Measuring and testing – Simulated environment
Patent
1986-01-13
1987-06-30
Myracle, Jerry W.
Measuring and testing
Simulated environment
73117, 73646, G01M 1500
Patent
active
046761110
ABSTRACT:
The present invention is directed to providing an inexpensive, yet effective, simulation for measuring the sound level of the muffler contribution to the total sound created by a truck during a drive-by. The simulation method includes disconnecting a drive shaft of the drive mechanism of the truck and installing a dynamometer. When the throttle of the engine is increased, the dynamometer applies a load so that the acceleration rate of the drive mechanism compares similarly to the acceleration rates of a truck during an actual drive-by test in accordance with CFR 40, part 202. Sound barriers are placed around sounds sources other than the muffler of the truck. Microphones are used to sense the sound during the test for recording by strip-chart recorders.
REFERENCES:
patent: 1044121 (1912-11-01), Beall
patent: 1830237 (1931-11-01), Morse
patent: 3127767 (1964-04-01), Kamp
patent: 3326036 (1967-06-01), Hoeppner
patent: 3695098 (1972-10-01), Kirkland, Jr.
Article: "Progress in the Reduction of Diesel Engine Noise" Robert L. Mason; Sound and Vibration, Feb. 1974; pp. 16-19.
SAE 840347: "A Transient Diesel Test Bed with Direct Digital Control"; J. Koustas and N. Watson; Internat'l Congress & Expo, Detroit, Michigan; Feb. 27-Mar. 2, 1984.
SAE 840348: "Transient Testing of Diesel Engines"; C. A. Clark, M. P. May & B. J. Challen; Internat'l. Congress & Expo, Detroit, Michigan, Feb. 27-Mar. 2, 1984.
SAE 840349: "Dynamometer Simulation of Truck and Bus Road Horsepower for Transient Emissions Evaluations"; Chas. M. Urban (Southwest Research Institute, San Antonio, Texas); pp. 69-84.
Brochure: "PAISI* Does It"; by BBC Brown Boveri (one page).
Brochure: "TELMA"; multi-page brochure.
Bethke Timothy A.
Wagner Wayne M.
Donaldson & Company, Inc.
Myracle Jerry W.
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