Accession Number : ADD002397
Title : Train Resonant Car-Body Rocking Detector System.
Descriptive Note : Patent,
Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON D C
Personal Author(s) : Swaim,Frank H
Report Date : 25 Nov 1975
Pagination or Media Count : 8
Abstract : The patent relates to a method whereby a hydraulic sensor detects and registers the resonant rocking motion of a train car and activates the brake system to stop the train prior to possible derailment due to wheel 'rock-off' from the track. A hydraulic input arm attached to the sideframe pressurizes fluid within the sensor mounted on the bolster. Pressure build-up within a specific time interval due to rock-off resonant oscillation causes a ram to extend from the sensor and crush a piezoelectric element. The resultant signal activates an electroexplosive brake line venting mechanism, puncturing and venting the brake line to decelerate the train and dissipate the resonant oscillation-mode energy to immediately stabilize the rock-off situation and then gradually reduce train speed to a stop.
Descriptors : *Railroad cars, *Accidents, *Detectors, *Patents, Roll, Hydraulic servomechanisms, Braking
Subject Categories : Surface Transportation and Equipment
Distribution Statement : APPROVED FOR PUBLIC RELEASE