Lab 10 - Year 2010 Month 12 Day 5 Measurement of Vibration...

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Year 2010 Month 12 Day 5 Measurement of Vibration Signal and Signal Processing (Beam Vibration) MAE 309: AEROSPACE ENGINEERING LABORATORY II Name: Martin Suhartono Student ID: 20106182
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1. Objective The characteristics of signals obtained in experiments can be understood through a variety of signal processing. In this experiment, we will look into different basic signal processing techniques. We will examine the vibration characteristics of the aluminium experiment specimen, using the shaker, the function generator, laser displacement sensor and other equipment. 2. Experiment Equipment 1. Function Generator (F/G) 2. Oscilloscope 3. Aluminium Specimen 4. BNC-BNC cable 5. Laser Displacement Sensor 6. Shaker 7. Shaker Amplifier 3. Experiment introduction 3.1. Laser Displacement Sensor The laser displacement sensor is designed to measure the distance between the reflector and the sensor using the reflection of the laser. The equipment varies according to the measuring distance and accuracy. Model LK-081 LB-301 Standard Distance 80mm 300mm Measurement Range ±15mm ±100mm Degradability 3μm 50μm Output Voltage ±5V (3mm/V) ±5V (20mm/V) 3.2. Shaker (Vibration Exciter) We require a vibration exciter or shaker to produce real vibration in the lab environment. There are three types of vibration excitors: mechanical, electro-dynamic, and electro-hydraulic. The most widely used is the electro-dynamic type as it has the broadest frequency bandwidth, and it is easy to control as it operates by converting electric signals to dynamic movements. It is also able to realise various vibration conditions such as sine, random and shock. The specifications of the model used in this experiment are as follows: Model PM50A Output power 50 lb peek Displacement ± 0.5 in peek Speed 70 in/s peek Acceleration 80 g peek Available frequency DC 10000Hz
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4. Experiment Outline 4.1. Vibration Measurement 4.1.1. What is vibration? Vibration is when an object is repeating the same movement at a base location. The number of complete movement cycles per second is called frequency (Hertz, Hz). The movement may be composed of singularity with one frequency like a tuning fork, or it may be composed of many elements induced by different frequencies at the same time, like the piston movement in an internal-combustion engine. In reality, vibration signals are composed of many frequencies taking place at the same time, so it is not possible to know how many elements are involved in the relationship between amplitude and time, or on which frequency the vibration is taking place. These elements can be illustrated by drawing the amplitude according to the frequency. The process in which vibration signals are separated according to the frequency elements is defined as a frequency analysis. And this is the basic technology to measure and interpret vibrations. We can pursue the
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This note was uploaded on 03/19/2012 for the course AEROSPACE MAE309 taught by Professor Kwonsejin&hyunchulshim during the Spring '12 term at Korea Advanced Institute of Science and Technology.

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Lab 10 - Year 2010 Month 12 Day 5 Measurement of Vibration...

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