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Estimation Method of Body Mount Dynamic Stiffness Based on Mobile Multilevel Bandwidth Estimation Model

A technology of bandwidth estimation and dynamic stiffness, applied in the field of dynamic stiffness estimation, to achieve the effect of reducing the number, strong engineering applicability, and strong application prospects

Inactive Publication Date: 2017-07-18
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

[0009] Aiming at the above-mentioned deficiencies in the prior art, the present invention proposes a method for estimating the dynamic stiffness of the mount based on a mobile multi-level bandwidth estimation model. It solves the problem of too many fitting parameters of the model, improves the accuracy and efficiency of dynamic stiffness estimation, and lays the foundation for accurate analysis of the transmission path of mechanical system vibration and noise

Method used

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  • Estimation Method of Body Mount Dynamic Stiffness Based on Mobile Multilevel Bandwidth Estimation Model
  • Estimation Method of Body Mount Dynamic Stiffness Based on Mobile Multilevel Bandwidth Estimation Model
  • Estimation Method of Body Mount Dynamic Stiffness Based on Mobile Multilevel Bandwidth Estimation Model

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Embodiment 1

[0037] Such as figure 1 and Figure 4 As shown, this embodiment includes the following steps:

[0038] Step 1. Determine the parameters of the multi-level bandwidth estimation model for the engine mount movement: the engine system has three mounts: left mount, right mount and rear mount. Each mount only considers the dynamic stiffness in the translational direction (X, Y, Z three directions), so there are 9 dynamic stiffnesses of transmission paths, the analysis frequency range is 10‐190Hz, and 10 order slice data are used. According to the empirical formula of the mobile multi-stage bandwidth estimation model: n=9, m=10, fr=191Hz, bw=32Hz, Δf=4Hz, and the implementation condition can be satisfied when the number of reference points is 1, that is, v=1.

[0039] Establish a transfer path analysis model, such as figure 2 shown.

[0040] Step 2. Measure the operating condition response and transfer function:

[0041] 2.1) Under working conditions, measure on the vehicle bod...

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Abstract

A movable multistage bandwidth estimation model-based vehicle body suspension dynamic stiffness estimation method. Directing at the defect that a suspension dynamic stiffness test is high in cost, long in period and cannot obtain dynamic stiffness under a relatively high frequency and the problem that too many fitting parameters exist in an existing suspension stiffness estimation model, through a method of combining a movable multistage bandwidth estimation model and a nondeterminacy index, a determinate suspension dynamic stiffness estimation process is converted to an indeterminate suspension dynamic stiffness estimation process, and a loop iteration solving method is adopted to estimate suspension dynamic stiffness. The obstacle that suspension dynamic stiffness under a relatively high frequency cannot be directly obtained by experiment means is overcome, the problem of too many fitting parameters is solved at the same time, accuracy and efficiency of suspension stiffness estimation are improved, and estimated accuracy of dynamic stiffness is described quantificationally, thereby laying a foundation for precisely analyzing a transmission path of vibration noise of a mechanical system.

Description

technical field [0001] The invention relates to a method for estimating the dynamic stiffness of a car body NVH (noise, vibration and harshness) technical field, in particular to a method for estimating the dynamic stiffness of a body mount based on a moving multi-stage bandwidth estimation model. Background technique [0002] Mounts are widely used in mechanical systems such as automobiles and ships, such as powertrain mounts, rubber bushes and exhaust pipe suspensions, which mainly play the role of support, vibration reduction and noise reduction, and the dynamic stiffness characteristics of the mounts are It is the main index to evaluate its ability to isolate vibration. [0003] According to the connection stiffness between mechanical systems, the systems are usually divided into two cases. The connection stiffness of the first system is relatively large or rigidly connected, which cannot be decomposed into smaller subsystems as a whole. The connection stiffness of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B13/04
Inventor 朱平王增伟赵建轩金雪
Owner SHANGHAI JIAO TONG UNIV
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