Analysis of Mechanical Characteristics of a Mechanical Reusable Hold-down and Release Mechanism

doi:10.3901/JME.2021.01.040

Abstract

Abstract: Aiming at the requirement of reliable locking in launching process, unlocking to move and relocking on orbit of the load, a mechanical and reusable hold-down and release mechanism driven by load is proposed. The mechanical characteristics of the mechanism are analyzed. The mechanical model of the mechanism is constructed, the relationship between the unlocking force and the spring preload is established. Based on Hertz contact theory and elastic-plastic deformation theory, an elastic-plastic contact model of locking hook and hold-down foot is proposed, the load range of elastic deformation and plastic deformation of the two parts in the compression area is analyzed. The finite element model of the hold-down and release mechanism is established by using the finite element method, the modal, sinusoidal vibration and random vibration characteristics are simulated and analyzed, the vibration characteristics of the mechanism and the dynamic contact load under the impact load are obtained. At the same time, the ground system level vibration and impact tests of the mechanism are carried out. The results of simulation and test show that the designed mechanism works reliably and has good dynamic characteristics, which can be applied to the occasions of repeated compression and release of aerospace products in high impact.

Key words: mechanical, reusable, hold-down and release mechanism, dynamic characteristics

CLC Number:

TG156

QIN Junjie, YANG Shuai, HE Nan, SHI Zhifeng, LI Xing, LAI Xiaoming, MO Guidong. Analysis of Mechanical Characteristics of a Mechanical Reusable Hold-down and Release Mechanism[J]. Journal of Mechanical Engineering, 2021, 57(1): 40-48.

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