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Asmara Yanto
Institut TeknologiPadang

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Microstructures Changes in Aluminum 6061 Due To Oxidation before MMAW Welding Anrinal Anrinal; Asmara Yanto; Rahmad Hidayat
Jurnal Teknik Mesin (JTM) Vol 10, No 1 (2020)
Publisher : LP2M - Institut Teknologi Padang

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Abstract

This work aims to provide an overview of the changes in the microstructure of Aluminum 6061 because it was oxidized prior to MMAW welding. The research was conducted by first allowing aluminum 6061 to oxidize in the air (atmosphere) with a time variation of 0, 120, and 240 hours. The MMAW welding process uses a 1G welded seam without a 1G position, Grilumin 14 electrode, AWS A5.3-99 specifications, E4043 3.2 mm in diameter, with a DC current of 90 Amperes. The welding results show that the weld surface appears sooty and rough spots where the longer the oxidation occurs produces more soot and spots, while the results of the microstructure examination on the weld area and the HAZ area show that the micro structure of the weld area and the HAZ area experiences increased grain size.
Flexural Free Vibration of a Straight Vertical Cantilever Beam Asmara Yanto
Jurnal Teknik Mesin (JTM) Vol 8, No 1 (2018)
Publisher : LP2M - Institut Teknologi Padang

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Abstract

In this paper, flexural free vibrations of a straight vertical cantilever beam have been modeled and simulated. Here, a modeled cantilever beam has modulus of elasticity, moment of inertia, cross-section and density are constant. Motion equation of a modeled cantilever beam are separated become two Partial Differential Equations; one depends on position and another on time. This technique yields the motion equation of a modeled cantilever beam contains two functions; one defines deflection shapes and another defines amplitude of vibrations within time. The deflection shapes are described for first five natural frequencies of a modeled cantilever beam. Furthermore, the motion equation of a modeled cantilever beam is solved by using Fourier series. From simulation of a modeled cantilever beam with 2 GPa modulus of elasticity, 2.67x10-8 m4 moment of inertia, 8x10-4 m2 cross-section, 7862.30 kg/m3 density, 1 m length, and 100 N initial load obtained 16.29, 102.11, 285.95, 560.36, and 926.22 rad/s first five natural frequencies respectively.
Experimental Study of Vibration of Shaft-Rotor System Due to Imbalance Asmara Yanto; Rozi Saferi
Jurnal Teknik Mesin (JTM) Vol 7, No 2 (2017)
Publisher : LP2M - Institut Teknologi Padang

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Abstract

In this study, vibration of shaft-rotor system as a part of rotating machinery prototype due to imbalance has been monitored, processed and analyzed by a dynamic signal analyzer virtual instrument (DSA VI). The rotating machinery prototype consists of an AC induction motor, a pulley-belt system, and a shaft-rotor system supported by two bearings. Two discs were placed between two bearing housings. On both discs are added and placed additional mass as unbalance mass on shaft-rotor system. Unbalance mass placement is varied with different of angle orientations i.e. 0o, 30o, 60o, 90o, 120o, 150o and 180o between on both discs. DSA VI consists of four micro-electro-mechanical system (MEMS)-based accelerometers type ADXL335 that placed on the bearing housings, a data acquisition device and a data analyzer device. The four accelerometers serve to convert the mechanical quantities of measured vibration acceleration into electrical quantities in mV. Vibration signal in mV is acquired by the data acquisition device. Data sampling rate is set at control panel of the data analyzer device. Measurable vibrations in the time domain are displayed by the data analyzer device in a computer. Vibration in time domain is transformed into frequency domain by using fast fourier transfrom (FFT) method. From this experimental study of vibration of shaft-rotor system due to imbalance obtained the highest vibration amplitude for unbalance mass placement with different of angle orientation is 30o between on both discs. If unbalance mass placement with different of angle orientation is greater than 30° between on both discs, then amplitude of vibration due to imbalance will decreases.
Basic Dual-Arm Manipulator Kinematics Using Forward Kinematics Method and Aided by Autodesk Inventor Asmara Yanto
Jurnal Teknik Mesin (JTM) Vol 8, No 2 (2018)
Publisher : LP2M - Institut Teknologi Padang

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Abstract

This work aims to simulate the kinematics of a basic dual-arm manipulator by using the forward kinematics method and aided by the Autodesk Inventor software. Dual-arm manipulator consists of 7 joints and 6 links. One base link, one shoulder link, two right arm links and two left arm links. Each link is designed with the following length: 310 mm length of link base, 580 mm length of shoulder link, 280 mm length of the first right arm link and left arm link, 222 mm length of the second right arm link and left arm link. The degree of freedom of the dual-arm manipulator is five rotations (5R), namely R1 for base link and shoulder link, R2 for the first left arm link, R3 for the second left arm link, R4 for the first right arm link and R5 for the second right arm link. Parts and assembly of the dual-arm manipulator are designed with Autodesk Inventor. Dual-arm manipulator motions were simulated in two types of trajectory planning. From the simulation for both trajectory planning, the positions of ended left arm and right arm for each step of trajectory planning were visualized and defined.
Kinematic Analysis of A 4-Axis Manipulator Design with 2-Axis Gripper Asmara Yanto; Rozi Saferi; Anrinal Anrinal; Fikri Azhar
Jurnal Teknik Mesin (JTM) Vol 9, No 1 (2019)
Publisher : LP2M - Institut Teknologi Padang

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Abstract

The purpose of this work is to analyze the kinematic of a manipulator that was designed to has four revolute movements (R1, R2, R3 and R4) and is equipped with a gripper that has one revolute movement (R) and one prismatic movement (P). The analysis was conducted by varying R1, R2, R3 and R4 of manipulator and R and P of gripper. Kinematic analysis was carried out using the Forward Kinematics method based on DH-Parameters of manipulator and gripper. Manipulator was designed to be consist of 120 mm of Link-1, 200 mm of Link-2, 250 mm of Link-3 and 250 mm of Link-4. Revolute movements range of manipulator was designed for variation of R1, R2, R3 and R4, and with movements range of gripper for variation of R and P. From this work can be concluded that manipulator has 228.5 mm of minimum range radius of end-effector and 547.0 mm of maximum range radius of end-effector.
Android-Based Control System of Lawn Mower Using Bluetooth Connection Asmara Yanto; Anrinal Anrinal; Prasetyo Subekti
Jurnal Teknik Mesin (JTM) Vol 10, No 1 (2020)
Publisher : LP2M - Institut Teknologi Padang

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Abstract

The purpose of this research is to build and test the android-based control system of lawn mower using Bluetooth connection. The lawn mower has 4 DC motor actuators, where a DC motor for moving the rear wheels that serves to move the lawn mower back and forth, a DC motor to drive the front wheels that serves to turn the lawn mower, a DC motor to adjust the cutting blade elevation and a DC motor for turning the cutter blade. The four DC motors are controlled by a Arduino. The command or input to control the motion of the mower is sent via Android with a bluetooth connection to Arduino. The lawn mower control system testing is carried out to cut the grass. From the tests was conducted, it can be concluded that the lawn mower control system works well.
A Simple Dynamic Signal Analyzer Virtual Instrument To Monitoring and Control Airflow Temperature Asmara Yanto; Anrinal Anrinal; Ryan Adi Pratama
Jurnal Teknik Mesin (JTM) Vol 6, No 2 (2016)
Publisher : LP2M - Institut Teknologi Padang

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Abstract

This work aims to present a Dynamic Signal Analyzer Virtual Instrument (DSA-VI) for monitoring and control the airflow temperature in a prototype of air duct. Here, the DSA-VI has developed by using LabVIEW software and Arduino UNO.  To investigate the performance of DSA-VI, an experiment has performed to monitoring and control airflow at settling temperature, 40oC, 50oC, and 60oC, respectively by using the DSA-VI. By assuming that an airflow temperature control system as the first order system, the time constant (t) should be inspected as one of the system characteristics. The testing at the settling and surrounding temperatures (Tsp and T0) are 40oC and 28.81oC respectively, obtained value of t is 7.49 s; at Tsp and T0 are 50oC and 29.88oC respectively, obtained value of t is 11.35 s; and at Tsp and T0 are 60oC and 28.81oC respectively, obtained value of t is 19.54 s. By using DSA-VI, the value of t at the transient response can be evaluated. At the steady state response, the airflow temperature has controlled well with the steady state error less than ± 2.5 %.
Design, Simulation and Kinematics Analysis of Robot Manipulator with PPRR Joints Configuration Asmara Yanto; Ahmad Jeni
Jurnal Teknik Mesin (JTM) Vol 9, No 2 (2019)
Publisher : LP2M - Institut Teknologi Padang

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Abstract

This research aims to create an innovation in the design of Robot Manipulator with joint configuration in the form of two prismatic movements and two revolute movements (PPRR), serially. The Robot Manipulator design is validated by performing kinematics simulation and analysis of a trajectory. To simulate the movement of this Robot Manipulator, the end-effector Robot Manipulator is equipped with stationery in the form of a marker to follow the trajectory of the block letters. Robot Manipulator consists of four links. Link-1 moves prismatically on a horizontal linear sliding rail system (LSRS) with a rail length of 450 mm. The center point of Link-1 can move from a position of 75 mm to 375 mm in the X-axis direction. The Y-axis parallel links with a length of 80 mm move prismatically on a vertical linear rail system (LSRS) with a rail length of 60 mm. The conditioned link-2 can move from 140 mm to 180 mm in the direction of the Z-axis. Link-3 revolves in the X-Y plane with a range of 0o to 180o. Link-4 revolves in the X-Y plane with a range of 0o to 180o. From the simulation and kinematics analysis of Robot Manipulator with trajectory in the form of ITP block letters it can be concluded that the Robot Manipulator is indicated to be able to follow the trajectory well.
Study of Experimental Vibration Due to Misalignment of Pulley-Belt in Rotary Machine Asmara Yanto; Anrinal Anrinal; Rozi Saferi; Zultri Memori
Jurnal Teknik Mesin (JTM) Vol 10, No 2 (2020)
Publisher : LP2M - Institut Teknologi Padang

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Abstract

This study aims to investigate the vibration of rotary machine due to misalignment of its pulley-belt, experimentally. Here, the rotary machine is driven by an AC motor with pulley-belt transmission that positioned on the outer portion of shaft-rotor. To generate vibration of rotary machine, pulley-belt is conditioned to have a combination of offset and angular misalignments. Offset misalignment variations are 0, 2, 4, and 6 mm and angular misalignment variations are 0ᵒ, 2ᵒ, 4ᵒ, and 6ᵒ. Vibration of rotary machine is measured on the bearing housing by use MEMS-based accelerometers. The measured signal of vibration acceleration is acquired with a data acquisition device to obtain vibration spectrum. From the investigation to vibration spectrum has been done, it can be concluded that vibration of rotary machine has characteristic with dominant frequencies at 1xRPM of shaft and at 1xRPM of motor. The vibration amplitude at 1xRPM of shaft is higher than the vibration amplitude at 1xRPM of motor. From this investigation, it is not possible to find differences in the characteristics of vibrations significantly that occur between vibrations due to offset misalignment, angular misalignment or their combination.
Development of Dynamic Signal Analyzer Virtual Instrument (DSA VI): A Research Proposal Asmara Yanto; Anrinal Anrinal
Jurnal Teknik Mesin (JTM) Vol 6, No 1 (2016)
Publisher : LP2M - Institut Teknologi Padang

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Abstract

At present, one of the maintenance types that is being developed is the predictive maintenance based on the mechanical signals obtained by performing the mechanical quantities measurements. In general, a mechanical signal is a dynamic signal where to acquire this signal, it is required a dynamic signal analyzer (DSA) instrument.  However, the availability of DSA instruments in the market is limited in functionality and specification and also high cost. Therefore, in this work, a DSA instrument in the form of computer-based virtual instrument (DSA VI) would be developed. The DSA VI would designed by using the LabVIEW software and an Arduino UNO hardware. It is hopefully that the developed DSA VI capable to acquiring, processing, displaying, storing and reading the measured mechanical signals.