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AudioAcoustics

Serving the Acoustics Community Since 1994

Cross-Spectrum Acoustics Inc. offers Sound & Vibration Consulting Services

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Mar 10, 2008

NTI has scheduled another FTA Noise & Vibration Impact Assessment course for March 18-20 in Oakland California. I won’t be helping out this time but Lance will treat you right.

FTA developed (and when I say “FTA developed” I mean “FTA paid NTI who paid HMMH who paid me to revamp”) a noise prediction spreadsheet for use in the general assessment phase of the noise analysis. FTA also has a general assessment procedure for rail that involves picking vibration levels for various sources off of plot in the FTA manual. When doing the course vibration exercises I found that I got slightly different answerers each time I worked a problem because I would pick a slightly different value from the plot. To make things easier on myself, I whipped up a small program that provides the reference vibration level for a specific source at a given distance and speed.

Of course I couldn’t just build a utility to pick plots off a plot… I spent a little extra time and built an advanced mode that you can use to predict vibration levels using the FTA general assessment procedure. The utility doesn’t provide guidance as to how to make predictions; I assume that anyone who uses this utility knows what they are doing. If you don’t, please don’t try to use this utility - spend some coin and hire a professional. There are some real good ones out there.

This utility is provided AS-IS without warranty of any kind. This utility has NOT been commissioned or endorsed by the Federal Transit Administration. Please direct all inquiries to me.

Download:     Mac Version    | Windows Version


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Man Fed Up With Construction Noise Brandishes Weapon:

A man who told sheriff’s deputies that he couldn’t sleep because of the backup beep of a truck at a nearby construction site is accused of brandishing what looked like a handgun at the workers.

I’ve heard a similar story while working as a noise-enforcement officer for a construction project. When responding to a noise complaint, the contractor supervisor came over to me and immediately offered to do everything in his power to address the noise complaint. As you might guess, it’s pretty unusual for any contractor to care about anything other than the immediate task at hand, so his responsiveness was welcome.

After we got everything worked out, the contractor revealed the reason for his concern - at a previous job, he and his crew had been threatened at gunpoint for making too much noise at night. As a wise man once said, “You can get much farther with a kind word and a gun than you can with a kind word alone.”


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