Method for processing nonlinear stiffness data of suspension systems of power assemblies of automobiles

An automotive powertrain and mounting system technology, which is applied in electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as large calculation workload, achieve simple operation, simple design, and reduce design calculation workload. Effect

Active Publication Date: 2014-02-12

TONGJI UNIV

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In the process of designing the nonlinear stiffness of the powertrain mount, the working conditions of different elastic principal axes are different, and the corresponding limit requirements are also different. T...

Abstract

The invention relates to a method for processing nonlinear stiffness data of suspension systems of power assemblies of automobiles. The method includes steps of 1), enabling a data input module to input suspension static stiffness data, suspension static force data of the power assemblies, maximum displacement data of compression directions under extreme working conditions and maximum displacement data of stretching directions under the extreme working conditions into a data processing module; 2), enabling the data processing module to determine static points; 3), enabling the data processing module to adjust correction parameters of the compression directions and correction parameters of the stretching directions until nonlinear stiffness curve data meeting limit requirements of the extreme working conditions are obtained; 4), enabling the data processing module to output expressions of nonlinear stiffness curves to a data output module; 5), utilizing data of the expressions of the nonlinear stiffness curves for designing the suspension systems of the power assemblies of the automobiles by the aid of the data output module. Compared with the prior art, the method has the advantages of capability of effectively reducing computation workload, simplicity and convenience in operation, and the like.

Application Domain

Special data processing applications

Technology Topic

Static forcePowertrain +7

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Experimental program(1)

Example Embodiment

[0019] Example

[0020] like figure 1 As shown, a method for processing nonlinear stiffness data of an automobile powertrain suspension system includes the following steps:

[0021] 1) The data input module inputs the static stiffness data of the mount, the static force data of the powertrain mount, the maximum displacement data in the compression direction under extreme conditions, and the maximum displacement data in the tension direction under extreme conditions into the data processing module.

[0022] 2) The data processing module obtains the position of the static point according to the static stiffness data of the mount and the static force data of the powertrain mount. The static stiffness data of the mount is based on the powertrain mass, moment of inertia, suspension The coordinates of the elastic center and the center of mass of the powertrain are set, and the suspension vibration isolation rate, modal decoupling rate, and lateral rotation frequency or longitudinal rotation frequency are calculated as optimization objectives. Stiffness, the slope of the linear segment of the nonlinear stiffness curve changes, as does the position of the static point.

[0023] 3) The data processing module adjusts the correction parameters of the compression direction and the correction parameters of the tension direction respectively according to the maximum displacement data in the compression direction under the extreme working conditions, the maximum displacement in the tension direction under the extreme working conditions and the position of the static point, until it is satisfied The nonlinear stiffness curve data required by limit conditions:

[0024] The relationship between the correction parameters in the compression direction and the nonlinear stiffness curve is as follows: with the increase of the correction coefficient in the compression direction, the slope of the nonlinear section of the nonlinear stiffness curve increases, and the length of the linear section becomes shorter. like figure 2 As shown in Fig. 1, adjusting the correction parameter values reasonably can avoid affecting the vibration isolation performance in the high frequency band due to the too short linear stiffness section. When the correction coefficient is 0.25, the linear stiffness section can meet the design requirements; when the correction coefficient is 0.23, when the load is large, the limit displacement is insufficient, which obviously cannot meet the design requirements; when the correction coefficient is 0.27, the limit displacement can be met. Requirements, but the effective linear stiffness section is short, so that the suspension stiffness of the car enters the nonlinear section when the car is in 4th gear, which is not conducive to high-frequency vibration isolation.

[0025] The relationship between the correction parameters of the stretching direction and the nonlinear stiffness curve is as follows: with the increase of the correction coefficient of the stretching direction, the slope of the nonlinear section of the nonlinear stiffness curve increases, and the length of the linear section becomes shorter. like image 3 As shown, when the correction coefficient is 0.32, the linear stiffness section can meet the design requirements; when the correction coefficient is 0.29, the limit displacement is insufficient when the load is large, which obviously cannot meet the design requirements; when the correction coefficient is 0.35, the It meets the limit requirements, but the effective linear stiffness section is short, which is not conducive to high-frequency vibration isolation.

[0026] 4) The data processing module performs polynomial fitting on the nonlinear stiffness curve data to obtain the expression of the nonlinear stiffness curve: f(x)=a 0 x n +a 1 x n-1 +…+a n-1 x+a n , and transfer this expression to the data output module.

[0027] 5) The data output module outputs the expression data of the nonlinear stiffness curve and uses it in the design of the vehicle powertrain suspension system.

[0028] This method does not require cumbersome calculation work, and only needs to determine the design parameters of the vehicle mount system and the customer's design requirements for the powertrain mount system to adjust and design the nonlinear stiffness of the powertrain mount system. Effectively reduce design calculation workload and accidental errors in the design process, easy to operate, more convenient and accurate design of automotive powertrain suspension system.

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Method for processing nonlinear stiffness data of suspension systems of power assemblies of automobiles

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