Abstract
Mechanical assembly is an important process in manufacturing electromechanical products and it directly affects the dynamic quality of a whole product. The traditional inspection and analysis of mechanical assembly quality mainly focuses on the “static quality”, such as the shape accuracy and dimensional coordination, while ignoring its “dynamic quality”, which is incomplete estimation on the assembly quality. Meanwhile, the assembly coupling dynamic stiffness is a key determinant of the dynamic quality of mechanical assembly. To overcome test operation difficulties in practical application which is caused by the direct scheme of inverse substructuring of the mechanical assembly coupling dynamic stiffness, it needs to discrete the non-ideal mechanical assembly connection interface including linear and planar connection interface so as to apply two kinds of indirect method of inverse substructuring analysis based on frequency response function (FRF) spectrum to recognize its coupling dynamic stiffness. The experimental models of mechanical assembly for the more practical linear and planar connections are designed, and the practicability of applying these two methods to recognize the dynamic stiffness after assembly coupled is verified.
Highlights
Complicated mechatronic products are normally combined by assembling a series of units or members according to devise requirements
In order to obtain the assembly coupling dynamic stiffness matrix K of the two experimental models that is computed by the two indirect schemes respectively, this paper measured all the entries of the 9 frequency response function (FRF)-matrices involved in Eq (3) and Eq (4) respectively in the above nine cases of “point-to-point connections” on the two mechanical assembly experimental models
The coupling dynamic stiffness of model is calculated by the scheme using the FRF-matrices tested obtained from vibration excitation experiment
Summary
Complicated mechatronic products are normally combined by assembling a series of units or members according to devise requirements. The quality inspection of mechanical assembly is an indispensable quality assurance link in the manufacture of complex electro-mechanical products. The normal quality inspection of mechanical assembly mainly focuses on the ‘static quality’ indicators such as tolerance and dimensional coordination [1, 2]. The dynamic quality of products, such as vibration, noise and stability, is an important factor that cannot be ignored. The dynamic performance of assembly interface or its coupling connection structure (piece) play a key part in the dynamic quality of mechanical assembly. The identification of dynamic performance or dynamic stiffness of mechanical structural joint components based on frequency response function (FRF) have been widely concerned, and there are some reports about it. In view of the difficulties in modeling the dynamic feature of structural joints by abstract and pure theory analysis, Damjan and Miha [4] have established the dynamic compliance of the beam structure by bolt connection
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