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Mahyuddin, A. I
Mesin
Mechanical Engineering

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ANALISIS LOMPAT VERTIKAL TIPE SQUAT DENGAN MODEL SISTEM BENDA JAMAK Susilo, D D; Mahyuddin, A. I; Nurprasetio, I. P
Mesin Vol 24, No 1 (2009)
Publisher : Mesin

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Abstract

Vertical jump is a good indicator for success in sports that need strength and speed of lower extremity such as basketball, volleyball, and soccer. The skeletal model of human body is treated as a two dimensional multibody system to analyze vertical jump. The squat jump of a particular subject could be simulated on the multi-body system model. The simulation results in the maximum jump height in close agreement with the height obtained via the flight time method analysis. Hence, the simple multibody model is deemed adequate for squat jump analysis. Furthermore, the results of this research could be used as a basis for further modeling and analysis improvement. Advanced model should take into account the effects of the muscles. Accurate measurement could be achieved by employing better sensors and data acquisition system. Future results of investigation in the area of dynamics of human movement could serve the sport world and medical rehabilitation program.
KARAKTERISTIK PENGAYAK GETAR DENGAN SUMBER EKSITASI POROS EKSENTRIK Bur, M; Nazaruddin, Nazaruddin; Mahyuddin, A. I; Samudra, J
Mesin Vol 15, No 1 (2000)
Publisher : Mesin

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Vibrating screen is an equipment used to seperate material according to its particle size. It is usually operated in combination with a crusher. A vibrating screen prototype has been developed. This prototype, called as “Pengayak Getar Semen Padang Prototipe—0l" (PGSP PRO-01), employs an eccentric shafi‘ to excite the screen. The prototipe was designed to obtain several experimental parameters such as deck elevation, eccentric shaft rotational speed, screen capacity,types of material and screen mesh, gradation of material and spring stiffness. The characteristics of vibrating screen and material sieved may be determined experimentally. In this study, the performance of PGSP PRO-01 is examined by using silica sand, with a bulk density (ρ) of 1.54ton/m3, and material gradation of 50% of the grains larger than 5 mm, 35 % between 2.5 - 5 mm and 15% are less than 2.5 mm in size. Assuming a 92% screen efliciency and a 0.32 m2 screening area, theoretical screen capacity of 7.5 ton-per-hour (tph) is obtained. Experimentally, optimum screening parameters obtained are 7.2tph capacity at 91.7% efliciency resulting from a 900 rpm speed of eccentric shafi and a 10° deck elevation.
Co-Authors Bur, M N. Nazaruddin Nurprasetio, I. P Samudra, J Susilo, D D