CN116852165B - Noise suppression method, device, equipment and medium for main transmission system of machining center - Google Patents
Noise suppression method, device, equipment and medium for main transmission system of machining center Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
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Abstract
The application provides a processing center main transmission system noise suppression method, a device, equipment and a medium, relates to the technical field of numerical control processing equipment, and is applied to a processing center, wherein the processing center comprises: the device comprises a machining center main body, a first noise sensor, a second noise sensor, an active noise control module and a sound-proof cover, wherein the first noise sensor is arranged on the machining center main body, and the second noise sensor is arranged on the outer side of the sound-proof cover; the noise suppression method of the main transmission system of the machining center comprises the following steps: collecting a first noise signal in real time through a first noise sensor, and collecting a second noise signal in real time through a second noise sensor; processing the first noise signal to obtain the spectrum characteristic of the first noise signal; controlling the active noise control module to output an inverted signal inverted with the first noise signal according to the frequency spectrum characteristics; and acquiring an error signal between a preset expected signal and a second noise signal, and adjusting an inverted signal according to the error signal.
Description
Technical Field
The application relates to the technical field of numerical control machining equipment, in particular to a method, a device, equipment and a medium for suppressing noise of a main transmission system of a machining center.
Background
The main transmission system is a system for driving the main shaft to move and is responsible for driving the main shaft to drive the cutter and the workpiece to rotate, and the noise produced by the main transmission system of the machining center in the working process is always a technical problem commonly existing in the technical field of numerical control machining equipment and needs to be solved urgently.
In order to reduce the noise caused by the main transmission system of the machining center during operation, the traditional solutions are as follows: a hydraulic system is adopted to replace the traditional mechanical transmission mode; a coupler and a damping device are used in the transmission system.
The two modes are that a certain change is made to the mechanical structure of the machining center, the noise reduction effect is not ideal, and the manufacturing cost of the machining center is increased due to the change of the mechanical structure.
Disclosure of Invention
The main purpose of the application is to provide a method, a device, equipment and a medium for suppressing noise of a main transmission system of a machining center, and aims to solve the technical problems that the existing noise suppression method needs to change the mechanical structure of the machining center and the noise reduction effect is not ideal.
To achieve the above object, the present application provides a machining center main transmission system noise suppression method, which is applied to a machining center, the machining center including: the device comprises a machining center main body, a first noise sensor, a second noise sensor, an active noise control module and a sound-proof cover, wherein the first noise sensor is arranged on the machining center main body, the second noise sensor is arranged on the outer side of the sound-proof cover, and the sound-proof cover is arranged on the outer side of the machining center main body;
the noise suppression method for the main transmission system of the machining center comprises the following steps:
collecting a first noise signal in real time through the first noise sensor, and collecting a second noise signal in real time through the second noise sensor;
processing the first noise signal to obtain the spectrum characteristic of the first noise signal;
controlling the active noise control module to output an inverted signal inverted with the first noise signal according to the frequency spectrum characteristic;
and acquiring an error signal between a preset expected signal and the second noise signal, generating a new phase inversion signal according to the error signal, and outputting the new phase inversion signal to perform noise suppression.
Optionally, in a possible embodiment, the active noise control module includes: an adaptive filter and a vibrator;
the step of controlling the active noise control module to output an inverted signal inverted from the first noise signal according to the spectral characteristics includes:
generating an inverted signal inverted from the first noise signal by the adaptive filter and the spectral feature;
outputting the inverted signal through the vibrator.
Optionally, in a possible embodiment, the adaptive filter comprises a plurality of channels;
the step of generating an inverted signal inverted from the first noise signal by the adaptive filter and the spectral feature, comprises:
determining a corresponding target frequency band of each channel in the frequency spectrum characteristic, wherein the corresponding target frequency bands of each channel are different;
an inverted signal inverted from the first noise signal is generated by each of the channels and each of the target frequency bands.
Optionally, in a possible embodiment, the step of generating a new inverted signal according to the error signal and outputting the new inverted signal includes:
calculating a product of the error signal and the first noise signal;
Updating the weight of the adaptive filter according to the product;
generating a new inverted signal inverted from the first noise signal by the updated adaptive filter and the spectral feature, and outputting the new inverted signal by the vibrator.
Optionally, in a possible embodiment, the processing center includes: a display device;
after the step of generating a new inverted signal from the error signal and outputting, the method further comprises:
when the first noise signal is smaller than a preset decibel threshold value, the active noise control module is closed;
and displaying the signal data of the first noise signal through the display equipment.
Optionally, in a possible embodiment, after the step of generating a new inverted signal from the error signal and outputting, the method further includes:
judging whether the error signal is larger than a preset error threshold value or not;
and if the error signal is larger than the error threshold, displaying prompt information for improving the sound insulation coefficient of the sound insulation cover through the display equipment.
Optionally, in a possible embodiment, after the step of determining whether the error signal is greater than a preset error threshold, the method further includes:
If the error signal is not greater than the error threshold, storing the spectral characteristics, the inverted signal and the sound insulation coefficient of the sound insulation cover in an associated manner;
and if the frequency spectrum characteristic is the same as the stored historical frequency spectrum characteristic, outputting a historical reverse phase signal corresponding to the historical frequency spectrum characteristic through the vibrator, and displaying a historical sound insulation coefficient corresponding to the historical frequency spectrum characteristic through the display equipment.
In addition, in order to achieve the above-mentioned purpose, the present application also provides a machining center main drive system noise suppression device, the machining center main drive system noise suppression device is virtual device, machining center main drive system noise suppression device is applied to the machining center, the machining center includes: the device comprises a machining center main body, a first noise sensor, a second noise sensor, an active noise control module and a sound-proof cover, wherein the first noise sensor is arranged on the machining center main body, the second noise sensor is arranged on the outer side of the sound-proof cover, and the sound-proof cover is arranged on the outer side of the machining center main body;
the machining center main transmission system noise suppression device comprises:
the noise acquisition module is used for acquiring a first noise signal in real time through the first noise sensor and acquiring a second noise signal in real time through the second noise sensor;
The signal processing module is used for processing the first noise signal to obtain the frequency spectrum characteristic of the first noise signal;
the active noise reduction module is used for controlling the active noise control module to output an inversion signal which is inverted with the first noise signal according to the frequency spectrum characteristics;
and the feedback module is used for acquiring an error signal between a preset expected signal and the second noise signal, generating a new reverse signal according to the error signal and outputting the new reverse signal so as to perform noise suppression.
In addition, to achieve the above object, the present application further provides a machining center main drive system noise suppression apparatus including: the system comprises a memory, a processor and a machining center main transmission system noise suppression program which is stored in the memory and can run on the processor, wherein the machining center main transmission system noise suppression program realizes the steps of the method for suppressing the noise of the machining center main transmission system when being executed by the processor.
The present application also provides a computer storage medium having stored thereon a machining center main drive train noise suppression program which when executed by a processor implements the steps of the machining center main drive train noise suppression method described above.
The application provides a processing center main transmission system noise suppression method, a device, equipment and a medium, wherein the processing center main transmission system noise suppression method is applied to a processing center, and the processing center comprises the following steps: the device comprises a machining center main body, a first noise sensor, a second noise sensor, an active noise control module and a sound-proof cover, wherein the first noise sensor is arranged on the machining center main body, the second noise sensor is arranged on the outer side of the sound-proof cover, and the sound-proof cover is arranged on the outer side of the machining center main body; the noise suppression method for the main transmission system of the machining center comprises the following steps: collecting a first noise signal in real time through the first noise sensor, and collecting a second noise signal in real time through the second noise sensor; processing the first noise signal to obtain the spectrum characteristic of the first noise signal; controlling the active noise control module to output an inverted signal inverted with the first noise signal according to the frequency spectrum characteristic; and acquiring an error signal between a preset expected signal and the second noise signal, generating a new phase inversion signal according to the error signal, and outputting the new phase inversion signal to perform noise suppression.
Compared with the technical means for changing the mechanical structure of the machining center in the prior art, the noise suppression method of the main transmission system of the machining center actively reduces noise by installing the noise sensor and the active noise control module on the machining center and installing the sound-proof housing for passive noise reduction, the first noise sensor arranged on the machining center and the second noise sensor arranged on the outer side of the sound-proof housing are used for respectively collecting the original first noise signal and the residual second noise signal after noise reduction of the machining center, the first noise signal is processed and then an inversion signal opposite to the first noise signal is generated for actively reducing noise, then the second noise signal is obtained after the noise reduction of the sound-proof housing is performed, the error signal is obtained by calculating the error signal of the second noise signal and the error signal preset by a user, and a new inversion signal is generated through feedback of the error signal until the error signal is minimum, so that the noise reduction effect can be best.
Therefore, the method for suppressing the noise of the main transmission system of the machining center based on the combination of active noise reduction and passive noise reduction has the advantages that compared with the traditional mode of changing the mechanical structure of the machining center, the method for suppressing the noise of the main transmission system of the machining center actively reduces the noise by generating an opposite-phase signal opposite to the noise, the signal obtained by final noise reduction is used as feedback, the opposite-phase signal is updated and adjusted, meanwhile, a sound-proof cover is arranged on the outer side of the machining center to perform passive noise reduction, and the noise reduction effect is further improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application.
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the description of the embodiments or the prior art will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a schematic diagram of a noise suppression device for a machining center main drive system of a hardware operating environment of the device according to an embodiment of the present application;
FIG. 2 is a schematic flow chart illustrating an embodiment of a method for noise suppression in a main drive system of a machining center according to the present application;
FIG. 3 is a schematic diagram illustrating signal conversion of an embodiment of a method for noise suppression in a machining center main drive system according to the present disclosure;
FIG. 4 is a schematic flow chart illustrating an implementation of an embodiment of a method for noise suppression in a machining center main drive system according to the present application;
fig. 5 is a schematic functional block diagram of a noise suppression device for a main transmission system of a machining center according to an embodiment of the present application.
The realization, functional characteristics and advantages of the present application will be further described with reference to the embodiments, referring to the attached drawings.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
It should be noted that, the machining center is also called a numerically controlled milling machine, and is an automatic machining device, the main transmission system is a system for driving the main shaft to move, and is responsible for driving the main shaft to drive the tool and the workpiece to rotate, and the noise produced by the main transmission system of the machining center in the working process is always a technical problem commonly existing in the technical field of numerically controlled machining devices and to be solved urgently.
In order to reduce the noise caused by the main transmission system of the machining center during operation, the traditional solutions are as follows: a hydraulic system is adopted to replace the traditional mechanical transmission mode; a coupler and a damping device are used in the transmission system.
The two modes are that a certain change is made to the mechanical structure of the machining center, the noise reduction effect is not ideal, and the manufacturing cost of the machining center is increased due to the change of the mechanical structure.
In view of the above problems, the present application provides a method, an apparatus, a device and a medium for suppressing noise of a main transmission system of a machining center, where the method for suppressing noise of the main transmission system of the machining center is applied to the machining center, and the machining center includes: the device comprises a machining center main body, a first noise sensor, a second noise sensor, an active noise control module and a sound-proof cover, wherein the first noise sensor is arranged on the machining center main body, the second noise sensor is arranged on the outer side of the sound-proof cover, and the sound-proof cover is arranged on the outer side of the machining center main body; the noise suppression method for the main transmission system of the machining center comprises the following steps: collecting a first noise signal in real time through the first noise sensor, and collecting a second noise signal in real time through the second noise sensor; processing the first noise signal to obtain the spectrum characteristic of the first noise signal; controlling the active noise control module to output an inverted signal inverted with the first noise signal according to the frequency spectrum characteristic; and acquiring an error signal between a preset expected signal and the second noise signal, generating a new phase inversion signal according to the error signal, and outputting the new phase inversion signal to perform noise suppression.
Compared with the technical means for changing the mechanical structure of the machining center in the prior art, the noise suppression method of the main transmission system of the machining center actively reduces noise by installing the noise sensor and the active noise control module on the machining center and installing the sound-proof housing for passive noise reduction, the first noise sensor arranged on the machining center and the second noise sensor arranged on the outer side of the sound-proof housing are used for respectively collecting the original first noise signal and the residual second noise signal after noise reduction of the machining center, the first noise signal is processed and then an inversion signal opposite to the first noise signal is generated for actively reducing noise, then the second noise signal is obtained after the noise reduction of the sound-proof housing is performed, the error signal is obtained by calculating the error signal of the second noise signal and the error signal of a desired signal preset by a user, and the inversion signal is adjusted through feedback of the error signal until the error signal is minimum, so that the noise reduction effect can be best.
Therefore, the method for suppressing the noise of the main transmission system of the machining center based on the combination of active noise reduction and passive noise reduction has the advantages that compared with the traditional mode of changing the mechanical structure of the machining center, the method for suppressing the noise of the main transmission system of the machining center actively reduces the noise by generating an opposite-phase signal opposite to the noise, the signal obtained by final noise reduction is used as feedback, the opposite-phase signal is updated and adjusted, meanwhile, a sound-proof cover is arranged on the outer side of the machining center to perform passive noise reduction, and the noise reduction effect is further improved.
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a noise suppression device of a main transmission system of a machining center in a hardware operating environment of the device according to an embodiment of the present application.
The terminal device in the embodiment of the application may be a machining center.
As shown in fig. 1, the machining center main drive system noise suppression apparatus may include: a processor 1001, such as a CPU, memory 1005, and a communication bus 1002. Wherein a communication bus 1002 is used to enable connected communication between the processor 1001 and a memory 1005. The memory 1005 may be a high-speed RAM memory or a stable memory (non-volatile memory), such as a disk memory. The memory 1005 may also optionally be a storage device separate from the processor 1001 described above.
Optionally, the machining center main drive train noise suppression apparatus may further include a user interface 1003, a network interface 1004, a camera, an RF (Radio Frequency) circuit, a sensor, an audio circuit, a WiFi module, and the like. The user interface may comprise a Display, an input sub-module such as a Keyboard (Keyboard), and optionally may comprise a standard wired interface, a wireless interface. The network interface may optionally include a standard wired interface, a wireless interface (e.g., WIFI interface).
Those skilled in the art will appreciate that the machining center main drive train noise suppression apparatus configuration shown in fig. 1 is not limiting of the machining center main drive train noise suppression apparatus and may include more or fewer components than shown, or certain components may be combined, or a different arrangement of components.
As shown in fig. 1, an operating system, a network communication module, and a machining center main drive system noise suppression program may be included in a memory 1005, which is a type of computer storage medium. The operating system is a program that manages and controls machining center main drive train noise suppression equipment hardware and software resources, supporting the operation of machining center main drive train noise suppression programs, as well as other software and/or programs. The network communication module is used to enable communication between components within the memory 1005 and other hardware and software in the machining center main drive train noise suppression arrangement.
In the machining center main drive train noise suppression apparatus shown in fig. 1, the processor 1001 is configured to execute a machining center main drive train noise suppression program stored in the memory 1005, and to perform the following operations:
collecting a first noise signal in real time through the first noise sensor, and collecting a second noise signal in real time through the second noise sensor;
processing the first noise signal to obtain the spectrum characteristic of the first noise signal;
controlling the active noise control module to output an inverted signal inverted with the first noise signal according to the frequency spectrum characteristic;
and acquiring an error signal between a preset expected signal and the second noise signal, generating a new phase inversion signal according to the error signal, and outputting the new phase inversion signal to perform noise suppression.
Further, the processor 1001 may call a machining center main drive train noise suppression program stored in the memory 1005, and further perform the following operations:
generating an inverted signal inverted from the first noise signal by the adaptive filter and the spectral feature;
outputting the inverted signal through the vibrator.
Further, the processor 1001 may call a machining center main drive train noise suppression program stored in the memory 1005, and further perform the following operations:
Determining a corresponding target frequency band of each channel in the frequency spectrum characteristic, wherein the corresponding target frequency bands of each channel are different;
an inverted signal inverted from the first noise signal is generated by each of the channels and each of the target frequency bands.
Further, the processor 1001 may call a machining center main drive train noise suppression program stored in the memory 1005, and further perform the following operations:
calculating a product of the error signal and the first noise signal;
updating the weight of the adaptive filter according to the product;
generating a new inverted signal inverted from the first noise signal by the updated adaptive filter and the spectral feature, and outputting the new inverted signal by the vibrator.
Further, the processor 1001 may call a machining center main drive train noise suppression program stored in the memory 1005, and further perform the following operations:
when the first noise signal is smaller than a preset decibel threshold value, the active noise control module is closed;
and displaying the signal data of the first noise signal through the display equipment.
Further, the processor 1001 may call a machining center main drive train noise suppression program stored in the memory 1005, and further perform the following operations:
Judging whether the error signal is larger than a preset error threshold value or not;
and if the error signal is larger than the error threshold, displaying prompt information for improving the sound insulation coefficient of the sound insulation cover through the display equipment.
Further, the processor 1001 may call a machining center main drive train noise suppression program stored in the memory 1005, and further perform the following operations:
if the error signal is not greater than the error threshold, storing the spectral characteristics, the inverted signal and the sound insulation coefficient of the sound insulation cover in an associated manner;
and if the frequency spectrum characteristic is the same as the stored historical frequency spectrum characteristic, outputting a historical reverse phase signal corresponding to the historical frequency spectrum characteristic through the vibrator, and displaying a historical sound insulation coefficient corresponding to the historical frequency spectrum characteristic through the display equipment.
The embodiment of the application provides a processing center main transmission system noise suppression method, which is applied to a processing center, and comprises the following steps: the processing center main part, first noise sensor, second noise sensor, initiative noise control module, sound proof housing, first noise sensor sets up in the processing center main part, the second noise sensor sets up the sound proof housing outside, the sound proof housing sets up the outside of processing center main part.
Based on the above hardware configuration, the following embodiments of the present application are presented.
In a first embodiment of the present application, referring to fig. 2, a method for suppressing noise in a main transmission system of a machining center includes:
step S10, collecting a first noise signal in real time through the first noise sensor, and collecting a second noise signal in real time through the second noise sensor;
it should be noted that, in this embodiment, the first noise sensor may be disposed at a critical position of the main transmission system, for example, a contact surface of the main shaft, the driving device, or the transmission component, so as to monitor the noise level generated by the main transmission mechanism in real time.
In addition, the second noise sensor is arranged outside the sound-proof housing and is used for monitoring noise heard by human ears after noise reduction.
In the embodiment, during the working process of the machining center, the first noise signal generated by the main transmission mechanism during working is collected through the first noise sensor in real time, and the second noise signal which can be heard by human ears is collected through the second noise sensor.
Step S20, processing the first noise signal to obtain the frequency spectrum characteristic of the first noise signal;
In this embodiment, after the processing center collects the first noise signal, the processor processes the first noise signal to obtain the spectral feature of the first noise signal for subsequent processing.
Step S30, controlling the active noise control module to output an inverted signal inverted with the first noise signal according to the frequency spectrum characteristics;
in this embodiment, after the processing center obtains the spectral feature of the first noise signal, the processing center calculates an inversion signal that is inverted to the first noise signal through a preset adaptive control algorithm, and outputs the inversion signal through the active noise control module, where the inversion signal and the first noise signal can be used to cancel the noise signal, so as to achieve the purpose of noise reduction.
Further, in a possible embodiment, the active noise control module includes: an adaptive filter and a vibrator;
the step S30 controls the active noise control module to output an inverted signal inverted from the first noise signal according to the spectral characteristics, including:
step S301 of generating an inverted signal inverted to the first noise signal by the adaptive filter and the spectral feature;
Step S302, outputting the inverted signal through the vibrator.
It should be noted that the adaptive control algorithm may be an LMS (Least Mean Squares, least mean square) algorithm, and the objective of the adaptive filter is to minimize the mean square error between the output signal and the desired signal. The algorithm approximates the output of the filter to the desired signal by adjusting the weights of the filter so that the error gradually decreases. The LMS algorithm updates the weights of the filters based on the product of the input signal and the error signal.
The vibrator may be provided in a plurality of different positions of the machining center, and may be installed to cover the transmission of the noise signal in all directions.
In this embodiment, after the processing center obtains the spectral feature of the first noise signal, the processing center calculates an inversion signal that is inverted to the first noise signal through an adaptive filter based on the LMS algorithm, and outputs the inversion signal through the vibrator, where the inversion signal and the first noise signal can be used to cancel the noise signal, so as to achieve the purpose of noise reduction.
Further, in a possible embodiment, the adaptive filter comprises a plurality of channels;
the step S301 of generating an inverted signal inverted from the first noise signal by the adaptive filter and the spectral feature includes:
Step S3011, determining a target frequency band corresponding to each channel in the spectrum characteristic, where the target frequency bands corresponding to each channel are different;
step S3012, generating an inverted signal inverted from the first noise signal by each of the channels and each of the target frequency bands.
In this embodiment, a plurality of adaptive filters may be designed, each of which controls noise in a different frequency range, in consideration of the possibility that noise sources are generated in a plurality of frequency ranges. This can improve the robustness of the system and noise suppression effect.
In this embodiment, filters for different frequency bands are designed according to the actual noise range, and after determining the frequency band corresponding to each filter, the noise signal is processed by the multi-channel filter to obtain an inverted signal inverted with the first noise signal.
Step S40, obtaining an error signal between a preset expected signal and the second noise signal, generating a new phase inversion signal according to the error signal and outputting the new phase inversion signal to perform noise suppression.
In this embodiment, when the user sets the adaptive control algorithm, an expected signal expected to be achieved may be set, or may default to be 0, after noise of the machining center is reduced, the second noise signal is noise that may be heard by a worker after noise reduction, an error signal is obtained by calculating a difference between the second noise signal and the expected signal, and the error signal is used as feedback to adjust the adaptive control algorithm, so that an output inversion signal is adjusted until the error signal is minimized, and an optimal noise reduction effect may be achieved.
Further, in a possible embodiment, in the step S40, the step of generating and outputting a new inverted signal according to the error signal includes:
step S401, calculating the product of the error signal and the first noise signal;
step S402, updating the weight of the adaptive filter according to the product;
step S403, generating a new inversion signal inverted to the first noise signal through the updated adaptive filter and the spectral feature, and outputting the new inversion signal through the vibrator.
In this embodiment, the adaptive filter based on the LMS algorithm may update the weight of the filter itself according to the product of the error signal and the first noise signal, so that a new inversion signal is obtained through the filter processing, and then the new inversion signal is output through the vibrator.
In addition, the introduction of a non-linear adaptive filter can better handle complex noise signals, especially at high noise levels. For example, an NLMS (Normalized Least Mean Squares, normalized least mean square) algorithm may be employed, which is a modified version of the LMS algorithm that improves the convergence performance of the algorithm by normalizing the weights.
Also, the conventional LMS algorithm uses a fixed learning rate, but in practical applications, noise levels and environmental conditions may vary. Therefore, an adaptive learning rate strategy is introduced, the learning rate is dynamically adjusted according to the system state, and the adaptability and the convergence rate of the algorithm can be improved.
During actual use, the noise control system may require continuous learning and optimization, particularly as may occur after long periods of operation. Therefore, the incremental learning strategy is introduced, so that the algorithm and parameters can be gradually optimized in the running of the real-time system, and the optimal performance of the system can be maintained.
Specifically, in the working process of the machining center, please refer to fig. 3, fig. 3 is a signal conversion schematic diagram of an embodiment of a noise suppression method of a main transmission system of the machining center, as shown in fig. 3, after the machining center obtains a first noise signal, a preset NLMS algorithm is adopted to process the first noise signal to obtain an inverted signal of the pre-first noise signal, the inverted signal is output through a vibrator to offset the inverted signal from the first noise signal, after the sound insulation of a sound-proof cover is performed, a second noise signal is collected, after an error signal is obtained by differentiating the second noise signal with a desired signal preset by a technician, the error signal is used as feedback to adjust various parameters of the NLMS algorithm, weights of various filters and the like, and the inverted signal is adjusted until the error signal reaches the minimum.
In this embodiment, compared with the technical means of changing the mechanical structure of the machining center in the prior art, the noise suppression method of the main transmission system of the machining center performs active noise reduction by installing the noise sensor and the active noise control module on the machining center and installing the sound-proof housing to perform passive noise reduction, the first noise sensor installed on the machining center and the second noise sensor installed on the outer side of the sound-proof housing are used for respectively collecting the original first noise signal and the second noise signal remained after noise reduction of the machining center, the first noise signal is processed and then an inversion signal opposite to the first noise signal is generated to perform active noise reduction, then the second noise signal is obtained after the passive noise reduction of the sound-proof housing, the error signal of the second noise signal and the error signal of the expected signal preset by a user is calculated to obtain the error signal, and the inversion signal is adjusted through feedback of the error signal until the error signal is minimum, so that the noise reduction effect can be best.
Therefore, the method for suppressing the noise of the main transmission system of the machining center based on the combination of active noise reduction and passive noise reduction has the advantages that compared with the traditional mode of changing the mechanical structure of the machining center, the method for suppressing the noise of the main transmission system of the machining center actively reduces the noise by generating an inversion signal which is opposite to the noise, the signal obtained by final noise reduction is used as feedback, the inversion signal is updated and adjusted, meanwhile, a sound-insulating cover is arranged on the outer side of the machining center to perform passive noise reduction, the noise reduction effect is further improved, in addition, an error signal is used as a parameter to enable an algorithm of signal processing to perform self optimization and adjustment, and the noise reduction level is optimized.
Further, based on the first embodiment of the method for suppressing noise of the main transmission system of the machining center of the present application, a second embodiment of the method for suppressing noise of the main transmission system of the machining center of the present application is proposed.
In a second embodiment of the present machining center main drive train noise suppression method, the machining center includes: a display device;
after the step of generating a new inverted signal from the error signal and outputting the new inverted signal in the above step S40, the method further includes:
a10, closing the active noise control module when the first noise signal is smaller than a preset decibel threshold value;
and step A20, displaying the signal data of the first noise signal through the display equipment.
In this embodiment, when the machining center is in the working process, if the first noise signal is smaller than the preset decibel threshold, it is determined that all noise can be isolated only by means of the sound-proof cover, so that the active noise control module can be turned off, energy is saved, and then in order to enable a technician to more intuitively observe the noise level at that time, signal data of the noise signal can be displayed in the display device, for example, a decibel and a amplitude-frequency curve of the noise signal are displayed.
Further, in a possible embodiment, referring to fig. 4, after the step of generating and outputting a new inverted signal according to the error signal in the step S40, the method further includes:
step B10, judging whether the error signal is larger than a preset error threshold value;
and step B20, if the error signal is larger than the error threshold value, displaying prompt information for improving the sound insulation coefficient of the sound insulation cover through the display equipment.
In this embodiment, after the active noise control module determines that the optimal noise reduction level has been reached, it is determined whether the error signal at this time is greater than a preset error threshold, if so, it indicates that the sound insulation coefficient of the sound insulation cover is insufficient, and the processing center displays a prompt message through the display device, so as to remind a technician to increase the sound insulation coefficient of the sound insulation cover, where the means for increasing the sound insulation coefficient may be to replace the material of the sound insulation cover, increase the thickness of the sound insulation cover, and so on.
Further, in a possible embodiment, after the step of determining whether the error signal is greater than the preset error threshold in the step B10, the method further includes:
step B30, if the error signal is not greater than the error threshold, storing the spectral characteristics, the inverted signal and the sound insulation coefficient of the sound insulation cover in an associated manner;
And step B40, outputting a history reverse signal corresponding to the history spectrum characteristic through the vibrator if the spectrum characteristic is the same as the stored history spectrum characteristic, and displaying a history sound insulation coefficient corresponding to the history spectrum characteristic through the display device.
In this embodiment, if the error signal after the noise reduction processing is not greater than the error threshold, it indicates that the noise reduction effect is good, and the noise spectrum, the inverted signal and the sound insulation coefficient of the sound insulation cover that are identified at this time may be stored in association, and in the subsequent processing work, if the noise with the same or similar spectrum characteristics as the stored historical spectrum characteristics is identified, the noise reduction processing may be directly performed by adopting the inverted signal corresponding to the historical spectrum characteristics and the sound insulation cover corresponding to the sound insulation coefficient, so as to reduce the calculation amount.
Specifically, a display device is arranged on the processing center and can be used for displaying data information in the noise reduction process, when the first noise signal is detected to be smaller than a preset decibel threshold value, the active noise control module can be closed, the noise-proof cover is only used for passive noise reduction, then data of the noise signal are displayed on the display device for reference of technicians, after the active noise reduction reaches the optimal value, if the noise is still larger than an error threshold value, the technicians are prompted on the real device to improve the sound insulation coefficient of the noise-proof cover, and if the noise is not larger than the error threshold value, the brand and the characteristics of the noise reduction, the inverted signal and the sound insulation coefficient are stored in an associated mode, so that the noise is used later.
In addition, in the present embodiment, the position of the soundproof cover is not fixed, and a plurality of first noise sensors may be provided, and the path of noise is identified based on noise detected by the respective sensors, thereby modeling the shape and position of the soundproof cover, and optimizing the noise reduction effect of the soundproof cover.
In this embodiment, the method for suppressing noise of the main transmission system of the machining center based on the method for combining active noise reduction and passive noise reduction can remind a technician to adjust the sound-proof cover when the noise reduction level of the passive noise reduction part of the display device is insufficient compared with the traditional mode of changing the mechanical structure of the machining center, and can further improve the sound-proof effect compared with the method for directly adopting the sound-proof cover to the machining center to insulate sound, thereby improving the noise reduction effect.
In addition, referring to fig. 5, fig. 5 is a schematic functional block diagram of a main transmission system noise suppression device of a machining center according to the present application, and the present application further provides a main transmission system noise suppression device of a machining center, where the main transmission system noise suppression device of the machining center is applied to the machining center, and the machining center includes: the device comprises a machining center main body, a first noise sensor, a second noise sensor, an active noise control module and a sound-proof cover, wherein the first noise sensor is arranged on the machining center main body, the second noise sensor is arranged on the outer side of the sound-proof cover, and the sound-proof cover is arranged on the outer side of the machining center main body;
The machining center main transmission system noise suppression device comprises:
a noise acquisition module 10, configured to acquire a first noise signal in real time through the first noise sensor, and acquire a second noise signal in real time through the second noise sensor;
a signal processing module 20, configured to process the first noise signal to obtain a spectral feature of the first noise signal;
an active noise reduction module 30, configured to control the active noise control module to output an inverted signal inverted from the first noise signal according to the spectral feature;
and the feedback module 40 is configured to acquire an error signal between a preset desired signal and the second noise signal, generate a new inverted signal according to the error signal, and output the new inverted signal to perform noise suppression.
Optionally, the active noise reduction module includes:
an inverted signal output unit for generating an inverted signal inverted from the first noise signal by the adaptive filter and the spectral feature; outputting the inverted signal through the vibrator.
Optionally, the inverted signal output unit includes:
the multichannel filtering unit is used for determining the corresponding target frequency bands of each channel in the frequency spectrum characteristics, wherein the corresponding target frequency bands of each channel are different; an inverted signal inverted from the first noise signal is generated by each of the channels and each of the target frequency bands.
Optionally, the feedback module includes:
a weight adjustment module for calculating a product of the error signal and the first noise signal; updating the weight of the adaptive filter according to the product; generating a new inverted signal inverted from the first noise signal by the updated adaptive filter and the spectral feature, and outputting the new inverted signal by the vibrator.
Optionally, the machining center main drive system noise suppression device further includes:
the decibel control module is used for closing the active noise control module when the first noise signal is smaller than a preset decibel threshold value;
and the signal display module is used for displaying the signal data of the first noise signal through the display equipment.
Optionally, the machining center main drive system noise suppression device further includes:
the error judging module is used for judging whether the error signal is larger than a preset error threshold value or not;
and the prompting module is used for displaying prompting information for improving the sound insulation coefficient of the sound insulation cover through the display equipment if the error signal is larger than the error threshold value.
Optionally, the machining center main drive system noise suppression device further includes:
The storage module is used for storing the frequency spectrum characteristics, the phase-inverted signals and the sound insulation coefficients of the sound insulation cover in an associated mode if the error signals are not larger than the error threshold value; and if the frequency spectrum characteristic is the same as the stored historical frequency spectrum characteristic, outputting a historical reverse phase signal corresponding to the historical frequency spectrum characteristic through the vibrator, and displaying a historical sound insulation coefficient corresponding to the historical frequency spectrum characteristic through the display equipment.
The specific implementation manner of the noise suppression device of the main transmission system of the machining center is basically the same as the above embodiments of the noise suppression method of the main transmission system of the machining center, and will not be repeated here.
In addition, the present application also proposes a computer storage medium having stored thereon a processing center main drive train noise suppression program which, when executed by a processor, implements the steps of the processing center main drive train noise suppression method of the present application as described above.
The specific embodiments of the computer storage medium in the present application are substantially the same as the embodiments of the noise suppression method of the main transmission system of the machining center, and are not described herein.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing embodiment numbers of the present application are merely for describing, and do not represent advantages or disadvantages of the embodiments.
From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk), comprising several instructions for causing a terminal device (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to perform the method described in the embodiments of the present application.
The foregoing description is only of the preferred embodiments of the present application, and is not intended to limit the scope of the claims, and all equivalent structures or equivalent processes using the descriptions and drawings of the present application, or direct or indirect application in other related technical fields are included in the scope of the claims of the present application.
Claims (7)
1. A machining center main drive system noise suppression method, wherein the machining center main drive system noise suppression method is applied to a machining center, the machining center comprising: the device comprises a machining center main body, a first noise sensor, a second noise sensor, an active noise control module, a sound-proof cover and display equipment, wherein the first noise sensor is arranged on the machining center main body, the second noise sensor is arranged on the outer side of the sound-proof cover, and the sound-proof cover is arranged on the outer side of the machining center main body; the active noise control module includes: an adaptive filter and a vibrator;
the noise suppression method for the main transmission system of the machining center comprises the following steps:
collecting a first noise signal in real time through the first noise sensor, and collecting a second noise signal in real time through the second noise sensor;
Processing the first noise signal to obtain the spectrum characteristic of the first noise signal;
controlling the active noise control module to output an inverted signal inverted with the first noise signal according to the frequency spectrum characteristic;
acquiring an error signal between a preset expected signal and the second noise signal, generating a new phase inversion signal according to the error signal, and outputting the new phase inversion signal to perform noise suppression;
judging whether the error signal is larger than a preset error threshold value or not;
if the error signal is larger than the error threshold, displaying prompt information for improving the sound insulation coefficient of the sound insulation cover through the display equipment;
if the error signal is not greater than the error threshold, storing the spectral characteristics, the inverted signal and the sound insulation coefficient of the sound insulation cover in an associated manner;
outputting a history reverse phase signal corresponding to the history spectrum characteristic through the vibrator if the spectrum characteristic is the same as the stored history spectrum characteristic, and displaying a history sound insulation coefficient corresponding to the history spectrum characteristic through the display device;
the step of generating and outputting a new inverted signal according to the error signal includes:
Calculating a product of the error signal and the first noise signal;
updating the weight of the adaptive filter according to the product;
generating a new inverted signal inverted from the first noise signal by the updated adaptive filter and the spectral feature, and outputting the new inverted signal by the vibrator.
2. The method of claim 1, wherein the step of controlling the active noise control module to output an inverted signal that is inverted from the first noise signal based on the spectral characteristics comprises:
generating an inverted signal inverted from the first noise signal by the adaptive filter and the spectral feature;
outputting the inverted signal through the vibrator.
3. The machining center main drive system noise suppression method according to claim 2, wherein the adaptive filter includes a plurality of channels;
the step of generating an inverted signal inverted from the first noise signal by the adaptive filter and the spectral feature, comprises:
determining a corresponding target frequency band of each channel in the frequency spectrum characteristic, wherein the corresponding target frequency bands of each channel are different;
An inverted signal inverted from the first noise signal is generated by each of the channels and each of the target frequency bands.
4. The machining center main drive system noise suppression method according to claim 2, characterized in that after the step of generating a new inverted signal from the error signal and outputting, the method further comprises:
when the first noise signal is smaller than a preset decibel threshold value, the active noise control module is closed;
and displaying the signal data of the first noise signal through the display equipment.
5. A machining center main drive system noise suppression device, wherein the machining center main drive system noise suppression device is applied to a machining center, the machining center comprising: the device comprises a machining center main body, a first noise sensor, a second noise sensor, an active noise control module, a sound-proof cover and display equipment, wherein the first noise sensor is arranged on the machining center main body, the second noise sensor is arranged on the outer side of the sound-proof cover, and the sound-proof cover is arranged on the outer side of the machining center main body; the active noise control module includes: an adaptive filter and a vibrator;
The machining center main transmission system noise suppression device comprises:
the noise acquisition module is used for acquiring a first noise signal in real time through the first noise sensor and acquiring a second noise signal in real time through the second noise sensor;
the signal processing module is used for processing the first noise signal to obtain the frequency spectrum characteristic of the first noise signal;
the active noise reduction module is used for controlling the active noise control module to output an inversion signal which is inverted with the first noise signal according to the frequency spectrum characteristics;
the feedback module is used for acquiring an error signal between a preset expected signal and the second noise signal, generating a new reverse signal according to the error signal and outputting the new reverse signal so as to perform noise suppression;
the error judging module is used for judging whether the error signal is larger than a preset error threshold value or not;
the prompting module is used for displaying prompting information for improving the sound insulation coefficient of the sound insulation cover through the display equipment if the error signal is larger than the error threshold value;
the storage module is used for storing the frequency spectrum characteristics, the phase-inverted signals and the sound insulation coefficients of the sound insulation cover in an associated mode if the error signals are not larger than the error threshold value; outputting a history reverse phase signal corresponding to the history spectrum characteristic through the vibrator if the spectrum characteristic is the same as the stored history spectrum characteristic, and displaying a history sound insulation coefficient corresponding to the history spectrum characteristic through the display device;
The feedback module comprises:
a weight adjustment module for calculating a product of the error signal and the first noise signal; updating the weight of the adaptive filter according to the product, and normalizing the weight; generating a new inverted signal inverted from the first noise signal by the updated adaptive filter and the spectral feature, and outputting the new inverted signal by the vibrator.
6. A machining center main drive system noise suppression apparatus, the machining center main drive system noise suppression apparatus comprising: a memory, a processor, wherein the memory has stored thereon a machining center main drive train noise suppression program that when executed by the processor performs the steps of the machining center main drive train noise suppression method of any one of claims 1 to 4.
7. A computer storage medium, wherein a machining center main drive train noise suppression program is stored on the computer storage medium, which when executed by a processor, implements the steps of the machining center main drive train noise suppression method according to any one of claims 1 to 4.
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| KR20220071539A (en) * | 2020-11-24 | 2022-05-31 | 현대위아 주식회사 | Apparatus for reducing noise of machine tool and control method thereof |
| CN115574360A (en) * | 2022-09-29 | 2023-01-06 | 宁波方太厨具有限公司 | Range hood, active noise reduction method and device thereof, and computer readable storage medium |
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| US6684233B1 (en) * | 1999-05-20 | 2004-01-27 | Nec Corporation | Adaptive filter, control method of adaptive filter and storage medium storing therein program thereof |
| CN101354885A (en) * | 2007-01-16 | 2009-01-28 | 哈曼贝克自动系统股份有限公司 | Active noise control system |
| KR20220071539A (en) * | 2020-11-24 | 2022-05-31 | 현대위아 주식회사 | Apparatus for reducing noise of machine tool and control method thereof |
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