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In order to research the motion performance of vortex rings umbrella, finite element analytical approach is integrated to realize the complicated time varying motion mathematical model of vortex rings umbrella, as well as implements simulation and conformity validation for the model. At first, particle system is utilized to construct three-dimensional geometrical model of vortex rings umbrella according...
This paper proposes a cooperative control of multi-agent system to capture target object. When the agents capture the target object, they may be subjected to reaction force from it. Therefore, we have to consider the physical contact between the agent and target object. First, we introduce the second order model to consider reaction force from target object. The network topology among agents is time-varying...
In this paper, two different PID control methods are described to control of Maglev Guiding System for Linear Elevator. The linear elevator driven by permanent magnet linear synchronous motor (PMLSM) use the method to adopt the magnetic guidance system to control the PMLSM gap which changes frequently and can impact the vertical thrust and control the level vibration and noise in the process of start,...
The novel magnetic gasbag polishing technology is presented in this paper. It can be used in polishing the contact or non-contact zone between gasbag and mould surface. By means of the interaction between magnetic field and magnetic abrasive, the magnetic abrasive brush is formed, and abrasive particles filed can be controlled actively. The force of a single magnetic abrasive in the contact or non-contact...
Analysis of open type wharf berthing condition is a complex process. It is hardly to simulate the environment and test results, which are consistent with the actual situation with physical model. In this paper, ship-mooring test during mooring is conducted applying the Large Ship Maneuvering Simulation Platform on the basis of the hydrological, meteorological and underwater terrain data. Combined...
The stretching, that is, the distance between the centre of mass of the ssDNA and the antibody, has been studied using the potential of mean force calculations based on molecular dynamics and the explicit water model. Our simulations indicate that the 6 residues Gln43, Gly44, Arg98, Tyr100, Val136 and Thr137, pair interactions of antibody-ssDNA, and the 5 interprotein molecular hydrogen bonds might...
Performance of applications executed on large parallel systems suffer due to load imbalance. Load balancing is required to scale such applications to large systems. However, performing load balancing incurs a cost which may not be known a priori. In addition, application characteristics may change due to its dynamic nature and the parallel system used for execution. As a result, deciding when to balance...
Trajectory generator is necessary in many inertial navigation research fields. The paper gives the design method of a trajectory generator, and deduces the control equation in detail, then classifies the flight track into four fundamental stages. The trajectory generator resolves the flight track, generates specific force, angular velocity and position signals etc. To check the trajectory generator,...
After the general principle and the calculation process of some localization algorithms of wireless sensor network being introduced and analyzed, a novel algorithm of mobile beacon trajectory is proposed in this paper. Since a static trajectory does not work well in non-uniform, and a virtual force trajectory has some defects like worse stability, a combination trajectory is proposed, which is a new...
This study aims at evaluation of crashworthiness of rhombus concept car by comparing the response of related parameters in different collision conditions. For this objective the numerical method was used to simulate the dynamic responses of the rhombus concept car in frontal and small overlap collisions. The dynamic response parameters was analyzed and discussed in terms of the invasion quantity of...
The three dimension micro-scale flow field in spiral groove dry gas seals(S-DGS) is simulated by using CFD software based on gas lubrication theory in this article. Effect of gas flow state on the Seal performance is analyzed under different gas film thickness. Laminar model and k-ε turbulent model are used separately to obtain the open force, leakage rate. The results show that gas pressure distribution...
It is the focus of the research on the bearingless motors to suspend the rotor stably by controlling rotor radial displacement. Without studying the relationship between the radial suspension force and rotor radial displacement, traditional control method for rotor radial displacement has some drawbacks such as the complexity of computation and the time-consuming tuning. In order to overcome these...
As UHV double-circuit and Multiple-Circuit transmission line corridor were widely set up, it made the interaction among the various systems of common corridor worse. It is a serious problem to the running stability and reliability of transmission line. The interactions include the induced voltage generated by electric field capacitive coupling, the induced electromotive force and induced current by...
Overhead power lines are the prevailing facilities to carry electric energy along big distances. Their proper functioning is very important for the current society due our highly electrical-dependent lifestyle. During their working, overhead power lines are under different phenomena, such as short-circuits, high-speed winds, extreme temperature conditions and impacts, which can disturb their operation...
In this paper, a 3 degree-of-freedom bearingless permanent magnet motor with axial active suspension is proposed. The structure and suspension principle of this novel bearingless permanent magnet motor are described in detail and its suspension mathematical models are constructed. Based on the mathematical models, a control system is designed for the new type bearingless permanent magnet motor. The...
Debarking process is a very important step for many industrial uses of wood. The ring debarker commonly used in sawmills. The variations of the log physical properties, environmental and storage conditions, and debarking operation strongly influence the bark remaining, wood loss and damage percentages on debarked log. In this paper a MPC based ring debarking optimization system is presented. In this...
This paper presents the design and position control of a seesaw like supported beam which angular motion is measured by an encoder and controlled by the draft force of a propeller at end of the beam. After the general mechanical design and modelling the system, dynamic equations and parameters are investigated and all parts are drawn in SolidWorks, so that the real weights and inertias for the simulation...
This paper proposes an assist-handle for manual conveyance of flexible part and its semi-active operation assist control. The assist-handle consists of a handle, a variable damper and a mechanical spring. The variable damper and the mechanical spring are connected in parallel. The assist-handle can be attached to a general hand cart, through which a human operates the hand cart. In order to suppress...
Simulation and analysis of the dynamic force-free control of robot arm with revolute joints are presented in this paper. Initially, modeling of dynamic force-free control method is described. Then simulation is carried out for single arm and two arm links robots by adopting Matlab/Simulink environment. The model characteristics of the force-free control is utilized to demonstrate the autonomous safety...
In the World, especially in Europe high speed rail systems are increasingly becoming popular. Because of the environmental benefits, comfort, speed, time advantage and reliability of the electrical rail systems, their importance is more increasing. The interaction between the pantograph and the catenary is the most important factor affecting the quality of energy transmission. This article proposes...
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