Project Sponsor URL:  www.irco.com

Project Bellringer Group C

PSU SoundCorp

Date: Fall 2003

EXECUTIVE SUMMARY

Ingersoll-Rand is a leading manufacturer of construction and mining equipment.   Ingersoll-Rand currently manufactures the SD-100 asphalt/soil roller for the construction and maintenance of highways.  Ingersoll-Rand has a large European market for the rollers and must modify their equipment to meet changing European sound directives that will be effective in 2006. 

This project focused on the vibrating drum of the SD-100 asphalt/soil roller.  The acoustic radiation being emitted from the large drum is too high and must be reduced to meet the European sound directive, 2000/14/EC.  In other words, the machine’s drum makes to much noise. 

PSU SoundCorp was responsible for collecting data from the SD-100 roller that would be able to show a relationship between the vibration and noise of the drum’s surface.  After collecting the data, frequency plots were produced to show any possible relationship between sound and vibration of the drum’s surface. The acoustic and vibratory frequency spectrum plots were created by the use of an accelerometer, sound probe, and SigLab; a program to visually observe vibration.  The data was analyzed to show that there were three dominant frequencies.  These were 420, 670, and 817.5 Hz.P

PSU SoundCorp additionally suggested some methods of attenuating the frequencies that were chosen as dominant.  Using a decision matrix to determine which method would be most suitable, PSU SoundCorp suggested that Ingersoll-Rand change the design of the drum by incorporating stiffing ribs that spiraled along the inside of the drum.  The project concluded with a presentation of the findings to Ingersoll-Rand and Penn State.

Project Team:

Micah Irwin

Alan Peters

Jon Dager

Chrisitan Pastrana

Faculty Coach:

Dr.  John Lamancusa - Department of Mechanical Engineering