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Surface Vibration Measurements By Scanning Laser: Case Study of Application to Fuel Injection Pump
Published May 03, 1994 by Institution of Mechanical Engineers in United Kingdom
Event: Vehicle NVH and Refinement
Structural improvements to reduce vibration and hence control other noise radiated from engines and auxiliary equipment are greatly facilitated by clear measurements of the distribution of vibration over the surface. Most methods for making such measurements involve multi-point application of sensors, and this becomes tedious in practice. Furthermore these measurement are affected by temperature, accessibility in a vehicle, mass loading, etc.
Laser interferometry techniques overcome some of the major disadvantages of discrete sensor techniques, particularly in the case of small complex components. The Motor Industry Research Association have developed a Scanning Laser Interfermoter (SLI) for automotive applications. As an example this instrument has been employed to evaluate the vibration of a fuel injection pump surface during operation on the manufacturer's test stand. New modes of vibration, which have not been clearly defined by conventional methods, were quantified, notably vibration of the actuator brackets and delivery pipes, as well as the expected normal modes of the pump housing