Noise reducing system for a tracked vehicle and tracked vehicle

Patent metadata

Field	Value
Publication number	US-11267337-B2
Application number	US-201716078511-A
Country	US
Kind code	B2
Filing date	Feb 23, 2017
Priority date	Feb 23, 2016
Publication date	Mar 8, 2022
Grant date	Mar 8, 2022

Abstract

A noise reducing system for a tracked vehicle, the tracked vehicle comprising a cab and at least one track that extends along a direction of travel of the vehicle and comprises at least a plurality of bars, such as metal bars, transverse to the direction of travel. The noise reducing system comprising a control unit and an acoustic wave emitter connected to the control unit for being controlled by the control unit, the noise reducing system comprising an acoustic input and being configured to emit an acoustic equalization wave, phase shifted with respect to the noise and determined on the basis of the acoustic input, to reduce the noise, in particular the noise generated by the tracks.

First claim

The invention is claimed as follows:

1. A noise reducing system for a tracked vehicle comprising a cab and at least one track that extends along a direction of travel of the tracked vehicle, the at least one track comprising a plurality of bars transverse to the direction of travel of the tracked vehicle, the noise reducing system comprising:
a control unit;
an acoustic input;
an acoustic wave emitter connected to and controlled by the control unit, the acoustic wave emitter configured to emit an acoustic equalization wave to reduce a noise generated by the at least one track, the acoustic equalization wave being phase shifted with respect to the noise and being determined based on the acoustic input;
an input configured to receive a signal correlated to a speed of travel of the tracked vehicle, wherein to reduce the noise, the emitted acoustic equalization wave is based on the signal correlated to the speed of travel of the tracked vehicle; and
a memory device that stores a plurality of pairs of values, wherein each pair of values comprises a speed value of the tracked vehicle and a frequency value of the acoustic equalization wave associated with the speed value, and the control unit is connected to the memory device and configured to define a frequency of the emitted acoustic equalization wave based on one of the pairs of values selected based on the signal correlated to the speed of travel of the tracked vehicle.

2. The noise reducing system of claim 1 , wherein the acoustic input comprises a microphone connected to the control unit and configured to provide, to the control unit, a signal correlated to the noise.

3. The noise reducing system of claim 2 , wherein to reduce the noise, the emitted acoustic equalization wave is based on a phase of the signal correlated to the noise.

4. The noise reducing system of claim 2 , wherein the emitted acoustic equalization wave is based on an amplitude of the noise detected through the signal correlated to the noise.

5. The noise reducing system of claim 2 , wherein the emitted acoustic equalization wave is based on a frequency of the noise detected through the signal correlated to the noise.

6. The noise reducing system of claim 1 , wherein one of: the frequency of the emitted acoustic equalization wave and the frequency and an amplitude of the emitted acoustic equalization wave is based on the signal correlated to the speed of travel of the tracked vehicle.

7. The noise reducing system of claim 1 , wherein the input is further configured to receive a signal correlated to a speed, in revolutions, of an engine of the tracked vehicle, wherein to reduce the noise, the emitted acoustic equalization wave is based on the signal correlated to the speed, in revolutions, of the engine of the tracked vehicle.

8. The noise reducing system of claim 7 , wherein the frequency of the emitted acoustic equalization wave is based on the signal correlated to the speed, in revolutions, of the engine of the tracked vehicle.

9. The noise reducing system of claim 1 , wherein the input is further configured to receive a signal correlated to a radio signal of a radio system, wherein the emitted acoustic equalization wave is based on the signal correlated to the radio signal of the radio system so as not to reduce an audibility of the radio system.

10. The noise reducing system of claim 1 , wherein the acoustic wave emitter is configured to emit acoustic equalization waves within a frequency of ranges from 0 to 100 Hz.

11. The noise reducing system of claim 1 , wherein the acoustic wave emitter is configured to emit acoustic equalization waves within a frequency of ranges from 0 to 50 Hz.

12. The noise reducing system of claim 1 , wherein the acoustic wave emitter comprises a loudspeaker.

13. The noise reducing system of claim 12 , wherein the loudspeaker comprises a subwoofer type loudspeaker having a capacity of at least 20 liters of air.

14. The noise reducing system of claim 1 , wherein the plurality of bars of the at least one track comprise a plurality of metal bars.

15. A tracked vehicle comprising:
a cab;
at least one track that extends along a direction of travel of the tracked vehicle, the at least one track comprising a plurality of metal bars transverse to the direction of travel, wherein the plurality of transverse bars are spaced from one another by a designated pitch in a range from 100 mm to 160 mm;
a chassis connected to the at least one track and to the cab; and
a noise reducing system housed in the cab and configured to define a frequency of an emitted acoustic equalization wave based on the designated pitch, the noise reducing system comprising:
a control unit,
an acoustic input, and
an acoustic wave emitter connected to and controlled by the control unit, the acoustic wave emitter configured to emit the acoustic equalization wave to reduce a noise generated by the at least one track, the acoustic equalization wave being phase shifted with respect to the noise and being determined based on the acoustic input.

16. The tracked vehicle of claim 15 , further comprising a speed detector connected to the noise reducing system, wherein the noise reducing system is configured to receive a speed value of the tracked vehicle via a signal.

17. The tracked vehicle of claim 15 , further comprising an engine speed sensor connected to the noise reducing system, wherein the noise reducing system is configured to receive an engine speed value via a signal.

18. The tracked vehicle of claim 15 , further comprising a radio system connected to the noise reducing system, wherein the noise reducing system is configured to receive a signal associated with the radio system.

19. The tracked vehicle of claim 15 , wherein the plurality of transverse bars are spaced from one another by a designated pitch in a range from 118 mm to 144 mm.

20. The tracked vehicle of claim 15 , further comprising an elastic system configured to connect the cab to the chassis to dampen vibrations from the chassis to the cab.

21. The tracked vehicle of claim 20 , wherein the elastic system comprises at least one of a silent block and a gas spring.

22. The tracked vehicle of claim 15 , wherein the cab comprises a roof and a compartment obtained in the roof and inside the cab, the noise reducing system being housed in the compartment.

23. A noise reducing system for a tracked vehicle comprising a cab and at least one track that extends along a direction of travel of the tracked vehicle, the at least one track comprising a plurality of bars transverse to the direction of travel of the tracked vehicle, the noise reducing system comprising:
a control unit;
an acoustic input;
an acoustic wave emitter connected to and controlled by the control unit, the acoustic wave emitter configured to emit an acoustic equalization wave to reduce a noise generated by the at least one track, the acoustic equalization wave being phase shifted with respect to the noise and being determined based on the acoustic input;
an input configured to receive a signal correlated to a speed of travel of the tracked vehicle, wherein to reduce the noise, the emitted acoustic equalization wave is based on the signal correlated to the speed of travel of the tracked vehicle; and
a memory device that stores a plurality of sets of three values, wherein each set of three values comprises a speed value of the tracked vehicle, a frequency value of the associated acoustic equalization wave, and an amplitude

Assignees

• Prinoth Spa

Inventors

• Spadoni Riccardo
• Kirchmair Martin
• Spielman Gabriel

Classifications

• G10K11/17883 Primary

  the reference signal being derived from a machine operating condition, e.g. engine RPM or vehicle speed · CPC title

• B60K35/65

  Instruments specially adapted for specific vehicle types or users, e.g. for left- or right-hand drive · CPC title

• B60K35/80

  Arrangements for controlling instruments · CPC title

• B60K35/60

  Instruments characterised by their location or relative disposition in or on vehicles (arrangements of lighting devices on dashboards B60Q3/10) · CPC title

• B60K35/26

  using acoustic output · CPC title