Noise Level
Noise Level
To calculate the noise level of the engine exhaust pipe?
The A-weighted sound power level (SWL) of a lawnmower is 93dB.Its distance from the operators ear is 0.6m.
The user of the lawnmower sits on it . It is a ride-on lawnmower for grass cutting.
Assume that the effective noise source is the engine exhaust pipe
Calculate the noise level to which the rider is exposed when the engine is running normally.
anybody ???????
Come on enviromentalists
Why 0.5*10^-20 for Io
I continue!
♠ noise power of exhaust pipe P=4pi*r^2 *I(r), where r=0.6m;
♦ meanwhile 10*lg(I/I0) =93 dB,
hence I =I0*10^9.3 =0.5*10^(-20) *10^9.3,and
P=4pi*0.6^2 * 0.5·10^(-10.7) =0.45·10^(-10) W;
 |
 BRUEL KJAER 2238 MEDIATOR SOUND NOISE LEVEL METER Brüel  US $2,799.95
|
 BRUEL KJAER 2238 MEDIATOR SOUND NOISE LEVEL METER US $2,248.00
|
 Bruel Kjaer 4426 Noise Level Analyzer w ZG 0199 Power Supply US $799.99
|
 Bruel Kjaer 4426 Noise Level Analyzer US $599.99
|
 Bruel Kjaer Noise Level Analyzer type 4426 US $579.00
|
 TES 1355 Noise Dose Meter Exposure Time Sound Level Meter Range 70 140dBA RS232 US $515.00
|
 Digital Sound Noise Level Meter with SoftwareUSB Cable US $399.00
|
 TES TES1352H Programmable Sound Noise Level DB Auto Range Meter Max 130dB US $389.00
|
 CENTER322 Sound Level Meter Noise Meter Datalogger PC Interface Range 30 130dB US $287.00
|
 Datalogging Digital Sound Level Noise Meter Data Logger US $255.33
|
 NEW TR SLT1A4 Sound Level Noise30 130dB Transmitter Sensor LUTRON meter tester US $232.00
|
 SMART SENSOR AR854 Digital Noise Sound Level Meter Tester US $225.00
|
 NEW AR854 Digital Noise Sound Level Meter Tester SMART SENSOR US $222.00
|
 NEW AR854 Digital Noise Sound Level Meter Tester DBSmart Sensor US $218.00
|
 CENTER321 Sound Level Meter Noise Meter Max Min Hold PC Interface 30 130dB US $206.00
|
 NEW AR854 Digital Noise Sound Level Meter Tester DB Smart Sensor US $199.00
|
 Datalogging Digital Sound Level Noise Meter with Software and USB cable US $199.00
|
 Sound Level Noise Meter Mics Calibrator 94dB 104 dB US $175.85
|
 Sound Level Noise Datalogger Data logger US $166.91
|
 CEM DT 173 USB Sound level Meter built in Datalogger Noise Monitor Data logger US $169.00
|
 New Digital Sound Meter Noise Level 30 130dB US $166.46
|
 DT 173 High Accuracy Digital Sound Noise Level Data Logger Datalogger USB NEW US $159.95
|
 Digital Sound Noise level Meter gauge Self Calibration US $157.09
|
 TES 1350R Sound Level Meter with RS232 Noise Level Meter Max Hold US $155.00
|
 CENTER320 Sound Level Meter Noise Meter Max Min Hold 4 Digits 28dB 130dB US $152.50
|
 ND9B Sound Noise Level Meter Calibrator 94dB 114dBNEW US $146.00
|
Tigertailz - Noise Level Critical
