accelerometers

How to avoid a ground loop – It’s not only a problem with accelerometers
How to avoid a ground loop – It’s not only a problem with accelerometers

How to avoid a ground loop – It’s not only a problem with accelerometers

When using modern, high technology measurement devices one can often be tripped up by the simplest things. The most common is the ground loop. Time and again this issue rears its head. So, let’s talk about how to avoid a…

How Do I Calibrate An Impact Hammer?
How Do I Calibrate An Impact Hammer?

How Do I Calibrate An Impact Hammer?

The intention of this article is not to present any new scientific theories or ground breaking techniques, but to introduce new users to hammer impact testing and remind seasoned technicians of a method of how to calibrate an impact hammer and/or verify the…

What Is A Hammer Test Or Hammer Impact Test?
What Is A Hammer Test Or Hammer Impact Test?

What Is A Hammer Test Or Hammer Impact Test?

This is often also known as Modal Testing. It is a method of testing that allows us to calculate the natural frequencies (modes), modal masses, modal damping ratios and mode shapes of a test structure. This is commonly done using either…

Vibration : Measure Acceleration, Velocity or Displacement?
Vibration : Measure Acceleration, Velocity or Displacement?

Vibration : Measure Acceleration, Velocity or Displacement?

When using vibration data, especially in conjunction with modelling systems, the measured data is often needed as an acceleration, as a velocity and as a displacement. Sometimes different analysis groups require the measured signals in a different form. Clearly, it is impractical to measure all three at once even if we could. Physically it is nigh on impossible to put three different types of transducer in the same place.

A Simple Frequency Response Function
A Simple Frequency Response Function

A Simple Frequency Response Function

The following article will attempt to explain the basic theory of the frequency response function. This basic theory will then be used to calculate the frequency response function between two points on a structure using an accelerometer to measure the…

Acceleration, Velocity & Displacement Spectra – Omega Arithmetic
Acceleration, Velocity &  Displacement Spectra – Omega Arithmetic

Acceleration, Velocity & Displacement Spectra – Omega Arithmetic

Accelerometers are robust, simple to use and readily available transducers. Measuring velocity and displacement directly is not simple. In a laboratory test rig we could use one of the modern potentiometer or LVDT transducers to measure absolute displacement directly as static reference points are available. But on a moving vehicle this is not possible.

Measuring For Success With A Hammer Impact Test
Measuring For Success With A Hammer Impact Test

Measuring For Success With A Hammer Impact Test

The following application note shows the steps taken to perform a structural analysis using a hammer impact test on an automotive exhaust pipe structure with the aim of improving the structural damping properties of the exhaust pipe mount. This application…

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