Application Case Studies

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• A Simple Automotive Noise Test
• Analysis of Airflow Instabilities in HVAC units
• Analyzing Shaft Twist And Repairing Damaged Tachos

• Basics of Vibration Analysis: A Technical Dive
• Building a new test model

• Comparing Vibration On Bicycle Suspension
• Creating An End of Line Vibration Test System

• Developing an Algorithm for Tick Detection
• Do You Need To Measure Brake Noise?

• Electric Vehicles – Vibration & Acoustic Testing
• Engine Model Being Put Through Its Paces
• Evaluating A Closed Loop Control System For High Pressure Pumps
• Exhaust Vibration Measurement – A Case Study

• Fatigue & Durability Testing

• How Do I Calibrate An Impact Hammer?
• How do we design or modify a system to avoid resonance?

• In-situ balance of an Open Cycle Gas Turbine
• In-Vehicle Voltage Supply From Cigar Lighter / Accessory Sockets
• Is Orchestral Noise Damaging Hearing?

• Measuring Exhaust Noise Using A P8000 System
• Measuring For Success With A Hammer Impact Test
• Measuring Torsional Crank Shaft Jitter
• Measuring Torsional Twist & Vibration Along a Shaft or Through a Geartrain
• Measuring Torsional Vibration 101
• Methods To Remove Spikes From Data
• Modal Analysis in the Real World

• Non-Linear Calibration Curve And Polynomial

• Processing pump data – a classic case of amplitude modulation
• Prosig supply high channel count data acquisition system to new RAL Space NSTF facility

• Rotating Machinery Test Rig
• Rotating Machinery Vibration Analysis: Keeping Your Machines Humming Along

• Seismic Qualification Testing (Part 1)
• Shaft Displacement Measurement Using A PROTOR System
• Sound Steering

• Testing Times : Why & How We Measure Noise & Vibration
• The Intelligent Way To Sort, Extract & Analyze Signals
• Tools for motorcycle dynamics analysis

• Understanding & Measuring Noise
• Understanding CAN Bus: The Nervous System of a Modern Vehicle
• Using Source Contribution Analysis to analyze complex structural dynamics issues
• Using Your VCM To Monitor Auxiliary Equipment

• Vibration Condition Monitoring Doesn’t Get More Mobile Than This!
• Vibration Condition Monitoring Using Your Android Smartphone
• Vibration Control and Isolation: A Comprehensive Guide for Engineers
• Vibration Measurement Techniques: A Comprehensive Guide

Signal Processing & Algorithms

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• A Different Way Of Averaging – Time Synchronous Averaging
• A Guide To Digital Filtering
• A Guide To Resonance
• A Method Of Diagnosing Cyclic Events In An Internal Combustion Engine
• A Simple Frequency Response Function
• A Simple Step-by-step Guide To Bearing Vibration Analysis
• A Weighting. And B. And C.
• Acceleration, Velocity & Displacement Spectra – Omega Arithmetic
• Aliasing, Orders and Wagon Wheels
• Amplitude And Energy Correction – A Brief Summary
• Analysis of Airflow Instabilities in HVAC units
• Analysis of Dynamic Engine Vibration – Angular Vibration in High Performance Engines
• Analyzing Shaft Twist And Repairing Damaged Tachos
• Are My Hammer Impact Results Valid? (1) Linearity
• Are My Hammer Impact Results Valid? (2) Reciprocity
• Are My Hammer Impact Results Valid? (3) Time Invariance
• Audio Equalisation Filter & Parametric Filtering
• Automated data capture, analysis and reporting
• Average Waterfalls Or Average Orders?
• Averaging Frequency Response Functions From A Structure

• Basics of Vibration Analysis: A Technical Dive
• Bearing & Gearbox Vibration Analysis using Demodulation Techniques? (Part 2)
• Bearing & Gearbox Vibration Analysis Using Demodulation Techniques (Part 1)

• Calculating Velocity Or Displacement From Acceleration Time Histories
• Cleaning Up Data
• Converting Acceleration, Velocity & Displacement
• Creating An End of Line Vibration Test System

• Data Smoothing : RC Filtering And Exponential Averaging
• Data Windows : What, why and when?
• Developing an Algorithm for Tick Detection
• Do Missing Tachometer Pulses Mean The End Of The Road For Your Test?
• Does The Signal Have A Gaussian Probability Density?
• Don’t Let Spikes Spoil Your Data
• Dynamic Range And Overall Level : What Are They ?

• Evaluating A Closed Loop Control System For High Pressure Pumps
• Example of performing a Moving Average
• Examples Of Event Extraction And Removal
• Examples of Structural Animation
• Exhaust Vibration Measurement – A Case Study

• Fatigue & Durability Testing

• Generating speed v time information from noise & vibration signals

• Hammer Testing: Free or fixed support?
• High Dynamic Range – Fact or Fiction?
• High Pass Filtering And Tacho Signals
• How Do I Calibrate An Impact Hammer?
• How Do I Convert Between Acceleration, Velocity & Displacement?
• How Do I Convert To Decibels?
• How Do I Downsample Data?
• How do I find the natural frequency of an inlet manifold?
• How Do I Measure Whole Body Vibration?
• How do I perform vibration analysis on a cylinder head and inlet manifold?
• How Do I Upsample and Downsample My Data?
• How do we design or modify a system to avoid resonance?
• How Many Samples Per Revolution Are Required To Study A Particular Order
• How To Analyze & Measure Torsional Vibration
• How To Analyze Noise & Vibration In Rotating Machines
• How To Calculate A Resultant Vector
• How To Choose A Sample Rate For A Required Analysis Frequency Range
• Human Exposure To Vibration In Buildings (DIN 4150-2:1999-06 & DIN 45669-1:1995-06)

• Impact Hammer Double Hit – An Investigation
• Interpolation Versus Resampling To Increase The Sample Rate
• Interpretation of the Articulation Index
• Is Orchestral Noise Damaging Hearing?
• Is That Tone Significant? – The Prominence Ratio

• Measure Vibration – Should we use Acceleration, Velocity or Displacement?
• Measuring Exhaust Noise Using A P8000 System
• Measuring For Success With A Hammer Impact Test
• Measuring Torsional Crank Shaft Jitter
• Measuring Torsional Twist & Vibration Along a Shaft or Through a Geartrain
• Measuring Torsional Vibration 101
• Methods To Remove Spikes From Data
• Modal Analysis in the Real World
• Multiplane Balancing – Zero Imbalance or Specified Imbalance

• Negative Frequencies – What Are They?
• Noise & Vibration Analysis: Back To Basics
• Non-Linear Calibration Curve And Polynomial

• Order Cuts And Overall Level
• Order Tracking, Frequency and Hertz
• Orders v Time – Comparing Overall Levels

• Phase Angle Between Signals
• Pick of Twitter #1 – Acoustics – October 2016
• Processing pump data – a classic case of amplitude modulation

• Quantifying Signals – Peak, Peak-to-Peak, & RMS metrics

• Real World Noise & Vibration Measurement – An Interview
• Reference frequency for third octave filters
• Relative signal levels of a sinusoid with and without background noise
• Removing A-Weighting From Time History Signals
• Removing Phase Delay Using A Phaseless Filter
• RMS From Time History And FFT Spectrum
• Rotating Machinery Vibration Analysis: Keeping Your Machines Humming Along
• Rotational Analysis with no Tachometer Data

• Sampling and Filtering Data for ISO8041 Compliance and Human Body Vibration Data Weighting
• Seismic Qualification Testing (Part 1)
• Shaft Displacement Measurement Using A PROTOR System
• Some Basic Vibration Signal Qualities
• Sound Steering
• Spectrum Smoothing : Why and How?
• Speech Articulation Index – What Does It Mean?
• Standard Octave Bands
• Strain Gauge Basics – Part 1
• Strain Gauge Basics – Part 2 – Shunt Calibration

• “The History and Future of Fourier Analysis” Workshop at SAE 2015, Grand Rapids
• Testing Times : Why & How We Measure Noise & Vibration
• The Causes of Road Noise
• The Effect of the Nyquist Theory on Rotational Order Analysis
• The Intelligent Way To Sort, Extract & Analyze Signals
• There are tachometer signals available on the vehicle CAN-bus. Can I use these signals instead of connecting my own tachometer signal?
• Three Methods For Analyzing Vibration In Rotating Components
• Time Varying Overall Level Vibration (or Noise)
• Tools for motorcycle dynamics analysis
• Torsional Vibration, Tacho Pulses And Aliasing

• Understanding & Measuring Noise
• Understanding Filter Characteristics
• Understanding Phase Measurements
• Understanding The Cross Correlation Function
• Understanding the Importance of Transducer Orientation
• Understanding Windowing And Overlapping Analysis
• Using Source Contribution Analysis to analyze complex structural dynamics issues

• Vibration Control and Isolation: A Comprehensive Guide for Engineers
• Vibration Measurement Techniques: A Comprehensive Guide
• Vibration Monitoring Phase Measurement And The Tacho Signal
• Video: Noise & Vibration From Rotating Machines
• Viewing Operational Deflection Shapes (ODS) from a Gas Turbine Generator
• [Video] How To Analyze Noise & Vibration From Rotating Machines

• Waterfall Analysis: Frequency Resolution and Smearing
• Waterfall Analysis: Frequency Spectrum or Order Spectrum?
• What Are AC and DC Coupling?
• What Are dB, Noise Floor & Dynamic Range?
• What Are Vibration, Torsional Vibration & Shaft Twist?
• What Can I Do About Spikes In My Data?
• What engineering decisions are made by measuring a power spectrum?
• What is “waterfall smearing”?
• What Is A Fourier Transform?
• What Is A Load Spectrum?
• What Is Amplitude Quantization Error?
• What is Auto Spectral Density?
• What is Operating Deflection Shape (ODS) Analysis?
• What Is Resonance?
• What is Resonance? (Part 2)
• What Is Resonance? (Part 3)
• What is Source Contribution Analysis (or SCA)?
• What is Synchronous (Angular) Sampling?
• What is the difference between Operating Deflection Shapes (ODS) and Operational Modal Analysis (OMA)?
• What Is The Difference Between Single Ended & Differential Inputs?
• What is the difference between Transfer Path Analysis (TPA) and Source Contribution Analysis (SCA)?
• What is the maximum analysis frequency for a waterfall in DATS?
• What is waterfall frequency spacing? And how does the DATS parameter ‘Requested Frequency Spacing’ work?
• What Sample Rate Do I Use To Measure Whole Body Vibration?
• Where Does The Noise In A Signal Come From?
• Which Should I Use? Real & imaginary? Or magnitude & phase?
• Why is the microphone pressure reference 2*10^-5 Pascals?
• Wide Band Integrators – What Are They?