Environment noise self-adaptive counteracting device

Abstract

The invention discloses an environment noise self-adaptive counteracting device which comprises a shell, a bottom plate, a main control device, a noise sensing device and a sound wave generating device, the shell is installed above the bottom plate, a plurality of through holes are evenly formed in the circumferential direction of the side wall and the top of the shell, and noise is collected and spread through the through holes; a plurality of supports are installed in the shell and on the bottom plate in the circumferential direction, a supporting table is installed in the middle of the bottom plate, a support is installed on the supporting table, the noise sensing device and the sound wave generating device are both installed on the supports, and the main control device is installed on the bottom plate. The power transmission and transformation project field environment noise can be collected in real time, wavelet analysis and sound production control are conducted on the environment noise through the main control device, sound waves which are the same as the environment noise in amplitude and opposite to the environment noise in phase are generated through the sound wave generating device for counteracting, and then the construction environment is improved, worker health is protected, and the project quality is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of noise suppression, and in particular relates to an environmental noise adaptive cancellation device. Background Art

[0002] With the improvement of social awareness of environmental protection, the country has vigorously promoted green construction. As an important infrastructure project, the construction of UHV power grid has carried out research on green construction technology, which is helpful to improve the quality of the project and ensure the safety of personnel. It is of great significance to the dual carbon goals and sustainable development. In recent years, the number of UHV transmission projects has continued to increase. The transmission distance of UHV transmission projects is long, the lines span a large area, and the engineering operation points are many and wide, requiring a large number of large-scale construction to carry out cross-construction operations. The noise generated during the construction of large-scale machinery on site has seriously affected the health of the construction workers on site and the safety of the natural ecosystem. The noise generated by large-scale construction machinery in the power transmission and transformation project has become more and more serious. The construction workers on site have no effective means of sound insulation and noise reduction. The operators cannot communicate normally, the information is not transmitted in time, and they cannot evacuate quickly in case of emergency. There are safety hazards. The noise control methods adopted on the site of the power transmission and transformation project, such as soundproof walls or earplugs, have limited effects, affecting the efficiency of on-site operations and delaying the progress of the project. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art and provide an environmental noise adaptive cancellation device, which can collect environmental noise at the power transmission and transformation project site in real time, perform wavelet analysis and sound control on the environmental noise through a main control device, and generate sound waves with the same amplitude and opposite phase as the environmental noise through a sound wave generating device to cancel the sound, thereby improving the construction environment, protecting the health of workers and improving the quality of the project.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] An environmental noise adaptive cancellation device comprises a shell, a base plate, a main control device, a noise sensing device, and a sound wave generating device. The shell is installed above the base plate, and a plurality of through holes are evenly opened in the circumferential direction of the side wall and the top of the shell, and noise is collected and transmitted through the through holes. A plurality of brackets are installed in the circumferential direction inside the shell and on the base plate, a support platform is installed in the middle of the base plate, and a bracket is installed on the support platform. The noise sensing device and the sound wave generating device are both installed on the bracket, and the noise sensing device is located on one side of the sound wave generating device. The main control device is installed on the base plate, and the input end of the main control device is electrically connected to the noise sensing device, and the output end is electrically connected to the sound wave generating device.

[0006] The noise sensing device includes a noise collection sensor, a signal processor and a digital collection board. The noise of large construction machinery is collected by the noise collection sensor. The signal collected by the noise collection sensor is weak and is filtered and amplified by the signal processor. The analog signal output by the signal processor is subjected to high-speed AD conversion by the digital collection card to convert the analog signal of the noise into a digital signal and enter the main control device.

[0007] The main control device includes a CPU processing module, through which wavelet analysis is performed on the noise digital signal. The CPU processing module is configured with a power supply module and a crystal oscillator module for normal operation of the CPU processing module. The CPU processing module converts the Ethernet port of the digital acquisition card into a UART serial TTL interface for communication through the network serial port chip CH9121. The CPU processing module communicates with the WiFi communication module through the UART serial TTL interface, and the WiFi communication module sends the control instructions of the main control device to the sound wave generating device through the WiFi network.

[0008] The sound wave generating device includes a Nor282 signal conditioning module and a Nor283 dodecahedron speaker. The main control device sends a sound wave instruction to the Nor282 signal conditioning module via a WiFi network. The Nor282 signal conditioning module processes the sound wave instruction and transmits it to the Nor283 dodecahedron speaker via an XLR connecting line to generate sound waves. The sound wave range generated by the Nor283 dodecahedron speaker is 0 to 120 dB, covering the noise range generated by large construction machinery in power transmission and transformation projects.

[0009] The shell is in a cone shape, which is conducive to the collection of noise and the propagation of adaptive sound, thereby more effectively reducing or controlling noise.

[0010] The beneficial effects of the present invention are:

[0011] 1) It can collect the environmental noise of the power transmission and transformation project site in real time, perform wavelet analysis and sound control on the environmental noise through the main control device, and use the sound wave generator to generate sound waves with the same amplitude and opposite phase as the environmental noise to offset it, thereby improving the construction environment, protecting the health of workers and improving the quality of the project.

[0012] 2) The shell is conical in shape, which is conducive to the collection of noise and the propagation of adaptive sound, thereby reducing or controlling noise more effectively.

[0013] 3) It is more flexible to use. In a small environment, a single device can be used for offsetting. Outdoors or when the construction area is large, a matrix arrangement can be used to limit the outward propagation of noise and reduce the impact of noise on the surrounding environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Attached Figure 1It is a structural schematic diagram of an environmental noise adaptive cancellation device of the present invention.

[0015] Attached Figure 2 It is a schematic diagram of the internal structure of a shell of an environmental noise adaptive cancellation device of the present invention.

[0016] Attached Figure 3 The present invention discloses a working flow diagram of a noise sensing device in an environmental noise adaptive cancellation device.

[0017] Attached Figure 4 The present invention is a circuit diagram of the main control device in an environmental noise adaptive cancellation device.

[0018] Attached Figure 5 The present invention is a working flow chart of an environmental noise adaptive cancellation device.

[0019] In the figure: 1. Shell; 2. Through hole; 3. Bottom plate; 4. Main control device; 5. Support platform; 6. Bracket; 7. Noise sensing device; 8. Sound wave generating device. DETAILED DESCRIPTION

[0020] The following is combined with Figure 1-5 , the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0022] An environmental noise adaptive cancellation device comprises a shell 1, a base plate 3, a main control device 4, a noise sensing device 7, and a sound wave generating device 8. The shell 1 is installed above the base plate 3. A plurality of through holes 2 are evenly opened in the circumferential direction and the top of the side wall of the shell 1. Noise is collected and propagated through the through holes 2. A plurality of brackets 6 are installed in the circumferential direction inside the shell 1 and on the base plate 3. A support platform 5 is installed in the middle of the base plate 3. The bracket 6 is installed on the support platform 5. The noise sensing device 7 and the sound wave generating device 8 are both installed on the bracket 6. The noise sensing device 7 is located on one side of the sound wave generating device 8. The main control device 4 is installed on the base plate 3. The input end of the main control device 4 is electrically connected to the noise sensing device 7, and the output end is electrically connected to the sound wave generating device 8.

[0023] The noise sensing device 7 includes a noise collection sensor, a signal processor and a digital collection board. The noise of large construction machinery is collected by the noise collection sensor. The signal collected by the noise collection sensor is weak and is filtered and amplified by the signal processor. The analog signal output by the signal processor is subjected to high-speed AD conversion by the digital collection card to convert the analog signal of the noise into a digital signal and enter the main control device 4.

[0024] The noise collection sensor is selected according to the noise range of common large-scale construction machinery. The noise range of common large-scale construction machinery at the construction site of power transmission and transformation projects is statistically analyzed. The noise level of large-scale construction machinery is between 70dB and 105dB. According to the noise level range of large-scale construction machinery, the noise collection sensor model is AWA14404. This sensor is engineering measurement level 1, with a frequency range of 10Hz to 20000Hz, a dynamic range of 24 to 160dB, a polarization voltage of 200V, and a pre-polarization test capacitor microphone. Since no additional polarization voltage is required, the circuit is simple and meets the noise collection needs during the construction of large-scale machinery in power transmission and transformation projects.

[0025] The signal processor uses an ATA-5210 pre-micro signal amplifier to amplify the signal output by the noise collection sensor. The amplifier bandwidth is 1kHz~5MHz, and the voltage increase is 46dB. The digital acquisition card uses a NET8544 data acquisition card. The NET8544 data acquisition card is a high-speed data acquisition card based on Ethernet. The acquisition rate is 40MS / s, and it has 14-bit 2-way synchronous analog input, accumulation function, and DIO function. It can perform high-precision acquisition of the noise collection sensor. The digital acquisition card transmits the noise digital signal to the main control device 4 via Ethernet.

[0026] The main control device 4 includes a CPU processing module, which adopts a TMS320F28379 main control chip with a main frequency of 200MHz, a dual-core 32-bit CPU, a relatively small memory of 1MB, four analog-to-digital converters, and three 12-bit buffered DAC outputs. The CPU processing module performs wavelet analysis on the noise digital signal. The CPU processing module is configured with a power supply module and a crystal oscillator module for the normal operation of the CPU processing module. The CPU processing module converts the Ethernet port of the digital acquisition card into a UART serial TTL interface for communication through the network serial port chip CH9121. The CPU processing module communicates with the WiFi communication module through the UART serial TTL interface. The WiFi communication module sends the control instruction of the main control device to the sound wave generating device 8 through the WiFi network. The main control device 4 performs wavelet analysis on the noise digital signal, and outputs the signal to the sound wave generating device 8 through the WiFi communication interface.

[0027] The wavelet transform formula is as follows:

[0028]

[0029] Among them, a is called the scale factor, and a>0, which is used to scale the basic wavelet ψ(t) function; τ is called the translation factor, which controls the translation of the wavelet function, and its value can be positive or negative. Both a and τ are continuous variables, also known as continuous wavelet transform. The continuous wavelet transform analysis obtains the amplitude of the sound wave at different times. The steps of continuous wavelet transform of sound waveform are as follows:

[0030] Step 1: Select the wavelet basis function, fix the scale factor a, and compare the wavelet basis function with the initial segment of the acoustic signal;

[0031] Step 2: Calculate the wavelet coefficients using the continuous wavelet transform calculation formula;

[0032] Step 3: Change the translation factor τ to shift the wavelet basis function along the time axis. Repeat steps 1 and 2 to complete an analysis.

[0033] Step 4: Increase the scale factor a and repeat steps 1, 2, and 3 to complete the second analysis.

[0034] Step 5: Repeat steps 1 to 4 until the analysis requirements are met.

[0035] The sound wave generating device includes a Nor282 signal conditioning module and a Nor283 dodecahedron speaker. The main control device sends a sound wave instruction to the Nor282 signal conditioning module via a WiFi network. The Nor282 signal conditioning module processes the sound wave instruction and transmits it to the Nor283 dodecahedron speaker via an XLR connecting line to generate sound waves. The sound wave range generated by the Nor283 dodecahedron speaker is 0 to 120 dB, covering the noise range generated by large construction machinery in power transmission and transformation projects.

[0036] The shell 1 is in a cone shape, which is conducive to the collection of noise and the propagation of adaptive sound, thereby more effectively reducing or controlling noise.

[0037] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. An environmental noise adaptive cancellation device, characterized in that: It includes a shell, a base plate, a main control device, a noise sensing device, and a sound wave generating device. The shell is installed above the base plate. A plurality of through holes are evenly opened in the circumferential direction of the side wall and the top of the shell. Noise is collected and transmitted through the through holes. A bracket is installed inside the shell and on the base plate. A support platform is installed in the middle of the base plate. A bracket is installed on the support platform. The noise sensing device and the sound wave generating device are both installed on the bracket. The main control device is installed on the base plate. The main control device is electrically connected to the noise sensing device and the sound wave generating device.

2. The environmental noise adaptive cancellation device according to claim 1, characterized in that: The noise sensing device includes a noise collection sensor, a signal processor and a digital collection board. The noise of large construction machinery is collected by the noise collection sensor. The signal collected by the noise collection sensor is weak and is filtered and amplified by the signal processor. The analog signal output by the signal processor is subjected to high-speed AD conversion by the digital collection card to convert the analog signal of the noise into a digital signal and enter the main control device.

3. The environmental noise adaptive cancellation device according to claim 1, characterized in that: The main control device includes a CPU processing module, through which wavelet analysis is performed on the noise digital signal. The CPU processing module is configured with a power supply module and a crystal oscillator module for normal operation of the CPU processing module. The CPU processing module converts the Ethernet port of the digital acquisition card into a UART serial TTL interface for communication through the network serial port chip CH9121. The CPU processing module communicates with the WiFi communication module through the UART serial TTL interface, and the WiFi communication module sends the control instructions of the main control device to the sound wave generating device through the WiFi network.

4. The environmental noise adaptive cancellation device according to claim 1, characterized in that: The sound wave generating device includes a Nor282 signal conditioning module and a Nor283 dodecahedron speaker. The main control device sends a sound wave instruction to the Nor282 signal conditioning module via a WiFi network. The Nor282 signal conditioning module processes the sound wave instruction and transmits it to the Nor283 dodecahedron speaker via an XLR connecting line to generate sound waves. The sound wave range generated by the Nor283 dodecahedron speaker is 0 to 120 dB, covering the noise range generated by large construction machinery in power transmission and transformation projects.

5. The environmental noise adaptive cancellation device according to claim 1, characterized in that: The shell is in a cone shape.

6. The environmental noise adaptive cancellation device according to claim 1, characterized in that: The number of the brackets is multiple and they are evenly installed along the circumferential direction of the bottom plate.

7. The environmental noise adaptive cancellation device according to claim 1, characterized in that: The input end of the main control device is electrically connected to the noise sensing device, and the output end is electrically connected to the sound wave generating device.

8. The environmental noise adaptive cancellation device according to claim 1, characterized in that: The noise sensing device is located on one side of the sound wave generating device.

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