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All Journal Journal of Engineering and Technological Sciences Mesin
Mahyuddin, Andi Isra
Faculty Of Mechanical And Aerospace Engineering, Institut Teknologi Bandung, Jalan Ganesa 10, Bandung 41032, Indonesia
Engineering Mechanical Engineering

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Journal : Mesin

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Development of a 3D Gait Measurement Protocol for Amputees Walking on Treadmill Mahyuddin, Andi Isra; Ferryanto, F; Herman, Indria; Mihradi, Sandro; Dirgantara, Tatacipta
Mesin Vol 26, No 1 (2017)
Publisher : Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1207.701 KB) | DOI: 10.5614/MESIN.2017.26.1.4

Abstract

Walking motion is actually a complex activity since it involves many body parts, especially the lower limb. Due to the needs for gait analysis in many medical applications, Biomechanics Research Team at ITB has developed an affordable optical motion analyzer to measure motions of subject walking over ground. However, the needs for multicycles gait data is better met by measuring subjects walking on treadmill. This paper discusses the modification of the developed motion analyzer to accommodate data acquisition of subject walking on treadmill, including those of transfemoral amputees. Seven markers, two 95 fps cameras, a dual-channel Camera Link Acquisition NI PCIe-1430 frame grabber, and a workstation are employed in the optical motion analyzer system. The speed displayed on the treadmill is evaluated. Additional equipment such as the modified hydraulic engine crane and the body harness are introduced to ensure the safety of amputees and avoid the risk of falling down while walking on the treadmill. The modified motion analyzer system is then used to obtain gait parameters of normal (37 males and 31 females) and three amputee subjects. The gait parameters of normal subjects in the treadmill walking shows that there is a decrease in the stride length and range of motion, and increase in the cadence due to walking adaptation. There are also phase shifting and increase in the range of motion for amputee subjects compared to the normal subjects which imply that there is an extra work done by the residual limb in doing walking movement and the amputee subjects try to balance their walking on the treadmill.
ANALISA TEGANGAN EKSPERIMENTAL DENGAN METODA FOTOELASTISITAS Mahyuddin, Andi Isra; Boestaman, Refrizal; Suharto, Djoko
Mesin Vol 3, No 4 (1984)
Publisher : Mesin

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Abstract

Analisa tegangan dengan metode fotoelastisitas tembus cahaya dua diemsi adalah salah satu metoda optik yang digunakan dalam yang akan diuji dibuat modelnya dari bahan polimer tembus cahata. Model kemudian diletakkan pada perangkan pengujian dan dibebani serupa dengan pembebanan prototip. Hasil pengujian berupa pola garis isokromatik yang merupakan tempat kedudukan titik dengan selisih tegangan utama yang sama, dan pola garis isoklinik yang merupakan tempat kedudukan titik dengan arah tegangan utama yang sama. Data orde isokromatik dan parameter isoklinik digunakan untuk menentukan distribusi tegangan.
ANALISIS KETIDAKSTABILAN PARAMETRIK MEKANISME EMPAT BATANG ELASTIK Huda, Syamsul; Mahyuddin, Andi Isra
Mesin Vol 17, No 3 (2002)
Publisher : Mesin

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Abstract

The need to increase operational speed and reduce the inertia effects led to the design of slender members. Consequently, elasticity of these members could no longer be neglected. The elasticity results in varying stiffness of the elastic member leading to parametric excitation. The dynamic behavior of an elastic coupler of a four-bar mechanism is investigated. The governing equation is nonlinear, partial differential equation with time-varying parameters. Perturbation method is employed to linearize the equation and the dynamic response is obtained using a closed-form numerical solution algorithm constructed through the discretization of the parameters continua. The dynamic stability of the system is evaluated based upon Floquet Theory. The results are presented in the form of parametric stability charts, and the dynamic stability analysis results were validated by a direct-integration method. The response become unstable at several bands of frequency. The effects of external force, damping and ratio of follower-to-coupler mass were examined. Results show that increase in tensile force, damping, and the mass ratio increased the stability of the elastic coupler.
CIRI GETARAN MEKANIK DAN ARUS CATU PADA MOTOR LISTRIK INDUKSI 3-FASA AKIBAT EKSENTRISITAS CELAH UDARA Nurhadi, Indra; Mahyuddin, Andi Isra; Ahmarudin, M
Mesin Vol 16, No 1 (2001)
Publisher : Mesin

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Abstract

This paper discusses theoretical and experimental study to determine the signature of stator supply current and stator vibration of 3-phase induction motor resulting from airgap eccentricity. Based on the theoretical study it can be formulated that the signature due to eccentricity is affected by number of slots on the rotor and the stator as well as slip, defined as “Principal Slot Harmonics (PSH)” and “Dynamics Eccentricity Components (DEC)”. To study its feasibility for practical use a set of experiments was performed and the predicted signature was identified. Using the test rig, it was demonstrated that the magnitude of PSH and DEC in stator current and body vibration increase due to eccentricity.
Co-Authors A.A. Ketut Agung Cahyawan W Ahmarudin, M Andhika Dhaniswara Boestaman, Refrizal Edgar Buwana Sutawika F. Ferryanto Ferryanto, F Golfianto, Hari Herman, Indria I. Indrawanto Mihradi, Sandro Nurhadi, Indra Santosa, Sigit Puji Satrio Wicaksono Suharto, Djoko Sunoto, Febrianto Guntur Tatacipta Dirgantara, Tatacipta