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Pemanfaatan Energi Putaran Roda Sepeda Motor untuk Menghasilkan Energi Listrik Jhon Malta; Fuadi Mustafa
METAL: Jurnal Sistem Mekanik dan Termal Vol 4, No 2 (2020): Jurnal Sistem Mekanik dan Termal (METAL)
Publisher : Department of Mechanical Engineering, Universitas Andalas

This research is conducted to convert the rotating energy of the wheel of a motorcycle as an alternative electricity power plant. The rotating wheel contacts a roller and then transmitted by belt to the generator. The generator generates the electric current and then converted using an inverter to produce alternating current (AC) with the voltage 220 volts. A battery is used to stabilize the output voltage. Based on the reference, the needed energy for the cell to charge is 13.0 volts to 13.9 volts. This tool can produce this voltage with 170 – 180 rpm of the wheel rotation, which is obtained in the gear 2 of the motorcycle Honda Supra X 125R.

Analisis Kerusakan Melalui Predictive Maintenance pada Main Drive Raw Mill Indarung II/III Lukman Alrasyid; Jhon Malta
METAL: Jurnal Sistem Mekanik dan Termal Vol 3, No 2 (2019)
Publisher : Department of Mechanical Engineering, Universitas Andalas

A main drive is an important mobilizing motor component in a raw mill. Due to the extremely condition of constant operation of the raw mill results in failure of the main drive. This disturbs the raw mix intake and halts the next processes. In order to observe and diagnose the cause of failure on the main drive, it is important to conduct a maintenance. The Predictive maintenance technique utilized in this research is the vibration analysis technique.The measuring process of the vibration is conducted through the use of transducer velocity in radial and axial directions on the drive and non-drive components of the RIM03 motor and the symetro gear. The vibration, spectrum, velocity, and speed of rotation are analyzed in the x-Viber. Based on the vibration measurement data, the root cause of vibration can be analyzed through spectrum velocity. In this research, the critical result is found at the LS symetro gear. The occurred problem on the LS symetro gear is caused by misalignment shaft on the symetro gear connecting to gear pinion. The solution which can be applied is heat treatment to the shaft, therefore misalignment can be reduced.

UJI PERFORMANCE MEJA GETAR SATU DERAJAT KEBEBASAN DENGAN METODE STFT Jhon Malta
Jurnal Teknik Mesin Vol 1 No 2 (2004): Jurnal Teknik Mesin
Publisher : Politeknik Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar

In this research, it has been constructed a prototype of vertical shaking table, then its performance is tested and analyzed using the vibration signal processing. From this vibration signal can be acquainted the response of shaking table. In theoretical, a degree of freedom of vertical shaking table will have a perfectly stationary signal at all times of measuring, in the other side in experimental, the response of this shaking table has some frequencies. When this signal is processed by using Fast Fourier Transform or FFT, it will result the frequency spectrum which appear like a stationary signal at all times of measuring, so the time of vibration in time domain that will be undetected. To overcome the lack of FFT method, the vibration signal can be analyzed by using the Short Time Fourier Transform or STFT method. The results of this method can be viewed in spectrogram. By using this method, the vibration of shaking table can be depicted that occur at certain time.

EFFECT OF A SCALED CANTILEVER BEAM ON NATURAL FREQUENCY Jhon Malta; Arif Gunawan; Lovely Son
Jurnal Rekayasa Mesin Vol. 14 No. 2 (2023)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v14i2.1266

This paper deals with the scaling factor's effect on the cantilever beam's natural frequency. Scaling a prototype dimension will make it easier to manufacture and test the dynamic characteristics of structures with enormous sizes. Natural frequency is one of the essential parameters of the vibration characteristics of the system. The phenomenon that often occurs in vibrating structures is the resonance phenomenon. Resonance is a system state in which an abnormally large vibration is generated in response to an external stimulus, happening when the frequency of the disturbance is equal to, or nearly identical to, the natural frequency of the system. This research investigates the scale factor on natural frequency using the analytical method using Euler-Bernoulli beam theory, the MSC Nastran/Patran software, and experimental testing using an impact hammer on a cantilever beam. The three methods were applied to beams with four scaling variations: 1:1, 1:2.04, 1:2.85, and 1:3.48. Based on the results, the natural frequencies increase by the size scale reduction value in the modeling. The natural frequency value in the actual structure has a value equivalent to 1/S of the natural frequency value of the scale, whereas S is defined as the downgrade scale value. This result follows the Similitude theory.

Effects of a Longitudinal Crack in Overhung Rotor Malta, Jhon; Bur, Mulyadi; Fadillah, Muhammad Rahmanda
Andalasian International Journal of Applied Science, Engineering and Technology Vol. 2 No. 1 (2022): March 2022
Publisher : LPPM Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/aijaset.v2i1.33

In this study, a longitudinal crack simulation will be carried out on the shaft using the MSC Nastran/Patran to identify the effect of variations in the depth and length of the crack on the shaft on the stress distribution along the shaft and to determine the dynamic behavior of the rotor shaft overhung system due to cracks. The simulation was carried out with two models, with and without a crack. The first crack position locates between the disk and the bearing, and the second is between the two supports. Based on the simulation test results, the natural frequencies tend to decrease with increasing variations in the depth and length of the crack, especially at first and second natural frequencies. The cracks between the disc and the bearing significantly reduce stiffness than the cracks between the two supports. Furthermore, in the stress analysis, the cracks increase the rotor's maximum stress, which occurs in the area of the ultimate bending moment.

Effects of a Longitudinal Crack in Overhung Rotor Malta, Jhon; Bur, Mulyadi; Fadillah, Muhammad Rahmanda
Andalasian International Journal of Applied Science, Engineering and Technology Vol. 2 No. 1 (2022): March 2022
Publisher : LPPM Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/aijaset.v2i1.33

In this study, a longitudinal crack simulation will be carried out on the shaft using the MSC Nastran/Patran to identify the effect of variations in the depth and length of the crack on the shaft on the stress distribution along the shaft and to determine the dynamic behavior of the rotor shaft overhung system due to cracks. The simulation was carried out with two models, with and without a crack. The first crack position locates between the disk and the bearing, and the second is between the two supports. Based on the simulation test results, the natural frequencies tend to decrease with increasing variations in the depth and length of the crack, especially at first and second natural frequencies. The cracks between the disc and the bearing significantly reduce stiffness than the cracks between the two supports. Furthermore, in the stress analysis, the cracks increase the rotor's maximum stress, which occurs in the area of the ultimate bending moment.

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