Effective vibration isolation requires a machine to be elastically suspended by placing flexible mountings between the machine and its seatings (floor, slab, chassis, etc.). The type of mounting, its number, distribution, positioning and individual characteristics, depend on the overall characteristics required by the suspension to give the desired result.
We have a consolidated 20-year experience in designing elastic suspensions for all sort of applications: propulsion engines, diesel generator sets, electric motors, compressors, gas turbines, etc.
Single Elastic Suspensions
We developed an in-house software tool for a fast and reliable evaluation of the following parameters:
Static deflections due to gravity loading at resilient mountings locations and machinery Centre of Gravity (C.o.G.)
Deflections at resilient mountings locations and C.o.G. due to sea movements and external forces (nominal torque, propeller thrust, etc)
Rigid body natural frequencies (potential resonance speeds) and corresponding modal shapes, graphically represented on a Campbell diagram.
Dynamic deflection amplitudes at resilient mountings locations and C.o.G due to harmonic loading (engine excitations, eccentric loading, etc.)
The software is based on analytic rigid body dynamics and is able to handle nonlinear load-deflection curves describing the behavior of the resilient mounting. Finally, it produces automatically a calculation report with all the results arranged in tables and charts.
Campbell Diagram
Double and Triple Elastic Suspensions
When the vibration isolation becomes a stringent requirement it is advisable to support the vibration source on a double or even triple elastic suspension. If well designed, a double elastic suspension guarantees a much higher vibration attenuation.
We can design double and triple elastic suspensions which can reach the required vibration attenuation for any possible configuration of the propulsion or generation set.
