Experimental Study Of The Dynamic Characteristics Of The Machine Fixed Combination Of Surface Parameters

The study of this thesis is based on the research of "High grade CNC machine tool and basic manufacturing equipment".The research aims to build the joint characteristic parameter library and implove the machine tool's dynamic design of precision.A systematic research on dynamic characteristic parameter of fixed joint's identification is done in this paper.The measurement model of fixed joint is developed by eliminating the influence of base displacement.By selecting proper modal instruments and excitation signal, the real-time measurement platform of multi-channel is built to implove precision of joint parameter identification. The design requirements are considered in the design scheme, such as vibration stability, stiffness, generality. The validation of important component is done by finite element analysis.The experimental scheme is designed through analysis of fixed joint's main influencing factors. In order to specify fixed joint stiffness and damping coefficient identification process, the modal software settings before measurement and the system's mode shape inspection, as well as the data processing of MATLAB is discussed.In addion, the effect of screws is removed.in the unit area characteristic parameter conversion.Different factors such as normal pressure, surface roughness, materials and media of joint which have an influence on fixed joint dynamic stiffness and damping is dicussed by by collating the experimental data.The fixed joints in the test requirement of rolling guide is analyzied by using experimental data in ANSYS. In addion, the finite element analysis result and experimental result is compared, which confirms the validation of experimental data obtained.