AUDIBLE-FREQUENCY STIFFNESS OF A PRIMARY SUSPENSION ISOLATOR ON A HIGH-SPEED TILTING BOGIE

This study uses measurements and modeling within an audible frequency range to examine the preload-dependent dynamic stiffness of a primary suspension isolator on a high-speed tilting bogie. The stiffness is found to depend strongly on both frequency and preload. The former displays some resonance phenomena, such as stiffness peaks and troughs, while the latter exhibits a steep low-frequency stiffness increase in addition to an anti-resonance peak shifting to a higher frequency with increased preload. The problems of simultaneously modeling the preload and frequency dependence are removed by adopting a frequency-dependent waveguide approach, assuming incompressible rubber with an Abel operator kernel as its shear relaxation function. The preload dependence is modeled by a non-linear shape factor based approach, using a globally equivalent preload configuration. All the translational stiffnesses are modeled, including the vertical, longitudinal and lateral directions, and the vertical stiffness results are compared to those of measurements in a specially designed test rig. Good agreement is obtained for a wide frequency domain and for a wide preload domain while using a minimum number of parameters. This approach is superior to traditional linear approaches and to finite element methods because a fast, easily interpretable, closed-form solution can be obtained.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/09544097
• Corporate Authors:

  Institution of Mechanical Engineers

  1 Birdcage Walk
  London SW1H 9JJ,   England 
• Authors:
  • Kari, L
• Publication Date: 2003

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 47-62
• Serial:
  • Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit
  • Volume: 17
  • Issue Number: 1
  • Publisher: Sage Publications Limited
  • ISSN: 0954-4097
  • EISSN: 2041-3017
  • Serial URL: http://pif.sagepub.com/content/current

Subject/Index Terms

• TRT Terms: Audio frequency; Car trucks (Railroads); Mathematical models; Resonance; Rubber; Stiffness; Waveguides
• Uncontrolled Terms: Primary suspension isolators
• Subject Areas: Railroads; Vehicles and Equipment;

Filing Info

• Accession Number: 00976592
• Record Type: Publication
• Files: TRIS
• Created Date: Jul 3 2004 12:00AM