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Figure shows noise results for a prototype van measured on a rolling road. The vehicle had a four-cylinder-in-line engine. The engine speed was varied in 3rd gear from just above stall to about 4500 rpm. The sound pressure at a representative interior position was measured in dB using the standard reference, namely 20 ?Pa. Figure Q2 shows the overall noise level and also the component associated with the second harmonic of the engine speed.
a) The noise peak at 3600 rpm is due to an acoustic resonance with a standing wave between the floor and roof of the van. What is the frequency of this resonance and what is the vertical dimension of the van interior?
b) Sketch a graph of the microphone signal at 3600 rpm. Your graph should include time and sound pressure axes with scales to show the ranges for the signal you have sketched.
c) Comment on the overall results in Figure Q2 indicating if they are acceptable or if they indicate a specific NVH problem.
d) It would have been better to have measured the sound pressure in dBA. Explain why.
what is x(5x4)=26?
Graph for the Sequence First we wish to think about the term graphing a sequence. To graph the sequence {a n } we plot the points {n, a n } as n ranges over every possible valu
1) let R be the triangle with vertices (0,0), (pi, pi) and (pi, -pi). using the change of variables formula u = x-y and v = x+y , compute the double integral (cos(x-y)sin(x+y) dA a
2+4
find the unit rate. Round to the nearest hundredth in necessary 325 meters in 28 seconds
Another aid that can help children practise subtraction is the number strip. TGS can be used to improve their ability to count backwards. For example, subtracting 4 from 9 means
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A 90% acid solution is mixed with a 97% acid solution to obtain 21 litres of a 95% solution. Findout the quantity of every solutions to get the resultant mixture.
#question.As office manager of her firm, Marcellyne has been directed to buy new filing cabinets. She knows that cabinet A costs $10, requires 6 square feet of floor space, and hol
Evaluate following limits. Solution Therefore we will taking a look at a couple of one-sided limits in addition to the normal limit here. In all three cases notice
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