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Browse Prior Art Database

Acoustic Boom Clear Path and Parking Program

IP.com Disclosure Number: IPCOM000039228D
Original Publication Date: 1987-May-01
Included in the Prior Art Database: 2005-Feb-01
Document File: 2 page(s) / 58K

Publishing Venue

IBM

Related People

Mohd-Hashim, A: AUTHOR [+2]

Abstract

For boom measurements in an anechoic chamber to check acoustic emission from a device under test, an operator outside the chamber normally controls the boom via a CCTV system. A program is disclosed to automatically check that the boom path is free of obstructions and to park the boom at a defined position. In performing measurements for sound power, the acoustic boom encircles the device under test. Wrong arrangement of the device under test or other objects may obstruct the motion of the boom and has to be continually checked by the operator so as not to render the whole measurements invalid. This program checks the boom's path clearance and issues an audible signal if obstructed, and also ensures that the measurement is done at the correct boom speed of 32 s/rev.

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Acoustic Boom Clear Path and Parking Program

For boom measurements in an anechoic chamber to check acoustic emission from a device under test, an operator outside the chamber normally controls the boom via a CCTV system. A program is disclosed to automatically check that the boom path is free of obstructions and to park the boom at a defined position. In performing measurements for sound power, the acoustic boom encircles the device under test. Wrong arrangement of the device under test or other objects may obstruct the motion of the boom and has to be continually checked by the operator so as not to render the whole measurements invalid. This program checks the boom's path clearance and issues an audible signal if obstructed, and also ensures that the measurement is done at the correct boom speed of 32 s/rev. A shaft encoder is used to check the path clearance by comparing two consecutive readings and checking that the second is larger than the first. The boom is driven through a slipping clutch so that the boom stops rotating when an obstruction is encountered. The program detects this via the shaft encoder and sounds an alarm. However, a different function is used during the transition between 359o to 0o . To cut down on time, the boom is rotated at a high speed and just before completion of the check, it is switched to the measurement speed so that measurement can be done immediately on a satisfactory check. On completion of the measurement, the boom is parke...