Electric Motors: Dynamic/Online Testing

In a previous post I discussed electric motor testing, specifically static or offline testing. This week I would like to tackle the subject of dynamic or online testing of electric motors. As the name suggests, dynamic tests are performed while the electric motor is running i.e. when it…

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Vibration Suppression: Active and Passive Systems

Machines are expected to vibrate as little as possible to avoid component fatigue/failure and in some cases, reduce user comfort level, for example, violent vibration of an automobile can lead to mechanical failure and driver discomfort. There are ways to avoid violent vibration such as…

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Electric Motors: Static/Offline Testing

Electric motors are a key component for running machines in most industrial environments. Therefore it is important that they are properly monitored to avoid unwanted failures or shutdowns. Typically, there are two testing categories for electric motors: 1. Static or offline tests 2. Dynamic or…

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Ways to Reduce Boat Vibration and Noise

Some boats vibrate more and make a lot of noise. Vibration and noise in boat require immediate attention. Vibration and noise are related; vibration generates unwanted noise. Below are some ways to decrease vibration and noise on your boat: Boat PropellersOne of the most common…

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Signal Processing: Aliasing

Aliasing is a phenomenon that can occur due to improper sampling or data collection, where the original signal is indistinguishable when reconstructing data from the collected samples. This usually occurs because the sampling rate and/or resolution is inadequate. Figure 1 shows an example of aliasing. The original…

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Statistical Analysis: Random Vibration

There are two vibration situations in which statistical analysis is useful. The first situation occurs when the vibration amplitude of a system appears to be random in time. In this case, it is convenient to describe the response of the system statistically. This form of…

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Product Design: Performance vs Constraints

Every product starts out on the drawing-board with a set of objectives that define what the product must accomplish. Before clearly setting objectives for the design, it is critical to understand the constraints that may prevent it from achieving all the intended goals. Constraints inherently…

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Future of Condition Monitoring

The ultimate goal of condition monitoring is to increase profitability by lowering maintenance costs and minimizing downtime. The goal can be achieved by making required changes to make sure that equipment is more reliable. The machines should be monitored every period of time to detect…

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Spectral vs Waveform Data

Spectral data is displayed in the frequency domain while waveform data is in the time domain. Spectral information is obtained by applying a Fourier transform to waveform data; this converts the data to show that amplitude and phase of the vibration at different frequencies. Both…

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