| 摘要 |
According to the principles of the present invention, a ride-behind rotary mower having an advantageous construction is provided. The ride-behind rotary mower includes a mobile structure and a plurality of rotary mowing units. Each mowing unit consists of a mower deck, or cover, a rotary blade, and a plurality of acoustic Helmholtz resonators disposed around the periphery of the mowing unit, with an orifice tube positioned adjacent to the travel of the rotary cutting blade. Each resonator is constructed and tuned such that its resonant frequency is generally equal to the blade pass frequency of the rotary blade during normal operation. As such the resonators will generally reduce the noise of the mower during normal operation.
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