ANALYSIS OF A COLLISION FORCE METER
ANALYS AV EN KROCKVAALDSMAETARE
This report describes a collision force meter which comprises a simple spring-mass system. Maximum indication is read with the help of a string which is pulled out to maximum position and is held there. The spring and mass are enclosed in a plastic tube. The analysis showed that the meter in its present form gives a value of maximum acceleration undergone by the mass. A collision force meter without damping gives: (1) approximate values of the mean acceleration of tube up to time of maximum indication; (2) change in velocity of tube up to time of maximum indication if this is known or estimated, and (3) mean acceleration of entire collision tube, provided that maximum indication occurs after end of collision pulse. If the collision time is known or estimated, change in velocity of entire pulse is obtained. The meter gives an indication of the collision pulse experienced by the tube. The information given therefore depends on the placing of the tube. The possibility of cheaply measuring the indication time or drawing the indicated curve has also been studied. The effect of collision at an angle can be measured by several tubes or by a pivoted tube that aligns itself along line of action of inertial force.
Kungliga Tekniska HoegskolanFack
- Kullgren, A
- NYGREN, P
- Publication Date: 1988
- Pagination: 29 p.
- TRT Terms: Crash tests; Crashes; Equipment; Force; Mathematical models; Measurement
- Subject Areas: Research; Safety and Human Factors;
- Accession Number: 00498196
- Record Type: Publication
- Source Agency: Transport and Road Research Laboratory (TRRL)
- Files: ITRD, TRIS
- Created Date: Sep 30 1990 12:00AM