Advanced Materials Research Vols. 308-310

Abstract: In order to fulfill the requirement of vehicle dynamics performance and real-time capability in driving simulator, modeling and simulation method of a four-wheeled vehicle model based on multi body dynamics software Vortex was studied. Fundamental construction and dynamics properties of the model such as body, chassis, wheels, power train, suspension and tyre model were described. The model was tested to simulate on the C grade of road. The results indicate that the model and simulation method can well represent vehicle dynamics performance and high real-time capability of simulation, and is worthy to apply to driving simulator in the future.

Abstract: In order to study Siemens- Schottel- Propulsion (SSP) vibration for the marine electrical propulsion system, the SSP vibration analysis has been carried out in this paper. SSP suffers from harmonic vibration and torsional vibration of propeller and wave flow random disturbances. Vibration mode superposition method is applied to SSP vibration model. The SSP dynamic model has also been established based on SimMechanics. The simulation results show that the proposed way is important to forecast and prevent SSP vibration and to provide for the SSP management.

Abstract: In order to study the curve passing performance of urban track vehicle and to evaluate its safety, the calculation model was established and simplified. Then track irregularity was used as input and passing curve was set up. The simulation modal was produced with software SIMPACK. With the track irregularity, the traveling safety of the vehicle was analyzed. The simulation results show that the traveling safety of the track vehicle could satisfy the requirement of relevant standard.

Abstract: The membrane coupling plays an essential role in the transfer process of the wind wheel torque. In order to meet the design requirements and get more accurate stress analysis state of membrane, based on the finite element software HyperMesh, membrane and the surrounding model is regularly meshed into hexahedral element, and to MSC.patran analysis platform, to check the strength of the coupling. The result of analysis showed that, the maximum stress and deformation of coupling can be met to the design standards and reach the requirements also. Using of hexahedral element, analysis time of CPU can be reduced and smoother stress and strain contours cloud can be also obtained, so it provides a more scientific basis for the design and manufacture of membrane coupling.

Abstract: This paper presents a novel compact manual instrument for minimally invasive surgery (MIS). The instrument possesses several good features, such as large workspace, high flexibility, low friction and comfortable operability. The structure of the instrument is a basic configuration of some manual instruments. Besides basic operations, it can be applied to accomplish some more difficult processes, e.g. suturing and knotting. Based on screw theory and product-of-exponentials (POE) formula, the degree of freedom (DoF) and kinematics of the instrument are analyzed in the paper. The calculation results are verified by the simulation.

Abstract: With the depth of space exploration and applications, the space robot self-assembling has become more and more important for space on-orbit service. Parameter analysis is an indispensable work of assembling process design. The dynamic model of the space robot with target is established firstly, then the Hertz model is introduced as the collision model between the docking link and the capturing cone, and the operational space control is applied to achieve the assembling operation control under the Cartesian space. Then the paper focuses on the discussion and analysis of the influences of the parameters such as the stiffness coefficient, friction coefficient, leading speed coefficient and vertical speed damping coefficient on the assembling characteristics. The simulation results would provide a basis for assembling control and parameter design and have an important academic value and engineering significance on space service.

Abstract: In order to resolve the contradiction of cylinder, nipper and detaching roller in movement coordinate on high speed comber, use elliptic gear transmission make cylinder turn changeably. Use MATLAB software calculates and simulates the angular displacement, angle velocity and angle acceleration of cylinder speed change movement. Then technological parameters such as the timing of combing with cylinder speed change, and the timing of the last row of needle on cylinder through detaching roller are analyzed. The results show: cylinder transmission mechanism by the style of elliptic gear can achieve short time of cylinder combing, increase time of preparing of detaching and lapping and time of lap raise end. Meanwhile the last row of needle on cylinder passes detaching roller earlier, cylinder catches away reversed combed web from detaching roller is effectively avoided.

Abstract: The robot joints are usually rotational axis by two link joints, bionic features is not strong. The shortcomings of intelligent MR damper control multi-axis bionic knee can only provide resistance and certain sizes to regain momentum, cannot provide larger power, therefore this paper gives by the multi-axis four-bar structure, ball screw transmission multiaxial bionic active knee institutions. And analysis the human leg institutions and commonly used two-bar structure, through multi-variable optimization method to solve the design parameters of knee joint structure, the motor angular velocity and torque. And established in a bionic active the knee's virtual prototype.

Abstract: Based on the theory of fluid dynamics and principle of thermodynamics, the characteristic of the stiffness, natural frequency and damping of cylindrical air spring are deduced. Moreover, simulation model for dynamic characteristic of air spring is established under the environment. The simulation results show the characteristics of cylindrical air spring is superior and the isolation effect is good.

Abstract: The aim of this paper is to test the trajectory precision of the execution terminal of the industrial robot based on a non-contact laser tracing measurement technique. The target is found in terms of tracing mirror attached in measurement position. This method utilizes the linear motion units and photo detection units to trace the target actively. The measurement of the target coordinates are measured with the laser interferometer linear measurement module and the grating ruler. This system can achieve the trajectory measurement of the planar motion objects without contact in real-time condition and also possesses the high precision. The experimental work and calculation were performed in order to achieve the trajectory precision of the research.