ANALYSIS OF PITCHING MOVEMENT FOR IMPROVED COLLISION SIMULATION

ANALYS AV PITCHROERELSE FOER FOERBAETTRAD KROCKSIMULERING

On changing from 30 to 35 mph, deviations in readings were noted between collision tests and collision simulation. One of the reasons is that pitching movement at 35 mph is more pronounced than at 30 mph. An analysis has been made of pitching movement, and a design proposed for a new collision simulator. Ten collision tests with different pitching characteristics were analysed by evaluating high speed films. Horizontal and vertical speeds and accelerations were calculated at three points on the body, as well as pitching angle, angular velocity and angular acceleration, and global and local instantaneous centres during the collision process. Since the instantaneous centre is not stationary during collision, pitching movement cannot be simulated exactly by suspending the simulator body in a fixed axis. Approximate simulation of pitching movement by suspension in one fixed axis was found to be too coarse. The force required to simulate pitching movement in relation to two suspension points was determined by computer. Pitch simulation by means of fixed rails is discussed in the report. Calculations based on speeds and pitching forces show that hydraulics is a possible solution, but valves of the necessary rapidity and accuracy must be designed. (TRRL)

• Corporate Authors:

  Chalmers University of Technology, Sweden

  Institutionen foer Mekanik
  S-402 20 Goeteborg 5,   Sweden 
• Authors:
  • NILSSON, M
  • Segle, P
• Publication Date: 1982

Language

• Swedish

Media Info

• Features: Appendices; Figures; References; Tables;
• Pagination: 81 p.

Subject/Index Terms

• TRT Terms: Angularity; Calculation; Crash tests; Crashes; Improvements; Mathematical analysis; Motion; Pitch (Dynamics); Simulation; Testing
• Uncontrolled Terms: Angles
• ITRD Terms: 6471: Analysis (math); 6427: Angle; 6464: Calculation; 1648: Impact test (crash); 9108: Improvement; 5483: Movement; 9103: Simulation
• Subject Areas: Highways; Research; Vehicles and Equipment; I91: Vehicle Design and Safety;

Filing Info

• Accession Number: 00376090
• Record Type: Publication
• Source Agency: Swedish National Road and Transport Research Institute (VTI)
• Report/Paper Numbers: Monograph
• Files: ITRD, TRIS
• Created Date: Jul 30 1983 12:00AM