Advanced Materials Research Vols. 834-836

Abstract: In this paper, an engineering drawing retrieval method based on spherical harmonics is proposed. Firstly, the sample points are uniformly generated by computing the interaction points between the rays and the engineering drawing. Secondly, the sampled points are transformed from the 2D space into the 3D space to get the spherical harmonics shape descriptors. Finally, the Euclidean distance is adopted to compute the distance between the two feature vectors, which can give the similarity coefficient for two compared engineering drawings. Experimental results show that the proposed method is good at retrieving engineering drawings and the retrieval performance can meet the requirement of the practical retrieval.

Abstract: The bolted joint is the important fastening parts of structures. Its fatigue and self-loosing will affect the safety of the system. In this paper, the finite element contact models are built to analyze the mechanical property of bolted joint numerically. The stress, strain and clamping force when the bolted joint is subjected to preload, axial force and transverse load are investigated. The results show that the bolt is the most dangerous part of bolt-nut connected member. The clamping force of bolted joint will gradually lose with the increasing loading cycles of cyclic transverse load which generally explains the stress loosing rule of bolted joint.

Abstract: The detail analysis proposal of the cylinder body is put forward for the automatic tool change mechanism of the QYJ-21 type horizontal machining center. It consists of three main aspects. Firstly, the dimensional model of the cylinders arm bracket portion will be created. Secondly, the topology optimization design of the arm bracket is implemented based on ANSYS Workbench. Finally, meeting the stiffness requirements, the optimal topology shape will be established, for it had the lightest weight.

Abstract: The rack always gets deformation in torsion after hobbing, it effects machining accuracy and performance. This paper is proposed to analyze the reason of deformation, combined with a series of technical requirements, furthermore rack-torsional hydraulic straightening machine is designed and researched. By using Simulation module in Solidworks to complete finite element analysis of key components, so the expected design requirements of the system can be ensured.

Abstract: Multi-planetary gear transmission is usually used in construction equipment, metallurgical machinery and wind-driven generator. Driving mechanism of heavy-duty equipment without even-loading system is badly loading, resulting in great impact force and severe vibration. To study characteristic of power dividing, multi-planetary gear transmission without any even-loading mechanism and that with flexible pin even-loading mechanism were simulated in commercial gear drive design software and dynamics analysis software. The simulation results are shown in this paper and conclusions are drawn useful for design and manufacture of heavy-duty multi-planetary gear transmission.

Abstract: The dynamic simulation and analysis of NGW planetary gear train was researched in this paper. The working types of NGW planetary gear train were discussed and the applying of boundaries and loads were established. Then the assembly models were established in ANSYS and a dynamic simulation was performed. Finally 5 groups of NGW parameters were taken to carry out a dynamic analysis. The results obtained by FEM were compared with those calculated by traditional method. The simulation results show that the gaps between FEM and traditional method are stable. The research provides a reference for the strength checking and design of NGW planetary gear train.

Abstract: To ensure the safe use of L-type deflection machine for processing and manufacturing railway vehicles. This paper analyzes the use conditions of L-type deflection machine, and makes a contact nonlinear finite element analysis on various typical use conditions. The positions of parts subject to danger can be found out through the results of static strength analysis, which finds out the weaknesses and prejudges the failure trend of parts, and which provides guidance for prejudging the faults in actual production and can prevent occurrence of accidents.

Abstract: The dynamic characteristic of junction surface is an important part of the dynamic characteristics of NC machine tools, and it is sometimes the weakest link of the machine tool's dynamic characteristics. The precision of the finite element calculation of the machine tool's dynamic characteristics shall be affected by the junction surface parameters directly. Linear Motion guide is one of the most widely used components of the NC machine tool, and its characteristic is one of the most important components of the performances of the NC machine tool. The HSR series of linear motion guides are taken as the object of the paper, and its static and dynamic characteristics are studied. And the parameters of static and dynamic characteristics of HSR, such as static stiffness, natural frequency and modal shape are obtained. The accuracy of the finite element analysis mode is verified, which establishes the foundation for the dynamics analysis of machine tool.

Abstract: The 3-D model is established and is meshed. Then the inner flow field of the poppet valve is simulated at different cone diameter E, different opening positions. Analyzing the result of simulation, the variation curves of cone resistance and steady flow force in different opening of different structure parameters can be obtained. This study for the valve offers the significant reference for designing the valve and optimizing its performance.

Abstract: In this paper, electromagnetic dynamic characteristics of suspension system of middle-low speed maglev train are analyzed with finite element analysis (FEA) method based on the high-performance computing platform (HPC). The couple structure between F-type track and suspension magnet is meshed by pretension element. The dynamic characteristics of suspension system are simulated in three-dimensional model with 4 degrees of freedom motions condition. Both the numerical simulations and the actual force tests of suspension system are carried out with the same input. The result shows that the calculation accuracy of finite element analysis is high.