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Tri Wahyu Supardi
Department of Computer Science and Electronics, Universitas Gadjah Mada
Electrical & Electronics Engineering

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Sistem Deteksi Bentuk Kecacatan Benda Padat Menggunakan Teknik Variasi Sudut Ultrasonik Taufiq Nur Syahril Sidiq; Abdul Rouf; Tri Wahyu Supardi
IJEIS (Indonesian Journal of Electronics and Instrumentation Systems) Vol 6, No 1 (2016): April
Publisher : IndoCEISS in colaboration with Universitas Gadjah Mada, Indonesia.

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (825.949 KB) | DOI: 10.22146/ijeis.10773

Abstract

Making solid material frequent problems of  internal defect. This research intends to make a system to detect the form of defect in solid materials using ultrasonic waves. Components that was used in the system is a generator function, an op-amp,  ultrasonic sensor, oscilloscope and cylindrical solid material The method that used is reflected method of ultrasonic. Ultrasonic waves emitted from the transmitter to a solid material and the receiver will read a results of the reflection that occurs due to differences in medium objects. Oscilloscope will read of ultrasonic. Recitation will be done to determine the form of any cylindrical solid object.The trial system by a unit transmitter emits ultrasonic waves on the side solid material. A solid body rotated every  multiple 20˚ of 0-180˚  to get an angle variations. The result obtained that  waves as 40 khz can detect the form of solid material defect. The form of defect in a solid material has  different wave pattern. Constant wave patterns with small amplitudo is a cylindrical material without defect, constant wave patterns with more much amplitudo is cylindrical material with cylindrical defect also and wave patterns whose amplitudo is different in any variation angle is cylindrical solid with cubicaly defect.
Pengukuran Jarak Lubang Pada Benda Padat Menggunakan Sensor Ultrasonik Ivan Dwicahyo Pratomo; Abdul Rouf; Tri Wahyu Supardi
IJEIS (Indonesian Journal of Electronics and Instrumentation Systems) Vol 6, No 1 (2016): April
Publisher : IndoCEISS in colaboration with Universitas Gadjah Mada, Indonesia.

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1033.466 KB) | DOI: 10.22146/ijeis.10774

Abstract

 The process of making solid object in general, not print with good so that holes can’t be seen directly visually. NDT (Non Destructive Testing) is a method for detecting holes and the quality of solid objects without damaging solid object one uses ultrasonic to detect holes a solid object which there are on internal solid object. This research aims to design an instrument for measuring distances holes of solid body using ultrasonic sensor and oscilloscope.The method used for the testing is the echo pulse which produce output of the wave amplitude shown oscilloscope. Function generator as input pulses 40 KHz to circuit amplifier then the transformator strengthened and continued to ultrasonic transmitter. Transmitter generated pulse to object and the pulse has reflection because it has holes an internal object. The reflection pulse is received by the receiver ultrasonic sensor and amplified by signal amplifier circuit, then the wave displayed on oscilloscope. The research showed that the smaller distance holes testing the wave amplitude obtained becomes larger and when the distance holes a solid object is longer the attenuation coefficient value the greater worth. The value of measurement error in using a tool value made author of 5 %.
Sistem Kontrol Torsi pada Motor DC Arifin Wahid Ibrahim; Triyogatama Wahyu Widodo; Tri Wahyu Supardi
IJEIS (Indonesian Journal of Electronics and Instrumentation Systems) Vol 6, No 1 (2016): April
Publisher : IndoCEISS in colaboration with Universitas Gadjah Mada, Indonesia.

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (875.071 KB) | DOI: 10.22146/ijeis.10775

Abstract

The use of a DC motor in the industrialized world is very important. Speed of DC motor and torque of DC motor greatly affects quality and quantity of product. Therefore, we need control system of a DC motor that can be set speed and torque. The number of industry players complained about damage to the DC motor because transported load torque of motor exceeds capabilities of torque of DC motor. Based on these problem, we should make torque control system in DC motor.Torque control system made by regulating armature current of DC motor separately excited with current field  constant condition. Torque control system consist of speed control and current control, namely control system two level. Output signal speed control system will be the current reference signal.Testing has been carried out with a maximum load of 3690 grams and a nominal current of 0.8 A or nominal torque of 0.323 Nm. The results shows the effective torque of motor is able to be set in the range of 0.182 Nm - 0,243 Nm. Expected to value effective of regulated torque is able to withstand infinite heavy loads without damaging the motor.
Co-Authors Abdul Rouf Arifin Wahid Ibrahim Ivan Dwicahyo Pratomo Taufiq Nur Syahril Sidiq Triyogatama Wahyu Widodo