All structures vibrate/oscillate at some natural frequency. Each component of a generating set will vibrate at its natural frequency if a compatible frequency of excitation is applied to it. The prime mover (normally an internal combustion engine) driving the generator provides rotational and reciprocating forces which excite the whole assembly. If the vibrations excite resonance in the genset premature failure could occur.

A structure subjected to a vibrating force will experience cyclic displacement which can cause premature failure. If the movement of the structure is restricted the force will be transmitted to another area. This could result in premature failure in an area not directly associated with the original incidence.

Vibration Technology

Engineers study vibration, its effects and prevention methods in order to design out potential problems. However, problems can occur because several individually designed components are assembled together to form a new structure. Vibration technology has developed rapidly over recent years, We have been able to utilise  this technology to help customers with vibration issues. Our assistance is often sought by generating set assemblers/suppliers and the end users. 

One advantage that is offered to our customers is the ability to have a new set design verified by vibration analysis. This will prove the design criteria and provide a base line signature for use during routine periodic machinery health monitoring. We advise all customers to monitor the health of the generating set using vibration monitoring equipment.

Newage AVK SEG have the facilities for measuring the following parameters:-

Check generator set compliance with ISO 8528/9 and DNV recommendations.

Operating Deflection Shape (ODS) can be achieved by collecting data at specific locations around the structure 
    of interest.   Visual representation of the animated structure aid dynamic analysis. The ideal analysis is carried out 
    at the generators normal operating conditions.

(Use the above two images from the Product guide CD issue2)

Modal Analysis data can be used to fully analyse and solve structural dynamic problems. This technique can be
     used to separate natural frequency mode shapes from overall dynamic response of the structure.

Time-Domain analysis data can be used to animate the structure over a period of time. Time-domain analysis is 
     uniquely suited for transient, nonlinear, or frequency-variant events. For example, machine ‘run-up/coast-down’,
     shock   response or dynamic changes in mass, stiffness or damping during measurement periods.

A full report of each analysis is supplied in 'WORD'