Sampling errors in near field measurements on non-planar surfaces

Techniques of predicting the radiated field of a vibrating structure from measurements of its near field are well known. The effects of spatial sampling and measurements errors on the calculated radiated field have been investigated by several authors for planar measurement surfaces. In this paper an extension of these analyses to non-planar surfaces is presented. Examples of the application of the new sampling criteria and error calculations are shown for a cylindrical near field measurement surface.