BISOPE series 85 Measurement and comparison of absolute and relative vi...

BISOPE series 85- Measurement and comparison of absolute and relative vibration--------------------------------------------------------

A shaft is a rotating body (Rotor) supported on the bearing of a casing (housing). As this shaft rotates, vibration may occur due to centrifugal force such as mass imbalance, or there may be vibration transmitted from the bearing. Then, what kind of vibration does the shaft vibration sensor installed by attaching to the casing to measure the vibration of the shaft measure? Does it always measure only the vibration of the shaft shaking? What if the sensor itself shakes.....? For example, if an earthquake occurs and vibration is transmitted to the shaft from the foundation to the casing and through the bearing, is the vibration of the stationary shaft dangerous? In reality, the shaft is not even rotating.....

 

Absolute vibration and relative vibration

 

Reference) Definitions and evaluation methods related to relative vibration and absolute vibration are well explained in ISO7919.

 

Key! Vibration Standard, ISO, Vibration Evaluation, Acceleration, Displacement, Absolute Vibration, Shaft Contact Vibration, Relative Vibration

#vibration education, #frequency analysis, #resonance measurement#vibration measuring instrument, #frequency setting, #Fmax, #maximum frequency, #sampling frequency, #sampling rate, #FFT, #3-axis vibration sensor, #acceleration sensor, #vibration education, #building vibration, #vibration measurement, #resonance analysis, #resonance measurement, #vibration monitoring, #vibration noise consulting  www.kCBM.kr,   https://blog.naver.com/vs72 , https://contents.premium.naver.com/bisope/visope

BISOPE series 84- Accelerometer calibration method----------------

Accelerometer is the most commonly used sensor for vibration measurement. It converts the vibration unit (displacement, velocity, acceleration) into a value (voltage, current) proportional to acceleration and outputs it, so it is also called ‘Acceleration pick up’ or ‘Transducer’. When purchasing a new acceleration sensor, you receive data on the calibrated sensitivity from the manufacturer and input the data into the measuring instrument (FFT, Machine analyzer) to measure it. The standard sensitivity is 10mV/g, 20, 100, 200, 1000, etc., and the calibrated sensitivity is indicated as 0.97mV/g, 19.8, 99,197, 998.5, etc. Even if it does not significantly violate the error of general measurement, calibration is absolutely necessary for precise measurement.

 

Accelometer calibration

 

There are many reasons for errors in measurement r............................

 

Key! Vibration sensor, acceleration sensor, Acceleration, Accelerometer, Calibration

#vibration education, #frequency analysis, #resonance measurement#vibration measuring instrument, #frequency setting, #Fmax, #maximum frequency, #sampling frequency, #sampling rate, #FFT, #3-axis vibration sensor, #acceleration sensor, #vibration education, #building vibration, #vibration measurement, #resonance analysis, #resonance measurement, #vibration monitoring, #vibration noise consulting  www.kCBM.kr,   https://blog.naver.com/vs72 , https://contents.premium.naver.com/bisope/visope

 

122 가속도센서의 교정방법

가속도센서의 교정방법 (Accelerometercalibration)

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가속도센서는 진동측정에 가장 많이 사용되는 센서로서 진동의 단위(변위, 속도, 가속도) 중에서가속도에 비례하는 값(전압, 전류)으로 변환 출력해 주므로 ‘Acceleration pick up’, ‘Transducer’로불리우기도 한다. 가속도센서를 신규로 구매하면 제작사에서 교정된 감도(Sensitivity)가적힌 자료를 함께 받아서 계측기(FFT, Machine analyzer)에 그 자료를 입력하여 측정하게된다. 이미 정해진 보통의 감도는 10mV/g, 20, 100, 200,1000등이며 교정된 감도는 예를 들어 0.97mV/g, 19.8, 99,197, 998.5등으로표기된다. 일반적인 측정의 오차에 크게 위배되지 않을지라도 정밀측정에는 반드시 교정(Calibration)이 필요하다.

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키워드	진동센서, 가속도센서, Acceleration, Accelerometer, 교정, Calibration

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VISOPE-진동소음 공진 변위 측정/분석/모니터링/교육 : 네이버 블로그

진동/소음/공진/변위/동하중/측정/결함원인/진동분석/건물진동소음/회전기계/구조진동/진동모니터링/공진분석/고유주파수/FFT/설비진단/조기결함/주파수분석/방진방음/플랜트설비/건물진동/공사장건설도로철도/계측장비센서/무선/진동소음센서/음향방출,SDT/ PDM,CBM,VMS,CMS/기계-구조-배관-건물-공사장-철도/모니터링시스템,MODAL/ODS/진동자격/기술자문/연구심의/교육강의/소음진동기술사/BISOPE/VISOPE,......www.kcbm.

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All copyright 한국CBM written by BISOPE , vs72@naver.com, 070-4388-0415, www.kCBM.kr

 

[한국CBM(주)-진단모니터링 - 홈] 상태측정분석, 특성화 모니터링시스템, CBM진동교육.... CBM 종합솔루션...한국CBM

분석진단(진동소음)기술컨설팅+CBM모니터링시스템+교육

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BISOPE series 60- Voice vibration (singing well...)

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I am curious about how you are improving your voice so that you can sing well for various reasons today. Some may be eating raw eggs, while others may be wearing warm towels around their necks. Because each person has their own secret. Let's consider whether the secret to making your voice sound great and like practice can be physically explained.

 

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BISOPE series 61 Measurement direction and location of vibration sensor...

BISOPE series 61- Measurement direction and location of vibration sensor (casing type) (selection method)

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Even if there are measuring instruments and vibration sensors, if you want to measure the vibration of a target structure or facility (machine), where and in what direction should you attach the sensor and acquire data? It can be overwhelming. In fact, there must be prior knowledge with a lot of theoretical and empirical basis. Selection and setting of measuring instruments and sensors are important, but data that is not measured in the right location becomes the basis for error diagnosis. To summarize, the answer would be ‘a point where the highest vibration state (position, direction, behavior) can be read well, so evaluation is possible and it is safe.’

 

How to select a vibration measurement location

#Vibration sensor, #Acceleration sensor, #Acceleration, #Accelerometer, #Vibration measurement direction, #Vibration measurement location, #Horizontal, #Axial, #Inboard, #Coupling, #Rotating machine…….. www.kCBM.kr,   https://blog.naver.com/vs72 , https://contents.premium.naver.com/bisope/visope

99 진동센서접촉형의 측정방향과 위치 선정방법

진동센서(접촉형)의 측정방향과 위치 (선정방법)

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계측기와 진동센서가 있더라도 막상 대상 구조 또는 설비(기계)의 진동을 측정하자고 하면 어떤 위치에 어떤 방향으로 센서를 부착하고 또 데이터를 취득해야 하는 것인가? 막막할 수 있다. 여기에는 사실 많은 이론적이며 경험적인 근거가 있는 선행지식이 있어야 한다. 계측기나 센서의 선택과 설정도 중요하지만 제 위치에 측정이 되지 않은 데이터는 오류진단을 내기에 근거가 되기때문이다. 줄여서 답을 말해보라면 ‘최고진동상태(위치, 방향, 거동)를 잘 읽을 수 있어서 평가가 가능하고 안전한 지점’이라면 정답일 것이다.

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92 부하측DE과 반부하측NDE 센서부착v2

진동센서의 측정방향과 위치 (부하측, 반부하측)

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NDE측 Horizontal진동이 높다고 합니다. 어디를 보아야 할까요?

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회전기계의 구성요소를 살펴보면 우선 원동부(구동부)측과 피동부(피구동부)측, 그리고 그를 연결시켜 주는 커플링(직결 및 완충식, 벨트 등)으로 구분할 수 있다. 그리고 또 하나의 연결요소라 하면 별도의 커플링이 추가로 필요한 기어박스가 있을 수 있겠다. 각 구성요소는 모두 연결되어 같이 회전하는 기계이므로 속도는 다를 수 있어도 진동은 서로간에 전달되며 어느 하나의 연결부품이 잘못되거나 정렬이 잘 되어 있지 않으면 전체 기계(설비)가 진동의 영향을 받게 된다. 따라서 어느 위치의 진동이 어떠한가?를 정하는 것은 매우 중요한 약속이다. 이 중에서 DE, NDE가 무엇인지는 반드시 알고 통해야 할 단어다.

DE, NDE-visope

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DE, NDE와 Outboard, Inboard

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설비의 위치를 호명하는 것은 전체설비의 진동평가가 최고 진동점의 값으로 이루어지기도

#3축 진동센서, #가속도센서, #Acceleration, #Accelerometer, #진동측정방향, #진동측정위치, #Horizontal,# Axial, #Inboard, #커플링, #회전기계,# DE, #NDE,#부하측, #반부하측,# Inboard, #Outboard, #진동교육, #공진측정, #공진분석, #FFT