Advanced Concept Development Engineer: Techtronic Industries

The goal of this project was to evaluate current electric blowers, hedge trimmers, chainsaws, polesaws, and string trimmers and create concepts to reduce the sound pressure level.
The project was sectioned to first evaluate baseline performance of products, evaluate contribution of specific sources of noise, note transmission paths to the receiver, develop concepts specific to each product, rapid prototype components, and complete testing to validate designs.
Finalized prototypes had a reduction of sound pressure level of 5-10 dB(A) utilizing technology that limits a reduction in performance. Design calculators and 30+ page report was created to pass on knowledge to current project engineers to work toward.

Top — Fast Fourier Transform sound testing data of 40V String Trimmer in semi-anechoic chamber. Bottom Left — Iteration of an axial fan design utilizing asymmetric blades and reviewing isosurfaces of Turbulent Kinetic Energy (TKE).
Bottom Right — Helmholtz resonator design to attenuate blade pass frequency and other trouble frequencies in 40V Handheld Blower.