On the autonomous determination of position of a moving object by means of a space gyrocompass, a directional gyroscope and an integrating device

DETERMINATION OF THE DIRECTIVITY OF A PL

DETERMINATION OF THE DIRECTIVITY OF A PLANAR NOISE SOURCE BY MEANS OF NEARFIELD ACOUSTICAL HOLOGRAPHY, PART III: MEASUREMENTS ON HOMOGENEOUS, PROFILED AND COMPOSITE PANELS

✍ M.A. Rowell; D.J. Oldham 📂 Article 📅 1996 🏛 Elsevier Science 🌐 English ⚖ 754 KB

In two companion papers, a method has been presented for determining the directivity of a planar noise source by using the technique of Nearfield Acoustical Holography [1,2]. In this paper, a practical NAH measuring system based upon a single scanning microphone is described. The system is employed