초록 ▼

Vibration isolation between a source (1) and a mounting (3) is provided by means of a vibration-cancelling actuator (4a) with a shear isolator (5) placed in series with the source (1). Mechanical and magnetic actuators are disclosed, a preferred mechanical actuator including its own shear isolation

Vibration isolation between a source (1) and a mounting (3) is provided by means of a vibration-cancelling actuator (4a) with a shear isolator (5) placed in series with the source (1). Mechanical and magnetic actuators are disclosed, a preferred mechanical actuator including its own shear isolation with a ratio of compliance in shear and axial directions of at least 50:1.

대표청구항 ▼

A method of reducing the transmission of vibration along a path leading from a source of vibration to a mounting of that source, which method comprises the employment of at least one vibration actuator and the energization of each actuator to reduce the effect of source-derived vibration on said mou

A method of reducing the transmission of vibration along a path leading from a source of vibration to a mounting of that source, which method comprises the employment of at least one vibration actuator and the energization of each actuator to reduce the effect of source-derived vibration on said mounting, the improvement which involves including shear decoupling means in the vibration path between the source of vibration and the mounting by forming each actuator as a volume of incompressible fluid defined in part by a peripheral containing wall which allows shear movements between the axial ends thereof but which is substantially resistant to radial expansion on a pressure rise within said volume, whereby the actuator has a much higher compliance in the transverse direction than in the axial direction.