In this research, a new passive-type integrated quasi-zero stiffness isolator with variable cross-section (IQZS-VCS) characteristic is proposed in order to extend the application fields. Compared with the integrated quasi-zero stiffness isolator with uniform cross-section (IQZS-UCS), the IQZS-VCS isolator has more adjustable structural parameters and can enhance vibration attenuation performance in lower-frequency region. Based on the developed static model, the nonlinear force and nonlinear stiffness characteristics of the IQZS-VCS isolator are evaluated using different design parameters. Furthermore, the effects of different factors on vibration reduction ability of the isolating system are addressed in terms of amplitude-frequency response and force transmissibility. Compared with a traditional linear, IQZS-UCS and conventional three-spring-type quasi-zero stiffness isolators, the proposed isolator exhibits better low-frequency and wide-band isolation performance. Quasi-static and electromagnetic exciting tests reveal that the developed theoretical models and related calculation results of the IQZS-VCS isolator are correct, providing an innovative solution and insight for broadband isolator.

The dynamic performance of an integrated quasi-zero stiffness (IQZS) isolator which is constructed by a single elastic structure is investigated in this study. This prototype exhibits the characteristics of the best simplicity, high reliability, and without friction by using the minimum number of elements. For completeness, the static properties of the IQZS isolator are provided at first. And then, the dynamic behavior is analyzed and the frequency response under harmonic excitation is derived by using an equivalent mechanical model. Frequency response curves (FRCs) under force excitation condition are obtained by using the harmonic balance method (HBM). Moreover, the dynamic performance of the nonlinear isolator supporting a lumped mass is investigated, and the vibration isolation performance is evaluated by utilizing force transmissibility and comparing with an equivalent linear system with the same design parameter setting. It can be concluded that the effective isolation range of the nonlinear isolator is broader than the linear counterpart. The effects of system parameters on the transmissibility are also examined. At last, the comparison between the analytical and experimental results under force excitation shows that the analytical model of the IQZS isolator is accurate in terms of force transmissibility. The calculation results may provide a theoretical basis for designing this class of IQZS isolator in engineering practice.

In order to improve the quality of crankshaft machining,studied follow the machining accuracy of crankshaft grinding and established grinding motion mathematical model.Taking certain types double wheel servo CNC crankshaft grinder of a machine tool plant production as the research object,through analysis of the motion relationship between the movements of body,it got motion errors of the machine tool.Based on the theory of multi-body system kinematics,the whole machine tool motion model is established.It made arbitrary cutting point by "bed-artifact" kinematic chain and "bed-tool" kinematic chain to describe position matrix.By using the superposition principle of tool path and cutter route,it established precision processing constraint equations of double wheel servo grinder.It established coordinate the movements of the body,and found out the transformation matrix between the movements of body.It obtained precision machining constraint equation of double wheel servo CNC crankshaft grinder by using MATLAB matrix product,and laid the foundation for the machine error compensation.

This paper present on an new error identification approach on B rotary axe geometric error for a non-orthogonal five-axe CNC machine tool research is not enough in the domestic and abroad, establish the motion error model of non-orthogonal five-axe CNC machine tool based on the multi-body system theory (MBS), there are total 12 static errors and dynamic errors in this model. Design eight different measurement method to measure 12 errors. Finally realizing 12 errors identification of the B rotary axe by combine measurement results. This approach can be used for the rotary axe error identification of five-axe CNC machine tool and the measurement results are accurate after test verification.

In order to improve the compound machining accuracy of NC machine tools,studies the geometric error modeling and sensitivity analysis method.Use CHD-25 type 9-axis 5 linkage turning-milling compound NC machine tool as a research object,this paper introduces the geometric error modeling method of the machine tool based on the multi-body system kinematics theory.The model involves 37 items of geometrical errors.By calculating and analyzing the error sensitivity coefficient,the key geometric errors that affect the machining precision are identified finally,which provides an effective theoretical basis for the design of compound CNC machine tools.

As a result of the limitation of testing environment area and testing equipment, the existing the rigid structure of the feeding device or multistage hydraulic cylinder cantilever mechanism can't meet the requirement of the stiffness. A scale is developed relatively high stiffness and high cantilever mechanism composed of five box, box at all levels adopt i-steel design, to enhance the rigidity and stability. Driven by a rope between housing at all levels, at the same time, to ensure the position precision. Using the finite element analysis ANSYS platform the cantilever mechanism, validate the rationality of the design. At the same time design of endoscopic detection device charge electric control system, and the control program is based on Vc++ to develop software. This set of equipment has been successfully applied on the inner wall of the column, detection of industrial field, has obtained the good effect.

以某型号的凸轮轴磨床为研究对象,基于ANSYS Workbench对床身的动静态性能进行分析,获得床身的动静态特性参数.根据床身的应力云图、变形云图和振型云图可分析出床身的动静态特性参数均符合设计要求.最后进行实验模态分析,分析结果与有限元分析之间的最大误差为7.94Hz,验证了有限元分析结果的正确性,为床身优化设计以及轻量化研究奠定了基础.

CNC grinding machine is the most commonly used finishing machine, lathe bed is the foundation of the machine tool key parts, as well as the guarantee for the machine tool dynamic stiffness. Taking a CNC grinding machine lathe bed as the research object, using Pro/E software to create the geometry model, and using finite element software ANSYS Workbench of simplified lathe bed for modal analysis. Through the modal analysis and find out the weak link of lathe bed and resonant frequency. In order to improve the dynamic characteristic of lathe bed, without changing job characteristics and difficult processing conditions, puts forward several improvement program, again on the proposed solution to the modal analysis. By contrast, determine the optimal structure of lathe bed improved scheme, for the structure design of lathe bed provides a theoretical basis.

Aims at AOCMT type five-axis ultra-precision CNC machine tool, the rotary axis geometric errors model is established by applying the homogeneous coordinate transformation matrix, a kind of errors measurement and identification method is put forward. It takes A axis as an example, using the function of RTCP to control a rotary axis and two translational axes synchronous movement. Different height and positions are designed, and the modes of the measurement are the axial, radial and tangential. The length variations are acquired, and the relational expressions of deviations and length variations are derived according to the errors model. Eight deviations related to A axis can be identified at the same time. The method is available through the simulation.