Energy saving in the electro-hydraulic system (EHS) that currently exists in most inverter used to adjust speed of the asynchronous motor (ASM) which drive a fixed displacement pump. The most controller commonly used control system such as PID and multi-input single-output (MISO) fuzzy controller. In this paper, a multi-input multi-output (MIMO) fuzzy controller is used to improve the energy saving performance of the EHS. The proposed controller is designed to control the pressure of the EHS to suit the actual needs of the load. The two inputs of controller received signals from the error and change in error of the load pressure of the EHS. For the two outputs of the controller, one output is used to control the inverter to adjust speed of an ASM which drive hydraulic pump, and one output that is used for control proportional pressure relief valve. The proposed controller was implemented to pressure control of compression machine. The experimental result showed that using a proposed controller can reduce power consumption was higher than compared with PID and MISO fuzzy controllers. Particularly, a MIMO fuzzy controller can reduce power consumption by up to 70.22% when compared to the conventional system.
In the last decade, industrial robots have been used in a variety of ways in manufacturing. Owing to the increasing demand for industrial robots, many institutions offer industrial robotic courses. However, industrial robots have been accepted as an emerging tool when it comes to teaching in the area of vocational education and training (TVET). However, it has proved difficult for teachers to adapt to teaching in this way. This paper presents the investigation of TVET teachers’ perceptions of an industrial robotic training course in Thailand. This course provides inservice training for 67 teachers who teach electrical, mechanical, or mechatronic engineering in vocational colleges. The training course uses a four-phase learning cycle: preparation with regard to the concepts of industrial robotics, pedagogies for teaching and learning, presentation, and the professional learning community. The results show that teachers face barriers and have expectations prior to training. Teachers’ satisfaction with the training course after training was also investigated.
Because of the hydraulic excavator operates in the hazardous working circumstance, operator of excavator exposed in harmful environment. Therefore, Tele-Operation for hydraulic excavator has been investigated to protect from the hazardous working environment. A development of Tele-Controller for hydraulic excavator was purposed in this paper. For the purposed Tele-Controller will be divided into two parts. The first part is a retrofit of hydraulic system by the addition of proportional valves from the existing valves into a hydraulic excavator. The second part consists of the embedded system, which serves as a control unit and processing the movement of hydraulic excavator. In addition, this section also contains notebook computer, joystick, IP cameras, and wireless equipment. For command from joystick and display from IP cameras are designed using the Microsoft Visual Studio and C# program. The performance of Tele-Controller was evaluated through the field test by experts and operators of hydraulic excavator system, which the results were satisfactory.
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