Department of Mechanical Engineering

Enquiries and bookings

Mrs Gillian Elsworth
Centre for Power Transmission and Motion Control
Department of Mechanical Engineering
University of Bath
Claverton Down
Bath BA2 7AY


Tel: +44 (0)1225 386371


FPN - Noise in hydraulic systems

This special course can be run on request either in Bath or at the customer's premises. It provides a description of the mechanisms by which fluid-borne noise is generated and transmitted. Experimental methods for measuring the fluid-borne noise characteristics of pumps and other components are discussed, methods for reducing noise are outlined, and methods for predicting the fluid-borne noise characteristics of hydraulic circuits are explained.

Who should apply

Professional engineers, hydraulic system designers, and specialists concerned with noise problems. Attendees should be familiar with hydraulic systems and possess good mathematical knowledge.

Further details

Upon completion, participants should be able to do the following:

  • Understand the problems associated with noise in hydraulic systems
  • Be familiar with common noise terms, interpret noise measurements, and know how to represent the results in different ways
  • Analyse the causes for fluid borne noise, and take corrective action
  • Understand the behaviour of waves in a pipe both mathematically and qualitatively
  • Appreciate the effect of cavitation
  • Use flow-impedance modelling (FIM) for predicting the pressure and flow ripple in hydraulic systems
  • Be familar with the secondary Source method for measuring pump fluid-borne noise characteristics.

Details of the course content can be changed depending on the delegates' interests. Core topics that will be covered include:

  • Overview of hydraulic systems
  • Introduction to noise in hydraulic systems
  • Pumplow ripple
  • Pump flow ripple
  • Wave propagation
  • Cavitation
  • Introduction to flow-impedance modelling (FIM)
  • Fluid borne noise reduction
  • Rating of pump fluid borne noise
  • Pressure transducers, accelerometers and flowmeters
  • Measuring fluid-borne noise characteristics using the secondary source method
  • Airborne and structure noise
  • Measurement of impedance and transfer matrix of components
  • Flow/impedance modelling
  • FIM Case Study.