Deploying successfully Laser Doppler Vibrometry techniques within the automotive NVH process

Abstract

Laser Doppler Vibrometry is becoming today an established technique and the gold-standard for noncontact measurements in the automotive industry. These methodologies are widely used to characterize the mechanical behaviour of structures in vibration or strain, with always zero mass loading. They provide high precision results with very low operating costs as well as optimized setup times. The applications of laser vibrometry in the automotive industry are extremely various, and are helping today automotive professionals to improve dramatically the NVH performance of components and full vehicles. This paper explains how these methodologies are fitting today in the everyday challenge of automotive NVH Test & CAE engineers: providing best in class noise and vibration quality with mass reductions constraints. A new laser scanning technique including the use of a 3D robot is also presented, providing an innovative way to characterize the dynamics of body structures with very high precision and rapidity. The paper will present a measurement performed on a full vehicle (43 robot positions done in 1h30 hour), with 1094 points of vibration data at 1 Hz resolution.

Single-Point and Surface Quality Assessment Algorithm in Continuous Production with the Use of 3D Laser Doppler Scanning Vibrometry System

“…However, in those cases, the application is usually limited to single samples, not serial production. The primary use examples for mass production quality check inspections can be found in the automotive industry [ 34 ]. In this case, the system is used for measurements of full surfaces or parts as stationary operations, which require some time to perform the measurement.…”

Novel techniques for laser doppler vibrometry for vibrating shiny and mirror surfaces

“…A laser Doppler vibrometer (LDV) is also an optical interferometer instrument primarily used for dynamic characterization in MEMS testing [41] but also found diverse uses in many other applications [4] such as structural health monitoring [42], clinical diagnosis [43], automotive [44], and even fruit quality testing [45].…”