System for active noise reduction
US6832973B1 · kind B1 · utility
Inventor
Key dates
| Filing date | Jul 21, 2000 |
| Grant date | Dec 21, 2004 |
| Priority date | — |
| Expiry date | Jul 21, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S475/904
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An apparatus and method to minimize acoustic vibration in a vehicle due to impulsive gear clash loads. Sensors are mounted on the vehicle and are used to sense vehicle vibration generated by the gear clash loads. A first gear, having a plurality of teeth and a second gear, also having a plurality of teeth, are disposed such that upon rotation of the first and second gears, certain ones of the second gear teeth mesh with certain ones of the first gear teeth. An actuator, which is coupled to the first gear, drives the first gear and generates torque pulses. A controller is coupled to the actuator and controls the torque pulses that are transmitted to the first gear. The torque pulses generated by the actuator are adjusted in magnitude and phase so that the first gear teeth vibrate at a predetermined frequencies thereby reducing vibrations and peak tooth loading caused by the meshing of the first gear teeth and the second gear teeth.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.