Heavy rail / Urban light rail

Modal analysis

Determine the modal characteristics of a structure – in addition to vibration testing for example.

Objectives

  • Understand vibratory phenomena
  • Adjust “finite element” models
  • Measure the in-situ response of a structure subjected to one or several known excitations in order to determine its modal characteristics – frequency, damping, modal deflection curve associated with each mode

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Test
facilities

  • Piezoelectric accelerometers
  • Impact hammers
  • Electrodynamic exciter
  • Modal analysis software « LMS TEST LAB »

Norms

- ISO 7626-1 -

Mechanical vibration and shock – Experimental determination of mechanical mobility - Part 1: Basic terms and definitions, and transducer specifications

- ISO 7626-5 -

Vibration and shock – Experimental determination of mechanical mobility - Part 5: Measurements using impact excitation with an exciter which is not attached to the structure

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Determine the modal characteristics of a structure – in addition to vibration testing for example.
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Heavy rail - Urban light rail