VIBRATIONS OF FOUR WHEEL MOTOR VEHICLES DUE TO UNEVEN ROAD SURFACE

A numerical calculation method of the vibrations caused by uneven road surfaces is dealt with for three-dimensional multi-axle vehicle models. Measurements are quoted to illustrate that the lateral elasticity of the tyres should not be neglected. For reasons of numerical convenience (the corresponding cross-spectra are then zero), the unevennesses of a road-surface cross-section, determined by measurements, are described by symmetrical (bounce excitation) and antimetrical (roll excitation) components. With appropriately matched vehicle coordinates, the movement equations can then be de-coupled into two equation systems. The computing example used is a car with a front McPherson axle and a rear beam axle. It is demonstrated that with an anti-roll bar it is hardly possible to achieve any further vibration improvements. If fitted additionally with A damper, however, the anti-roll bar can noticeably reduce the dynamic wheel loads and side forces of the associated axle, and transverse and yaw vibrations of the body, notwithstanding that this is at the expense of body roll acceleration. It is possible to make improvements without losing comfort only if a linkage compensates the roll vibrations of the axles one against the other to eliminate reactions. For the covering abstract of the conference see TRIS 378303. (Author/TRRL)

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/902650392X
• Supplemental Notes:
  • Proceedings of the 7th IAVSD Symposium on the Dynamics of Vehicles on Roads and Tracks, held in Cambridge, September 7-11, 1981.
• Corporate Authors:

  Swets & Zeitlinger

  Heereweg 347B
  2161 CA Lisse,   Netherlands 
• Authors:
  • HELMS, H
• Conference:
  • Proceedings of the 7th IAVSD Symposium on the Dynamics of Vehicles on Roads and Tracks, held in Cambridge, September 7-11, 1981.
• Publication Date: 1982

Media Info

• Features: Figures; References;
• Pagination: p. 167-180

Subject/Index Terms

• TRT Terms: Axles; Calculation; Conferences; Driving; Dynamics; Elasticity (Mechanics); Equations; Handling characteristics; Mathematical models; Methodology; Motor vehicles; Pavements; Rolling; Roughness; Smoothness; Surface course (Pavements); Suspension systems; Tires; Vehicles; Vibration; Yaw; Yaw
• ITRD Terms: 1322: Axle; 6464: Calculation; 8525: Conference; 5473: Dynamics; 5912: Elasticity; 3071: Evenness; 6473: Mathematical model; 9102: Method; 2955: Pavement; 1329: Suspension (veh); 9080: Three dimensional; 1381: Tyre; 1255: Vehicle; 1646: Vehicle handling; 5558: Vibration; 1636: Yawing (veh)
• Subject Areas: Highways; Pavements; Vehicles and Equipment; I91: Vehicle Design and Safety;

Filing Info

• Accession Number: 00378316
• Record Type: Publication
• Source Agency: Institute for Road Safety Research, SWOV
• ISBN: 902650392X
• Files: ITRD, TRIS
• Created Date: Oct 30 1983 12:00AM