T.E. 201

http://www.substech.com/dokuwiki/doku.php?id=laser_peening Laser peening is a cold work process, in which the metal part is struck by a high energy pulsed laser beam producing high amplitude stress waves. The surface material resists to stretching induced by the stress waves resulting in a formation of a compression stressed skin. A typical laser system used for laser peening has the following p..

http://www.substech.com/dokuwiki/doku.php?id=forging Forging is a compressive metal forming process, involving shaping a metal piece by hammer, press or rolls. § Hammer forging (drop forging) is forming a preheated workpiece by using impact energy of the falling hammer forcing the metal to fill the space between the punch (a part attached to the hammer) and the forging die (a part attached to th..

Extrusion is a metal forming process involving shaping a metal billet (hot or cold) by forcing it through a die with an opening. The two possible schemes of extrusion are presented in the picture: The metal billet is placed to the container of the extrusion press. The die with an opening is mounted at the end of the container. When the hydraulically driven ram presses the billet, the metal start..

Drawing is a metal forming process involving pulling a workpiece (cold or hot) through a die providing reduction of the cross section of the workpiece. The drawing process employs a series of dies with opening of similar shape and of size which is slightly reduced in each consequent die. As the cross section decreases after passing each die, the length of workpiece increases, requiring correspon..

http://www.substech.com/dokuwiki/doku.php?id=deep_drawing Deep drawing is a cold metal forming process, in which a flat metal blank is forced into a die cavity by hydraulically driven punch. A cup-like cylindrical part, having the depth greater than its diameter, is formed as a result of deep drawing. The process is presented in the picture: Typical stages of a deep drawing process are as follow..

Burnishing http://www.substech.com/dokuwiki/doku.php?id=burnishing Burnishing is a cold working process in which the surface layer of a work piece is plastically deformed by a hard tool: either roller or sliding ball. Benefits of burnishing The surface of a machined part has a profile composed of alternating irregular micro-asperities (peaks)and micro-valleys. The roughness level of the surface ..

1. 캐리어(Carrier) 관련 여러 용어들 ㅇ [통신 일반] 반송파 (搬送波) > 변조, 주파수천이, 주파수분배현황 - 정보가 포함되어 변조되는 높은 주파수의 파형을 말함 . 통상 대역폭을 갖으므로, 반송파 주파수를 가리킬 때는, 중심 주파수를 씀 ㅇ [통신 변조/전송 방식] - 억압 반송파 변조방식 > DSB-SC . 전력 소모가 큰 반송파를 억제하는 진폭변조 방식 - 단일이 아닌 여러 반송파를 함께 사용 > 다중 반송파 전송방식, 부반송파 ㅇ [LAN] 반송파의 감지 > Carrier Sensing - 유선 LAN,무선 LAN 통신에서 공유매체의 사용 여부를 감지하는 기능 ㅇ [사업자 구분] 사업자로서의 캐리어 > ILEC, CLEC, IXC 등 - 전화 사업자의 의미도 있음 ㅇ [도체/반도체] ..

Simple Vibration data processing using python codePython is powerful tool. due to very useful moduls. Sensor : Acceleration sensorOperation : 60Hz, Normal(Balancing & alignment)Vibration Simulator (Normal) Code rate,data = wave.read('01.wav') spectre = np.fft.fft(data) freq = np.fft.fftfreq(data.size, 1/rate) mask=freq>0 plt.plot(freq[mask],np.abs( spectre[mask])) datacursor() plt.show() Resulty..

Piezoelectric Accelerometers: Mysteries On How They Work... Revealed!It's time to reveal the mystery behind the accelerometer type you typically use in vibration and shock testing!There are many different types of accelerometers, but piezoelectric accelerometers are the most popular for vibration and shock measurement. In this post, I'll discuss how piezoelectric accelerometers work, the benefit..

Load in a two column CSVPlot all dataCompute and plot the moving 1 second RMS levelCompute and plot a FFT파이썬일반적으로 파이썬 은 자유롭고, 오픈 소스이며, 다양한 기능을 제공합니다. 그들의 NumPy와 및 SciPy 패키지는 MATLAB과 유사한 기능을 가지고 있습니다. Python은 MATLAB에 비해 매우 우아하고 직관적 인 프로그래밍 언어입니다. 읽기 쉬운 일반 언어로 작성되었습니다. 그리고 그들은 그것으로 확실히 성공했습니다! 파이썬은 데이터 분석 외에도 다른 프로그래밍 요구를 위해 MATLAB보다 나은 대안으로 보편적으로 받아 들여집니다. MATLAB반면에 MATLAB 은 선형 대수 연산을 위해 특별히 개발되었..