Dynamic Optimization of Constrained Layer Damping Structure for the Headstock of Machine Tools with Modal Strain Energy Method

Abstract

Dynamic stiffness and damping of the headstock, which is a critical component of precision horizontal machining center, are two main factors that influence machining accuracy and surface finish quality. Constrained Layer Damping (CLD) structure is proved to be effective in raising damping capacity for the thin plate and shell structures. In this paper, one kind of high damping material is utilized on the headstock to improve damping capacity. The dynamic characteristic of the hybrid headstock is investigated analytically and experimentally. The results demonstrate that the resonant response amplitudes of the headstock with damping material can decrease significantly compared to original cast structure. To obtain the optimal configuration of damping material, a topology optimization method based on the Evolutionary Structural Optimization (ESO) is implemented. Modal Strain Energy (MSE) method is employed to analyze the damping and to derive the sensitivity of the modal loss factor. The optimization results indicate that the added weight of damping material decreases by 50%; meanwhile the first two orders of modal loss factor decrease by less than 23.5% compared to the original structure.

Investigation of stability in internal turning using a boring bar with a passive constrained layer damping

“…The diameter of the base material used for the analysis is 20mm. The general methods such as the direct frequency response, complex eigenvalue and modal strain energy (MSE) approaches are popularly used to analyse the dynamic behaviour of composite structures [40]. The first two approaches compute the parameters in the complex domain.…”

Analysis and Optimization of Damping Properties of Constrained Layer Damping Structures with Multilayers

“…e design variables were the number of layers, the layer constituent materials, the orientation angles, and the VEM layer thickness. e topology optimization method was also implemented to achieve the optimal configuration of the damping material of CLD structures [19]. A hierarchical optimization strategy was proposed to optimally design the VEM layer for minimizing the sound radiation power in the literature [20].…”

“…e finite element software such as ANSYS, NASTRAN, COMSOL, and LUSAS is a very efficient tool for solving complex problems in the field of design engineering and has been employed to analyze the dynamic and static characteristics of CLD structures [1,2,5,19,[22][23][24]. However, the optimal designs of CLD structures using finite element software are few.…”

Vibration Damping Design and Testing Research of Space Payload Cabinet

“…Since the design of large and medium fixture is generally applied in aviation and military fields, there is little discussion about its design theory, while there is no systematic theory and method. With the development of modern structural dynamic design method, the combination of finite element modal analysis and vibration test used in the design of fixture will be a fast, efficient and meet the design method of engineering precision (Zheng & Chang, 2006;Xu, Gao, Yu, & Zhang, 2017).…”