To more accurately learn reliability on anti-overturning stability for a truck crane, a parametric multi-body dynamics model is built in a dynamic software environment with overall key parameters as design variables. On this basis, stability criteria of this truck crane are established according to the working conditions and crane dynamics simulation results. After a truncated normal distribution sampling method is given for design variables which will effect on truck crane's stability, the reliability analysis of this truck crane is done via Monte Carlo method. The result indicates that the truck crane's stability reliability is 0.9998 in the most dangerous working condition. Analysis shows that the reliability calculation of truck crane anti-overturning stability is feasible using modern multi-body dynamics and Monte Carlo method, and the results are more accurate than conventional safety factor method.

The dynamic characteristics of the grinding machines have an impact on its machining quality and cutting efficiency. In this paper, through the analysis of the structural features of the Large CNC gantry surface grinding machine, the finite element model of structure of the grinder was established on the base of the simplified machine structure, on which carried out its dynamics analysis, obtaining the modal parameters of the orders under different mode shapes. The effect on the dynamic characteristics of machine tools was analyzed under different mode shapes, then the weak link of the surface grinding machine was given, and then how to improve the structural design weakness of surface grinding machine was discussed, all of which provided theoretical basis for improvemental design for the structure of the large CNC gantry surface grinding machine.

The objective of the study is to improve the impact resistant performance of a special vehicle’s front sliding plate. For this, a performance evaluation indicator called critical failure velocity is proposed in this paper. By regarding the impact velocity as the variable, this paper carried out a numerical simulation of the changeable stress and deformation due to the impact on the different front sliding plates which are made by aluminium alloy, high strength steel and special engineering plastics by ABAQUS／Expticit. In this way, the relationship between various impact velocities and maximum Mises stress on the front sliding plate can be got, and the critical failure velocities can be found through the relationship. Then, as a comparative analysis of various materials’ critical failure velocities has been made in this paper, the front sliding plate’s impact resistant design

Performance test rig of the electric nail gun consists of five partsand the key one of which is the loading mechanism. By analyzing its working principle, virtual prototype model of the loading mechanism was established using simulation software ADAMS. Through simulation of the prototype model, the design requirements of the loading mechanism were given. Then, using the method of parametric analysis, dynamic characteristics of loading mechanism was obtained. Eventually, the relationship between the preload force of loading spring and the implanted force of the sample nail was presented.

This paper introduces a method of manufacturing process of resin concrete, made three tubular cast-iron specimens filled with resin concrete. This paper detected the amplitude-frequency response curve of specimens in experimental method, and calculated the damping ratio of specimens through half power bandwidth method. The damping ratio of specimens is compared. It provided a good reference for the design of the machine tool on the dynamic characteristics.