Tag Archive: accelerometer

May 06

How Do I Convert To Decibels?

Much confusion revolves around linear and non-linear numbers. The following outlines the mathematical process to convert from a number expressed in dB to a linear quantity. How do we convert to decibels and back again?

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Dec 02

What Type of Accelerometer Should I Use? IEPE, Charge or Bridge-based?

What type of accelerometer should I use? What are the advantages/disadvantages of a charge mode accelerometer, an IEPE accelerometer and a bridge based accelerometer? There are so many types of accelerometer that is often difficult to know what type of accelerometer to use. An IEPE accelerometer will have a high pass filter at about 5Hz. …

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May 20

How do I find the natural frequency of an inlet manifold?

There are a number of ways to find the natural frequency (resonance) of a part like an automotive inlet manifold. Here are three different types of popular test technique. But which one should you use and why?

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May 15

How do I perform vibration analysis on a cylinder head and inlet manifold?

We were asked the following question… I want to perform some cylinder head and inlet manifold vibration analysis, what should I do? First we need to consider sensor selection

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Feb 08

Calibrating an Accelerometer with a Prosig P5000 system

Accelerometer calibration screen

Here we look at how to calibrate an accelerometer using a Prosig P5000 system. Put the wax on the shaker top. Place the accelerometer in the axis you wish to calibrate with positive up and cable connected to P5000 with the relevant transducer class chosen. Go to Single Channel Calibration screen. Click on the Tone …

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Nov 02

How do I balance a shaft?

image

“How do I balance a shaft?” seems like a fairly straightforward question, but there are a number of things that we need to understand first. Here we look at a number of key concepts that need to be understood in order perform balancing. What does balance mean? Well broadly speaking to balance a shaft, mass …

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Status update

After listening to customer feedback, we have completely re-engineered the DATS Hammer Impact software. The new version will ship with the next DATS update (not the soon-to-be-released V7.0.23). In the meantime you will be able to¬†download and preview the new package. You will of course need a P8000 system and a DATS licence with the Hammer Impact option enabled. (more…)

Jul 18

How Do I Get An XYZ Resultant Waterfall

Example worksheet calculating a resultant waterfall from x, y & z measurements from a triaxial accelerometer

A user has three signals captured using a triaxial accelerometer and asked “What is the simplest way to get the XYZ resultant from run-up file?” He had tried forming a resultant of the raw time histories, but didn’t fully understand the resultant time history. Of course, the correct way of processing the data is to …

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Jul 16

What is Source Contribution Analysis (or SCA)?

Some example results from SCA

How do you measure the causes of a noise or vibration with respect to several sources? Which source is causing what part of the response? For example, how does the noise inside the cabin of a vehicle relate to the engine noise or wheel hub noise and vibration?

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May 20

A Simple Step-by-step Guide To Bearing Analysis

A simple roller bearing

Generally when developing and testing bearings a simple step by step procedure should be followed.

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