CN118230711A - Active noise reduction method and system for engineering machinery and engineering machinery - Google Patents

Active noise reduction method and system for engineering machinery and engineering machinery Download PDF

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Publication number
CN118230711A
CN118230711A CN202410639697.0A CN202410639697A CN118230711A CN 118230711 A CN118230711 A CN 118230711A CN 202410639697 A CN202410639697 A CN 202410639697A CN 118230711 A CN118230711 A CN 118230711A
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China
Prior art keywords
noise
preset
noise reduction
engineering machinery
signals
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CN202410639697.0A
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Chinese (zh)
Inventor
董玉忠
倪翔宇
李亚东
徐玉兵
张芮
陈凯旋
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Xuzhou XCMG Excavator Machinery Co Ltd
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Xuzhou XCMG Excavator Machinery Co Ltd
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Priority to CN202410639697.0A priority Critical patent/CN118230711A/en
Publication of CN118230711A publication Critical patent/CN118230711A/en
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    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1785—Methods, e.g. algorithms; Devices
    • G10K11/17853—Methods, e.g. algorithms; Devices of the filter
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1781—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions
    • G10K11/17821—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions characterised by the analysis of the input signals only
    • G10K11/17823—Reference signals, e.g. ambient acoustic environment
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1783—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase handling or detecting of non-standard events or conditions, e.g. changing operating modes under specific operating conditions
    • G10K11/17833—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase handling or detecting of non-standard events or conditions, e.g. changing operating modes under specific operating conditions by using a self-diagnostic function or a malfunction prevention function, e.g. detecting abnormal output levels
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1787—General system configurations
    • G10K11/17879—General system configurations using both a reference signal and an error signal
    • G10K11/17881—General system configurations using both a reference signal and an error signal the reference signal being an acoustic signal, e.g. recorded with a microphone
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1787—General system configurations
    • G10K11/17879—General system configurations using both a reference signal and an error signal
    • G10K11/17883—General system configurations using both a reference signal and an error signal the reference signal being derived from a machine operating condition, e.g. engine RPM or vehicle speed
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/10—Applications
    • G10K2210/128—Vehicles
    • G10K2210/1282—Automobiles
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/30—Means
    • G10K2210/301—Computational
    • G10K2210/3028—Filtering, e.g. Kalman filters or special analogue or digital filters

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)

Abstract

The invention discloses an active noise reduction method and system for engineering machinery and the engineering machinery, wherein the method comprises the following steps: collecting operation parameters of the engineering machinery, and judging the current operation working condition and load of the engineering machinery according to the operation parameters; and calling a preset noise sample matched with the current operation working condition and load of the engineering machinery from a noise sample library, and playing the noise sample so as to achieve the purpose of active noise reduction. The active noise reduction method disclosed by the invention has the advantages of good transient response, good noise reduction effect, quick algorithm iteration and the like, greatly reduces the calculation performance requirement on the controller, and simultaneously reduces the volume and the cost of a hardware system.

Description

Active noise reduction method and system for engineering machinery and engineering machinery
Technical Field
The invention belongs to the technical field of noise reduction of engineering machinery, and particularly relates to an active noise reduction method and system for engineering machinery and the engineering machinery.
Background
The engineering machinery has the defects of severe operating conditions, large vibration and high noise during operation, technical bottlenecks exist in the passive noise reduction means, the noise reduction effect is not ideal, and a special engineering machinery active noise reduction system does not exist at present. The automobile industry often uses an active noise reduction system, so that the noise level of a passenger cabin can be reduced in real time according to noise signals, and the noise reduction effect is obvious.
Sound is actually a vibration wave of a sound transmission medium (air, liquid, solid), so active noise reduction is based on the phase cancellation principle of waves, and when two phases of sound waves are 180 degrees different, or they are mutually cancelled after being superimposed in opposite phases. The idea of active noise reduction is to record background noise, invert the noise signal to create "anti-noise", and then add it and send it out through the sound unit, so as to cancel the actual background noise. The biggest problem with active noise reduction techniques is that the ambient sound is accurately picked up to provide the greatest degree of noise attenuation, the noise must be captured by the microphone picking up the noise, and the cancellation waveform emanating from the sound generating unit must arrive at the ear simultaneously with the noise and be perfectly phase aligned.
ANC noise reduction (Active Noise Control) is used by the automotive industry. The working principle of ANC noise reduction (Active Noise Control) is that external environmental noise is collected through a microphone and then the system is converted into an inverted sound wave to be added to a loudspeaker end, and the two kinds of noise are overlapped to realize noise reduction. The defects of the prior art are mainly expressed in that: on one hand, the ANC active noise reduction system has high requirement on the calculation performance of the controller, and the hardware system has large volume and high cost; on the other hand, the working condition, noise signal and automobile difference of engineering machinery are obvious, the engineering machinery cannot be directly borrowed, the cab space is limited, and the miniaturization, integration and low-cost design of a hardware system are required.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides the active noise reduction method and system for the engineering machinery and the engineering machinery, which have the advantages of good transient response, good noise reduction effect, quick algorithm iteration and the like, greatly reduce the calculation performance requirement on a controller, and simultaneously reduce the volume and cost of a hardware system.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
In a first aspect, an active noise reduction method for an engineering machine is provided, including: collecting operation parameters of the engineering machinery, and judging the current operation working condition and load of the engineering machinery according to the operation parameters; and calling a preset noise sample matched with the current operation working condition and load of the engineering machinery from a noise sample library, and playing the noise sample so as to achieve the purpose of active noise reduction.
Further, the preset noise samples are obtained by the following method: collecting noise signals of each appointed noise source and the sound insulation quantity of the cab to each appointed noise source when the engineering machinery is under different working conditions and loads; and when the engineering machinery is under different working conditions and loads, subtracting the sound insulation quantity of the cab to each appointed noise source from the anti-phase signal of the noise signal of each appointed noise source, multiplying the sound insulation quantity by a set proportion, fitting the sound insulation quantity to be used as a preset noise sample capable of canceling the noise beside the ear of the driver, and synthesizing a filter signal for storage.
Further, when collecting engineering machinery under different working conditions and loads, the noise signal of the appointed noise source comprises: collecting noise signals of an engine and a main pump at a set plurality of different rotating speeds and loads; collecting noise signals of the fan and the air conditioning system at a set plurality of different gears or rotating speeds; collecting noise signals of the crawler chassis when the crawler chassis runs along a specified road surface under a plurality of set gears; and collecting noise signals generated when the operation accessory operates in a plurality of set gears.
Further, the step of subtracting the sound insulation amount of the cab to each specified noise source from the anti-phase signal of the noise signal of each specified noise source, multiplying the sound insulation amount by a set ratio, and then fitting the sound insulation amount comprises the steps of: multiplying the anti-phase signals of the noise signals of the engine and the main pump by 70% -100% proportion and then fitting; multiplying the anti-phase signals of noise signals of the fan and the air conditioning system by 90% -100% of the signals, and fitting again; fitting again the inverse phase signal of the noise signal of the crawler chassis in a ratio of multiplying by 70% -100%; and (4) re-fitting the anti-phase signal of the noise signal of the operation accessory in a ratio of multiplying by 50% -90%.
Further, the method further comprises the following steps: when the load difference between the current operation working condition and load of the engineering machine and the preset working condition in the preset noise sample exceeds a set first threshold value, stopping playing the preset noise sample for preventing noise from being aggravated.
Further, the method further comprises the following steps: when the current operation working condition and load of the engineering machine and the load difference of the preset working condition in the preset noise sample are smaller than a set second threshold value, the play volume of the preset noise sample is reduced according to a set proportion, and the noise reduction effect is improved.
Further, the method further comprises the following steps: an acoustic microphone is arranged at a position close to the ear of a driver and is used for monitoring noise signals beside the ear of the driver in real time and taking the noise signals as response input so as to automatically correct the active noise reduction effect.
In a second aspect, an active noise reduction system for a construction machine is provided, including: the data acquisition module is used for acquiring the operation parameters of the engineering machinery and judging the current operation working condition and load of the engineering machinery according to the operation parameters; the noise reduction module is used for calling a preset noise sample matched with the current operation working condition and load of the engineering machinery from the noise sample library and playing the noise sample so as to achieve the purpose of active noise reduction.
Further, the system also comprises a first correction module, which is used for stopping playing the preset noise sample when the difference between the current operation working condition and load of the engineering machine and the preset working condition load in the preset noise sample is greater than or equal to a set first threshold value, so as to prevent noise from being aggravated; and the second correction module is used for reducing the play volume of the preset noise sample according to the set proportion when the current operation working condition and load of the engineering machine and the load difference of the preset working condition in the preset noise sample are smaller than a set second threshold value, and improving the noise reduction effect.
Further, the system also comprises a third correction module for monitoring noise signals beside the ears of the driver in real time through an acoustic microphone arranged near the ears of the driver, and taking the noise signals as response input so as to automatically correct the active noise reduction effect.
In a third aspect, a construction machine is provided, which is configured with the construction machine active noise reduction system according to the second aspect.
Compared with the prior art, the invention has the beneficial effects that: the invention acquires the operation parameters of the engineering machinery and judges the current operation condition and load of the engineering machinery according to the operation parameters; invoking a preset noise sample matched with the current operation working condition and load of the engineering machinery from a noise sample library, and playing the noise sample so as to achieve the purpose of active noise reduction; the invention has the advantages of good transient response, good noise reduction effect, quick algorithm iteration and the like, greatly reduces the calculation performance requirement on the controller, and simultaneously reduces the volume and the cost of a hardware system.
Drawings
FIG. 1 is an off-board noise source and path for a certain type of work machine;
FIG. 2 is a schematic diagram of an ANC active noise reduction control in the automotive industry;
FIG. 3 is a schematic diagram of an active noise reduction system for an engineering machine according to an embodiment of the present invention;
Fig. 4 is a schematic flow chart of an active noise reduction method of an engineering machine in an embodiment of the invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present invention, and are not intended to limit the scope of the present invention.
Embodiment one:
As shown in fig. 1 to 4, an active noise reduction method for engineering machinery includes: collecting operation parameters of the engineering machinery, and judging the current operation working condition and load of the engineering machinery according to the operation parameters; and calling a preset noise sample matched with the current operation working condition and load of the engineering machinery from a noise sample library, and playing the noise sample so as to achieve the purpose of active noise reduction.
The invention adopts a control strategy of combining a 'preset noise sample' with the real-time correction of the noise signal, thereby greatly reducing the calculation performance requirement of the controller chip.
As shown in fig. 1, is an off-board noise source and path for a certain type of work machine. The noise frequency and the amplitude of the main sound source of the engineering machinery under all working conditions are collected in advance by analyzing the noise cause and the noise path, and the noise frequency and the amplitude comprise, but are not limited to, an engine, a fan, a main pump and the like.
The preset noise sample is obtained by the following method:
(1) And collecting noise signals of the appointed noise source when the engineering machinery is under different working conditions and loads.
An off-board noise source and path summary for a particular work machine is shown in table 1.
TABLE 1 noise source and path outside of a certain engineering machine
For the engine and the main pump, after the gear is selected and the rotation speed is stable, the noise frequency of the engine and the main pump is basically unchanged, but the noise amplitude changes in real time along with the change of the load. Therefore, noise signals under the working conditions of 20%, 40%, 60%, 80% and 100% are collected, and noise signals with opposite phases and basically same amplitude (90-100%) are calculated and used as one of the noise signals to be eliminated.
For the fan and the air conditioning system, after the gear is selected and the rotating speed is stable, the noise frequency and the amplitude of the noise of the fan and the air conditioning system are basically fixed, and a cancellation noise signal with opposite phases and about x% of the amplitude is sent out to be used as one of noise signals to be cancelled.
The frequency and amplitude of the noise signal of the working device, the main valve, the turntable and other systems are changed in real time, and the repeatability is poor, so the noise signal is not used as one of noise signals to be eliminated.
For the crawler chassis, after the gear is selected and the rotating speed is stable, the noise of the crawler chassis is strongly related to the road surface (the clay road surface and the cement road surface), but the main noise frequency of the crawler chassis is consistent, so that the clay road surface noise signals with relatively small noise are collected, and the noise signals with opposite phases and same amplitude are calculated and used as one of the noise signals to be eliminated.
(2) And when the engineering machinery is under different working conditions and loads, subtracting the sound insulation quantity of the cab to each appointed noise source from the anti-phase signal of the noise signal of each appointed noise source, multiplying the sound insulation quantity by a set proportion, fitting the sound insulation quantity to be used as a preset noise sample capable of canceling the noise beside the driver ear, synthesizing a filter signal, and storing the filter signal in the controller.
The invention fits the algorithm of the noise beside the driver's ear according to the four main noise sources of the engine noise, the fan noise, the exhaust noise and the intake noise. Based on the load of four noise sources of an engine, a fan, air inlet and exhaust and the transfer function from a sound source to a noise measuring point beside a driver's ear, a correlation prediction model between the noise beside the driver's ear and a main noise source is established, and the calculation model is as follows:
Where L f0 is the sound power level of the driver's ear noise in the 1/3 times frequency band of f, L f Engine with a motor is the sound power level of the engine in the 1/3 times frequency band of f, X f Engine with a motor is the average sound pressure level difference of the cab to the engine sound insulation in the 1/3 times frequency band of f, L f Fan with fan body is the sound power level of the fan in the 1/3 times frequency band of f, X f Fan with fan body is the average sound pressure level difference of the cab to the fan sound insulation in the 1/3 times frequency band of f, L f Exhaust gas is the average sound pressure level of the cab to the exhaust sound insulation in the 1/3 times frequency band of f, X f Exhaust gas is the average sound pressure level difference of the air intake air in the 1/3 times frequency band of f, and X f Air intake is the average sound pressure level difference of the air intake air insulation in the 1/3 times frequency band of f.
Collecting noise signals of a designated noise source when engineering machinery is under different working conditions and loads, including: collecting noise signals of an engine and a main pump at a set plurality of different rotating speeds and loads; collecting noise signals of the fan and the air conditioning system at a set plurality of different gears or rotating speeds; collecting noise signals of the crawler chassis when the crawler chassis runs along a specified road surface under a plurality of set gears; and collecting noise signals generated when the operation accessory operates in a plurality of set gears.
The method for fitting the noise signals of the specified noise sources after subtracting the sound insulation amount of the cab to the specified noise sources from the anti-phase signals of the noise signals of the specified noise sources and multiplying the anti-phase signals by the set proportion comprises the following steps: multiplying the anti-phase signals of the noise signals of the engine and the main pump by 70% -100% proportion and then fitting; multiplying the anti-phase signals of noise signals of the fan and the air conditioning system by 90% -100% of the signals, and fitting again; fitting again the inverse phase signal of the noise signal of the crawler chassis in a ratio of multiplying by 70% -100%; and (4) re-fitting the anti-phase signal of the noise signal of the operation accessory in a ratio of multiplying by 50% -90%.
During actual running, an engine CAN signal (directly obtaining the engine rotating speed, obtaining the fan rotating speed according to the speed ratio calculation), a crank angle signal, a main pump pressure pulse signal (main pump rotating speed and load), an electric signal of a handle rabbit gear/tortoise gear and the like are monitored in real time, the running working condition and load of the engineering machinery are judged in real time, and then a preset noise sample under the working condition load is called and played through a radio, so that the purpose of actively reducing noise is achieved.
When the control strategy of the 'preset noise sample' is adopted, sensor signals such as engine CAN signals and the like are synthesized, and the fact that the difference between the actual working condition load and the preset working condition load is overlarge (the difference of the rotating speed signals and the like is not less than y percent, namely, when the current operating condition of the engineering machinery and the difference between the load and the preset working condition load in the preset noise sample exceed a set first threshold value) is judged, the active noise reduction system stops working, and noise aggravation is avoided. If the difference between the actual working condition load and the preset working condition load is reasonable (the difference of the rotating speed signal and the like is less than a percent, namely, the difference between the current operating condition and the load of the engineering machinery and the preset working condition load in the preset noise sample is less than a set second threshold value), the volume z of the preset noise sample played by the radio is reduced in proportion, and the noise reduction effect can be properly improved.
The control strategy of the 'preset noise sample' is adopted, a group of acoustic microphones are arranged at the position close to the ears of a driver (such as the position of a seat headrest close to the ears of a person), the noise signal beside the ears of the driver is monitored in real time, and the noise signal is used as a response input, so that the active noise reduction effect of the self-correcting system is achieved.
The invention also provides an engineering machinery active noise reduction system applying the active noise reduction control method, which comprises a microphone, a controller chip, a radio, a circuit and the like. The controller chip adopts the existing controller chip, integrates the existing radio on the vehicle and adds 1-2 new radios, and the noise reduction part circuit is integrated with the existing instrument circuit, so that the cost and the use space are greatly reduced.
By installing and debugging the technical scheme of the invention in the cab of part of engineering machinery, the full-band noise beside the cab driver's ear can be reduced by more than 3dB (A) under the stable working condition, and the actual hearing is obvious. When the rotating speed is switched, the transient response of the active noise reduction system is good, and the noise reduction signals can be changed in real time quickly according to the use conditions.
Different from the traditional active noise reduction system which adopts a control strategy of real-time calculation and noise reduction according to the change of the following noise signals, the active noise reduction control algorithm of the engineering machinery can greatly reduce the calculation performance requirement on a controller chip, improve the noise reduction effect and improve the stability of the active noise reduction effect.
The method has the advantages of good transient response, good noise reduction effect, quick algorithm iteration update and the like, and is very suitable for engineering machinery.
Different from an active noise reduction system of an automobile, the noise source signal eliminating device is suitable for engineering machinery and can eliminate noise source signals of various engineering machinery such as an engine, a fan, a main pump and the like under all working conditions.
The invention can be integrated with the existing hardware, realizes miniaturization and low cost of the hardware system, and greatly reduces the use cost and the cab space.
Embodiment two:
Based on the method for actively reducing noise of the engineering machinery in the first embodiment, the embodiment provides an active noise reduction system of the engineering machinery, including:
The data acquisition module is used for acquiring the operation parameters of the engineering machinery and judging the current operation working condition and load of the engineering machinery according to the operation parameters;
The noise reduction module is used for calling a preset noise sample matched with the current operation working condition and load of the engineering machinery from the noise sample library and playing the noise sample so as to achieve the purpose of active noise reduction.
The first correction module is used for stopping playing the preset noise sample when the load difference between the current operation working condition and load of the engineering machine and the preset working condition in the preset noise sample exceeds a set first threshold value, and is used for preventing noise from being aggravated.
And the second correction module is used for reducing the play volume of the preset noise sample according to the set proportion when the current operation working condition and load of the engineering machine and the load difference of the preset working condition in the preset noise sample are smaller than a set second threshold value, and improving the noise reduction effect.
And the third correction module is used for monitoring noise signals beside the ears of the driver in real time through an acoustic microphone arranged at a position close to the ears of the driver, and taking the noise signals as response input so as to automatically correct the active noise reduction effect.
Embodiment III:
based on the first active noise reduction method of the engineering machine and the second active noise reduction system of the engineering machine, the present embodiment provides an engineering machine, and the engineering machine is configured with the second active noise reduction system of the engineering machine.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the present invention, and such modifications and variations should also be regarded as being within the scope of the invention.

Claims (11)

1. An active noise reduction method for engineering machinery is characterized by comprising the following steps:
collecting operation parameters of the engineering machinery, and judging the current operation working condition and load of the engineering machinery according to the operation parameters;
and calling a preset noise sample matched with the current operation working condition and load of the engineering machinery from a noise sample library, and playing the noise sample so as to achieve the purpose of active noise reduction.
2. The method of active noise reduction of a construction machine according to claim 1, wherein the predetermined noise samples are obtained by:
Collecting noise signals of each appointed noise source and the sound insulation quantity of the cab to each appointed noise source when the engineering machinery is under different working conditions and loads;
And when the engineering machinery is under different working conditions and loads, subtracting the sound insulation quantity of the cab to each appointed noise source from the anti-phase signal of the noise signal of each appointed noise source, multiplying the sound insulation quantity by a set proportion, fitting the sound insulation quantity to be used as a preset noise sample capable of canceling the noise beside the ear of the driver, and synthesizing a filter signal for storage.
3. The method for actively reducing noise of a construction machine according to claim 2, wherein collecting noise signals of a specified noise source of the construction machine under different working conditions and loads comprises:
collecting noise signals of an engine and a main pump at a set plurality of different rotating speeds and loads;
Collecting noise signals of the fan and the air conditioning system at a set plurality of different gears or rotating speeds;
Collecting noise signals of the crawler chassis when the crawler chassis runs along a specified road surface under a plurality of set gears;
and collecting noise signals generated when the operation accessory operates in a plurality of set gears.
4. The method according to claim 2, wherein subtracting the sound insulation amount of the cab to each specified noise source from the anti-phase signal of the noise signal of each specified noise source, multiplying the noise signal by a set ratio, and fitting the noise signal, comprises:
multiplying the anti-phase signals of the noise signals of the engine and the main pump by 70% -100% proportion and then fitting;
multiplying the anti-phase signals of noise signals of the fan and the air conditioning system by 90% -100% of the signals, and fitting again;
fitting again the inverse phase signal of the noise signal of the crawler chassis in a ratio of multiplying by 70% -100%; and (4) re-fitting the anti-phase signal of the noise signal of the operation accessory in a ratio of multiplying by 50% -90%.
5. The method of active noise reduction for a construction machine according to claim 1, further comprising: when the load difference between the current operation working condition and load of the engineering machine and the preset working condition in the preset noise sample exceeds a set first threshold value, stopping playing the preset noise sample for preventing noise from being aggravated.
6. The method of active noise reduction for a construction machine according to claim 1, further comprising: when the current operation working condition and load of the engineering machine and the load difference of the preset working condition in the preset noise sample are smaller than a set second threshold value, the play volume of the preset noise sample is reduced according to a set proportion, and the noise reduction effect is improved.
7. The method of active noise reduction for a construction machine according to claim 1, further comprising: an acoustic microphone is arranged at a position close to the ear of a driver and is used for monitoring noise signals beside the ear of the driver in real time and taking the noise signals as response input so as to automatically correct the active noise reduction effect.
8. An active noise reduction system for an engineering machine, comprising:
The data acquisition module is used for acquiring the operation parameters of the engineering machinery and judging the current operation working condition and load of the engineering machinery according to the operation parameters;
The noise reduction module is used for calling a preset noise sample matched with the current operation working condition and load of the engineering machinery from the noise sample library and playing the noise sample so as to achieve the purpose of active noise reduction.
9. The active noise reduction system of the engineering machine according to claim 8, further comprising a first correction module, configured to stop playing the preset noise sample when a difference between a current operation condition and a load of the engineering machine and a preset condition load in the preset noise sample is greater than or equal to a set first threshold, for preventing noise from being aggravated;
And the second correction module is used for reducing the play volume of the preset noise sample according to the set proportion when the current operation working condition and load of the engineering machine and the load difference of the preset working condition in the preset noise sample are smaller than a set second threshold value, and improving the noise reduction effect.
10. The active noise reduction system of construction machinery according to claim 8, further comprising a third correction module for monitoring noise signals near the driver's ears in real time by means of an acoustic microphone mounted near the driver's ears and inputting the noise signals in response to automatically correct the active noise reduction effect.
11. An engineering machine, characterized in that the engineering machine is provided with the active noise reduction system of the engineering machine according to any one of claims 8-10.
CN202410639697.0A 2024-05-22 2024-05-22 Active noise reduction method and system for engineering machinery and engineering machinery Pending CN118230711A (en)

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