This study discusses a method for the automatic design of injection-mold cooling channels using genetic algorithms (GA), the finite element method (FEM), and an evaluation function based on unsteady state heat transfe...
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This study discusses a method for the automatic design of injection-mold cooling channels using genetic algorithms (GA), the finite element method (FEM), and an evaluation function based on unsteady state heat transfer and linear static deformation. The uniformity of cooling and the deformation effect of the automatically designed cooling channel in the injection mold were examined through case studies based on numerical analysis. The genetic algorithm was applied in the following steps: generation of finite elements of individuals expressing different cooling channel shapes, the definition of the fitness function to evaluate individuals, the genetic operation for individuals, and modification to the automatically generated cooling channel shape. Finally, the automatically generated shape of the cooling channel is discussed.
The IM has been adopted widely as the driving sources of the industrial machine and the plants. That reason is that IM is robust and easy to drive. A typical line-start drive system is a motor operated valve arranged ...
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The IM has been adopted widely as the driving sources of the industrial machine and the plants. That reason is that IM is robust and easy to drive. A typical line-start drive system is a motor operated valve arranged to the power plants, the chemical plants. These valves are used for application that energy supply is shut down in an emergency. So, the IM which makes valve operate is connected to 3-phase power supply directly and used. Because of this, the drive system heart of an IM has very high reliability. However, mechanical deterioration is problem. Routine inspections are carried out to those valves and reliability is secured. A conventional failure diagnosis is the examination which motor operated valve is disassembled regularly. However, conventional method has some risks. So, it is hoping to judge trouble possibility easily from the torque and the speed. If torque and speed sensors are set around the IM, torque and speed can be measured easily. However, the permanent establishment of the sensors is difficult because the movement environment is very severe. We wish that the torque and speed information for failure diagnosis is estimated by using current and voltage sensors put near switchboard. This paper presents torque and speed estimation method for Line-start IM. We use the dot-cross products of current and voltage vectors. The current and voltage vectors are measured with the switchboard which supplies a power supply to IM. As for the proposal technique, the torque and speed estimation of IM not only in the static state but also in the transient state is possible. Furthermore, we cope about the electric parameters as follows. The stator resistance value is measured. The values of leakage inductance, mutual inductance and rotor resistance are identified. Proposed estimation methods are verified by results of experiment.
We are developing an autonomous personal robot able to perform practical tasks in a human environment based on information derived from camera images and a knowledge database. In the robot's adjustment to a human ...
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Communication between a person and a robot is necessary for the robot to be able to function in a human living environment in such a way as to be helpful to the humans. A human being needs to send a command to a robot...
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We are attempting to develop an autonomous personal robot that has the ability to perform practical tasks in a human living environment by using information derived from sensors and a knowledge database. When a robot ...
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In our research, we developed a technology for our robot that uses an indoor navigation system based on visual methods to provide the required autonomy. For robots to run autonomously, it is extremely important that t...
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This research aims to develop a combined sense system that uses both the sense of a force feedback as well as visual feedback in the shape of microscopic features from a micro sample. It is thought that the efficiency...
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In this paper, we propose the method to realize high efficiency control for IPMSM (Interior Permanent Magnet Synchronous Motor). In this method, we pay attention to the torque equation. We realize high efficiency cont...
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In this paper, we propose the method to realize high efficiency control for IPMSM (Interior Permanent Magnet Synchronous Motor). In this method, we pay attention to the torque equation. We realize high efficiency control by controlling the vector angle of stator current. As for the high efficiency control, we define the optimum angle as the stator current angle which makes the torque biggest against certain stator current value. The optimum angle is shown as the equation about the stator current value. In addition, we propose the methods to find real optimum angle for the real system by changing stator current angle around calculated optimum angle in the low frequency. Furthermore, we show the possibility of more efficiency method to find real optimum angle by using the disturbance observer. Proposed method is realized by uniting between motor drive control region and mechatronics control region. The proposed method is validated by simulation.
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