A matching method and system for a longitudinal powertrain suspension system

Abstract

The invention discloses a longitudinally arranged power assembling suspension system matching method and system. The longitudinally arranged power assembling suspension system matching method comprises steps of arranging suspension points according to a four-pint suspension system; increasing two auxiliary suspension points with a target of enabling the static bending moment of the rear end surface of a flywheel casing to be equal to zero when the static bending moment of the four points is larger than the maximum bending moment; matching to obtain a rigid body model of a six-point suspension system, if the rigid body model does not satisfy an NVH (Noise Vibration and Harshness) design requirement and matching and acquiring the six-point suspension system within a setting range of a static compression amount under constraint conditions of enabling the static bending moment to be smaller than the maximum static bending moment, the vertical static rigidity of the middle suspension of the six-point suspension to be smaller than that of the rear suspension of the four-point suspension and the rigid body model to satisfy a requirement for the frequency difference in the NVH and with the decoupling rate of Z2 and RX direction being served as a maximum optimization target. The longitudinally arranged power assembling suspension system matching method can guide a designer to achieve matching of the six-point suspension system, reduces requirements for the designer, shortens the development period of the suspension system and saves the testing costs.

Description

technical field [0001] The invention relates to the field of automobile chassis design, in particular to a matching method and system for a vertical powertrain suspension system. Background technique [0002] At present, for example, the longitudinally mounted powertrain suspension system of heavy-duty trucks usually adopts a four-point suspension arrangement, but for powertrains with a large weight and length of the engine gearbox assembly, it usually appears in the actual design. When the actual static bending moment of the rear end of the flywheel housing under the four-point mount is greater than the maximum static bending moment of the rear end of the flywheel housing required by the engine manufacturer, it is necessary to add two auxiliary fulcrums to the gearbox to form a six-point mount system to avoid excessive bending moment on the joint surface between the rear end surface of the engine block and the flywheel housing. The six-point suspension system is a complex ...

AI Technical Summary

Problems solved by technology

The six-point suspension system is a complex vibration system. On the one hand, it must meet the static bending moment requirements of the rear end face of the flywheel housing, and on the other hand, it must also meet the vibration performance requirements. The matching of its stiffness has always been a technical problem. At present, the main The matching method is to repeatedly adjust and check according to the actual design experience until the check result is qualified. This requires the designer to have rich experience in the design of the longitudinal powertrain mount system, otherwise it will be difficult to Get satisfactory matching results

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