CN116229930A - Active noise reduction method and system for excavator and excavator - Google Patents

Active noise reduction method and system for excavator and excavator Download PDF

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Publication number
CN116229930A
CN116229930A CN202211624990.7A CN202211624990A CN116229930A CN 116229930 A CN116229930 A CN 116229930A CN 202211624990 A CN202211624990 A CN 202211624990A CN 116229930 A CN116229930 A CN 116229930A
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noise
signal
excavator
signals
noise reduction
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刘彬
崔凯
陈秀梅
孙仁福
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Weichai Power Co Ltd
Linde Hydraulics China Co Ltd
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Weichai Power Co Ltd
Linde Hydraulics China Co Ltd
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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
    • 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
    • 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
    • G10K2210/121—Rotating machines, e.g. engines, turbines, motors; Periodic or quasi-periodic signals in general
    • 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
    • G10K2210/3025—Determination of spectrum characteristics, e.g. FFT
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation

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  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
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Abstract

The invention discloses an active noise reduction method and system for an excavator and the excavator, wherein a first noise spectrum signal obtained by converting a pressure signal of high-pressure oil of a hydraulic pump of the excavator is obtained; a second noise spectrum signal converted from the engine injector control current signal; a third noise spectrum signal obtained by converting the rotation speed of the cooling fan; the controller obtains a first control signal according to the first noise spectrum signal, obtains a second control signal according to the second noise spectrum signal, obtains a third control signal according to the third noise spectrum signal, and respectively controls the output of the corresponding suppression loudspeaker through three independent control signals. The noise source signal acquisition and inhibition processing processes are mutually independent and do not affect each other; no signal phase delay and good noise reduction effect.

Description

Active noise reduction method and system for excavator and excavator
Technical Field
The invention belongs to the field of noise reduction of excavators, and particularly relates to an active noise reduction method and system for an excavator and the excavator.
Background
At present, the excavator occupies a significant position in the engineering machinery industry, and the requirements of drivers on operation comfort are higher and higher, wherein the noise pollution of a cab brings strong uncomfortable feeling to people, the operation experience is directly influenced, the noise of the cab mainly comes from a hydraulic power system and the environment, the sound frequency of the environmental noise is irregular, the noise of the hydraulic power system mainly comes from an engine or a motor, a hydraulic pump, an engine fan, a hydraulic oil fan and the like, and the regularity of the noise frequency is strong; for example, in a conventional mountain rebuilding machine SE600 excavator, as shown in fig. 1, cabin noise is measured and analyzed, and cabin noise is mainly low-frequency noise (within 500 Hz). The noise reduction technology is divided into two types: passive noise reduction (physical noise reduction) and active noise reduction, respectively: the passive noise reduction adopts sound absorption or damping shock absorption to reduce noise, but the traditional physical sound insulation has poorer low-frequency noise treatment effect because the low-frequency noise has longer wavelength and stronger penetrability. Actively reducing noise, collecting the frequency and the size of noise, and performing reverse phase cancellation; the active noise reduction technology is easy to capture the phase of low-frequency noise, has small signal delay and better effect on high-frequency noise.
The internal combustion engine (mainly a diesel engine) and the hydraulic system in the hydraulic power assembly have two characteristics: the decibels are higher, the mutual distance of noise sources is closer, two problems are brought to noise reduction, and the two problems are respectively: 1) Physical noise reduction is limited; 2) Active noise reduction: noise sources are closer in distance, different frequencies and decibel noise are superimposed, so that the waveform of the acquired noise signals is complex, on one hand, the phase is difficult to capture and offset, on the other hand, the complex noise signals are large in processing calculation amount, cannot respond quickly, the output delay of the suppressed sound signals is large, and the noise reduction effect is not obvious. Meanwhile, the noise source is influenced by environmental noise and other noise sources, the noise source is directly interfered by the noise signal collectors such as microphones and the like, the noise source is complex in sound signal, great difficulty is brought to frequency division processing of the noise source, the output inhibition signal is high in time delay, and the noise reduction effect is not obvious.
Disclosure of Invention
The invention provides an active noise reduction method and system for an excavator and the excavator, which are used for solving the problem that the current hydraulic power assembly noise source signal is difficult to collect.
In order to achieve the above object, the present invention is realized by the following technical scheme:
in a first aspect, the present invention provides an active noise reduction method for an excavator, as follows:
acquiring a first noise spectrum signal obtained by converting a pressure signal of high-pressure oil of a hydraulic pump of the excavator;
acquiring a second noise spectrum signal obtained by converting a control current signal of an engine oil injector;
acquiring a third noise spectrum signal obtained by converting the rotating speed of a hydraulic oil radiator fan and the rotating speed of an engine oil radiator fan;
the first control signal is obtained according to the first noise spectrum signal, the second control signal is obtained according to the second noise spectrum signal, the third control signal is obtained according to the third noise spectrum signal, and the output of the corresponding suppression loudspeaker is respectively controlled through three independent control signals.
As a further technical scheme, the noise signals of the cab are collected through the error sensor and fed back to the controller, and the controller sends out control signals according to the feedback signals and the first noise spectrum signals, the second noise spectrum signals and the third noise spectrum signals.
As a further technical scheme, the noise signal of the excavator hydraulic pump is obtained through the piezoelectric ceramic sensor.
In a second aspect, the invention also provides an active noise reduction system of the excavator, which comprises a piezoelectric ceramic sensor, a rotating speed sensor, a current sensor and a controller;
the piezoelectric ceramic sensor collects pressure signals of high-pressure oil of the hydraulic pump of the excavator and converts the pressure signals into electric signals to obtain corresponding first noise spectrum signals;
the current sensor acquires a control current signal of an engine fuel injector to obtain a corresponding second noise spectrum signal;
the rotating speed sensor acquires the rotating speed of a hydraulic oil radiator fan and the rotating speed of an engine oil radiator fan to obtain a corresponding third noise spectrum signal;
the controller outputs a first control signal according to the first noise spectrum signal, a second control signal according to the second noise spectrum signal, and a third control signal according to the third noise spectrum signal, and the controller controls the output of the corresponding suppression loudspeaker respectively through three independent control signals.
As a further technical scheme, the intelligent control system further comprises an error sensor, noise signals of the cab are collected through the error sensor and fed back to the controller, and the controller sends out control signals according to the feedback signals, the first noise spectrum signals, the second noise spectrum signals and the third noise spectrum signals.
As a further technical solution, one control signal may correspond to a plurality of suppression speakers.
As a further technical scheme, the loudspeaker further comprises a signal amplifier, wherein the signal amplifier amplifies three paths of control signals and sends the amplified three paths of control signals to the inhibition loudspeaker.
In a third aspect, the present invention also provides an excavator, on which the active noise reduction system described above is mounted.
In a fourth aspect, the present invention also provides an excavator, which uses the active noise reduction method to reduce noise.
The beneficial effects of the embodiment of the invention are as follows:
according to the invention, corresponding signals are obtained from a noise source and are all converted into pure spectrum signals, specifically, corresponding pure spectrum signals are obtained by obtaining pressure signals of high-pressure oil of a hydraulic pump of an excavator, control current signals of an engine oil sprayer, the rotating speed of a fan of a hydraulic oil radiator and the rotating speed of a fan of an engine oil radiator; according to the signals, the corresponding suppression speakers are controlled, the whole noise source signal acquisition and suppression processing processes are mutually independent and do not affect each other, the noise signal processing method is simple in corresponding function, high in response speed, free of signal phase delay and good in noise reduction effect, and the defects of mutual interference in traditional noise reduction sound acquisition, large in noise frequency division calculation amount and suppression signal phase delay are avoided.
The invention has simple hardware structure and can indirectly collect ideal noise source signals; specifically, the piezoelectric ceramic sensor is used for indirectly collecting the noise source of the pure hydraulic system, the piezoelectric ceramic sensor is used for replacing the traditional microphone to collect the noise of the pump cabin, the interference of other noise sources is eliminated, and the accurate collection of the noise source is realized; the relation between the measurement of the engine noise and the control electric signal of the oil injector is measured, and the oil injector control current signal is indirectly utilized to reflect the engine noise; the rotating speed signal is indirectly utilized to reflect the noise of the oil radiator through measuring and calibrating the rotating speed and the noise of the oil radiator; the actual noise is collected, divided and analyzed through the cab error sensor, and the calculation functions of the noise suppression signals of the hydraulic pump, the engine and the oil radiator are timely adjusted by utilizing an optimizing algorithm, so that the cab noise is reduced to the maximum extent.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.
FIG. 1 is a schematic diagram of a SE600 cab noise spectrum in the prior art;
FIG. 2 is a schematic diagram of a piezoceramic sensor in accordance with the present invention;
FIG. 3 is a schematic diagram of a piezoceramic sensor in accordance with the present invention;
FIG. 4 is a schematic diagram of a conventional feedback system;
FIG. 5 is a schematic diagram of a conventional noise reduction system function transfer;
FIG. 6 is a schematic diagram of the feedback system of the present invention;
FIG. 7 is a schematic diagram of an active noise reduction feedback system of the present invention;
FIG. 8 is a schematic diagram of excavator cab hardware distribution;
in the figure: 1-a wire column; 2-a nut; 3-valve sleeve; 4-a pump flow distribution end cover of the excavator; a 5-metal substrate; 6-piezoelectric ceramics; 7-a sealing ring; 8-signal lines; 9-processor, 10-the passageway that links to each other with hydraulic pump high pressure oil mouth, 11 the passageway that is linked together with oil return case or casing.
Detailed Description
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present invention. As used herein, the singular forms also are intended to include the plural forms unless the present invention clearly dictates otherwise, and furthermore, it should be understood that when the terms "comprise" and/or "include" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof;
as described in the background art, in the prior art, noise signals are collected through a microphone located in an engine, and then a suppression signal is output from a cab after the noise signals are processed to reduce the noise; the noise source is influenced by environmental noise and other noise sources, the noise source is directly through sound signal collectors such as microphones and the like, the noise source is complicated in sound signal, great difficulty is brought to frequency division processing of the noise source, the delay of the output inhibition signal is high, and the noise reduction effect is not obvious; meanwhile, in the noise reduction process, other problems exist, and in order to solve the technical problems, the invention provides an active noise reduction method and system for an excavator and the excavator.
The embodiment provides an active noise reduction method for an excavator, wherein the noise reduction method comprises a hydraulic power assembly noise signal acquisition method and a data processing method, and the hydraulic power assembly noise signal acquisition method specifically comprises acquisition methods of hydraulic system noise, engine noise, oil radiator noise and the like, and specifically comprises the following steps:
the method for collecting the noise of the hydraulic system is described first, and analysis in the background art shows that the noise of the hydraulic system is regular noise caused by system pressure fluctuation and rotational movement of parts, so that the piezoelectric ceramic sensor is used for collecting the noise of the pump cabin instead of the traditional microphone, interference of other noise sources is eliminated, and accurate collection of the noise sources is achieved. The structure of the piezoelectric sensor for collecting noise signals of the hydraulic pump is shown in fig. 2, and the piezoelectric ceramic sensor is used for collecting noise, wherein the piezoelectric ceramic sensor comprises a wire column 1, a nut 2, a valve sleeve 3, an excavator pump flow distribution end cover 4, a metal substrate 5, piezoelectric ceramics 6, a sealing ring 7, a signal wire 8 and a processor 9 (DSP); the upper inner ring of the valve sleeve 3 is matched with the nut 2, the lower outer ring of the valve sleeve 3 is matched with the excavator pump flow distribution end cover 4, a circle of steps are arranged on the inner side surface of the excavator pump flow distribution end cover 4, a metal substrate 5 is fixed on the steps, the metal substrate 5 is parallel to the bottom surface of the excavator pump flow distribution end cover 4, a channel 10 connected with a high-pressure oil port of a hydraulic pump is arranged on the bottom surface of the excavator pump flow distribution end cover 4, and a channel 11 communicated with an oil return box or a shell is arranged on the side surface of the excavator pump flow distribution end cover 4; the metal substrate 5 is connected to the stud 1 by a wire, and the stud 1 is connected to the processor 9 by a signal line 8. A piezoelectric ceramic sheet 6 is adhered to the bottom surface of the metal substrate 5, and the middle is fixed by conductive adhesive.
As shown in fig. 3, in the principle of the piezoelectric ceramic sensor, a piezoelectric ceramic sheet 6 is adhered to the surface of a circular metal substrate, the middle is fixed by conductive adhesive, and the piezoelectric ceramic is bent and deformed under the action of pressure to generate two electric signals with opposite upper and lower directions; therefore, when the hydraulic oil on the surface of the piezoelectric ceramic is applied to alternate up and down under the action of the pump, a periodic sine signal can be generated; in fig. 3, the round metal substrate can select materials such as stainless steel, bronze, red copper and the like according to the extreme pressure of the pump, and the pressure bearing capacity of the three materials is respectively that stainless steel is equal to or larger than bronze is equal to or larger than red copper, and can be selected according to the pressure of the system.
Specifically, as shown in fig. 2, the sensor introduces high-pressure oil to be measured into the sensor through a channel 10 connected with a high-pressure oil port of the hydraulic pump, so that the piezoelectric vibrator deforms under the action of the pressure of hydraulic oil and is converted into an electric signal to the processor; under the condition of constant pressure, the ideal sine wave signal output by the piezoelectric ceramic is as follows:
V(t)＝A s i n((2πft)＝A s i n((2πNn*t/60)
wherein A is that the nominal amplitude is related to the pressure; n is the number of hydraulic pump plungers or the number of vane pump impellers or the number of gear pump teeth; n is the pump speed (r/min).
However, since any signal source has various components of interference and different noise, each noise component is different, so that the actually obtained signal is:
V(t)＝A p(t)s i n[2iπNn*t/60+j(t)]
wherein, p (t) is instantaneous pressure and can be converted into piezoelectric ceramic current I (t); i can be understood as the first and second order frequencies of sound, j (t) being the phase noise in the actual signal. The electric signal output by the final piezoelectric ceramic is V 1 (t),V 2 (t),V 3 (t),V 4 (t)…V i (t) the waveform is:
V i (t)＝A*I piezoelectric device (t)*s i n[2iπNn*t/60+j(t)]
And (3) calibrating the relation between the electrical signal and the sound pressure of the piezoelectric sensor, gradually pressurizing the hydraulic pump at the rated rotating speed, collecting the sound pressure frequency and the sound pressure of the previous I bits (shown in table 1), and fitting the relation between I (t) and the sound pressure by using Mat/ab to accurately obtain the accurate frequency spectrum of sound and piezoelectric current.
Table 1 piezoelectric ceramic and sound pressure calibration meter
Figure BDA0004003840570000071
The following describes the engine noise source collection and processing mode of the excavator:
diesel engines (engines) are currently the main source of excavator power and also the main source of excavator noise, wherein the main sources are exhaust noise and post-combustion noise, the exhaust noise and the combustion noise are periodic, and the standard frequency f (Hz) can be expressed as:
f(Hz)＝i*(N*n)/60τ
wherein: n is the number of cylinders; n is the engine speed (r/mi n); τ is the engine stroke, 4-stroke τ=2, 2-stroke τ=1; i is the harmonic number, 1,2,3 …, i=1 is the fundamental frequency of exhaust combustion.
The exhaust noise and the combustion noise are related to the combustion explosion pressure of the engine, the explosion pressure of the engine is related to the oil injection quantity of the oil nozzle, and the oil injection quantity is controlled by an ECU signal of the engine, so the engine size and the frequency can be obtained from the ECU signal of the engine. Therefore, the relationship between the engine ECU electrical signal and the sound pressure can be calculated as D 1 (t),D 2 (t),D 3 (t),D 4 (t)…D i (t) the waveform is:
D i (t)＝B*I ECU (t)*s i n[2πi*(N*n)/60τ+j(t)]
wherein I is ECU And (t) the electric signal for controlling the oil injection quantity of the oil injector requires a laboratory to calibrate sound pressure data according to the table 2, and data fitting is performed by using Mat l ab.
Table 2 oil atomizer control current and sound pressure calibration
Figure BDA0004003840570000081
The following method for collecting noise of an oil radiator (hydraulic oil radiator and engine oil radiator) according to the present embodiment is described as follows:
the noise analysis spectrum analysis of hydraulic oil radiator and engine oil radiator, the rotation noise of fan is the noise caused by the periodic striking air particle of the rotation of blade, causes the pressure pulsation of surface, and this periodic pressure pulsation is formed by superposition of a steady fundamental frequency and a series of harmonic components, its frequency f (Hz) can be expressed as:
f(Hz)＝i*(z*n)/60
wherein: n is the fan speed (r/mi n); z is the number of blades; i is the harmonic number, 1,2,3 …, i=1 is the fundamental frequency of the fan. Wherein the rotational speed n can be acquired by a rotational speed sensor. The relationship between the fan speed and the sound pressure can be calculated as F 1 (t),F 2 (t),F 3 (t),F 4 (t)…F i (t) the waveform is:
F i (t)＝C*n(t)*s i n[2πi*(z*n)/60+j(t)]
wherein n (t) and sound pressure are calibrated, and the laboratory is required to calibrate data according to the table 3, and data fitting is performed by using Mat l ab.
Fig. 3 fan speed and sound pressure calibration meter
Figure BDA0004003840570000091
Through the three methods, data are fitted by utilizing MATLAB, so that noise spectrum signals indirectly purified by noise and piezoelectric current, ECU oil sprayer control current and radiator fan rotating speed can be obtained, the defects of mutual interference of traditional noise reduction sound collection, large noise frequency division calculated amount and suppression signal phase delay are avoided, a more convenient processing method is brought to correction of subsequent suppression signals, after the three noise spectrum signals are obtained, a controller outputs a first control signal according to the noise spectrum signals corresponding to the piezoelectric current, a second control signal according to the noise spectrum signals corresponding to the ECU oil sprayer control current and a third control signal according to the noise spectrum signals corresponding to the radiator fan rotating speed, and the output of the respective suppression speakers is respectively controlled through three independent control signals; the noise reduction sound which is transmitted by the controller and is opposite to the equivalent noise in phase and same in amplitude is restrained from being received and emitted by the loudspeaker, and active noise reduction is realized.
Another aspect of the present embodiment provides a multi-source active noise reduction system, which is suitable for an active noise reduction processing method of any of a plurality of parameter-dependent noise sources other than a hydraulic power assembly, where parameter-dependent refers to that a certain noise source has a correlation with a certain parameter of a body, and frequency spectrum can be indirectly calculated as an input of a noise signal by collecting and calibrating a body parameter of the noise source;
traditional feedback ANC noise reduction system principle: the method comprises DSP signal processing, signal output inhibition, error signal acquisition and noise reduction effect monitoring analysis, reference signal calculation and filter weight updating, as shown in fig. 4, and function transfer of signals in a feedback system is shown in fig. 5.
In fig. 5, P (m) is the reference microphone and error microphone transfer function; i (m): a filter transfer function; k (m) is a secondary path/drive circuit transfer function; h (m): noise source and reference microphone transfer functions.
The noise reduction system of the invention cancels the reference microphone because the input is N paths of pure signals, and the principle is as shown in figure 6: the three-way noise spectrum signal collected above (corresponding to D in fig. 6 i (t)、F i (t)、V i (t)) is input to the DSP controller, the DSP controller outputs control signals to the secondary path power amplifier according to the collected three paths of noise signals, and the secondary path power amplifier amplifies the control signals and outputs three paths of independent control signals to three corresponding suppression speakers (corresponding to C in figure 6) D (n)、C F (n)、C V (n)); and meanwhile, noise signals are acquired through an error sensor arranged in the cab, the acquired signals are fed back to the DSP controller again, and the DSP controller outputs corresponding control signals according to the feedback signals. The corresponding noise reduction system transfer function is shown in FIG. 7; compared with the traditional active noise reduction method, the active noise reduction method provided by the invention has the advantages that the hardware structure is simple, all paths of noise sources are controlled independently, the noise sources are not affected, and the corresponding speed is high, as can be seen from a schematic diagram and a control function.
The embodiment also provides an excavator, which comprises the active noise reduction system and the active noise reduction method, and the excavator can carry out noise reduction treatment on the noise of the hydraulic pump and the engine, namely the noise of the oil radiator due to the existence of the active noise reduction system, so that the annoyance caused by the noise of the cab is reduced, the quality of the acoustic environment of the cab is further improved, the system is simple, and the acoustic quality processor can be integrated with the ECU of the engine, and has the advantages of simple structure, low cost and good effect. As shown in fig. 8, the cockpit active noise reduction hardware layout has two features: left and right ears of the error sensor are 1 respectively; the suppression speaker may be provided with a plurality of suppression speakers according to actual debugging requirements.
The invention has simple hardware structure and can indirectly collect ideal noise source signals; the noise source signal acquisition and inhibition processing processes are mutually independent and do not affect each other; the noise signal processing function is simple, and the response speed is high; no signal phase delay and good noise reduction effect.
According to the invention, a pure hydraulic system noise source is indirectly collected through the piezoelectric ceramic sensor;
according to the invention, through measuring the relation of engine noise and ECU electrical signals, the ECU fuel injection electrical signals are indirectly utilized to reflect the engine noise;
according to the invention, through measuring and calibrating the rotating speed n and the noise of the oil radiator, the rotating speed sensor signal is indirectly utilized to reflect the noise of the oil radiator;
the invention collects, frequency divides and analyzes the actual noise through the cab error sensor, and utilizes an optimizing algorithm to timely adjust the operation functions of the noise suppression signals of the hydraulic pump, the engine and the oil radiator so as to maximally reduce the cab noise.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. An active noise reduction method for an excavator is characterized by comprising the following steps:
acquiring a first noise spectrum signal obtained by converting a pressure signal of high-pressure oil of a hydraulic pump of the excavator;
acquiring a second noise spectrum signal obtained by converting a control current signal of an engine oil injector;
acquiring a third noise spectrum signal obtained by converting the rotating speed of a hydraulic oil radiator fan and the rotating speed of an engine oil radiator fan;
the first control signal is output according to the first noise spectrum signal, the second control signal is output according to the second noise spectrum signal, the third control signal is output according to the third noise spectrum signal, and the output of the corresponding suppression loudspeaker is respectively controlled through three independent control signals.
2. The method for actively reducing noise of an excavator according to claim 1, wherein the noise signal of the cab is collected by the error sensor to obtain a feedback signal, and the corresponding control signal is adjusted according to the feedback signal and the first, second and third noise spectrum signals.
3. The active noise reduction method of an excavator according to claim 1, wherein the noise signal of the hydraulic pump of the excavator is obtained by a piezoelectric ceramic sensor.
4. The method of active noise reduction for an excavator according to claim 1, wherein the three control signals are amplified and then sent to the corresponding suppressing speakers.
5. An excavator, characterized in that the active noise reduction method of the excavator is adopted for noise reduction.
6. An active noise reduction system of an excavator is characterized by comprising a piezoelectric ceramic sensor, a rotating speed sensor, a current sensor and a controller;
the piezoelectric ceramic sensor collects pressure signals of high-pressure oil of the hydraulic pump of the excavator and converts the pressure signals into electric signals to obtain corresponding first noise spectrum signals;
the current sensor acquires a control current signal of an engine fuel injector to obtain a corresponding second noise spectrum signal;
the rotating speed sensor acquires the rotating speed of a hydraulic oil radiator fan and the rotating speed of an engine oil radiator fan to obtain a corresponding third noise spectrum signal;
the controller outputs a first control signal according to the first noise spectrum signal, a second control signal according to the second noise spectrum signal, and a third control signal according to the third noise spectrum signal, and the controller controls the output of the corresponding suppression loudspeaker respectively through three independent control signals.
7. The active noise reduction system of an excavator of claim 6 further comprising an error sensor, wherein the error sensor is used to collect noise signals from the cab and feed them back to the controller, and the controller is used to send control signals based on the feedback signals and the first, second and third noise spectrum signals.
8. The active noise reduction system of an excavator of claim 6 wherein one control signal corresponds to a plurality of suppression speakers.
9. The active noise reduction system of an excavator of claim 6 further comprising a signal amplifier, wherein the signal amplifier amplifies the three control signals and sends the amplified control signals to the suppression speaker.
10. An excavator, characterized in that the active noise reduction system of the excavator according to any one of claims 6-9 is used for noise reduction.
CN202211624990.7A 2022-12-16 2022-12-16 Active noise reduction method and system for excavator and excavator Pending CN116229930A (en)

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