ASSESSING HUMAN PERCEPTION OF AERODYNAMIC AUTOMOTIVE NOISE
The goal of this study was to determine the relationship between the perceived noise and its changes with vehicle speed and cross winds; in other words, to identify how the perceived parameters change with velocity. First, to measure the wind noise component only, it was necessary to test in a facility which removes/excludes engine and road noise, as well as variable weather conditions (i.e., wind speed and direction). Then to experimentally determine the interior noise, wind tunnel measurements were conducted on a series of vehicles. Finally, in analyzing the results, a linear proportion between N10 and vehicle velocity was concluded. (N10, the percentile loudness calculated from the data, represents the human perception parameter).
THE INVENTION CONCERNS A CONTROL CIRCUIT FOR ANAEROBIC REACTOR SYSTEM. THE TOUR INCLUDES FILTER 16 ESTIMATE THAT RECEIVES INPUT SIGNAL SENSOR PRODUCTS AN ESTIMATE OF THE PRESENT VALUE A VARIABLE IN THE SYSTEM, COMPARE THAT ESTIMATE FOR A SIGNAL SENSOR THE VARIABLE AND PRODUCT OF THAT COMPARISON, SIGNAL ERROR dIFFERENCE IS TO COMBINE THE RECEIVED SIGNAL and reapplied INTEGRATOR, A DISPOSAL OF A BIAS LONG TERM THAT MAY BE PRESENT IN AT LEAST ONE OF SIGNALS rECEIVED, SUCH ELIMINATOR INCLUDING HIGH PASS FILTER BY 53 OR rECEIVED INPUT SIGNALS ARE TRANSMITTED TO THE iNTEGRATOR 58, SUCH FILTER HIGH PASS THAT REJECTING THE BIAS PERSISTS FOR A PERIOD CONSIDERABLY LONGER THAN THE TIME cONSTANT SYSTEM. APPLY THE iNVENTION INCLUDING THE TREATMENT OF WASTE WATER.