8-hour time-weighted average (TWA) noise exposure for 80.5 dba
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8-hour time-weighted average (TWA) noise exposure for 80.5 dba
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- Determine the combined reverberant sound level and a direct sound level received by a person 5m away from the sound source of an air-condition unit to an enclosed room whose dimensions are: L=4.5 m, H = 3.6m, and W = 3 m. The floor is covered with carpet with an absorption coefficient of 0.14, the wall is made of marble with absorption coefficient of 0.01, and the ceiling is covered with acoustic ceiling board with an absorption coefficient of 0.80. Assume that the directivity factor is equal to 2. SPL=50dBA cordless microphone emits sound with an average power output of 73.9 W. Calculate the distance (in meters) at which the intensity of the sound is 1 x 10-8 W/m2In instrumental analysis, what are the sources of noise?
- Subject - Determine the effects of sound and vibration related to building services and human comfort Question - Determine the transmision paths of sound, from a building service system through different forms of structure.A sinusoidal wave on a string is described by the wave function ?(?,?) = 0.02 sin(30? − 400?) (SI units). If the string’s linear mass density is ? = 0.005 kg/m, then the transmitted power is:How is the energy loss captured by the apparatus? You may explain using mathematical equations.
- How is the energy loss captured by the apparatus? You may explain using mathematical equations. Bernoulli's ApparatusThe source sent an ultrasonic signal of the frequency of 5 MHz and received two echo-signals with a delay of 60 ms between them. The first echo-signal returned after 40 ms. What is the thickness of the organ from which the signal was reflected if the reflection occurred from opposite sides of the organ? What is the absorption coefficient if the intensities of the echo-signals differ by 1120 times? The speed of the wave is 1450 m / s.TOPIC: PRIOPERTIES OF SUBSTANCES:Note: The pressure values are absolute values unless specified.Determine the properties of H2O with units according to the following Table:
- TOPIC: PRIOPERTIES OF SUBSTANCES: Note: The pressure values are absolute values unless specified. Determine the properties of H2O with units according to the following Table:What is the actual wavelength and velocity of a near-infrared beam 1l = 0.901 mm2 of light modulated at a frequency of 330 MHz through an atmosphere with a dry bulb temperature, T, of 26°C; a relative humidity, h, of 75%; and an atmospheric pressure of 893 hPa?It is necessary to propose the design of the base of a Chiller that has a weight of 1.5 tons.The proposed structural element must have a natural frequency between 10 rad/s and 15rad/s.