2023년 4월 26일 수요일

BISOPE series 35 The frequency range of the sensormeans the degree of f...


BISOPE series 35- The frequency range of the sensor(means the degree of frequency response accuracy)

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In selecting a transducer, the most important priority would be sensitivity and 'Frequency range'.

To explain the vertical axis in the graph of amplitude and frequency, it would be nice if one sensor could measure all amplitudes, but it can never be done because it depends on the sensitivity. To explain the horizontal axis in this way, if all sensors can measure all frequencies, there is no reason to select a sensor. This is because each type of vibration sensor, further subdivided, each type of vibration sensor (including an acceleration sensor) has its own frequency range of an area where measurement is accurate. This is called the frequency range.

 

Frequency range

The sensor indicates the range of measurable frequencies (e.g., acceleration sensor: 0.5 to 10 kHz), and the definition of this range is slightly different depending on the user, so that the maximum and minimum frequency ranges corresponding to the 'accurate zone' of the measurement can be selected. This frequency range is 'a reliable area where the sensor can output a properly matched signal; It means 'the range of frequency response accuracy according to the frequency sensitivity deviation', and although the meaning is slightly different from the non-linearity of the sensor, this reliable area can be expressed as a linear area.

Looking at the criterion of error amplitude related to the frequency domain, select the rate of change of the amplitude limit that can be judged by the presence or absence of an error, eg) ±3dB, ±5%, ±10%, etc., and the applicable frequency at this time is ..........

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

73 센서의 Frequency range주파수응답 정확성의 정도를 의미하는 구역v2


센서의 Frequency range, 주파수응답 정확성의 정도를 의미하는 구역

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센서(transducer)를 선택함에 있어 중요한 순위를 따진다면 단연 감도(sensitivity)와 'Frequency range'일 것이다.

진폭과 주파수의 그래프에서 세로축을 설명하자면, 하나의 센서가 모든 진폭을 측정할 수 있다면 좋겠지만 감도에 따라 다르기 때문에 절대로 그렇게 할 수 가 없다. 이와같이 가로축을 설명하자면 모든 센서가 모든 주파수를 측정할 수 있다면 센서를 선택해야 할 이유도 없다. 이런 이유로는 진동센서 종류별, 더 세분화해서 각 진동 센서(가속도센서도 포함) 종류별로 고유하게 측정이 정확한 구역의 주파수 구간이 각기 있기 때문이다. 이 것을 Frequency range라고 한다.

Frequency range (주파수영역)


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

관련 Tag

#진동센서, #가속도센서, #Acceleration, #Accelerometer, #압전효과, #압전소자, #Piezo, #ICP, #센서주파수범위, #센서선형성, #센서감도, #센서고유주파수, #모니터링시스템, #진동진단, #진동교육

2023년 4월 12일 수요일

BISOPE series 34 Regarding the selection of units for vibration amplitu...


BISOPE series 34- Regarding the selection of units for vibration amplitude (displacement, velocity, acceleration)

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When you want to measure vibration, you need to think in advance what unit you need to calculate it. This is in line with what needs to be tailored to the unit to be evaluated and what kind of sensor to select. Therefore, when expressing the amplitude of vibration as a unit, you need to know more rules than you think so that you can communicate knowledge with each other.

 

That is, different amplitude units are used depending on the object to be measured (building, person, machine), main frequency (low frequency, high frequency), or target of interest in the result (stress, energy, power). can never be unified. This is because different units are used in written standards for evaluation, reference standards, measurement standards, specifications, regulations, and laws.

 

Choose between displacement, velocity, and acceleration

 

Displacement, velocity, and acceleration can be converted to ..................................

 

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

#PDM; Resonance analysis, #frequency analysis, #CBM, #vibration sensor, #vibration and noise education

 


72 진동의 진폭 변위, 속도, 가속도의 단위 선택에 관하여


변위, 속도, 가속도 중에 선택

변위와 속도 그리고 가속도는 서로 미적분을 통해서 변환이 가능하다. 그런데 실질적으로 일방적인 방법으로만 활용된다. 일반적으로 가속도센서를이용하여 속도로 적분변환하여 평가할 수 있지만 변위를 통해 미분하여 속도로 평가하지는 않는다. 이 것은 변위센서의 약점때문이다.

다음은 변위와 속도 그리고 가속도의 용도와 주요 범위를 설명하였다. 왜? 변위를 사용하는지... 왜? 속도로 평가하는지... 왜? 가속도는 그렇게 많이 사용하는지를 이해하기 바란다. ...............


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