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Power consumption is one of the key optimization objectives for modern integrated circuit designs. More than 40% of the total power consumption is contributed by clock trees due to their high frequency of switching and high capacitance. In the traditional physical design flow, placement is done before clock tree synthesis (CTS). CTS constructs a tree to connect the clock source with all the registers...
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 this paper, in order to replace a conventional electric linear actuator which is consist of rotary PM machine and ball screw, a novel double-sided five-phase modular linear permanent magnet synchronous machine (MLPMSM) is proposed and designed with the same volume. The basic structure of the machine is firstly described and the major dimensions of one module are then optimized to acquire the largest...
Needle-free jet injection allows delivery of liquid drugs through the skin in the form of a narrow fluid jet traveling at high speed, minimizing the risk of accidents. The use of a controllable actuator to drive this process has many advantages, but the voice coil actuators previously used are too large and heavy for practical use with common injection volumes (∼1 mL). We instead propose a compact...
This paper deals with the automated design of a Virtual Sensor used to estimate the vehicle planar motion states and the axle lateral forces. It is proposed to substitute the cumbersome and non-trivial manual task of tuning an Extended Kalman Filter by using meta-heuristic optimization, and in particular, employing the contrast-based Fruit Fly Optimization Algorithm (c-FOA). c-FOA is a recently developed...
This work presents a potential field-based control approach for multi-agent dynamical systems in a multi-obstacle environment. A strong focus is put on solving the collision avoidance (either with obstacles or other agents) problem, which is essential for any multi-agent control strategy. In here we discuss potential field constructions which are used for penalizing in the cost the collision avoidance...
The paper proposes an optimized geometry for a DC electromagnet combining the experimental design (DOE) and FEM. The optimization problem takes into account three geometrical parameters (coil shape ratio, support thickness ratio and support height ratio) and consists in maximization of the acting force related to the largest air-gap, preserving the global dimensions of the device (external radius,...
This paper presents a cooperative shared control driver assistance system which supports the driver in the longitudinal vehicle control. The system architecture design enables the driver and the assistance system to apply a force on the accelerator pedal. Therefore, a cooperative control algorithm has to be developed. This design problem can be described mathematically as a differential game. For...
This paper studied the optimization of the shunt release electromagnet based on Ansoft maxwell finite element simulation. The minimum size as the optimization target by taking into account the electromagnet force and temperature rise limit. In this study the electromagnetic force is calculated using finite element simulation, demand of temperature rise limit is satisfied by limiting the maximum current...
In this paper, we formulate the unmanned aerial vehicle path planning problem as a multi-objective mixed integer programming problem. We minimize the fuel and time consumption at the same time. The elastic constraint method for multi-objective optimization is used to solve the problem. Experiment results show the trade off information between the two objectives, and the effectiveness of our proposed...
The train brake system is a complex pneumatic device whose performance and reliability are relatively important. When the train is beging braked, the coupler force caused by the inherent delays in pneumatic airbrakes, commonly used in freight trains, becomes relatively large. The problem is even severe for long freight trains where the delayed response involves heavy longitudinal forces between vehicles...
This paper presents a ironless actuator with two degrees of freedom (2-DoF), which generates a magnetic levitation and propulsion force. It is characterized by a very simple compact construction with a freely accessible mover from above. As a result, it provides a cost-effective solution for vacuum compatible high precision magnetically levitated planar systems. Two possible topology based on this...
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 combines coverage control, random-walk and artificial potential method to deploy multi-copter type Unmanned Aerial Vehicles (UAVs). With the coverage control, it is able to deploy agents in the coverage area with arbitrary distribution based on the purpose of control. However, when initial position of agents concentrates on one location, it could be fallen into the local optimal solution...
Surface registration is an inevitable step for solving the correspondence problem in statistical shape modeling and useful for automatic 3D segmentation of objects of a certain shape. Common techniques for a pairwise surface registration rely either on a point-based or a mesh-based representation of the source (moving) and the target (fixed) surface. Iterative closest point (ICP) algorithms operate...
This paper describes the optimization and the performance evaluation of a Permanent Magnet spring. A dedicated semi-analytical model of the device is developed allowing for fast and accurate evaluation of the force vs. displacement characteristic of an arbitrary arrangement of coaxial ring-shaped PMs. This model is used to define the cost function to find the optimal PMs configuration which realizes...
This paper presents the comparative study and optimal design of a transverse flux linear machine with different PM configurations, viz. surface-mounted and consequent-pole, in which the consequent-pole version is firstly proposed. Firstly, the effect of variation of the main design parameters on both topologies are studied. Then, the multi-objective optimization method based on genetic algorithm combined...
As a kind of green energy, the wave energy exhibits high energy density, abundant global reserves, extensive application and high predictability. To this application, the direct driven linear motors already become strong candidates in recent year due to the motion feature of waves, therefore a kind PM-assisted reluctance synchronous linear generator (PMRSLG) is proposed in this paper. Based on FEA,...
Parameter optimization of active suspension in in-wheel motor driven electric vehicle using genetic algorithm (GA) is presented. In such vehicles, placing the motors in the wheel results in an increase in the unsprung mass, which greatly deteriorates the suspension ride comfort performance and road holding ability. Structures with suspended shaftless direct-drive motors have the potential to improve...
In this paper, a new modular linear flux-switching permanent magnet machine is presented. The operation principle is illustrated in detail. The electromagnetic performance analysis of the machine is carried out by the finite-element method. To investigate the influence of the mover pole pitch to stator pole pitch ratio on the new modular machine, the proposed machines with three different ratios are...
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