Geometrically qualified ESPI vibration analysis of an engine

• Published in: Optics and lasers in engineering Vol. 41; no. 4; pp. 659 - 671
• Main Authors: Farrant, D.I., Petzing, J.N., Tyrer, J.R.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Oxford Elsevier Ltd 01.04.2004; Elsevier
• Subjects: Biological and medical applications; Exact sciences and technology; Fundamental areas of phenomenology (including applications); Imaging and optical processing; Instruments, apparatus, components and techniques common to several branches of physics and astronomy; Internal combustion engine; Laser doppler velocimetry; Laser spectroscopy; Mechanical instruments, equipment and techniques; Optics; Physics; Speckle and moire patterns; Speckle interferometry; Vibration; Vibration isolation; Internal combustion engine; Vibration; Speckle interferometry; Laser doppler velocimetry; Vibrations; Internal combustion engines; Laser Doppler velocimeters; Theoretical study; Vibration measurement; Optical systems; Laser velocimetry; Experimental study
• ISSN: 0143-8166; 1873-0302
• DOI: 10.1016/S0143-8166(02)00180-X

This paper presents an application in the automotive industry where a combination of electronic speckle-pattern interferometry and laser doppler velocimetry were used at a critical stage in the design process of an internal combustion engine. Combined deformation and surface relief measurements were used to study the phase and amplitude of deformation of a vibrating engine. The relief data was combined with the interferometer geometry and used to geometrically correct the deformation data, in an effort to improve accuracy. The measurements allowed rapid identification and quantification of design weaknesses, particularly those causing undesirable resonances. This led to a significant reduction in the design time and lowering of costs, when compared with existing design optimisation methods.