<p class="Abstract"><em>One technology to support production speed is electric motors with high performance, efficiency, dynamic speed and good speed responses. DC motors are one type of electric motor which is used in the industry. Sliding Mode Control (SMC) is the robust non-linear control. The basic theory regarding SMC is presented. The SMC design which is implemented is the speed control of the DC motor is analyzed. The controller is implemented in simulation using MATLAB / Simulink environment. The step response and signal tracking test unit are carried out. The results show that SMC has a better performance compare to PID which is faster settling time and no overshoot and undershoot. </em></p><p class="Abstract"> </p>
<p><em>The placement of outdoor fitness equipment at tourist attractions is one of the attractions for tourists. Besides that, it can also be used as a means of health socialization for the community in public places. The elliptical trainer type air walker is a popular fitness tool because it is easy to use and has a small risk of injury. Elliptical trainer has a working principle like a walking person where movement is influenced by the force of the hand and leg movements. The design of an elliptical trainer fitness equipment that will be placed in a public place needs to be done to get a good level of security. This article discusses the design of an elliptical trainer device that is safe to place outdoors. The design process uses the Solidworks 2017a application. The elliptical trainer is divided into 4 parts, namely the main frame, drive shaft, hand handle, and leg handle. The manufacturing process is carried out based on Design Manufacture and Assembly and machinery to reduce the risk of manufacturing failure and make it easier to work on. The result of the elliptical trainer design has dimensions of 2,500 x 1,800 x 1,000 mm. The main frame has a safety factor of 3 with a displacement of 8,524e-7 mm.</em></p>
Wind energy sources must be investigated to produce electrical energy from a renewable source. Crossflow wind turbines are suitable for use because they have several advantages such as self-starting ability, low noise, and excellent stability. They have the potential to be applied as small wind turbines in urban districts because of their small maximum coefficient of power (Cp), which is 10% of that of other small wind turbines. To enhance the performance of crossflow wind turbines, we changed the turbine to rotate in the opposite direction in the in-line configuration. Turbine performance testing was tested using a wind tunnel. The characteristics of crossflow wind turbines were investigated, then turbine performance was analyzed and discussed. The maximum power coefficient obtained was 0.169 (Cp) with the configuration of 12 turbine blades at a wind speed of 10 m/s. The maximum torque coefficient obtained was 0.703. The overall results show that the crossflow wind turbine in in-line configuration with opposite rotation can improve the performance of wind turbines.
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