The Design of Vibration-Isolating Bases for Machinery

Abstract

Abstract The isolation of rotating or reciprocating machinery to reduce the magnitude of oscillating forces transmitted to adjacent structures is common practice. Where operating speeds are high and the oscillating forces are of moderate intensity, the solution is relatively easy because little care need be taken in design to obtain a sufficiently efficient isolator. However, a vibration testing machine requires careful design of the isolator because the forces to be isolated are of great magnitude and because such machines operate over a wide range of speed. This paper describes the technique used at the Naval Research Laboratory for mounting vibration testing machines. The machine is secured rigidly to a relatively heavy mounting base and the mounted machine is supported upon helical springs. This method is generally applicable to the design of machinery bases and will be found to be of particular value where low-speed machines are involved.