Noise control system and method for large heavy dump truck in open pit coal mine

Abstract

The invention provides a noise control system and method for a large heavy dump truck in an open pit coal mine, and the system comprises a noise monitoring module which is connected with a central control module and is used for collecting the noise data of a plurality of target parts of the truck in real time, and transmitting the noise data to the central control module; the central control module is connected with the noise monitoring module and the noise reduction execution module, and is used for analyzing the noise data to obtain a noise analysis result, generating a corresponding noise reduction control signal according to the noise analysis result and a working condition, and sending the noise reduction control signal to the noise reduction execution module; the noise reduction execution module is connected with the central control module and used for receiving the noise reduction control signal and executing corresponding noise reduction operation based on the noise reduction control signal; the noise reduction execution module comprises at least one of an engine control unit, an exhaust system adjusting unit, an active noise reduction unit and a suspension control unit.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of noise control and electronic control technology of heavy vehicles, and in particular to a noise control system and method for large heavy self-unloading trucks in open-pit coal mines. BACKGROUND

[0002] Large heavy self-unloading trucks in open-pit coal mines are the main transportation tools in mines, which will generate high-intensity noise during operation. The noise sources are extensive, including engine operation, mechanical component friction, exhaust process, and tire friction with the ground. These noises not only seriously affect the physical and mental health of mine workers, and long-term exposure to high noise environments can lead to hearing loss, neurasthenia and other diseases, but also cause noise pollution to the surrounding ecological environment and interfere with the normal life of wild animals. The existing noise control methods have limited effect. For example, traditional soundproofing materials can block part of the noise, but they have poor inhibitory effect on high-frequency noise and vibration noise generated by key parts such as engines; simple mufflers cannot meet the high-efficiency noise reduction demand when dealing with exhaust noise of high-power engines. Therefore, it is urgent to develop an efficient noise control technology for large heavy self-unloading trucks in open-pit coal mines. SUMMARY

[0003] The purpose of the present application is to provide a noise control system and method for large heavy self-unloading trucks in open-pit coal mines, which aims to solve the above problems in the prior art.

[0004] The present application provides a noise control system for large heavy self-unloading trucks in open-pit coal mines, comprising: A noise monitoring module connected to a central control module, configured to collect noise data of multiple target parts of the truck in real time and transmit the noise data to the central control module; A central control module connected to the noise monitoring module and a noise reduction execution module, configured to analyze the noise data to obtain noise analysis results, generate corresponding noise reduction control signals according to the noise analysis results and working conditions, and send the noise reduction control signals to the noise reduction execution module; A noise reduction execution module connected to the central control module, configured to receive the noise reduction control signals and execute corresponding noise reduction operations based on the noise reduction control signals; The noise reduction execution module comprises at least one of an engine control unit, an exhaust system adjustment unit, an active noise reduction unit, and a suspension control unit.

[0005] The present application provides a noise control method for large heavy self-unloading trucks in open-pit coal mines, comprising: Collecting noise data of multiple target parts of the truck in real time by a noise monitoring module and transmitting the noise data to a central control module; The noise data is analyzed by the central control module to obtain a noise analysis result, and a corresponding noise reduction control signal is generated according to the noise analysis result and a working condition, and the noise reduction control signal is sent to a noise reduction execution module; The noise reduction control signal is received by the noise reduction execution module, and a corresponding noise reduction operation is performed based on the noise reduction control signal.

[0006] The embodiments of the present application can have the following beneficial effects: The embodiments of the present application can comprehensively and effectively reduce various noises generated by large heavy self-unloading trucks in an open coal mine during operation by using a multi-dimensional noise control device and an intelligent control method, and the noise reduction effect is remarkable, which can greatly improve the noise environment of the mine area. BRIEF DESCRIPTION OF DRAWINGS

[0007] In order to more clearly illustrate the technical solutions in the one or more embodiments of the present specification or the prior art, the drawings needed to be used in the embodiment or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments described in the present specification, and other drawings can be obtained by those skilled in the art without creative labor.

[0008] Figure 1 is a schematic diagram of a noise control system for large heavy self-unloading trucks in an open coal mine according to an embodiment of the present application; Figure 2 is a flowchart of a noise control method for large heavy self-unloading trucks in an open coal mine according to an embodiment of the present application. DETAILED DESCRIPTION

[0009] In order to make the technical personnel in the art better understand the technical solutions in the one or more embodiments of the present specification, the technical solutions in the one or more embodiments of the present specification will be described clearly and completely below with reference to the drawings in the one or more embodiments of the present specification. Obviously, the described embodiments are only some embodiments of the present specification, not all embodiments. Based on the one or more embodiments of the present specification, all other embodiments obtained by those skilled in the art without creative labor should belong to the protection scope of the present document.

[0010] System Embodiments According to the embodiments of the present application, a noise control system for large heavy self-unloading trucks in an open coal mine is provided, Figure 1 is a schematic diagram of a noise control system for large heavy self-unloading trucks in an open coal mine according to an embodiment of the present application, as Figure 1 shown, the noise control system for large heavy self-unloading trucks in an open coal mine according to the embodiments of the present application specifically comprises: The noise monitoring module 10 is connected with the central control module, and is used for collecting noise data of multiple target positions of the truck in real time, and transmitting the noise data to the central control module. The multiple target positions include an engine compartment, an exhaust port, a tire vicinity, and a cab.

[0011] The central control module 12 is connected with the noise monitoring module and the noise reduction execution module, is used for analyzing the noise data to obtain a noise analysis result, and generating a corresponding noise reduction control signal according to the noise analysis result and a working condition, and sending the noise reduction control signal to the noise reduction execution module, and is specifically used for: analyzing the noise data in real time to obtain a noise analysis result, comparing the noise analysis result with a preset noise threshold, and generating a noise reduction control signal in combination with a working condition under different operation scenes when the noise analysis result exceeds the noise threshold; The noise analysis result includes a main source, an intensity, and a frequency characteristic of the noise. The noise reduction control signal is used for selectively starting one or more of an engine control unit, an exhaust system adjusting unit, an active noise reduction unit, and a suspension control unit based on the main source. The central control module further includes: A self-learning and optimization unit is used for establishing a noise reduction strategy effect model based on historical noise data and noise reduction effect records, and adaptively optimizing a noise reduction control strategy of the system based on the noise reduction strategy effect model.

[0012] The noise reduction execution module 14 is connected with the central control module, and is used for receiving the noise reduction control signal, and performing a corresponding noise reduction operation based on the noise reduction control signal. The noise reduction execution module includes at least one of an engine control unit, an exhaust system adjusting unit, an active noise reduction unit, and a suspension control unit. The engine control unit is used for optimizing a combustion process by adjusting an injection strategy and an ignition time of the engine. The exhaust system adjusting unit is used for optimizing exhaust gas flow by adjusting a sectional area of a variable-section exhaust tail pipe. The active noise reduction unit is used for canceling engine noise by emitting sound waves with opposite phases through a loudspeaker arranged in the engine compartment. The suspension control unit is used for optimizing a contact pressure of the tire and the ground by adjusting parameters of a vehicle suspension system.

[0013] The system also comprises a physical noise reduction assembly integrated in the truck body, the physical noise reduction assembly comprising at least one of an engine compartment soundproofing assembly, an exhaust noise reduction device, a noise reduction tire assembly, and a cab soundproofing assembly; wherein "assembly" refers to a component assembled from multiple parts and having a specific function; The engine compartment soundproofing assembly comprises, from the inside to the outside, a high-temperature-resistant damping layer, an acoustic cotton layer, and a metal protective plate layer; The exhaust noise reduction device comprises a multi-stage impedance composite muffler; wherein the multi-stage impedance composite muffler is composed of an expansion chamber, a resonance cavity, and sound-absorbing material; the exhaust noise reduction device also comprises a variable cross-section exhaust tail pipe connected to the multi-stage impedance composite muffler; The noise reduction tire assembly comprises a tire with noise reduction patterns on the tread, a sound-absorbing material layer filled inside the tire, and a rubber shock pad provided at the connection between the hub and the tire; The cab soundproofing assembly comprises a soundproofing layer and a sound-absorbing filling layer provided on the inner wall, floor, and / or ceiling of the cab, double-layer laminated soundproof glass, and a door and window sealing rubber strip.

[0014] The above technical solutions of the embodiments of the present application will be described in detail in combination with the specific circumstances of the noise control system for large heavy-duty self-unloading trucks in open-pit coal mines.

[0015] The embodiments of the present application propose a noise control device for large heavy-duty self-unloading trucks in open-pit coal mines, specifically comprising: The engine compartment soundproofing assembly: a multi-layer composite soundproofing material is wrapped around the engine compartment, the innermost layer is a high-temperature-resistant and high-damping butyl rubber layer, which can effectively absorb the vibration energy on the surface of the engine and reduce the noise generated by vibration; the middle layer is glass fiber acoustic cotton, which can absorb medium and high frequency noise; the outer layer is a metal sheet, which plays a protective role for the internal materials and reflects part of the noise. Special sealing rubber strips are installed at each opening of the engine compartment, such as access holes and ventilation openings, to ensure the sealing of the engine compartment and prevent noise leakage.

[0016] The exhaust system noise reduction device: a multi-stage impedance composite muffler is installed on the exhaust pipe, which is composed of an expansion chamber, a resonance cavity, and sound-absorbing material. Different frequencies of sound waves are reflected and interfered in the expansion chamber and resonance cavity, thereby reducing noise energy. The sound-absorbing material further absorbs the remaining noise. At the rear end of the muffler, a variable cross-section exhaust tail pipe is installed, which adjusts the cross-sectional area of the tail pipe in real time according to different operating conditions of the engine (such as idle speed, acceleration, full load running, etc.) through an intelligent control system, optimizes the exhaust gas flow, and reduces the exhaust noise.

[0017] Tire Noise Reduction Structure: A new type of noise reduction tire is developed. The surface of the tire adopts a special pattern design, and the arrangement and shape between the pattern blocks are optimized to effectively reduce the noise generated by the friction between the tire and the ground. Inside the tire, sound-absorbing materials such as polyurethane foam are filled to absorb the noise generated by air vibration inside the tire. In addition, rubber shock pads are installed at the connection between the hub and the tire to reduce the vibration transmitted to the hub and the vehicle body when the tire rotates.

[0018] Cab Soundproofing Sealing System: The cab is comprehensively soundproofed. Soundproof felt is pasted on the inner walls, floor and ceiling of the cab, and sound-absorbing materials such as melamine foam are filled inside. The door and window glass of the cab is replaced with double-layer laminated soundproof glass, and high-quality sealing strips are installed on the door and window frames to ensure the sealing of the cab and effectively block external noise from entering the cab, providing a quiet and comfortable working environment for the driver.

[0019] Real-time Noise Monitoring: Multiple noise sensors are installed in the engine compartment, exhaust port, tire area and inside the cab to collect real-time noise data at different positions and transmit these data to the vehicle-mounted central control system.

[0020] Data Analysis and Processing: The central control system uses advanced noise analysis algorithms to analyze the collected noise data in real time, identifies the main sources and frequency characteristics of the noise, and automatically determines whether the current noise exceeds the standard and the noise control measures that need to be started according to different noise sources and noise intensity.

[0021] Intelligent Control Strategy: When the system detects that the engine noise exceeds the standard, it automatically adjusts the fuel injection strategy and ignition time of the engine to optimize the combustion process and reduce noise caused by incomplete combustion. At the same time, the active noise reduction function of the engine compartment soundproofing assembly is started, and speakers installed in the engine compartment emit sound waves with opposite phase to the engine noise for noise cancellation. For exhaust noise, the cross-sectional area of the variable cross-section tailpipe in the exhaust system noise reduction device is automatically adjusted according to the engine operating conditions to ensure that the silencer is in the best noise reduction state. If the tire noise is too high, the system adjusts the suspension system parameters of the vehicle to change the contact pressure between the tire and the ground, reducing the tire noise. In addition, when the vehicle is in different operating scenarios (such as loading, transportation and unloading), the system will flexibly adjust the working parameters of each noise control device according to the pre-set noise control scheme to achieve comprehensive and intelligent noise control.

[0022] Engine Compartment Soundproofing Assembly Installation: Multiple layers of composite soundproofing materials are accurately cut and pasted on the inner walls of the engine compartment according to design requirements to ensure tight wrapping without gaps. Sealing strips are installed at each opening to ensure sealing effectiveness. After installation, the soundproofing assembly is tested for sealing to check for any leaks.

[0023] Exhaust system noise reduction device installation: Install the multi-stage impedance composite muffler according to the size and layout of the exhaust pipe, ensure firm connection and good sealing. Connect the intelligent control system line of the variable cross-section exhaust tail pipe, debug the system to accurately adjust the tail pipe cross-sectional area according to the engine operating conditions. Test the performance of the exhaust system noise reduction device to detect the noise reduction effect under different operating conditions.

[0024] Tire noise reduction structure installation: Install the new noise reduction tire on the hub, ensure correct installation and fastening. Install rubber shock pads at the connection between the hub and the tire, check if the installation is in place. Check the sound-absorbing material inside the tire to ensure uniform filling.

[0025] Cab soundproofing and sealing system installation: Paste soundproof felt on the inner wall, floor and ceiling of the cab, fill sound-absorbing material to ensure construction quality. Replace double-layer laminated soundproof glass, install sealing rubber strips on the door and window frames, and conduct overall soundproofing and sealing test on the cab to check the soundproofing effect.

[0026] In summary, the key of the embodiment of the present application is: 1. Real-time noise monitoring system startup: Start the vehicle-mounted central control system and each noise sensor to ensure that the system can collect noise data in real time and accurately. Calibrate the noise sensor to ensure data reliability.

[0027] 2. Data analysis and control strategy verification: Observe the analysis results of the central control system on noise data during truck operation to verify the effectiveness of the noise control strategy. According to the actual operation, optimize and adjust the noise analysis algorithm and control strategy to ensure that the system can accurately and timely activate the corresponding noise control measures according to different noise sources and operating conditions.

[0028] 3. Long-term operation effect evaluation: Long-term operation test is conducted on the open-pit coal mine large heavy-duty self-unloading truck equipped with noise control devices and using new control methods. In different operating environments and conditions, the noise control effect is continuously monitored. Collect feedback from mine workers to further improve and perfect the system to ensure that the noise control device can play a long-term stable role and effectively reduce the noise of the truck.

[0029] Method embodiment According to the embodiment of the present application, a noise control method for an open-pit coal mine large heavy-duty self-unloading truck is provided, Figure 2 is the flow chart of the noise control method for the open-pit coal mine large heavy-duty self-unloading truck according to the embodiment of the present application, as Figure 2 shown, the noise control method for the open-pit coal mine large heavy-duty self-unloading truck according to the embodiment of the present application specifically includes: Step S201, the noise data of multiple target parts of the truck are collected in real time by a noise monitoring module, and the noise data are transmitted to a central control module; Step S202, the noise data are analyzed by the central control module to obtain noise analysis results, and corresponding noise reduction control signals are generated according to the noise analysis results and working conditions, and the noise reduction control signals are sent to a noise reduction execution module; Step S203, the noise reduction control signals are received by the noise reduction execution module, and corresponding noise reduction operations are performed based on the noise reduction control signals; The method further comprises: According to the real-time working scene of the truck, a preset noise control scheme is called, and the working parameters of each execution unit in the noise reduction execution module are dynamically adjusted according to the noise control scheme.

[0030] The embodiment of the application is a method embodiment corresponding to the above-mentioned system embodiment, and the specific operation of each step can be understood with reference to the description of the system embodiment, which will not be repeated here.

[0031] In summary, compared with the prior art, the beneficial effects of the embodiment of the application include: 1. Intelligent control: the real-time noise monitoring and data analysis system can automatically adjust the working parameters of the noise control device according to different noise sources and working conditions, realize intelligent and accurate noise control, and improve the efficiency and adaptability of noise control; 2. Improve comfort: effectively reduce the noise level in the cab, provide a quiet and comfortable working environment for the driver, reduce the fatigue and discomfort of the driver caused by noise, and improve the working safety and efficiency; 3. Energy saving and environmental protection: by optimizing the engine combustion process and exhaust system, the noise is reduced, the fuel economy of the engine is improved, the exhaust emission is reduced, and the dual goals of energy saving and environmental protection are achieved.

[0032] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the application, and not to limit them; although the application has been described in detail with reference to the above embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the above embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the application.

Claims

1. A noise control system for large heavy duty self-discharging trucks used in open cut coal mines characterised in that, The system comprises: a noise monitoring module connected with the central control module, used for collecting noise data of multiple target parts of the truck in real time and transmitting the noise data to the central control module; a central control module connected with the noise monitoring module and the noise reduction execution module, used for analyzing the noise data to obtain noise analysis results, and generating corresponding noise reduction control signals according to the noise analysis results and working conditions, and sending the noise reduction control signals to the noise reduction execution module; a noise reduction execution module connected with the central control module, used for receiving the noise reduction control signals and executing corresponding noise reduction operations based on the noise reduction control signals; wherein the noise reduction execution module comprises at least one of an engine control unit, an exhaust system adjusting unit, an active noise reduction unit and a suspension control unit.

2. The system of claim 1, wherein, The multiple target parts include an engine compartment, an exhaust port, a tire vicinity and a cab.

3. The system of claim 1, wherein, The central control module is specifically used for: real-time analysis of the noise data to obtain noise analysis results, comparison of the noise analysis results with a preset noise threshold, and generation of noise reduction control signals in combination with working conditions under different operation scenarios when the noise analysis results exceed the noise threshold; wherein the noise analysis results include the main source, intensity and frequency characteristics of the noise; the noise reduction control signals are selectively based on the main source to start one or more of the engine control unit, the exhaust system adjusting unit, the active noise reduction unit and the suspension control unit.

4. The system of claim 1, wherein, The engine control unit is used to optimize the combustion process by adjusting the fuel injection strategy and ignition time of the engine; the exhaust system adjusting unit is used to optimize the exhaust gas flow by adjusting the cross-sectional area of the variable cross-section exhaust tail pipe; the active noise reduction unit is used to cancel out the engine noise by emitting sound waves with opposite phases through the loudspeaker arranged in the engine compartment; the suspension control unit is used to optimize the contact pressure of the tire with the ground by adjusting the parameters of the vehicle suspension system.

5. The system of claim 1, wherein, The system further comprises a physical noise reduction assembly integrated in the truck body, which comprises at least one of an engine compartment sound insulation assembly, an exhaust noise reduction device, a noise reduction tire assembly and a cab sound insulation assembly.

6. The system of claim 5, wherein, The engine compartment sound insulation assembly comprises, from the inside to the outside, a high-temperature-resistant damping layer, an acoustic cotton layer and a metal protective plate layer; the exhaust noise reduction device comprises a multi-stage impedance composite muffler; wherein the multi-stage impedance composite muffler is composed of an expansion chamber, a resonance cavity and a sound-absorbing material; the noise reduction tire assembly comprises a tire with a noise reduction pattern on the tread, a sound-absorbing material layer filled in the tire, and a rubber shock pad arranged at the connection between the hub and the tire; the cab sound insulation assembly comprises a sound insulation layer and a sound-absorbing filling layer arranged on the inner wall, floor and / or ceiling of the cab, double-layer laminated sound insulation glass and door and window sealing rubber strips.

7. The system of claim 6, wherein, The exhaust noise reduction device further comprises a variable cross-section exhaust tail pipe connected with the multi-stage impedance composite muffler.

8. The system of claim 1, wherein, The central control module further comprises: The self-learning and optimization unit is configured to establish a noise reduction strategy effect model based on historical noise data and noise reduction effect records, and to perform adaptive optimization on the noise reduction control strategy of the system based on the noise reduction strategy effect model.

9. A noise control method for large heavy-duty self-discharging trucks in open-pit coal mines, for use in the system of any one of claims 1 to 8, the method comprising: collecting noise data of multiple target parts of the truck in real time by the noise monitoring module, and transmitting the noise data to the central control module; analyzing the noise data by the central control module to obtain noise analysis results, and generating corresponding noise reduction control signals according to the noise analysis results and the working conditions, and sending the noise reduction control signals to the noise reduction execution module; receiving the noise reduction control signals by the noise reduction execution module, and performing corresponding noise reduction operations based on the noise reduction control signals.

10. The method of claim 9, wherein, The method further comprises: calling a preset noise control scheme according to the real-time working scene of the truck, and dynamically adjusting the working parameters of each execution unit in the noise reduction execution module according to the noise control scheme.

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