Dynamic stiffness evaluation and test method for vehicle body attachment point
A test method and attachment point technology, applied in vehicle testing, elastic testing, machine/structural component testing, etc., can solve problems such as inability to perform comprehensive evaluation, and achieve the effect of saving time and material costs
Pending Publication Date: 2021-11-12
JIANGLING MOTORS
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Problems solved by technology
[0003] Traditional evaluation and testing methods can only evaluate single-hole installation points, and some accessories require multi-hole installation, which cannot be comprehensively evaluated. Therefore, a more rigorous method is needed to measure whether the body installation points meet the requirements
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Embodiment Construction
[0034] Refer to the attached Figure 1-6 And embodiment the present invention is described in detail:
[0035] This embodiment discloses a method for testing the dynamic stiffness of an attachment point of a vehicle body, comprising the following steps:
[0036] S1. If figure 1 As shown, a three-way sensor 3 is installed at the attachment point through a tooling 5 or a fastener, and the three-way sensor 3 is connected to the LMS test system; in the figure, 1 is the first attachment point, and 2 is the second attachment point. Note, the three-way acceleration sensor must meet the following requirements: ①, the sensor has no resonance in the tested frequency band, ②, the sensor is lighter than 10g, ③, the sensor size is less than 1cm×1cm×1cm;
[0037] S2. Hit the hammer excitation point 4 next to the attachment point of the vehicle body with a force hammer, and transmit the data collected by the three-way sensor 3 to the LMS test system to obtain the dynamic stiffness function...
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The invention relates to a dynamic stiffness evaluation and test method for vehicle body attachment points. The method can be used for dynamic stiffness analysis of various vehicle body attachment points, and comprises the following steps: S1, installing a three-way sensor at an attachment point through a tool piece or a fastener, wherein the three-way sensor is connected with an LMS testing system; 2, knocking a force hammer excitation point beside the attachment point of the vehicle body through a force hammer, and transmitting data acquired by the three-way sensor to the LMS testing system to obtain a dynamic stiffness function curve k1 at each attachment point; S3, repeatedly performing the step S1 and the step S2 until the dynamic stiffness function curves k1, k2... of all the n vehicle body attachment points are obtained; and S4, obtaining the comprehensive dynamic stiffness function of each attachment point through the following formula defined in the specification. According to the invention, the comprehensive dynamic stiffness of a plurality of vehicle body attachment points is converted into an extremely simple calculation formula, and the comprehensive dynamic stiffness is obtained through simple testing.
Description
technical field [0001] The invention relates to a method for evaluating and testing the dynamic stiffness of an attachment point of a vehicle body, which can be used for analyzing the dynamic stiffness of various attachment points of the vehicle body, reflects the strength of the attachment point of the vehicle body from objective data, and belongs to the field of automobile vibration and noise control (NVH) . Background technique [0002] As the body structure becomes more and more complex, more and more accessories are installed on the body end, and there are more and more attachment points on the body end. Dynamic stiffness refers to the ability of the structure to resist deformation under specific dynamic disturbances. If the jog stiffness of the body end attachment is not strictly controlled, it will have a huge impact on the vibration and noise inside the car, and it will have a great impact on the body end attachment jog stiffness. Analysis and optimization have very...
Claims
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IPC IPC(8): G01M5/00G01M17/007
CPCG01M5/0066G01M5/0075G01M17/007
Inventor 殷和顺钟秤平黄超勇
Owner JIANGLING MOTORS