Rigid and flexible body hybrid modeling method for locking mechanism

Abstract

The invention provides a rigid and flexible body hybrid modeling method for a locking mechanism, which comprises: separating a simplified geometric model of the locking mechanism according to a 3D model of the locking mechanism, and giving materials and attributes, wherein rigid attributes are given to at least one part and flexible attributes are given to the other part; determining a first rotary axis and a second rotary axis of a lock cylinder in an finite element network model and adjusting the position of the lock cylinder, so that the lock cylinder is in an unlocked state; establishing a kinematic connection unit and an elastic element of each part of the locking mechanism, giving attributes and spring rigidity and adjusting a pretensioning load value; and defining a test working condition, correcting and checking a locking behavior of the locking mechanism and obtaining a final rigid and flexible body hybrid model of the locking mechanism. By implementing the rigid and flexible body hybrid modeling method, the locking behavior of the locking mechanism can be precisely simulated; and the rigid and flexible body hybrid modeling method has high universality and is beneficial to lightweight design of an opening and closing part.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to a rigid-flexible hybrid modeling method of a locking mechanism. Background technique [0002] In the automobile design stage, it is necessary to analyze the closing impact stress of opening and closing parts with locking mechanisms such as doors, hoods, hatchback doors, and armrest boxes. Because there are a large number of installation holes and structural lightening holes on this type of opening and closing parts, a large impact stress will be generated on each component when it is closed vigorously. If the stress is too large, it will lead to structural failure of the structural part. Therefore, the transient stress analysis of the opening and closing parts when they are closed vigorously has become one of the important means to evaluate whether the design of the opening and closing parts is reasonable or not. [0003] In the existing analysis of the impact stress when th...

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Problems solved by technology

[0005] First of all, in this model, the locking point needs to be defined, and the different selection of the locking point will lead to a large difference in stress, so the accuracy of this model is poor, which is not conducive to engineering design;

[0006] Secondly, at the locking point, the kinetic energy of the opening and closing parts is transformed into strain energy too quickly, and the transient stress is very large, which is quite different from the actual situation, so the design of the locking mechanism is usually over-designed, and Not conducive to lightweight design trends

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