Strain Gauge Basics – Part 2 – Shunt Calibration

As mentioned in the previous post, in order to relate the measured voltage difference across the bridge circuit to a strain measurement, we need a way of calibrating the system. In most systems, including the Prosig acquisition systems, this is done by including a high-precision shunt resistor across one of the legs in the bridge. For example, the following diagram shows a quarter-bridge circuit with a shunt calibration resistor, RS, across the bridge completion resistor R2.

Bearing & Gearbox Vibration Analysis Using Demodulation Techniques (Part 1)

Bearings and gearbox vibration are fundamental issues for rotating machines in many industrial applications. These are critical components; any failure can prove expensive in repair costs and downtime. Because of…

Strain Gauge Basics – Part 1

The use of strain gauges with Prosig’s data acquisition systems is well understood and has been used in many real-world applications over the years [see What Is A Strain Gauge?…

The Spectrum of Coloured Noise: Beyond White and Pink – Applications and Historical Context

Introduction The auditory world around us is filled with various types of noise, and while some are simply distracting or annoying, others serve practical purposes. You're probably familiar with the…

Impact Hammer Double Hit – An Investigation

An Impact Hammer double hit is viewed as a common problem, and most hammer impact testing software offers a "Double hit" rejection function. Signals captured with double impacts are not…

A Guide To Resonance

Welcome to our latest blog post, where we delve into the fascinating world of resonance and natural frequency! Over the years, we've consistently noticed that our articles exploring these topics…

Some Basic Vibration Signal Qualities

This article discusses quantifying basic vibration signals from three aspects: signal type, signal level, and signal display format. Mathematical expressions and typical applications are also introduced. A simple harmonic vibration…

Fig1: Basic Workflow

Automated data capture, analysis and reporting

This post deals with automated data capture and analysis of data. It uses Prosig's DATS software and the worksheet environment it provides. The technique could be duplicated in other software…

Are My Hammer Impact Results Valid? (3) Time Invariance

As mentioned in our previous two articles, when performing experimental modal testing of a structure or component using impact (or ping) testing, it is important to consider and verify the…

Accelerometer Selection – How To Choose An Accelerometer

Since DJB joined Condition Monitoring Technology Group (CMTG) in 2021 we have been able to bring new knowledge and capability to the group, especially when working alongside Prosig. We have…

Are My Hammer Impact Results Valid? (2) Reciprocity

As mentioned in our previous article, when performing experimental modal testing of a structure or component using impact (or ping) testing, it is important to consider and verify the validity…

Accelerometer Cable Selection

The difference between Low noise and Non-Low noise accelerometer cables. It is important to use the correct cable when using accelerometers. A charge output accelerometer must be used with a…

Are My Hammer Impact Results Valid? (1) Linearity

When performing experimental modal testing of a structure or component using impact (or ping) testing, it is important to consider and verify the validity of any results. A modal analysis…

Mass loading is the phenomenon whereby the mass of the Accelerometer alters the natural frequency of the test subject The video below demonstrates the phenomenon of mass loading and the…

Hammer Testing: Free or fixed support?

A vital question to be asked before performing hammer testing is - how do I support the testing object? What fixing mechanism to use? Or technically, what are the desired…

Rotational Analysis with no Tachometer Data

The identification of cyclic events in rotational analysis is often key to identifying problems. It is good practice to use a suitable sensor for capturing rotational speed. However, this is…

titanium and steel gears and cogwheels

Analysis of Dynamic Engine Vibration – Angular Vibration in High Performance Engines

The analysis of dynamic engine vibration and the accurate measurement of angular vibration is a non-trivial task, as a more in-depth analysis of boundary conditions reveals. Tools for engine vibration…

Tire background texture

Using Source Contribution Analysis to analyze complex structural dynamics issues

Using Source Contribution Analysis (SCA) and Structural Animation (STA) in the DATS software for the analysis of complex structural dynamics This post uses Source Contribution Analysis (SCA) techniques and a…

Vehicle AC

Analysis of Airflow Instabilities in HVAC units

HVAC (Heat Ventilation Air Conditioning) units are devices used in various applications, such as cars, buildings, aircraft etc. They facilitate the transport and conditioning (heating, cooling, changing of humidity) of…

How Do I Upsample and Downsample My Data?

This post covers how to upsample and downsample data and the possible pitfalls of this process. Before we cover the technical details let us first explain what we mean by upsample…

What Are Vibration, Torsional Vibration & Shaft Twist?

When analyzing rotating shafts some terms are often confused. This post will attempt to explain the differences. So, what are vibration, torsional vibration and twist? What is Vibration? We measure at…

The Effect of the Nyquist Theory on Rotational Order Analysis

Nyquist theory is generally understood, but this understanding usually relates to time sampling and the conversion to the frequency domain. Rotational order analysis and the effect of the Nyquist frequency…

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…

business man hand tablet computer and nuclear power plant background

Seismic Qualification Testing (Part 1)

Seismic Qualification Testing for US Nuclear Power Generating Stations Part 1 (Random Vibration Testing) The nuclear power industry in North America (USA, Canada & Mexico) requires seismic qualification testing for…