Mechanical Science and Technology 

About: Mechanical Science and Technology is an academic journal. The journal publishes majorly in the area(s): Finite element method & Fuzzy logic. Over the lifetime, 675 publications have been published receiving 1298 citations.

A Novel Spatial Four DOF Parallel Mechanism and Its Position Analysis

Abstract: A novel model of a 4 DOF parallel manipulator is presented. The degree of freedom and the characteristics of the mechanism model are discussed. The solutions are developed for both the inverse and forward kinematics. The inverse kinematics produces two solutions for each leg of the manipulator. The forward kinematics is reduced to a eighth order polynomial equation. Some numerical examples for the position kinematics are presented finally.

Mechanical Reliability Design with Fuzzy and Random Stress

Abstract: The paper discusses the method to imitate the failure probability of machine parts by means of the method of random imitation in general reliability design while stress is fuzzy and random because of fuzzy information in the process of mechanical design. It is demonstrated that the result of general reliability design may be different from that of engineering practice because fuzzy information is not taken into consideration, and that the result may conform to engineering practice when both random and fuzzy information is taken into consideration.

Experimental Study of the Influence of Processing Parameters on Forming Quality of Thin-Walled NC Bending Tube

Abstract: The influence of processing parameters on wrinkling, cracking, spring-back and deformation of thin-walled NC bending tube is studied by experimentation. The major reason for the extension length of mandrel influencing wrinkle and crack of tube is deeply analyzed, and the calculation formula of the most reasonable extension length of mandrel is deduced and proved. At the same time, the effects of angularity on spring-back angle and deformation of cross-section are researched, and the conclusion of the linear relationship between angularity and spring-back angle is obtained.

Stress-analysis of a Complex Structure with the ANSYS System

Abstract: Finite element modeling (FEM) of a complex structure is a time consuming work for engineering calculation process. Even though some advanced software systems provide many modeling facilities, a good model still strongly depends on the skill of analyzers. Therefore, this paper presents some modeling skill and experiences in the application of the large scale commercial software ANSYS 5.7 to model a complex joint structure typical to engineering analysis. In section 2, a six step procedure for building FEM with APDL language is proposed, and more details and different modeling methods to simulate a bolt connection are studied.

Dynamic Modeling of Multi-Flexible System--Theory and Application

Abstract: In dynamic analyses of a mechanical system, it is often abstracted as a centralized mass spring damper system, or every part in the system is regarded as a rigid body. However, if some parts deform obviously and their deformation must be taken into consideration, the mechanical system must be modeled as a multi flexible body. In this paper, the flexible body modeling theory is demonstrated firstly. Then, an example of modeling a kind of automobile's front suspension as a multi flexible system is shown. Finally, it is shown that the simulation results of multi flexible dynamic model agree with the road test data more than those of multi rigid dynamic model do. Thus, it is fully testified that using multi flexible body theory to model is necessary and effective.