Patent ID: 7878489
Filing Date: 2011-02-01
Classification: F16F,G05D

Abstract:
1. A method of controlling vibrations between two parts of a structure interconnected by f active mounting devices, comprising damping vibrations between the two parts of the structure, detecting the vibrations between the two parts of the structure, generating variable forces to oppose the vibrations transmitted by each of the f mounting devices, and detecting any resultant vibrations due to the net effect of said vibrations and said variable forces; wherein forces are generated under control of a controller on the basis of an iterative relationship, the iterative relationship being such as to generate the forces of one iteration using controller output signals in frequency domain vector form derived from the controller output signals to the f mounting devices of f immediately previous iterations in frequency domain vector form plus a frequency domain vector quantity derived from the controller output signals to the f mounting devices and the resultant vibrations of more than f previous iterations; and wherein f=2 and the forces of said one iteration are derived by use of a control relationship: where: where: [u [u [y [y [p [p A is a scalar value such that 0<A <1; and [R