Applied Mechanics and Materials Vols. 496-500

Abstract: It is very important for vehicle handling to match right tires. Mechanics characteristic test is done for the different type tire, the mathematical model is set up according to test data. A dynamic model of vehicle is set up to study the effect of tire performance to vehicle handling stability. Vehicle dynamic response is researched on sinusoidal input of the steering wheel angle. Linear fitting of vehicle dynamic response is done in linear region. According to the difference between the simulation value and linear fitting, different tires are rated.

Abstract: Swing movable teeth reducer is a new type of small teeth difference planetary gear transmission. As a new product development technology, virtual prototype technology is a digital design method based on the product simulation model. It is important to carry on the performance simulation of the reducer and seek the optimization design of the products on virtual prototype technology. Based on the study on the principle and structure of the swing movable teeth transmission, it analyzed the motion of the system, carried on the dynamical simulation of the swing movable teeth reducer, which is established on the virtual prototype. At the same time, the paper analyzed the dynamical simulation on the rotational speed and force of the mainly parts.

Abstract: For the particularity of the environment in nuclear industry, this paper puts forward a modularized mechanical arm with postpositional drive. On the basis of structural characteristics and kinematic constraints, the kinematics of robotic arm is analyzed. The D-H method is used for describing the workspace, based on considering the kinematic constraints, the forward kinematics model is achieved. Using an improved search method, the inverse kinematics solution is obtained. Through the simulation on data processing software, the validity of positive kinematics model and inverse kinematic solutions are verified. Finally, the trajectory planning is completed on the three-dimensional modeling platform.

Abstract: As the power source of warship, diesel engine determines the dynamic performance of the whole warship. In this paper, a simulation model of MAN B&W7S80MC low-speed two-stroke marine diesel engine, used by certain warship, is developed. Simulation analysis is carried out based on LMS Imagine.Lab AMESim. The simulation results show that the model has good accuracy and dynamic characteristics, thus the model can simulate for control design, performance analysis and simulation of the power source of warship.

Abstract: Patrol robots can be applied in many fields, such as accident prevention and Troubleshooting. In this paper, we introduce mechanical design and analysis of a tracked mobile system for patrol robot which solves the occupation problem of motor and gear box in traditional tracked mobile system. The structure of the tracked mobile system includes sprocket constructed by the wheel motor, closed track chain which is meshing with the sprocket and the idler and also hinged by track shoes and high intensity pins. Finally, finite element analysis is carried out on several key components to verify the rationality of the design.

Abstract: Axisymmetrical hemispherical pieces belong, in considering plate thickness variation of normal anisotropy, hardening and friction, BHF on the basis of various factors such as the establishment of the different stages of the forming process of the mechanical model of the deformation zone is derived the calculation equation, the preparation process, the process for drawing the stress-strain state and the shape of the part thickness distribution for a complete numerical analysis.

Abstract: In order to satisfy the design and application requirements of the suck rod in the suck rod system, the method of design and evaluation for the multistage suck rod is studied. Through the coupling calculation of rod load and the reasonable centralizer spacing, the friction force and contact position between the centralizer and tubing are determined, and the analysis system for the multistage suck rod design and evaluation is established on the basis of well track for the equal strength design and stress comparative analysis. With the analysis system, a fast and effective tool is provided for the reasonable design and evaluation of suck rod to improve the service life of suck rod.

Abstract: This article selects GCr18Mo steel to make an inner ring of rolling bearing. After isothermal quenching heat treatment, microstructure and mechanical properties are tested. The results show that microstructure and hardness from the surface to the core is uniform. The compositions are lower bainite and carbide, and both of them are small. The length-width ratio of lower bainite needle is about 10, and the average diameter of carbide in is 0.33μm. The hardness ranges from the surface to the core is between 715 HV and 755 HV, the average hardness of the inside and outside surface is 59.9HRC. Stress state of the surface is compressive stress and axial compressive stress is greater than the one of the hoop. Compressive stress in axial direction is about 588MPa, which is about 390MPa in the direction of the ring. After polishing, compressive stress in axial direction is about 483MPa, which is about 231MPa in the direction of the ring.

Abstract: With two degrees of freedom five-bar linkage as the foundation, carry on the multiple loop coupling, built three crank controllable nine bar mechanism similar to that of the crank slider pressing, which can meet the controlled flexible output, and conform to the mechanical properties of crank slider pressing mechanism. We use the loop analysis method to analyze the singularity of the mechanism. Analysis through two steps, first of all analysis on three crank existence conditions and the entire organization singularity, it is concluded that the condition of mechanism dont have singularity, and according to the singular condition carrying on research of singularity position, the long rod assembly condition is obtained.

Abstract: A four in-wheel-motor drive electric vehicle has four independent steering and independent suspension.This paper is to present a novel design of an independent suspension to reduce the uneven tire wear caused by scrub radius based on those independent suspension . Build a virtual model of the novel suspension in ADAMS and simulate. Verify the method by simulate