutting the damper (6) to be tested along the sealing position of the cylinder body (6-1), and recording a strain signal in the whole course of the computer (4) to obtain a strain value X of the damper (6) to be tested when the sealing is cut₀At the moment, the pretightening force of the shock absorber (6) to be tested is 0;

3) fixing a damper (6) to be tested with a cut seal on a test bed, applying a load along the axial direction of a cut position, simulating a pretightening force F, gradually increasing the pretightening force F, acquiring a strain signal X corresponding to the pretightening force F by an acquisition unit (3), and finally obtaining a pretightening force-strain calibration relation F (F) (X) after processing and fitting by a computer (4);

4) according to the calibration relation F ═ F (X) of the pretightening force-strain obtained in the step 3), when the strain X is 0, obtaining the initial pretightening force F of the shock absorber (6) to be tested₀。

3. The test method as set forth in claim 2, wherein: in the step 1), a plurality of strain sensors (1) are pasted at different positions of the cylinder body (6-1) and used for sensing the strain at different positions on the cylinder body (6-1).

4. The test method as set forth in claim 2, wherein: in the step 3), the strain value X of the shock absorber (6) to be tested is obtained when the pretightening force F obtained in the step 2) is equal to 0₀The test was performed by substituting F ═ F (x).

Technical Field

The invention relates to the field of automobile shock absorbers, in particular to a shock absorber pretightening force testing system and a shock absorber pretightening force testing method.

Background

The shock Absorber (Absorber) is used to suppress the shock of the spring absorbing the shock and the impact from the road surface, and is widely used in the automobile parts to accelerate the attenuation of the vibration of the frame and the body, so as to improve the ride comfort of the automobile. After the damper is sealed, the working cylinder is in a pre-tightening state, and the oil storage cylinder is in a stretching state. When the quality of the seal is not good, the shock absorber is easy to have abnormal sound and even oil leakage. However, currently, the research on the pretightening force in the damper industry is not much, and the pretightening force of the seal of the damper is not supported in data.

Disclosure of Invention

The invention aims to overcome the defects in the prior art, and provides a shock absorber pretightening force testing system and a shock absorber pretightening force testing method, which have the advantages of simple structure and convenience in testing.

The purpose of the invention is achieved by the following technical scheme: a shock absorber pretightening force test system comprises a strain sensor, a bridge unit, an acquisition unit, a computer, a power supply and a shock absorber to be tested, wherein the strain sensor is used as a support arm and is electrically connected with three resistors R1, R2 and R3 with the same resistance in a Wheatstone bridge mode to form the bridge unit, a power supply potential E is applied between a first node and a third node of the bridge unit, the power supply is electrically connected to the first node and the third node and used for providing the power supply potential E, and a measurement potential E is formed between a second node and a fourth node of the bridge unit₀The acquisition unit is electrically connected to the second node and the fourth node and is used for acquiring the measurement potential e₀The computer is electrically connected with the acquisition unit and used for measuring the potential e₀Calculating a corresponding strain value, displaying and recording a strain signal, and electrically connecting a power supply with a computer to realize power supply; and the strain sensor is fixed on the cylinder body of the damper to be tested and used for sensing the strain of the cylinder body.

The testing method adopting the shock absorber pretightening force testing system comprises the following steps:

1) adhering a strain sensor to a cylinder body of a shock absorber to be tested, electrically connecting the strain sensor and three resistors R1, R2 and R3 with the same resistance value with each other in a Wheatstone bridge mode to form a bridge circuit unit, electrically connecting a power supply to a first node and a third node of the bridge circuit unit, electrically connecting an acquisition unit to a second node and a fourth node of the bridge circuit unit, and electrically connecting the acquisition unit, a computer and the power supply in sequence;

2) cutting the damper to be tested along the sealing position of the cylinder body, and recording a strain signal through the whole course of a computer to obtain a strain value X of the damper to be tested when the sealing is cut₀At the moment, the pretightening force of the shock absorber to be tested is 0;

3) fixing the cut and sealed damper to be tested on a test bed, applying a load along the axial direction of the cut position, simulating a pretightening force F, gradually increasing the pretightening force F, acquiring a strain signal X corresponding to the pretightening force F by an acquisition unit, and finally obtaining a pretightening force-strain calibration relation F (F) (X) after computer processing and fitting;

4) obtaining the initial pretightening force F of the shock absorber to be tested when the strain X is 0 according to the calibration relation F ═ F (X) of the pretightening force-strain obtained in the step 3)₀。

As a preferable technical solution, in the step 1), a plurality of strain sensors are pasted at different positions of the cylinder body for sensing the strain at different positions on the cylinder body.

Preferably, in the step 3), the strain value X of the damper under test when the pretension force F obtained in the step 2) is 0 is set in the step 3)₀The test was performed by substituting F ═ F (x).

The invention has the beneficial effects that: the strain sensor is utilized to measure the sealing pretightening force of the shock absorber, so that the sealing pretightening force can be conveniently and quickly detected, and data support is provided for improving the sealing quality of the shock absorber. And lays a foundation for researching other properties of the shock absorber in the future.

Drawings

FIG. 1 is a flowchart illustrating the operation of the pre-tightening force testing system of the shock absorber.

Fig. 2 is a schematic structural diagram of a damper under test.

FIG. 3 is a schematic diagram of a bridge unit.

FIG. 4 is a schematic structural diagram of the damper under test applying a load axially along the notch position.

FIG. 5 is a diagram illustrating a calibration relationship between pre-tightening force and strain.

Description of reference numerals: the device comprises a strain sensor 1, a bridge circuit unit 2, a first node 2a, a second node 2b, a third node 2c, a fourth node 2d, an acquisition unit 3, a computer 4, a power supply 5, a damper 6 to be tested and a cylinder 6-1.

Detailed Description

The invention will be described in detail below with reference to the following drawings:

example (b): as shown in fig. 1 to 3, a shock absorber pre-tightening force testing system comprises a strain sensor 1, a bridge unit 2, an acquisition unit 3, a computer 4, a power supply 5 and a shock absorber 6 to be tested, wherein the strain sensor 1 is used as a support arm and is electrically connected with three resistors R1, R2 and R3 with the same resistance in a wheatstone bridge manner to form the bridge unit 2, a power supply potential E is applied between a first node 2a and a third node 2c of the bridge unit 2, the power supply 5 is electrically connected to the first node 2a and the third node 2c to provide the power supply potential E, and a measurement potential E is formed between a second node 2b and a fourth node 2d of the bridge unit 2₀The collecting unit 3 is electrically connected to the second node 2b and the fourth node 2d for collecting the measuring potential e₀The computer 4 is electrically connected with the acquisition unit 3 and is used for measuring the potential e₀Calculating a corresponding strain value, displaying and recording a strain signal, and electrically connecting a power supply 5 with a computer 4 to realize power supply; the strain sensor 1 is fixed on a cylinder body 6-1 of the shock absorber 6 to be tested and used for sensing strain of the cylinder body 6-1.

The testing method adopting the shock absorber pretightening force testing system comprises the following steps:

1) the method comprises the following steps of pasting a plurality of strain sensors 1 at different positions on a cylinder body 6-1 of a shock absorber 6 to be tested, electrically connecting each strain sensor 1 with three resistors R1, R2 and R3 with the same resistance in a Wheatstone bridge mode to form a bridge circuit unit 2, electrically connecting a power supply 5 on a first node 2a and a third node 2c of the bridge circuit unit 2, electrically connecting an acquisition unit 3 on a second node 2b and a fourth node 2d of the bridge circuit unit 2, and electrically connecting the acquisition unit 3, a computer 4 and the power supply 5 in sequence;

2) will be ready forThe damper 6 is cut along the sealing position of the cylinder 6-1, and the strain signal is recorded in the whole course of the computer 4 to obtain the strain value X of the damper 6 to be measured when the sealing is cut₀At this time, the pretightening force of the damper 6 to be tested is 0;

3) as shown in fig. 4, the damper 6 to be tested, which is cut and sealed, is fixed on a test bed (which plays a role in supporting and fixing), a load is applied in the axial direction of the cut position of the cylinder 6-1, a pre-tightening force F is simulated, the pre-tightening force F is gradually increased, a strain signal X corresponding to the pre-tightening force F is acquired by the acquisition unit 3, and a calibration relationship F (F) (X) between the pre-tightening force and the strain is finally obtained after processing and fitting by the computer 4, as shown in fig. 5, for the damper 6 to be tested, the calibration relationship between the pre-tightening force and the strain is: f (X) -46.791X + 716.61; the strain value X of the shock absorber 6 to be tested when the pretightening force F obtained in the step 2) is equal to 0₀Testing by substituting F-46.791X + 716.61;

4) according to the calibration relation F ═ F (X) of the pretightening force-strain obtained in the step 3), when the strain X is 0, obtaining the initial pretightening force F of the damper 6 to be tested₀，F₀＝f(0)＝716.61。

The invention utilizes the strain sensor (namely a resistance strain gauge) to convert the strain into the electrical parameter for testing, because the strain sensor is pasted on the surface of the cylinder body of the damper to be tested, the resistance of the strain sensor can change along with the deformation of the surface of the cylinder body, and the variable measuring potential e can be generated under the action of a Wheatstone bridge (namely a bridge circuit unit)₀And converting by a computer to obtain a strain value of the shock absorber to be tested. Meanwhile, a form of simulating the pretightening force by using an external load is adopted, a calibration relation between the pretightening force and strain is fitted, the pretightening force at the sealing position of the damper to be tested is finally obtained, and data support is provided for improving the sealing quality of the damper. And lays a foundation for researching other properties of the shock absorber in the future. .

It should be understood that equivalent substitutions and changes to the technical solution and the inventive concept of the present invention should be made by those skilled in the art to the protection scope of the appended claims.