Quick design optimization method of power assembly suspension decoupling

Abstract

The invention puts forward a quick design optimization method of power assembly suspension decoupling. MATLAB (matrix laboratory) programming and a computing platform are adopted to realize the computation of the modal frequency and the decoupling rate of a power assembly six-degree-of-freedom rigid body; on the premise that a plurality of targets are fully considered, a modal frequency target model, a modal decoupling target model and a suspension rigidity manufacture target model are established; and finally, a target function is defined and optimized, and meanwhile, the installation position, the rigidity and the installation angle of a suspension system can be subjected to optimal design. The quick design optimization method does not depend on traditional commercial software, analyzes the power assembly suspension decoupling and greatly improves analysis efficiency. In addition, the quick design optimization method fully considers the installation position, the rigidity and the installation angle in a suspension optimization design process, enriches an optimal design variable, and provides rich solving resources for the power assembly design of a finished automobile concept design stage. Meanwhile, frequency avoidance and suspension manufacture constraints in a design process are considered, and the mismatching of a later period power assembly under the working situation of the finished automobile is avoided.

Description

technical field [0001] The invention belongs to the technical field of vehicle NVH, and relates to the decoupling design technology of power assembly mounts. Background technique [0002] Comfort is one of the main performance indicators of automobiles, and the vibration transmission characteristics of the powertrain suspension system play an important role in the comfort of automobiles. The primary task of the powertrain suspension system is to isolate the vibration of the powertrain from being transmitted to the frame, body and cabin, especially to control the low-frequency vibration of the powertrain under idling conditions, and to isolate the vibration caused by the high-speed operation of the powertrain. Noise in the car. For a long time, designing a powertrain suspension system with good performance and improving the comfort of the vehicle has always been an important topic of concern to automotive researchers and design engineers. [0003] Due to the kinematic coupl...

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Problems solved by technology

[0004] At present, most domestic vehicle units use commercial analysis software for powertrain mount decoupling, such as ADAMS, Nastran, etc. Although these analysis software have high solution accuracy, the analysis time is relatively long. If The time cost is high for optimization; in addition, most of these mount decoupling analysis software cannot simultaneously support the mixed optimization design of multiple variables such as mount installation position, stiffness, and installation angle

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