BISOPE series 68 Relationship between vibration and noise and frequency

BISOPE series 68- Relationship between vibration and noise and frequency ------------------------------------------------------------------------------ The reason why we can distinguish between people and animals is because each has a different appearance, personality, voice, and scent, and the reason we can distinguish where we are now is because we have an address. Objects and spaces are the same, so we can distinguish and express their unique or current state, but before determining the size (amplitude), we must first distinguish between ‘what’ is big and small. In particular, what is comparable to a person’s ‘voice’ is the ‘frequency’ that appears in vibration and noise. Detecting this frequency is the ability of an experienced and skilled mechanic to solve a problem just by listening to the sound, and it can be compared to the frequency detection method of a measuring instrument. Frequency and period (time), wavelength and propagation speed The movemed. If you think that high frequencies are fast and low frequencies are slow, you are right. Also, high frequencies have short wavelengths, and low frequencies have long wavelengths. This relationship can be summarized as follows. ------ #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 57 decibel; DB dB, a way to express the level of noise an...

BISOPE series 57- decibel; DB (dB, a way to express the level of noise and vibration)

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In engineering - generally, the unit of ‘dB (decibel; dB)’ is used to express the ‘size’ of noise, vibration, electricity, etc. If this value is large, it means that the value of noise and vibration is large. Why were these units created? You can just call them pressure (pa), acceleration (G), and voltage (V) as they are... The reason is that the unit dB easily represents the 'range of change in sensation.' So, strictly speaking, dB cannot be said to be a unit because it is a value that varies depending on how the standard is set.

 

Weber-Fechner's law

 

The change in human sensory quantity (P) can be best expressed as the ratio of the change amount to the reference stimulation quantity (S).

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BISOPE series 44 Point, Line, and Planesquare sound sources distance at...

BISOPE series 44- Point, Line, and Plane(square) sound sources (distance attenuation)

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A sound source is a source that generates sound power. If sound sources are classified in the form of poles, they can be classified into monopole, dipole, and quadrupole sound sources. Among them, a point source is a source that is radiated forming a spherical wave from a small sphere that periodically expands and contracts as a result of a change in volume, and is also called a monopole source. In addition, when countless point sources form a straight line, this form like a train is called a line source.

The power radiated from the sound source decreases linearly in the area that can be assumed to be a free sound field (an area that is not very close to the sound source and the sound pressure decreases uniformly as the distance increases). '. In other words, the farther the distance, the quieter the sound. However, the attenuation ratio of the sound power according to the distance is different depending on the shape of the sound source. That is, points decay quickly and lines decay slowly. explain this

 

distance attenuation according to the sound source

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point, line and plane are explained by speaker, train and wall.

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#vibration measurement, #resonance measurement, #building vibration, #noise vibration, #noise prediction, #vibration analysis, #frequency analysis, #3 axis sensor, #facility diagnosis, #vibration diagnosis, #vibration noise education, #FFT, # Vibration measuring instrument, #ultrasound, #sound emission, #SDT, #SDT340

BISOPE series 43- What does solid sound(Structure borne noise) mean?

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The sound of bands and orchestras resounding in the concert hall entertains our brains. Unfortunately, we also analyze the sound. A string instrument that produces sound by plucking the string and its harmonics, a wind instrument that blows wind and produces a beautiful sound with the pipe's unique frequency, and a drum of its own size by beating a drum A percussion instrument that makes a percussive sound, and a keyboard instrument, a person's vocal cords vibrate, and a person's vocal cords vibrate in the throat... This is just music, but it is also called 'structure borne noise, air borne noise' in engineering. What does that mean? is it a guitar? is it a flute? is it a piano? Is it the sound of drums? Why are the pictures of railroad rails and wheels below?

 

The difference between 'structure borne noise, air borne noise'

 

1. What is the difference between the sound coming out of a speaker or mouth and 2. the sound made when hitting a xylophone or drum?

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#Railway vibration, #vibration analysis, #bearing vibration, #vibration education, #resonance measurement, #resonance analysis, #frequency analysis, #FFT, #vibration sensor, #vibration measurement, #facility diagnosis, #vibration consulting, #motor vibration , #natural frequency, #SDT, #acoustic emission