The purpose of this research is to produce the e-learning media for the Light-Weight Vehicle Chassis and Powertrain Maintenance Subject. The type of this research is the research and development. The procedure applied in this research is the ADDIE model. Construct testing by the expert is done by curriculum expert, practitioner and teaching media expert. Construct testing and content testing were also conducted to 23 students as the user. Qualitative data were analyzed using an iterative step that is reading/memoing, describing, and classifying. Quantitative data were analyzed with descriptive statistics. The research result shows that YouTube Integrated Google Classroom Based E-Learning Media has been produced and tested for Light-Weight Vehicle Chassis and Powertrain Maintenance subjects. The construct testing shows that this e-learning media is decent based on an expert's judgment, and based on the user response shows that the reliability of the construct is good. The content testing shows that students who use the YouTube Integrated Google Classroom Based E-Learning Media have significantly greater learning outcomes compared with students who use the internet to access the website without control.

No abstract

In the slider-crank mechanism, where the rotational motion is transformed into the translational motion, the input torque is highly variable due to the inertial effect. The consequence of fluctuating torque is that it causes the load upon the prime mover to be inconsistent, which might likely results in higher stresses in the components, higher joint friction, and the necessity for higher driving power. In this paper, a technique of reduction of the dynamic torque and joint forces in the slider-crank mechanism using mechanical resonance is described. A comparative result of the conventional system in the process of gas compression, as a practical application example, is presented. The result shows that the utilization of resonance has the advantage of providing lower dynamic torque and rotating joint forces compared to the conventional operation. Since the compression of the air itself takes effect as a spring compression, in the gas compression process, the narrow torque and force region around the resonant frequency can be obtained with or without the use of spring as the element for storing the potential energy.