Noise emission reduction system
AssigneeVolvo Truck Corporation
InventorsSuresh Prabu Vellaiyandi, Soorya R
Life of this patent
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Abstract
A noise emission reduction system includes a solenoid couplable to a shielding member, and to a frame of a vehicle. The solenoid is controllable to induce vibration of the shielding member in relation to the frame of the vehicle. A microphone is configured to receive sound emitted by a noise source. An accelerometer is couplable to the frame and a controller is coupled to the solenoid, to the microphone, and to the accelerometer. The controller is configured to: receive a first signal from the accelerometer; receive a second signal from the microphone; determine a control signal for the solenoid based on the first signal and the second signal; and control the solenoid using the determined control signal to induce vibration of the shielding member in relation to the frame.
Claims13
A noise emission reduction system comprising:
- a shielding member configured to at least partly surround a noise source comprised in a vehicle, the shielding member being a sandwich construction comprising metal sheets and sound dampening material arranged between the metal sheets;
- a solenoid couplable to the shielding member, and to a frame of the vehicle, the solenoid being controllable to induce vibration of the shielding member in relation to the frame of the vehicle, when the solenoid is coupled to the shielding member and to the frame;
- a microphone configured to receive sound emitted by the noise source;
- an accelerometer couplable to the frame;
- and
- a controller coupled to the solenoid, to the microphone, and to the accelerometer, the controller being configured to:
- receive a first signal from the accelerometer;
- receive a second signal from the microphone;
- determine a control signal for the solenoid based on the first signal and the second signal;
- and
- control the solenoid using the determined control signal to induce vibration of the shielding member in relation to the frame, when the solenoid is coupled to the shielding member and to the frame,
- wherein the controller is configured to determine the control signal in such a way that the control signal results in the solenoid inducing vibration of the shielding member substantially in anti-phase with the sound emitted by the noise source, when the solenoid is coupled to the shielding member and to the frame.
A method for reducing noise emission in a vehicle comprising a frame, a noise source, and a shielding member at least partly surrounding the noise source, the shielding member being a sandwich construction comprising metal sheets and sound dampening material arranged between the metal sheets, the method comprising:
- receiving, by a controller from an accelerometer coupled to the frame, a first signal indicative of vibration of the frame;
- receiving, by the controller from a microphone arranged to receive sound emitted by the noise source, a second signal indicative of the sound emitted by the noise source;
- and
- controlling, by the controller, based on the first signal and the second signal, a solenoid coupled to the frame of the vehicle and to the shielding member to induce vibration of the shielding member in relation to the frame of the vehicle, the vibration being substantially in anti-phase with the sound emitted by the noise source.
Dependencies are inferred from the claim text.