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Vibration Solutions develops anti vibration mounting for gensets

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Vibration Solutions provides a technical guidance from AMC-MECANOCAUCHO on the selection of anti vibration mounts for gensets. This article explains the necessary calculations for correct selection, recommendations on optimum position, and different positions where the mounts can be installed on a genset.

1 Necessary technical information for the selection of a correct anti vibration mount for a genset

Basic information required to make a single degree of freedom calculation: Total weight of the genset; Position of centre of gravity; Position of the mounts with respect to the centre of gravity; Disturbing frequency; and Engine model.

Due to the simplification of the mathematical model, the results of these calculations must be understood as guidance recommendation only. When high reliability of calculations is required, it is advisable to perform a calculation that takes into account all the degrees of freedom of the suspended element. Additional elements required for these calculations include 3D drawing of the suspended element; and moments of inertia in X, Y and Z.

This type of calculation provides natural frequencies of the system and the eigenvectors.

Eigenvectors provide information about the vibration modes of the system, allowing AMC-MECANOCAUCHO applications engineers to optimise the suspension and recommend an anti vibration mount that will provide a transmissibility curve where the natural frequencies are far from the disturbing frequencies of the genset.

2 Recommendation on the optimum position of anti vibration mounts for vibration isolation purposes

2.1 Possible positions of mounts within a genset:

2.1.1 Between genset and frame. At this point, depending on the size of the genset, single or multiple pairs of mounts can be used under the engine or alternator.

2.1.2 Beneath the frame.

2.1.3 Double mass isolation system.

2.2 Optimum positions for isolation and stability. The correct stability is achieved with the correct positioning of mounts with respect to the centre of gravity.

Mounts equally loaded and positioned at the height of the crankshaft allow stable suspended elements and uncoupled vibration nodes.

When rigid mounts are installed between the genset and frame, noise interferences are likely to occur, especially if the frame is light and the metalwork is not reinforced. In order to avoid this problem, softer mounts are advisable.

When stability is the main priority and noise created by the genset is not an issue, mounts under the frame can be used. In such cases, when the mounts are correctly calculated, good vibration isolation ratios can be achieved.

The best isolation ratios are achieved using double mass isolation systems. If they are not properly designed, the result can be less than satisfactory, creating amplification or lack of stability. We strongly recommend multiple degrees of freedom calculation at this point.

The technical department of AMC-MECANOCAUCHO can be of great assistance in these calculations.

Installations such as the one below provide a good balance between isolation and stability.

Nevertheless other constructions are possible and our technical department will be ready to advise and provide technical evidences and empirical results on similar cases.

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