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# Acoustical Engineering

Acoustical engineering is the discipline that studies sound and vibration. It is the application of the science of sound and vibration in technology. Acoustical engineers are concerned with the design, analysis and control of sound. An example of a typical goal of an acoustical engineer is to reduce unwanted noise. This is referred to as noise control. The principles are to implement technology and design in various ways to control the unwanted noise.

Acoustical engineers can do work in other areas aside from noise control. These areas can include ultrasound in medicine and programming of digital sound. They can design concert hallâ€™s acoustics to enhance the sound of an orchestra and specify a railway stationâ€™s sound system so that the announcements are intelligible.

There are many sub disciplines in acoustical engineering. These include aeroacoustics, audio signal processing, architectural acoustics, bioacoustics, electroacoustics, environmental noise, musical acoustics, noise control, psychoacoustics, speech, ultrasonics, underwater acoustics and vibration and dynamics. These all look at the way sound interacts with its surroundings. The basic sound wave behaviors include absorption, reverberation, diffraction and refraction.

### Analysis of DSP, sampling and rotating shafts/machines

TQM3 - Introduction to Maintainability(DSP) 1. The signal X(t) from an accelerometer, mounted on a pump bearing, contains frequency components up to 500 Hz. The pump shaft rotational speed is 1,179 RPM. (a) Express the pump shaft rotational frequency in Hz. (b) At what rate, must X(t) be sampled in order to reconstruc

### Vibrational Amplitude

Please see the attached. I am looking for help with question 3 ONLY in this posting. The other questions have been posted separately. This is from the book Mechanical Vibration, (ISBN 0-13-948373-X), By Haym Benaroya, year 1998. An m-c-k system is tested to determine the value of c. Assume k=10lb/ft and m=2slug. If the v

### Finding the Period of Vibration

Determine the period of the vibration of the system in the attached file.

### Determine the speed and height of a surge wave.

A rectangular channel is discharging 50 cfs per foot of width at a depth of 10ft when the discharge upstream is suddenly increased to 70 cfs/ft. What is the speed and height of the surge wave.

### Simple Harmonic Motion Problem Set

A) A mass of 25kg is supported by a vertical spring of stiffness 25kN/m and is acted on by a periodic force which has an amplitude 50N and frequency 5Hz. determine the steady state amplitude of the force vibration and the maximum force acting on the support point for the spring. b) A horizontal platform rests on four vertical