The body shape of a vehicle and the structure need to be considered when designing a vehicle. In addition, the shape of the body tends to significantly affect the vehicle's energy use to counter aerodynamic forces due to wind loads. Therefore, this research aims to determine the body length, width, height, wheel base and ground clearance of vehicles in the selection of Bono Kampar for Urban Concept Car Formula to Fulfill Indonesia Energy-Savings Standards (“KMHE”) with Aerodynamics Analysis. The methods used to create four models of vehicle bodies are dynamic simulation on Computational Fluid Dynamic software are coefficient drag, lift and bland force. The result showed that the car body design needs to have the smallest drag coefficient. This is because when vehicles have a large drag coefficient value, it tends to greatly influence its efficiency or performance. Furthermore, this is useful for minimizing fuel usage, and in allowing the vehicle to reduce the friction force caused by air while driving. The Computational Fluid Dynamic (CFD) software is used to obtain drag coefficients, which is used in Solid works Flow Simulation. From aerodynamic simulation results on four alternative car bodies carried out in this study, the smallest Cd (Coefficient Drag) is the second car body model, which has Drag Coefficient (Cd) of 0.21 Pa.
Weighbridge was a measuring instrument that was widely used by the Ministry of Transportation to scale the weight of loaded vehicles on the roadways. Due to being traversed by vehicles with various kind of weight and sizes, weighbridges often experience resonance due to the vibrations of vehicles above it. This will potentially cause damages to weighbridges. To anticipate it, researches regarding vibration analysis on weighbridge were needed to decrease resonance on weighbridges. The Vibration Analysis was done by Modal Analysis Method using three accelerometers and one shaker as the measurement sensor. In testing, weighbridge was modeled into a cylindrical beam shape with a length of 724 mm and a diameter of 16 mm. As the supports, Fix-fix Support was used at both ends of the beam. Next, Accelerometer measurement sensor mounted in three positions with a distance of 181 mm, 362 mm, 543 mm from beam supports. Then, Excitation force with four frequency variations (1 Hz, 3 Hz, 5 Hz, 10 Hz) was applied to the four measuring points located between the accelerometer sensor. The measurements result in the form of FRF graph can be obtained by QuickDAQ. From the FRF graph, the five lowest natural frequency of the weighbridge was obtained that equal to 89.9 Hz, 91 Hz, 69.9 Hz, 75 Hz, and 96.9 Hz.
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