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The capability of avoiding static obstacles independently is the premise for air cushion vehicle (ACV) operating safely. In this article, an ACV collision avoidance control based on improved artificial potential field method is designed as auxiliary operating system to ensure safe navigation of ACV. It builds mathematical model of the ACV and searches the data of static obstacles. Besides, the collision...
In order to solve the problem of energy supply for wearable and portable electronic equipment and exoskeleton, a direct energy recovery mechanism based on hydraulic transmission principle was designed. Firstly, according to the particularity of human body structure and function, establish a theoretical model can reflect the state of human body by Lagrange modeling method. Based on the established...
There will always have a greater residual stress in the processing process of the micromechanical gyroscopes straight elastic-beam. affecting the performance of micromechanical gyroscopes. According to the principle of stiffness equivalence, the original elastic-beam of the micromechanical gyroscope is improved to the beam of drive as the U-beam and sense as the carb-leg beam by the combination of...
In order to accurately simulate vehicles' running states of lane changing and more effectively reflect its characteristics, based on the driving experience, this paper introduced three changing rules and their corresponding lane changing benefits and safety factors, and summarized the lateral and longitudinal motion of vehicles as the interaction result between lane changing benefits and safety factors...
Limited travel constrains the widely application of XYZ parallel micro/nano-positioning stage. In this paper, a novel parallel-kinematics micro/nano-positioning stage is proposed with the goal of enlarging the travel range. In order to obtain a large input displacement for actuating the stage, voice coil motors (VCM) are adopted. For a large-travel parallel stage, the cross-axis motion increases the...
The main objective of the presented work is to do a preliminary sensitivity analysis of the simplified neuromusculoskeletal model of the human middle finger that we have already developed [1], [2]. The importance of this study is to improve the model by well estimating internal parameters, which are the most affecting the model output, and by adapting it to each individual. The sensitivity analysis...
This paper discusses how to apply virtual prototype technology to analyzing driving mechanics of the patrol robot for belt conveyor. Virtual prototyping model has been established for inspection robot, and simulation experiments has been completed in planar motion and climbing movement simulation. By analyzing the simulation results, Wheel-rail inspection robot has good driving characteristics in...
In this paper, the dynamic characteristics of two types of electromagnetic repulsive force actuators are compared using the simulation of finite element method. The two electromagnetic repulsive force actuators are equipped with a single-sided coil and a double-sided coil respectively. Initially, the construction and theory of each of the electromagnetic repulsive force actuators are discussed. Subsequently,...
Ring Main Unit(RMU) are now widely used to protect MV/LV transformers as well as construct Loop distribution system. It uses SF6 gas for insulation and therefore it can possible to make compact switchgear and maintenance free due to tightness tank structure. It consists of Load Break Switch(LBS), Fuse combination switch and Circuit Breaker(CB) including Vacuum Interrupter(VI). Especially, a RMU using...
Vacuum Circuit Breaker (VCB) consists of the main frame with the operating mechanism and the main circuits including VI (Vacuum Interrupter). Especially, a VCB for the generator protection, which is used in a power plant, requires very large contact spring force because it has to be able to withstand the high short circuit current. In order to release closing energy of VCB, the cam type mechanism...
This paper presents a new type of electrically driven mining vehicle which adapts to the characteristics of seabed complex terrain environment. The optimal drive motor is selected and the corresponding control algorithm is designed. The obstacle surmounting process and the change law of the output torque of the electric driven mining vehicle under typical working conditions are analyzed. The simulation...
In this paper, the emergency braking of high speed train is studied, and the relationship between the braking force, resistance, speed and deceleration is discussed. According to the Newton's second law of motion, by discretizing the speed and displacement, the emergency braking model of high speed train is established. Further, the unobserved braking parameters of model are identified by the iterative...
Modeling helps explain the fundamental physics hidden behind experimental data. In the case of material modeling, running one simulation rarely results in output that reproduces the experimental data. Often one or more of the force field parameters are not precisely known and must be optimized for the output to match that of the experiment. Since the simulations require high performance computing...
This paper deals with an analysis of the design parameters and its influence on performance of the linear induction motor (LIM). LIM propels using Lorentz force generated by interaction between magnetic flux of the primary and eddy current induced in secondary. As depending on the size of the primary and the secondary, not only magnetic flux and induced eddy current, but also performances of the LIM...
To develop a new standard design of gas-insulated bus(GIB), an electromagnetic-structural finite element analysis has been conducted considering the electromagnetic force generated in GIB with a large current. The GIB are electrical bus-bar parts of a gas-insulated switchgear(GIS) installed as a protective device in power plants and substations. Since the electromagnetic forces generated by a large...
A linear actuator suitable for sun tracking applications, heliostats, was investigated. First, a benchmark actuator was modelled using Finite Element (FE) analysis and then a prototype was constructed. The electromagnetic force on the mover was simulated and was found to be in excellent agreement with experiment. Next; a three-phase, direct-drive, linear actuator was proposed, which has a step size...
We consider efficient controls for swimming with multiple rigid legs at low Reynolds number. We derive equations governing the translation and rotation of a general class of multi-legged swimmers, and we formulate energy-efficient controls of symmetric swimmers as a problem in geometric control theory. We then focus on the case of symmetric swimmers with multi pairs of legs. In the framework of sub-Riemannian...
The cycloid drive usually has a cycloidal wheel meshing with pins to achieve transmission. The profile of the cycloidal wheel is generally a curve derived from an epitrochoid. This paper presents two design types of cycloid drive, the cycloidal wheel profile of one is internal offset of epicycloid and the other is external offset of hypocycloid. Parametric 3-D models of the two design types are constructed...
This paper originally applied an optimal sliding mode based optimal composite nonlinear feedback (ISM-CNF) control strategy to the capacitive micromachined ultrasonic transducers (CMUTs) system. It is known that CMUTs system is inherently unstable which results in pull-in phenomenon and sensitive to a small perturbations. Therefore the major problem is to stablize the CMUTS system beyond the pull-in...
The amount of stroke patients has been raising year by year. The traditional treatment supplies the patients with some drugs combining with physical rehabilitation methods. However, in the course of rehabilitation therapy, the recovery of patients often is limited by the level and experience of the therapists. Furthermore, the rehabilitation therapy is uasually lack of scientific and accurate assessments...
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