Abstract
Sound power and dynamic pressure measurements were used to identify where noise is generated by a single spindle lawnmower deck. The sound power measurements were performed with different blades and deck profiles to quantify the overall levels. An electric motor was used to turn the blade, and the measurements were made in a semi‐anechoic chamber over an absorptive surface. The test procedures outlined in ISO 11094 were used as a guideline. The microphones used for the dynamic pressure measurements were located on a two‐inch by two‐inch grid, one inch below the cutting plane of the mower. The dynamic pressure data were used to generate one‐third octave colormaps and movies of the pressure distribution under the mower deck. The colormaps and movies identified local hot spots where noise is generated, and they were able to distinguish between blade and deck configurations with a difference of two dB in the sound power level. [The work was completed to fulfill the requirements for a Masters Degree from The Pennsylvania State University Graduate Program in Acoustics. Dr. Jerry Lauchle was my advisor for the project.]
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