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Noise & Vibration Measurement News
Welcome to the latest issue of Noise & Vibration Measurement News. We have a new article by Dr Mike Donegan entitled How To Calculate A Resultant Vector plus an explanation of dBs, noise floor & dynamic range, a short introduction to resonance, a tutorial on windowing & overlapping analysis and some notes on converting between acceleration, velocity & displacement.
How to calculate a resultant vector We can distinguish between quantities which have magnitude only and those which have magnitude and are also associated with a direction in space. The former are called scalers, for example, mass and temperature. The latter are called vectors, for example, acceleration, velocity and displacement... Learn More
What are dB, noise floor & dynamic range? Most engineers are probably familiar with or have come across the decibel or dB as a unit of measurement. Its most common use is in the field of acoustics where it is used to quantify sound levels. However, as will be explained in this article, it is also useful for a wide variety of measurements in other fields such as electronics and communications...  Learn More	What is resonance? In technical terms, resonance is the tendency of a structure or material to oscillate at maximum amplitude at a certain frequency. This frequency is known as the structure’s resonant frequency. When damping is small, the resonant frequency is approximately equal to the natural frequency of the structure, which is the frequency of free vibrations of the molecules of the material itself...  Learn More
Understanding windowing & overlapping analysis A visitor to the blog asked “Could you please put an example about overlapping technique? Maybe with the same 10 or 9.5 Hz sinusoidal wave example so that we can see how overlapped window could make a difference in processed frequency spectrum.” ...  Learn More	Calculating velocity or displacement from acceleration It is quite straightforward to apply “classical” integration techniques to calculate either a velocity time history from an acceleration time history or the corresponding displacement time history from a velocity time history. The standard method is to calculate the area under the curve of the appropriate trace...  Learn More
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