Technical Report
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What is dB?Decibels (dB) are used in a variety of fields, including electricity, communications, optics, acoustics, and vibration. This section summarizes the basic definition of decibels (dB), their significance, their usefulness, and how they are used in various fields.
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About FFT analyzersTo understand the meaning of the data displayed by an FFT analyzer, it is necessary to understand the concept of Fourier series, which is the fundamental idea behind FFT, and its mathematical background.
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What is fluctuating sound analysis?By using an index (sound variation analysis) that can quantify various time-varying components based on loudness, it becomes possible to quantify not only the timbre (pitch) of a sound but also its time-varying period.
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What is sound quality evaluation?Sound quality evaluation is a technique that uses psychoacoustic technology to quantitatively analyze sound in accordance with how people perceive it. By analyzing sound quality with sound quality evaluation technology and improving sound technology, it becomes possible to transform sound into a pleasant, gentle, and natural sound.
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About sound and its sensorsWhen measuring sound, the frequency characteristics and magnitude are typically considered. As you know, frequency is measured in Hz. Because the range of variation for magnitude is very wide, a logarithmic scale is used.
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On ultrasonic vibration measurement of wire bonders using Laser Doppler VibrometerIn wire bonding, ultrasonic waves are commonly used, and the application of ultrasonic vibrations is a crucial parameter that affects the quality of the bond.
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About vibration and its sensorsVibrations can be broadly classified into the following three types based on their characteristics.
●Straight and sturdy
● Bending vibration
● Torsional vibration -
A coefficient representing the damping of vibrationsSince taking countermeasures after vibrations occur is time-consuming and costly, it is important to thoroughly consider vibrations in advance when designing machinery and to implement measures to prevent or reduce vibrations.
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What is a sound level meter?Sound level meters have become a familiar tool for us as simple noise measurement devices, and their importance as environmental measuring instruments has also increased.
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Vibration damping materials and their performance measurement"Vibration damping" is a technology that converts the vibration energy of a solid surface into thermal energy, thereby reducing the vibration of the solid surface.
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Degree ratio analysis and tracking analysisFor rotating machines that must cover a wide range of rotational speeds, from low to high RPMs, the resonance between the natural frequencies of each component that makes up the machine and the rotational speed becomes a crucial issue.