2023년 5월 31일 수요일

BISOPE series 39 Gear frequency 5 Causes of gear vibration external an...


BISOPE series 39- Gear frequency-5- Causes of gear vibration (external and internal defects)

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The gearbox is one of the mechanical elements (belt, chain, etc.) that transmits power to the driven part by changing gears, and its biggest feature compared to other similar elements is that it can transmit strong torque. Therefore, places that require strong torque at low speeds with high-speed power are mostly places that receive strong loads. The gearbox is particularly used as a reducer for cement traction and crushing, tire crushing and extrusion, and frequent power transmission of trains. On the other hand, gearboxes used for high-pressure discharge in gas production are sometimes used for rotational change as gearboxes. If you look again, you can see that the gearbox is never a mechanical element that can be used alone. So vibration occurs.

Causes of gear box vibration

All Gear Boxes are connected to other machines. Therefore, it is heavily influenced by it. However, there are also problems with the gear itself, for example, gear vibration occurs due to misalignment of the pitch line, eccentricity, or inconsistency between tooth intervals. Internal defects of the Gearbox itself and external defects affecting the Gearbox are summarized as follows.

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

#gear vibration, #gearbox, #bearing vibration, #sideband, #GMF, #gear #meshing #frequency, #gearbox with misalignment, #electrical vibration, #harmonic, #vibration measurement, #resonance analysis, # Vibration education, #resonance measurement, #frequency analysis#vibration diagnosis, #facility diagnosis


77 Gear frequency 5 기어의 진동원인들외부결함, 내부결함v2


Gear frequency-5-기어의 진동원인들(외부결함, 내부결함)

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기어박스는 변속을 하여 피동부에 동력을 전달하는 기계요소(벨트, 체인 등)중의 하나로서 다른 유사 요소와 가장 큰 특징은 강한 토오크를 전달할 수 있다는 것이다. 따라서 고속의 동력으로 저속의 강한 토오크를 필요로 하는 곳은 대부분 강한 부하를 받는 곳이다. 기어박스는 특히 시멘트의 견인 및 파쇠, 타이어의 파쇠 및 압출, 열차의 빈번한 동력전달 등에서 감속기로 활용된다. 반면에 가스생산의 고압 토출에 사용되는 기어박스는 증속기로서의 회전변경을 위해 사용되는 경우도 있다. 다시 한번 살펴보면 기어박스는 절대로 홀로 움직여서 활용될 수 있는 기계요소가 아닌 것을 확인할 수 있다. 그래서 진동이 발생한다.


기어결함 진동결함-kcbm.kr

Gear box의 진동원인

모든 Gear Box는 다른 기계들과 연결되어 있다. 따라서 그로부터 많은 ......


https://blog.naver.com/vs72

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

키워드

#기어진동, #기어박스, #베어링진동, #사이드밴드, #GMF, #기어 #맞물림 #주파수, #축정렬불량인 기어박스, #전기적진동, #하모닉, #진동측정, #공진분석, #진동교육, #공진측정, #주파수분석


2023년 5월 24일 수요일

BISOPE series 38 Instrument level difference between Vibrometer vibrati...


BISOPE series 38- Instrument level difference between Vibrometer (vibration meter) and FFT (frequency analyzer; multi-channel vibration analyzer)

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Unlike temperature measurement, where you can select only Celsius or Fahrenheit and press a button, you need to know a lot about 'vibration' before measuring. How to select units and how far is the frequency range? What are the types of sensors and how to attach them? Also where? in which direction? Everyone should know how to measure. As a metaphor, 'knowledge is something that is easy for those who know it, unlike wisdom that is difficult even if you know it.' If you know about the vibration, it is easy to measure the selectivity of the instrument.

 

Distinct difference between vibrometer (vibrometer and frequency analyzer FFT vibration analyzer)

 

Recent vibrometers that can perform simple spectrum frequency analysis and trend storage are being sold at low prices, but in general, vibrometers do not have as precise or diverse functions as FFT (vibration frequency analyzer). Therefore, it is necessary to know the practical optimal knowledge that can identify these differences, and refer to the following.

 

item

vibrometer

Frequency analyzer (FFT, multi-channel vibration analyzer)

Appearance

output

Types and uses of instrumentation

Magnet-attached or probe-type machine surface vibration measurement, machine condition management

Select the number of simultaneous measurement channels, whether to measure FRF (resonance), machine diagnosis, long term recording (DAQ), rotor dynamics, front-end or hand held, for Labs and machine analysis

Sensor selection

-The magnet attached type is better than the probe stick type because measurement stability and high frequency are possible.

-Sensitivity modifiable instrument (high sensitivity, high impact measurement possible)

-Sensitivity modifiable instrument (high sensitivity, high impact measurement possible)

-For low frequency detection (using displacement sensor and DC sensor, or using acceleration of 500mV/g or higher)

 

-General type acceleration sensor (100mV/g)

 

-High impact acceleration sensor (10mV/g)

Unit

 

This data is very realistic and it is the result confirmed in the actual domestic industrial field, but it can be subjective and biased, so please refer to it.

 https://blog.naver.com/vs72

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

 

#vibration measurement, #vibration accelerometer, #sensor attachment method, #contact resonance frequency, #FFT, #vibrometer, #vibration sensor, #3 axis vibration, #frequency, #resonance, #resonance analysis, #resonance measurement, #frequency measurement, #vibration and noise education, #frequency analysis, #monitoring, #vibration measurement, #vibration diagnosis, #facility diagnosis


76 Vibrometer진동계와 FFT주파수분석기; 다채널 진동분석기의 계측기 수준 차이v2


Vibrometer(진동계)와 FFT(주파수분석기; 다채널 진동분석기)의 계측기 수준 차이

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섭씨, 화씨 만을 선택하고 버튼만 누르면 결과를 알 수 있는 온도의 측정과는 다르게 '진동(vibration)'을 측정한다는 것은 측정하기 전에 비교적 많은 것을 알고 있어야 한다. 단위는 어떻게 선택?하고 주파수 범위는 어디까지? 두고 센서의 종류와 부착방법은 어떻게? 또한 어디를? 어떤방향으로? 측정하는 지 등 모두 알고 있어야 한다. 비유하여 언급하건데 '알고 있어도 어려운 지혜와는 달리 알고 있는 사람에게는 쉬운 것이 바로 지식'이다. 진동에 대해서 알고 있다면 계측기의 선택도 측정도 쉽게 이루어 진다.


진동측정기의 분명한 차이(진동계 vibrometer와 주파수분석기 FFT vibration analyzer)

최근의 진동계로 간단한 Spectrum 주파수 분석과 Trend저장 등이 가능한 것도 저렴하게 판매되고 있지만 일반적으로 진동계는 FFT(진동 주파수분석기)처럼 정밀하거나 다양한 기능을 포함하고 있지 않다. 따라서 이러한 차이점을 확인할 수 있는 실용적인 최적의 지식을 알고 있어야 하는데 다음을 참조하도록 한다.

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

핵심단어

#진동측정, #진동가속도계, #센서부착방법, #접촉공진주파수, #FFT, #진동계, #진동센서, #3축진동, #frequency, #resonance, #공진분석, #공진측정, #주파수측정, #진동소음교육, #주파수분석, #모니터링, #진동측정, #진동진단, #설비진단