Luo Minzhou

Analysis of an Eddy Current Sensor for Liquid Pressure Measuring by FEM simulation

The influence of the uniform pressure on the induced magnetic field and the eddy distribution is shown in this paper to provide foundation for the design of an eddy current sensor for measuring the liquid pressure. For reviewing the distribution characters of the magnetic field and the eddy current, the basic principle of the eddy current sensor for liquid pressure measuring is discussed firstly, and the mechanical analysis to the diaphragm of the sensor is carried out to describe its deformation under the pressure, which influences the magnetic flux density of the system. Then the finite element method (FEM) model is built using the electromagnetic theory and the functional analysis to get the magnetic flux density and the current density of the coil. At last, the simulation results is got, which shows the change of the magnetic flux density when the pressure being loaded.

Virtual link-lengths approximating method for forward kinematics of multiple motion-coupled linkage mechanism

The forward kinematics of one kind of multiple motion-coupled linkages mechanisms were investigated, which were applied to the finger of one kind of under-actuated hand, when the finger was not touching any objects. By setting virtual link-lengths for multiple motion-coupled linkages, a numerical approximating method to solve the linkages forward kinematics was advanced. The objective was to improve the iterative speed slowed by the motion-couple of multiple linkages. In this method, these virtual link-lengths were used as several new variables in Newton Iteration to reduce the amount of derivation and computation for each differential iterative step and then the entire computing time. The operating speed had an obviously improvement in a numerical example.

Co-Simulation Research of the Mechanical-Hydraulic-Control Coupling System of ITER Tractor

The virtual prototyping models of the mechanical, hydraulic and control system of the ITER tractor were built with CATIA, ADAMS and MATLAB/Simulink respectively according to its heavy load and high precision characteristics, and the data transfer between the different models was accomplished by the integration interface between different software. Consequently the virtual experimental platform for the multi-disciplinary co-simulation was established. A co-simulation study of the mechanical-hydraulic-control coupling system of the ITER tractor was carried out. The synchronization servo control of parallel hydraulic cylinders was implemented, and the tracking control of the preconcerted trajectory of the hydraulic cylinders was realized on the established experimental platform. This paper presents the optimization design and technology rebuilding for the complicated coupling system with its theoretic foundation and co-simulation virtual experimental platform.

Kinematics Simulation and Structure Optimization of Tilting and Lifting Mechanism of ITER Tractor

The ITER (international thermonuclear experimental reactor) tractor is an in-cask remote handling equipment, its tilting and lifting mechanism is important for the tractor operated with forty-five-ton plug in front of the ports of Hot Cell and VV (vacuum vessel) successfully. In order to better analyse the movement of this mechanism and decide the key design parameters accurately, a mathematical model of 7-link complicated plane mechanism was built up, and the calculation of design and kinematics simulation were implemented. The established mathematical model was proved to be valid by comparing the calculated result with that of kinematics simulation. Finally, the structure analysis and the optimization of its key part, tilting and lifting frame, were performed to guarantee the frames strength in bearing the heavy load of plug.