Advanced Materials Research Vols. 317-319

Abstract: Holding the work piece for the forging press is the main task of the forging manipulator, and it is recognized as one of industry’s most arduous tasks. To ensure the safety of the manipulator mechanism, the resistance force exerted on the clamp must be minimized [1]. This paper focuses on the vertical load analysis of lifting systems for the forging manipulator when it works in cooperation with the forging press. First the equivalent stiffness model of the work piece is presented and the loads of the lifting systems are derived. Then the hydraulic circuits of the front and the rear lifting systems are investigated. Finally, the whole forging process is analyzed to study the relationship between the tracking error of the lifting systems and the resistance force on them. Simulation of one typical forging process shows that the cause of resistance force on the lifting system is the displacement tracking error.

Abstract: With the development of civil aircraft engine health mangement system, the research of content of Health Management Technology for Civil Airplane is listed in schedule. This paper takes the advantage of the experience of abroad’s Health Management Technology for Civil Airplane and puts the content of the research of Health Management into detail.This paper also summarizes the critical technology of Health Management.The research above accelerates the development of Health Management Technology for Civil Airplane and shorts the gap between World powers and us.

Abstract: Development of integrated hand-foot function will speed up the practical application of multi-legged robots. If the positions of each foothold, the driven joint variables and length of linkage bar in leg are inaccurate, the arms (swing leg) of the robot are likely to deviate from required positions. In this paper, through the calculation process of the multi-legged walking robot's arm path, we discussed the calculating problem of the arm's position accuracy under the condition that the errors of foothold positions, driven joint variables and leg's linkage bar length are given. Detailed calculation formulas are given, and the analysis process is illustrated by an example.

Abstract: The mechanics behavior between soil and wheel has important influence on the traction performance of the lunar rover. For analyzing the interaction between soil and wheel, the mechanical model is established and the experiment devices adopting gas bearing and tracking mechanism are set up in this paper. The relation of wheel structure, soil parameters, load, slip rate, traction force of the wheel is analyzed. Some experiments are done to test the mechanical property and the effect of slip angle, slip rate and soil parameters on the traction performance of the rover. The results prove the validity of the theoretical model.

Abstract: The three-Dimensional model of 40BZ6-15 centrifugal pump is built by the Solidworks software. This paper employs three-D Navier-Stokes equation and standard equation, and uses MRF and STMPLE algorithm to simulate the internal flowing of the 40BZ6 centrifugal pump. The velocity field and pressure field are gained. Through a further analysis, the rule of the internal flow of the centrifugal pump is unveiled, and then the simulative results are compared with the experimental ones, which can provide the base for the further improvement of the centrifugal pump.

Abstract: The paper addresses the multi-objective optimization of a 2-DoF purely translational parallel manipulator. The kinematic analysis of the Proposed T2 parallel robot is introduced briefly. The objective functions are optimized simultaneously to improve Regular workspace Share (RWS) and Global Conditioning Index (GCI). A Multi-Objective Evolution Algorithm (MOEA) based on the Control Elitist Non-dominated Sorting Genetic Algorithm (controlled ENSGA-II) is used to find the Pareto front. The optimization results show that this method is efficient. The parallel manipulator prototype is also exhibited here.

Abstract: This paper utilizes position errors, position error rates and payload variations as inner feedback loops for controlling the actuators of joint rotations in a pneumatic artificial muscle (PAM) driven robot. The result is an algorithm that is able to adaptively regulate input signals for the proportional pressure valve that controls the air flow to the PAM, in an attempt to better mimic the point-to-point movement of human arm. Further, the algorithm is able to utilize the angular position information from an outer feedback loop to activate/deactivate a solenoid valve for a rapid damping of the non-oscillatory motion and thereby, able to quickly and accurately bring the joints to a rest at a desired position. The proposed method appears to be effective in overcoming some of the inherent drawbacks that arise from the viscoelastic shell and air compressibility of the PAM element.

Abstract: The NND scheme based on Van Leer flux vector splitting is presented. The flow field of shock wave tube is calculated by the difference method presented in this paper, which shows that the presented finite difference method has fine calculation precision and efficiency, and could capture shock automatically.

Abstract: In this paper, the structure and the motion state of a new type multi-legged walking robot with hand-foot-integration function is introduced, and its swing leg which has hand-foot-integration function is analyzed in detail. Firstly, the kinematics relation of the swing leg is researched, then the velocity and accelerated velocity expression of the swing leg is derived. And then, the dynamics of the swing leg in the state of grasping objects with considering the gravity effect is researched by using Newton-Euler method. The relevant formula is deduced in this paper. Finally, the analysis process is verified through a numerical example.

Abstract: The development of multi-component blending yarn enlarging the fiber sources, improving performance of yarns, making yarns functional, enhancing the look and feel of the yarn, so it was developed rapidly. However, different fiber component differs in morphology and performance, which making the control of the spinning process and yarn quality difficult, the main problems in developing multi-component blending yarn, i.e. the choice of fiber, blending ways, the choice of the blending ratio, the spinning ways, spinning process, are summarized here, which became the technical base of the production of multi-component blending yarn of high quality.