Faculty Advisor

Norton, Robert L.


This project focuses on the reduction of audible noise emitted from an assembly machine at the sponsoring company. We modeled the system initially using assumed and calculated values, and the simulated data reflects the displacement, velocity, and acceleration in the system. A comparison of the tested and simulated data verified that the model does accurately portray the system's dynamic behavior, minus the impact events. Given the relationship between emitted noise and kinetic energy, the source of the audible noise problem was the high velocity impacts on the hard stops. We achieved the desired positions and velocities through redesign of the cams that generate system motion. Following the production of new cams and the gathering of data after installation, a comparison to the original experimental data showed a large decrease in peak accelerations. The comparison indicates that the new cams provide a significant improvement over the old cams. Peak accelerations at the hard stops were decreased which corresponds to a drop in velocity at impact. This resulted in lower emitted noise as measured on a sound level meter. According to the originally outlined goals, this project provides a successful solution to the problem encountered by the sponsor.


Worcester Polytechnic Institute

Date Accepted

January 2008


Mechanical Engineering

Project Type

Major Qualifying Project