Simulation modeling-based chemical industry park noise processing method
By establishing a simulation model in the chemical park and applying the boundary meta -method method, the complexity of the noise problem and the low efficiency of the noise of the chemical park are solved, and the accuracy of the noise prediction and the effectiveness of the noise reduction measures are achieved.
Patent Information
- Application Number
- CN202411281841.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-13
- Publication Date
- 2025-01-28
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
The noise problem in chemical parks is complex and difficult to effectively solve. The prior art is inefficient and difficult to obtain accurate solutions when solving the infinite space acoustic region and far-field acoustic radiation problems.
Using a method based on simulation modeling, the noise source characteristics are obtained through on -site testing, and the workshop simulation models in Virtual Lab and Comsol are established to use the boundary meta -method method to solve the problem of far field sound radiation, and use model verification and optimization to propose noise reduction measures.
A significant reduction of the error of the simulation model, improving the accuracy and efficiency of noise prediction, providing effective noise reduction measures, and improving labor conditions and public health.
Smart Images
Figure SMS_1 
Figure SMS_2
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of noise simulation modeling, and more specifically to a noise treatment method for a chemical park based on simulation modeling. Background Art
[0002] At present, strong noise is generated during production and operation in chemical parks. The noise problem seriously affects the physical and mental health of workshop workers and causes uninterrupted sound pollution to the surrounding sound environment. In addition, the relevant noise does not meet the national environmental assessment standards. This will not only damage the physical and mental health of the staff in the station, but also have a serious impact on the lives of surrounding residents. There are many noise source equipment in chemical plants, such as various fans, condensers, gas pipelines, air compressors, cooling towers, water pumps, etc. The noise types cover high, medium and low frequency noise, air noise, aerodynamic noise, vibration noise, and the noises interfere with each other, which is complicated. The highest noise value can reach more than 100 decibels. Therefore, it is necessary to study and control the sound field inside and outside the chemical park, establish a simulation model to calculate the noise distribution inside and outside each workshop in the chemical park, and compare and verify it with the measured value to determine the noise distribution inside and outside each workshop in the chemical park, as well as the suggestions for noise control measures. Due to the complexity of the sound field area, the boundary geometry and its internal unevenness, solving the distance-related sound field is a complex problem. The sound radiation problem is generally described by the fixed solution equation formed by the Helmholtz equation under boundary conditions.
[0003] In 1877, British physicist Rayleigh published "Principles of Acoustics", in which he proposed the Rayleigh integral model based on Huygens' principle. This model can be used to obtain exact solutions and calculate various types of sound field radiation. It is a classic method for solving sound radiation fields. Compared with the numerical calculation methods such as finite element and boundary element proposed later, Rayleigh integral saves the trouble of simultaneous large number of equations, but in many cases, Rayleigh integral cannot be expressed analytically, and because of the complexity of the integral process, the calculation time is too long, especially the efficiency is low in solving relatively complex double integrals. For this reason, people have proposed hypotheses and derived many effective calculation methods. For example, with the help of special functions, series approximation and other methods, the Ritz method or Galerkin method or the difference method discretization is used to obtain approximate solutions such as numerical solutions.
[0004] Later, as the finite element theory matured, people began to use the finite element method to calculate the sound field. The more flexible boundary element method was introduced into the sound field calculation. Maidanik et al. first applied the statistical energy method to the sound field calculation. Lyon et al.
[47] developed the statistical energy method based on it, and more scientists studied the statistical energy method. With the rapid development of computers, sound field analysis is more and more carried out with the help of computers, which greatly improves the efficiency and accuracy of calculation. However, since the radiation field grid area cannot be expanded infinitely, the finite element method cannot solve the far-field radiation problem in semi-enclosed space. Summary of the invention
[0005] The technical problem to be solved by the present invention is to provide a chemical park noise treatment method based on simulation modeling, to reduce the acoustic area of infinite space, to apply acoustic boundary conditions on the acoustic radiation boundary, and to solve the far-field acoustic radiation problem using the boundary element method according to the acoustic information on the radiation boundary.
[0006] In order to solve the above technical problems, the technical solutions adopted by the present invention are as follows.
[0007] A noise treatment method for a chemical park based on simulation modeling includes the following steps:
[0008] A. Obtain the sound source characteristics of each noise source in the workshop through on-site testing;
[0009] B. Establish a preliminary workshop simulation model in Virtual Lab, input the corresponding material parameters and sound source parameters, predict and generate the sound field distribution inside and outside the workshop, and check and correct the simulation model based on the measured sound field distribution cloud map inside the workshop. Establish a workshop simulation model in COMSOL with the same steps, generate the corresponding cloud map and compare it with the simulation model formed by Virtual Lab to verify its accuracy.
[0010] C. Obtain accurate workshop sound field simulation model and sound field distribution characteristics, and propose factory boundary recommendations and noise reduction measures for corresponding noise models.
[0011] To further optimize the technical solution, in step A, the sound source characteristic test includes noise spectrum characteristic analysis, and the spectrum characteristic analysis of the noise of the workshop and its related equipment is performed to understand the distribution of its noise in each frequency band;
[0012] The distribution of the workshop sound field is tested by setting noise measurement points in the workshop interior space according to the on-site inspection and drawing data;
[0013] Workshop sound source calculation: For the measurement of workshop noise, it is necessary to consider the interference of other noise sources besides the workshop noise, and the noise level needs to be added or subtracted to obtain accurate measurement results.
[0014] To further optimize the technical solution, in step B, the establishment of the Virtual Lab simulation model includes the establishment of a workshop geometry model, finite element meshing of the model, setting of acoustic boundary conditions, sound wave attenuation analysis, model accuracy verification, and acoustic-vibration coupling verification.
[0015] To further optimize the technical solution, in step B, the COMSOL model establishment includes workshop geometry model establishment, meshing, acoustic boundary condition setting, sound field distribution verification, and sound field distribution map comparison.
[0016] To further optimize the technical solution, in step B, the verification of the simulation model is to extract the corresponding external field measurement point data from the workshop simulation model, draw a corresponding sound field distribution simulation diagram in Origin, and compare and correct it according to the corresponding measured data to verify the accuracy of the model.
[0017] To further optimize the technical solution, in step C, the noise reduction measures are studied by establishing a sound insulation cover simulation model in Virtual Lab, observing the sound insulation simulation inside the workshop, establishing a sound absorption ceiling simulation model in COMSOL, observing the noise attenuation outside the workshop, and simulating the sound field cloud map inside the workshop by measuring the model. According to the simulation results, measures are set to effectively reduce the propagation of workshop noise.
[0018] To further optimize the technical solution, in step C, the noise reduction measures include noise reduction of the noise body, setting up sound barriers and installing vibration isolation platforms.
[0019] To further optimize the technical solution, the setting up of the sound barrier includes installing a sound insulation cover and setting up a sound absorbing barrier.
[0020] Due to the adoption of the above technical scheme, the technical progress achieved by the present invention is as follows.
[0021] The present invention provides a chemical park noise treatment method based on simulation modeling. Compared with the acoustic simulation software based on mathematical empirical formulas, the simulation model error established in Virtual Lab and COMSOL is greatly reduced, which has obvious advantages, meets the actual needs of workshop simulation technology research and provides certain theoretical guidance and technical support for future workshop noise prediction work. According to the actual situation of the workshop, corresponding noise reduction measures are proposed, which can effectively reduce the propagation of workshop noise.
[0022] The noise control scheme provided in the present invention can effectively improve working conditions and working environment, reduce the occurrence of occupational diseases, significantly reduce the relevant costs caused by occupational disease hazards, and can reduce and eliminate noise emissions, protect public health, and have good social benefits. DETAILED DESCRIPTION
[0023] The present invention will be further described in detail below with reference to specific embodiments.
[0024] A noise treatment method for a chemical park based on simulation modeling includes the following steps:
[0025] A. Obtain the sound source characteristics of each noise source in the workshop through on-site testing.
[0026] Through on-site inspections of the park workshops and point tests of the selected workshops using the sound pressure method, the relevant test data was analyzed, and their distribution characteristics were obtained and an accurate workshop sound field was constructed, providing a basis for the subsequent optimization of the workshop simulation model.
[0027] The sound source characteristic test includes noise spectrum characteristic analysis, workshop sound field distribution and workshop sound source calculation.
[0028] Noise spectrum characteristic analysis is to analyze the spectrum characteristics of the workshop and its related equipment noise to understand the distribution of its noise in each frequency band.
[0029] The workshop sound field distribution is tested by setting noise measurement points in the internal space of the workshop based on the on-site investigation and drawing data.
[0030] For the measurement of workshop noise, it is necessary to consider the interference of other noise sources besides the workshop noise, and to add or subtract the noise level to obtain accurate measurement results.
[0031] If the sound pressures generated by several sound sources at a certain point are respectively p 1 、p 2 、p 3 ...p n , the corresponding sound pressure levels are L p1 , L p2 , L p3 ...L pn The total sound pressure level is L pt for:
[0032]
[0033] In order to improve the accuracy of workshop measurement and reduce errors, it is necessary to measure at multiple measuring points with the same distance and calculate their average value. The specific method is as follows:
[0034]
[0035] B. Establish a preliminary workshop simulation model in Virtual Lab, input the corresponding material parameters and sound source parameters, predict and generate the sound field distribution inside and outside the workshop, and check and correct the simulation model based on the measured sound field distribution cloud map inside the workshop. Establish a workshop simulation model in COMSOL with the same steps, generate the corresponding cloud map and compare it with the simulation model formed by Virtual Lab to verify its accuracy.
[0036] The establishment of Virtual Lab simulation model includes the establishment of workshop geometry model, model finite element meshing, acoustic boundary condition setting, sound wave attenuation analysis, model accuracy verification and acoustic-vibration coupling verification.
[0037] The geometric model of the workshop is established by using the geometric modeling module in Virtual Lab to construct a model of the park test workshop, and reflect the corresponding exits in the model according to the actual situation on site.
[0038] The finite element meshing of the model is carried out in the CAD Meshing module of the CATIA platform integrated in the Virtual Lab software. Since the quality of the mesh after the discretization of the structure directly affects the accuracy of the solution, fine meshing is very important. The workshop structure model is meshed according to the requirements of the acoustic mesh calculation, with a mesh unit size of 0.01cm. Further, the material of the built workshop acoustic finite element model is defined, the wall material is defined as reinforced concrete, the fluid domain is defined as the atmosphere, and the ground is a fixed boundary. The rest are free boundary conditions. Referring to ISO9613-2:1996, the ground is set to rigid, and a layer of acoustic envelope mesh is constructed outside the established workshop to facilitate the observation of the radiation of sound waves and the corresponding external field cloud map.
[0039] Acoustic boundary condition setting: The pump in the workshop is the main sound source, so an acoustic boundary condition is set in the model and a sound source is set in the pump room.
[0040] Sound wave attenuation analysis: For workshop noise, the attenuation of sound waves is mainly affected by two factors. The first is the increase in the distance from the sound source. As the distance increases, the noise level will naturally decay until it decays to the background noise level. The second is that the noise is blocked by obstacles during propagation, and the noise on the other side of the barrier will be attenuated to a greater extent.
[0041] In order to analyze the sound wave attenuation, the measurement points are selected in the workshop according to the distance from the point sound source to obtain the corresponding sound pressure. The accuracy of the simulation results is verified by whether the measured values of the corresponding measurement points and the distances between the corresponding measurement points conform to the law of sound wave attenuation.
[0042] Model accuracy verification is used to verify the accuracy of the workshop simulation model. A three-dimensional map of the sound field distribution is drawn for the workshop body. The three-dimensional map of the sound field distribution is helpful to analyze the corresponding sound field distribution of the workshop, and the corresponding sound field changes can be observed according to the cloud map, which provides a theoretical basis for subsequent processing and corresponding noise reduction measures. The measured data of workshop noise is selected and imported into Matlab for data analysis, and the corresponding distribution cloud map is drawn.
[0043] Acoustic-vibration coupling verification is the interaction between acoustics and structure. The coupling problem refers to the close interaction between structure and fluid, which has a significant impact on the acoustic properties. In engineering practice, the interaction between structure and fluid needs to be considered to obtain accurate results.
[0044] The COMSOL model establishment includes workshop geometry model establishment, meshing, acoustic boundary condition setting, sound field distribution verification, and sound field distribution map comparison.
[0045] The workshop geometry model is established by defining the workshop finite element model based on the workshop engineering drawings.
[0046] Meshing is the process of importing the workshop structure model into the COMSOL acoustic module to obtain the workshop acoustic finite element model.
[0047] Acoustic boundary condition setting: The circulating water pump is the main sound source, so an acoustic boundary condition is set in the model and a sound source is set in the pump room.
[0048] The sound field distribution verification is based on the COMSOL sound source simulation model to perform multi-physical field coupling numerical calculations to obtain the external sound field distribution. By visually analyzing the internal simulated sound field distribution, it is determined whether a reverberation field is formed in the workshop.
[0049] For the comparison of the sound field distribution map, first draw the sound field distribution cloud map outside the workshop, select the corresponding data of the workshop peripheral measurement points, and import the data into Matlab to calculate and generate the corresponding cloud map.
[0050] C. Obtain accurate workshop sound field simulation model and sound field distribution characteristics, and propose factory boundary recommendations and noise reduction measures for corresponding noise models.
[0051] The noise reduction measures are studied by establishing a soundproof cover simulation model in Virtual Lab, observing the sound insulation simulation inside the workshop, establishing a sound-absorbing ceiling simulation model in COMSOL, observing the noise attenuation outside the workshop, and simulating the sound field cloud map inside the workshop by measuring the model. According to the simulation results, measures are set to effectively reduce the propagation of workshop noise.
[0052] The research on noise reduction measures includes noise reduction of the noise itself, setting up sound barriers and installing vibration isolation platforms.
[0053] Noise reduction is achieved by installing silencers and wrapping pipes to reduce vibration, thereby reducing noise generation, which can reduce the harm of noise to workshop workers.
[0054] The establishment of a sound barrier includes installing a soundproof cover and setting up a sound-absorbing barrier. The soundproof cover includes a damping layer and a sound-absorbing layer. By placing the sound source in it, the purpose of noise control is achieved. The establishment of a sound-absorbing barrier is to install a full metal sound-absorbing barrier on the external wall of the workshop, and to install a sound-absorbing ceiling on the top of the workshop using materials such as mineral wool sound-absorbing panels, polyester fiber sound-absorbing cotton, and wood wool sound-absorbing panels, which can effectively reduce the spread of noise.
[0055] Installing a vibration isolation table means installing a vibration isolation table at the bottom of the vibration equipment, and adjusting the output of the secondary vibration source through a certain control method so that the vibration generated by it offsets the vibration of the main vibration source (interference), thereby achieving the purpose of vibration isolation.
[0056] The present invention uses acoustic finite element and boundary element methods, establishes corresponding workshop acoustic simulation models in Virtual Lab and COMSOL, simulates the sound field distribution inside and outside the workshop, and analyzes the sound pressure distribution inside and outside the workshop according to the model simulation calculation results, and obtains the distribution of the corresponding sound field cloud map. Corresponding measuring points are selected, and the measured data of each measuring point is compared with the simulation data for attenuation. The average error is less than 5dB, indicating that the simulation and measured results have good consistency.
Claims
1. A noise treatment method for a chemical park based on simulation modeling, characterized in that: It includes the following steps: A. Obtain the sound source characteristics of each noise source in the workshop through on-site testing; B. Establish a preliminary workshop simulation model in Virtual Lab, input the corresponding material parameters and sound source parameters, predict and generate the sound field distribution inside and outside the workshop, and check and correct the simulation model based on the measured sound field distribution cloud map inside the workshop. Establish a workshop simulation model in COMSOL with the same steps, generate the corresponding cloud map and compare it with the simulation model formed by Virtual Lab to verify its accuracy. C. Obtain accurate workshop sound field simulation model and sound field distribution characteristics, and propose factory boundary recommendations and noise reduction measures for corresponding noise models.
2. A noise treatment method for a chemical park based on simulation modeling according to claim 1, characterized in that: In step A, the sound source characteristic test includes noise spectrum characteristic analysis, and the spectrum characteristic analysis of the noise of the workshop and its related equipment is performed to understand the distribution of the noise in each frequency band; The distribution of the workshop sound field is tested by setting noise measurement points in the workshop interior space according to the on-site inspection and drawing data; Workshop sound source calculation: For the measurement of workshop noise, it is necessary to consider the interference of other noise sources besides the workshop noise, and the noise level needs to be added or subtracted to obtain accurate measurement results.
3. A noise treatment method for a chemical park based on simulation modeling according to claim 1, characterized in that: In step B, the establishment of the Virtual Lab simulation model includes the establishment of a workshop geometry model, the finite element meshing of the model, the setting of acoustic boundary conditions, the sound wave attenuation analysis, the model accuracy verification, and the acoustic-vibration coupling verification.
4. The noise treatment method for a chemical park based on simulation modeling according to claim 1 is characterized in that: In the step B, the COMSOL model establishment includes the establishment of a workshop geometry model, meshing, acoustic boundary condition setting, sound field distribution verification, and sound field distribution map comparison.
5. A noise treatment method for a chemical park based on simulation modeling according to claim 1, characterized in that: In step B, the simulation model is verified by extracting the corresponding field measurement point data from the workshop simulation model, drawing the corresponding sound field distribution simulation diagram in Origin, and performing comparison and correction based on the corresponding measured data to verify the accuracy of the model.
6. A noise treatment method for a chemical park based on simulation modeling according to claim 1, characterized in that: In step C, the noise reduction measures are studied by establishing a soundproof enclosure simulation model in Virtual Lab, observing the sound insulation simulation inside the workshop, establishing a sound-absorbing ceiling simulation model in COMSOL, observing the noise attenuation outside the workshop, and simulating the sound field cloud map inside the workshop by measuring the model. According to the simulation results, measures are set to effectively reduce the propagation of workshop noise.
7. A noise treatment method for a chemical park based on simulation modeling according to claim 1, characterized in that: In step C, the noise reduction measures include noise reduction of the noise body, setting up sound barriers and installing vibration isolation platforms.
8. A noise treatment method for a chemical park based on simulation modeling according to claim 7, characterized in that: The setting up of the sound barrier includes installing a soundproof cover and setting up a sound absorbing barrier.