Higher operational speeds of machines and vehicles, and their greater utilization can impose higher dynamic loadings. On the other hand, miniaturisation, the use of solid state devices and closer quality control enable systems to withstand more severe shocks and vibration. The author stresses the importance of adopting a realistic testing procedure which is closely related to operating conditions. The permissible levels and standards are discussed. However, there is seldom anything in detail to help predict dynamic response, which is often dependent upon the resonant conditions. The principles involved in modal analysis are discussed. Electro-magnetic vibrators are used extensively in dynamic testing because of their versatility when used in conjunction with a digital control system. The author shows how a digital system can be used to produce a random vibration spectrum with a square peak, a V-Notch and a square notch using a typical 400 lines fast fourrier transport. The drive spectrum takes into account the dynamic characteristics of the entire arrangement including the test object. (TRRL)

  • Corporate Authors:

    Modino Press Limited

    50 Pine Grove
    London N2O 8LA,   England 
  • Authors:
    • Grootenhuis, P
  • Publication Date: 1980-6

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00325111
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD, TRIS
  • Created Date: Aug 15 1981 12:00AM