Aerospace accelerometers for engine vibration monitoring

Accelerometers measure the levels of vibration in an engine or system. They detect faults and prevent potential damage.

Helping you reduce downtime and increase your aircraft availability

To enable you to achieve the reliability and accuracy you need for your engine, aircraft, helicopter, UAS and space application, we’ve designed our accelerometers to optimise the engineering of sensing and transmissions elements.

They are based on the piezoelectric principle: compression or shear force applied to a piezoelectric material by a seismic mass creates electrical charges proportional to the applied vibration acceleration, without any moving part.

Built on over 60 years of experience, these highly accurate piezoelectric accelerometers are a dependable choice for a wide range of aerospace programmes, from cryogenic to high pressure turbine applications. The vast majority of current transport aircraft rely on our accelerometers to monitor the condition and health of their engines.

At Meggitt Switzerland, we can provide you with proven solutions for complete vibration measurement chains in virtually any aerospace environment. Such is our experience that for some extreme applications on the turbine section of particular engines, we lead the market worldwide in producing sensors that are accurate and reliable enough to meet manufacturers’ requirements.

Features and benefits

  • Custom designs
  • Hermetically sealed construction
  • Stainless steel, titanium or Inconel housing
  • Extreme operation temperatures (-253°C to +780°C)
  • Accurate signal for all frequency ranges
  • Various types of low noise cables to ensure proper signal transmission over the whole temperature range
  • Single and dual channel RCC with built-in test element for conversion of charges to voltage or current output (-54°C to 120°C).

Applications

Our aerospace vibration sensors are ideally suited to jet engine (civil and military), helicopter and space applications:

  • Gas turbine engine monitoring, including engine cold fan trim balancing (CFTB)
  • Airframe structure vibration analysis
  • Gearbox analysis
  • Bearing analysis
  • Health and usage monitoring systems (HUMS)
  • Rotor trim and balance
  • Propeller balancing
  • Auxiliary power unit monitoring
  • Cryogenic environments on space applications.

How does an accelerometer work?

The electrical charges generated by the accelerometer sensing element need to be converted into a voltage or current output for further processing. Depending on the application, this is performed either directly inside the accelerometer (integrated electronics piezoelectric – IEPE standard) or further away on the measurement chain (for high temperature locations). In that case, the use of a special “low noise” cable to reliably convey the electrical charges up to a remote charge converter (RCC) is necessary.

At Meggitt, we can provide you with a sensing and monitoring solution that is specific to your aerospace application and can be further customised to your particular requirements. To discuss what you need in more detail, contact us.