One of the most important case in humanoid robot designing is hand, which it consider as an country development. High percentage of robot work quality depend on hand capability. A robot function increase with hand movement. One of important movement in artificial hand capability relate to fingers lateral movement. This case has more effect intake of special objects such as round shape or moving taken object. In current research investigate robotic hand designing in humanoid pattern based on embedding motor in palm and also presented new mechanism for finger lateral movement. Presented mechanism was simulated in Solid works software and static and dynamic analysis, were done on it. Determining appropriate size and shape, finger lateral movement mentioned as research aim. پرونده مقاله

Considering the high consumption of the air compressors, a control system of screw compressor is designed and implemented to deal with energy saving and localization of mentioned compressor. In this paper the variable speed drive (VSD) control algorithm based on proportional-integral-derivative (PID) controller is optimized to decrease power consumption and more stable motor speed and outlet pressure. Automatic PI factors adjustment according to system behavior is goal of this control system. To show the validity of the proposed algorithm, we simulated P and I changes. The results of simulation and practical test on a GA111 Atlas Copco compressor were established which demonstrate that the proposed algorithm provides system stability improvement and as a consequence depreciation reduction and energy saving were achieved. پرونده مقاله

Due to the widespread use of refrigeration systems in industries, residential and commercial buildings and the major contribution of these systems in the consumption of electrical energy, extensive research is underway to find new technologies for cooling and refrigeration systems. Considering the high consumption of energy in the compression and absorption refrigeration systems, researchers and engineers are developing new refrigeration methods and systems, including modern thermoelectric refrigeration systems. Due to the low coefficient of performance of thermoelectric based systems, extensive research is needed to optimize, develop and find new design methods for these systems. Therefore, in this research, the optimization of the cooling system based on the thermoelectric system has been conducted. For this purpose, the imperial competitive optimization algorithm (ICA) has been used to optimize the thermoelectric system. The objective function of the optimization is the cooling capacity of the refrigeration system. Various parameters of the thermoelectric refrigeration system, such as the amount of electric current on the cold and hot sides of the refrigeration system, were selected as design and optimization variables. The obtained results of the present study have been compared with the results presented by previous researchers. The outlined results revealed that ICA algorithm has a high capability in the optimal design of thermoelectric refrigeration systems. پرونده مقاله