CN113392601A - Geometric feature analysis method of hydrodynamic noise line spectrum of cylinder-like shell - Google Patents
Geometric feature analysis method of hydrodynamic noise line spectrum of cylinder-like shell Download PDFInfo
- Publication number
- CN113392601A CN113392601A CN202110782864.3A CN202110782864A CN113392601A CN 113392601 A CN113392601 A CN 113392601A CN 202110782864 A CN202110782864 A CN 202110782864A CN 113392601 A CN113392601 A CN 113392601A
- Authority
- CN
- China
- Prior art keywords
- shell
- line spectrum
- cylinder
- format
- hydrodynamic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000001228 spectrum Methods 0.000 title claims abstract description 22
- 238000004458 analytical method Methods 0.000 title claims abstract description 12
- 239000011257 shell material Substances 0.000 claims abstract description 44
- 230000004044 response Effects 0.000 claims abstract description 21
- 238000011084 recovery Methods 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 14
- 238000010586 diagram Methods 0.000 claims abstract description 7
- 230000010349 pulsation Effects 0.000 claims abstract description 5
- 238000006243 chemical reaction Methods 0.000 claims abstract description 4
- FKLFBQCQQYDUAM-UHFFFAOYSA-N fenpiclonil Chemical compound ClC1=CC=CC(C=2C(=CNC=2)C#N)=C1Cl FKLFBQCQQYDUAM-UHFFFAOYSA-N 0.000 claims abstract description 4
- 230000005855 radiation Effects 0.000 claims abstract description 4
- 238000004364 calculation method Methods 0.000 claims description 11
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- 238000000638 solvent extraction Methods 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001808 coupling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/28—Design optimisation, verification or simulation using fluid dynamics, e.g. using Navier-Stokes equations or computational fluid dynamics [CFD]
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/10—Noise analysis or noise optimisation
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Geometry (AREA)
- Evolutionary Computation (AREA)
- General Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Mathematical Analysis (AREA)
- Mathematical Optimization (AREA)
- Pure & Applied Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mathematical Physics (AREA)
- Computing Systems (AREA)
- Algebra (AREA)
- Computational Mathematics (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
The invention discloses a geometric characteristic analysis method of a hydrodynamic noise line spectrum of a cylinder-like shell, which comprises the following steps: partitioning the CFD mesh and the mesh of the shell finite element surface by using Gambit software; acquiring wall surface pressure pulsation data, namely a cgns format file; importing grids of the shell finite element surface divided by Gambit into ICEM for grid data format conversion; importing the grid format. bdf file into Nastran to carry out shell material attribute, and calculating a free mode to obtain a.op 2 format file; setting a numerical model of hydrodynamic radiation noise; setting a boundary layer type; and establishing a data recovery surface, arranging a sensor on the data recovery surface, and solving a sound pressure frequency response diagram at the position of the sensor. The characteristic analysis method of the method utilizes a numerical method to solve, and can obtain the relevance between the length size of the cylinder-like shell and the line spectrum frequency.
Description
Technical Field
The invention belongs to the technical field of signal processing, and particularly relates to a geometric characteristic analysis method of a hydrodynamic noise line spectrum of a cylinder-like shell.
Background
When the cylinder-like shell passes through a water medium, a turbulent boundary layer is formed on the surface of the cylinder-like shell, unstable flow is blocked by the surface of the shell, momentum fluctuation near the wall surface is balanced by pressure fluctuation on the interface, and the pressure fluctuation of the boundary layer is used as a random excitation source to be excited to form hydrodynamic noise. The hydrodynamic noise is caused by disturbance in a boundary layer of surrounding turbulence generated when the cylindrical shell passes through a water medium, pulsating pressure on a wall surface and structural vibration caused by coupling action of fluid and solid. In general, hydrodynamic noise is of a much lower magnitude than mechanical and propeller noise, but as the speed of motion increases, the proportion of hydrodynamic noise in the total noise increases.
At present, the numerical calculation method of hydrodynamic noise mainly comprises three methods, namely a theoretical analysis method, a numerical prediction method and an experimental method. The theoretical analysis method has a strict mathematical and physical derivation formula, but is only limited to a shell model with a simple geometric shape, the actual model needs to be simplified, and the theoretical method is limited when the actual engineering problem is processed.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the problems and the defects of the existing method, the invention provides the geometric characteristic analysis method of the hydrodynamic noise line spectrum of the cylindrical shell, the numerical prediction has certain adaptability to the hydrodynamic noise problem with complex structure and boundary, and the engineering practicability is strong.
The technical scheme is as follows: in order to achieve the purpose, the invention adopts the following technical scheme: a geometric characteristic analysis method of a hydrodynamic noise line spectrum of a cylinder-like shell comprises the following steps:
and 8, analyzing the hydrodynamic noise sound pressure frequency response line spectrum characteristics of the similar cylindrical shells with different length sizes, so as to obtain the relation between the length size of the similar cylindrical shell and the hydrodynamic noise sound pressure frequency response line spectrum.
Has the advantages that: compared with the prior art, the method has the following beneficial effects:
(1) the estimation method solves hydrodynamic noise in VA ONE software, quickly solves the relation between the length size of the similar cylindrical shell and the hydrodynamic noise line spectrum, and has strong engineering practicability;
(2) the estimation method can solve the problem of hydrodynamic noise line spectrum characteristic analysis with complex structure and boundary;
drawings
FIG. 1 is a schematic flow diagram of the process of the present invention;
FIG. 2 is a diagram of a numerical model of a cylinder-like shell;
FIG. 3 is a spatial distribution map of test points;
FIG. 4 is a graph of hydrodynamic noise sound pressure frequency response of a cylinder-like housing;
FIG. 5 is a graph of the acoustic pressure frequency response of hydrodynamic noise of cylindrical shells of different lengths;
FIG. 5(a) is a graph of the acoustic pressure frequency response of hydrodynamic noise at a cylinder-like housing length of 5 m;
FIG. 5(b) is a graph of the acoustic pressure frequency response of hydrodynamic noise at a cylinder-like housing length of 5.5 m;
FIG. 5(c) is a graph of the acoustic pressure frequency response of hydrodynamic noise at a cylinder-like housing length of 5.98533 m;
FIG. 5(d) is a graph of the acoustic pressure frequency response of hydrodynamic noise at a cylinder-like housing length of 6.5 m;
FIG. 5(e) is a graph of the acoustic pressure frequency response of hydrodynamic noise at a cylinder-like housing length of 7 m;
FIG. 5(f) is a graph of the acoustic pressure frequency response of hydrodynamic noise at a cylinder-like housing length of 7.5 m;
FIG. 5(g) is a graph of the acoustic pressure frequency response of hydrodynamic noise at a cylinder-like housing length of 7.8 m;
fig. 5(h) is a sound pressure frequency response graph of hydrodynamic noise at a cylinder-like housing length of 8.2 m.
Detailed Description
The invention is further described with reference to the following figures and examples:
as shown in fig. 1, the method for analyzing geometrical characteristics of hydrodynamic noise line spectrum of a cylindrical shell of the present invention includes the following steps:
(1) the size parameters of the cylinder-like shell are respectively set as: the thickness h of the cylinder-like shell is 0.027m, the radius r is 0.533m, the length L of the circular platform part at the front end is 0.2132m, the length L of the cylinder-like shell is 4.867883m, an experimental paddle T1 is used as a propeller, the diameter is 0.2482m, and four-blade large-side inclined paddles are arranged. Partitioning a CFD computational grid and a grid of a shell finite element surface by using Gambit software;
(2) performing steady-state flow field calculation in the Fluent, then performing unsteady-state flow field calculation, wherein the iteration step length of the unsteady-state calculation is 0.000462963s, the environmental pressure is 113kPa, the rotating speed is 30r/s, and wall surface pressure pulsation data is derived;
(3) importing grids of the shell finite element surface divided by Gambit into ICEM for grid data format conversion, and converting into bdf format;
(4) introducing the grid format bdf into Nastran for shell material property setting, wherein the shell material property is steel, and the density rho of the cylindrical shell isp7800kg/m3, the poisson ratio sigma is 0.3, the young modulus E is 2.1 × 1011, and a free mode file op2 format is obtained through calculation;
(5) importing a Nastran free steady state op2 format file and Fluent exported shell wall surface pressure fluctuating pressure data, and importing a cgns format file into VA ONE software to set a numerical model of hydrodynamic radiation noise;
(6) adding turbulent boundary layer load to the surface of finite element model of cylinder-like shell, sound velocity C in water01500m/s, sea water density ρ0Setting a turbulent boundary layer type as 1000kg/m 3;
(7) establishing a data recovery surface, setting the data recovery surface as a boundary meta-model, arranging sensors on the data recovery surface, establishing a spherical data recovery surface with the length of 2.5m by taking the center of a propeller as an original point, and arranging 8 sensors on the data recovery surface as a device for receiving hydrodynamic noise of a cylindrical shell of a hydrophone test type, wherein the numerical calculation model and the spatial distribution diagram of the test points are shown in fig. 2 and 3. With the above arrangement, the VA ONE software solves the sound pressure frequency response plot at the sensor location, as shown in fig. 4.
(8) And analyzing the sound pressure frequency response line spectrum characteristics of the hydrodynamic noise of the cylinder-like shells with different length and size.
Setting the length parameters of the cylinder-like shell to be 5m, 5.5m, 5.98533m, 6.5m, 7.0m, 7.5m, 7.8m and 8.2m respectively, obtaining the sound pressure frequency responses of the 8 sensor positions corresponding to the length parameters of the different cylinder-like shells according to the steps 1-7, finding the strongest line spectrum frequency in the sound pressure frequency response diagram of the different length parameters as shown in the figures 5(a) -5(h) in sequence, and as shown in the table 1, reducing the frequency of the corresponding line spectrum along with the increase of the length of the line spectrum.
TABLE 1 hydrodynamic noise line spectrum distribution corresponding to different cylinder shell lengths
Claims (4)
1. A geometric feature analysis method of a hydrodynamic noise line spectrum of a cylinder-like shell is characterized by comprising the following steps:
step 1, dividing CFD grids and grids on a shell finite element surface by using Gambit software;
step 2, performing unsteady calculation in Fluent to obtain wall surface pressure pulsation data, namely a cgns format file;
step 3, importing grids on the shell finite element surface divided by Gambit into ICEM for grid data format conversion, and converting into bdf format;
step 4, importing the grid data format of bdf into Nastran to set the shell material attribute, and calculating to obtain a free mode file of op2 format;
step 5, importing the free steady state of Nastran, op2 format file and the shell wall surface pressure fluctuating pressure data exported by Fluent into VA ONE software, and setting a numerical model of hydrodynamic radiation noise;
step 6, adding turbulent boundary layer load to the surface of the finite element model of the cylinder-like shell, and setting the type of the boundary layer;
step 7, establishing a data recovery surface, setting the data recovery surface as a boundary element model, arranging a sensor on the data recovery surface, and solving a hydrodynamic noise sound pressure frequency response diagram at the position of the sensor by adopting VA ONE software;
and 8, analyzing the hydrodynamic noise sound pressure frequency response line spectrum characteristics of the similar cylindrical shells with different length sizes, so as to obtain the relation between the length size of the similar cylindrical shell and the hydrodynamic noise sound pressure frequency response line spectrum.
2. The method for analyzing the geometric characteristics of the hydrodynamic noise line spectrum of the cylindrical shell according to claim 1, wherein in the step 2, steady-state flow field calculation is performed in Fluent, and then unsteady-state flow field calculation is performed to obtain wall surface pressure pulsation data.
3. The method for geometrical feature analysis of hydrodynamic noise line spectrum of cylindrical hull according to claim 1, wherein in step 4, the material property is set to steel.
4. The method of claim 1, wherein in step 7, the data recovery surface is a spherical data recovery surface centered on the propeller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110782864.3A CN113392601A (en) | 2021-07-12 | 2021-07-12 | Geometric feature analysis method of hydrodynamic noise line spectrum of cylinder-like shell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110782864.3A CN113392601A (en) | 2021-07-12 | 2021-07-12 | Geometric feature analysis method of hydrodynamic noise line spectrum of cylinder-like shell |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113392601A true CN113392601A (en) | 2021-09-14 |
Family
ID=77625751
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110782864.3A Pending CN113392601A (en) | 2021-07-12 | 2021-07-12 | Geometric feature analysis method of hydrodynamic noise line spectrum of cylinder-like shell |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113392601A (en) |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103530482A (en) * | 2013-11-04 | 2014-01-22 | 东南大学 | Method for forecasting noise value of propeller in uneven inflow |
| CN103632000A (en) * | 2013-11-25 | 2014-03-12 | 中国船舶重工集团公司第七〇五研究所 | Finite element modeling method of underwater vehicle wedge ring structure |
| CN103631994A (en) * | 2013-11-18 | 2014-03-12 | 代元军 | Method for predicting acoustic radiation rule value of noise of wind turbine |
| CN104091085A (en) * | 2014-07-18 | 2014-10-08 | 安徽工业大学 | Cavitation noise feature estimation method based on propeller wake flow pressure fluctuation computing |
| CN104834763A (en) * | 2014-10-31 | 2015-08-12 | 北汽福田汽车股份有限公司 | Method for obtaining engine radiation noise and engine design optimization method |
| CN107066761A (en) * | 2017-05-16 | 2017-08-18 | 沈阳航空航天大学 | A kind of electric airplane propeller noise computational methods |
| CN107273570A (en) * | 2017-05-10 | 2017-10-20 | 江苏大学 | A kind of blade pump cavitation Inductive noise Numerical Prediction Method |
| CN109271674A (en) * | 2018-08-23 | 2019-01-25 | 华南理工大学 | A kind of punching press metal plate reinforcing rib sound insulation property emulated computation method |
| CN109753681A (en) * | 2018-11-28 | 2019-05-14 | 中国船舶重工集团公司第七一九研究所 | A kind of underwater Comprehensive prediction method for flowing sharp cavity line spectrum noise |
| CN110929457A (en) * | 2019-11-15 | 2020-03-27 | 东南大学 | Numerical prediction method for dipole source noise of travelling crane with water surface |
| US20200410147A1 (en) * | 2019-06-28 | 2020-12-31 | Viettel Group | Aerodynamic derivatives calculation method for flight vehicle |
| CN112559966A (en) * | 2020-12-02 | 2021-03-26 | 东南大学 | Vibration radiation characteristic analysis method for underwater finite-length cylindrical shell |
-
2021
- 2021-07-12 CN CN202110782864.3A patent/CN113392601A/en active Pending
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103530482A (en) * | 2013-11-04 | 2014-01-22 | 东南大学 | Method for forecasting noise value of propeller in uneven inflow |
| CN103631994A (en) * | 2013-11-18 | 2014-03-12 | 代元军 | Method for predicting acoustic radiation rule value of noise of wind turbine |
| CN103632000A (en) * | 2013-11-25 | 2014-03-12 | 中国船舶重工集团公司第七〇五研究所 | Finite element modeling method of underwater vehicle wedge ring structure |
| CN104091085A (en) * | 2014-07-18 | 2014-10-08 | 安徽工业大学 | Cavitation noise feature estimation method based on propeller wake flow pressure fluctuation computing |
| CN104834763A (en) * | 2014-10-31 | 2015-08-12 | 北汽福田汽车股份有限公司 | Method for obtaining engine radiation noise and engine design optimization method |
| CN107273570A (en) * | 2017-05-10 | 2017-10-20 | 江苏大学 | A kind of blade pump cavitation Inductive noise Numerical Prediction Method |
| CN107066761A (en) * | 2017-05-16 | 2017-08-18 | 沈阳航空航天大学 | A kind of electric airplane propeller noise computational methods |
| CN109271674A (en) * | 2018-08-23 | 2019-01-25 | 华南理工大学 | A kind of punching press metal plate reinforcing rib sound insulation property emulated computation method |
| CN109753681A (en) * | 2018-11-28 | 2019-05-14 | 中国船舶重工集团公司第七一九研究所 | A kind of underwater Comprehensive prediction method for flowing sharp cavity line spectrum noise |
| US20200410147A1 (en) * | 2019-06-28 | 2020-12-31 | Viettel Group | Aerodynamic derivatives calculation method for flight vehicle |
| CN110929457A (en) * | 2019-11-15 | 2020-03-27 | 东南大学 | Numerical prediction method for dipole source noise of travelling crane with water surface |
| CN112559966A (en) * | 2020-12-02 | 2021-03-26 | 东南大学 | Vibration radiation characteristic analysis method for underwater finite-length cylindrical shell |
Non-Patent Citations (6)
| Title |
|---|
| 吕世金，等: "水下航行体水动力辐射噪声预报方法研究", 水动力学研究与进展A辑, vol. 22, no. 4, 15 July 2007 (2007-07-15), pages 475 - 482 * |
| 张应迁，等: "基于ANSYS的FLUENT前处理", 机械工程师, no. 06, 10 June 2012 (2012-06-10), pages 51 - 52 * |
| 彭华康，等: ":湍流脉动压力下椭球声呐腔水动力自噪声分析", 中国舰船研究, vol. 6, no. 4, 31 August 2011 (2011-08-31), pages 27 - 42 * |
| 潘杰: "潮湿路表条件下轮胎噪声的模拟方法", 工业工程设计, no. 6, 31 December 2020 (2020-12-31), pages 144 - 145 * |
| 许兆庆，等: "扇式折叠翼巡飞导弹结构与气动数值计算", 计算机仿真, vol. 28, no. 12, 15 December 2011 (2011-12-15), pages 24 - 25 * |
| 陈美霞，等: "湍流激励下结构振动特性的半解析半数值算法研究", 振动工程学报, vol. 24, no. 6, 15 December 2011 (2011-12-15), pages 689 - 695 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108319793B (en) | CFD-based analysis method for free movement of low-speed inclined water inlet | |
| CN104298869B (en) | A kind of fluid structurecoupling Numerical prediction method of elastic hydrofoil | |
| CN109657262B (en) | Ship free field underwater acoustic radiation far field criterion method | |
| CN116090303B (en) | Risk assessment method, device and equipment for scouring state of offshore pile foundation | |
| CN109827734A (en) | A kind of method that outflow acts on lower deep sea vertical pipe vortex-induced vibration in assessment | |
| CN101271155A (en) | Method for detecting and judging objective by epeiric sea low frequency coherent vector sound field interference structure | |
| CN112464585B (en) | Ducted propeller calculation method based on viscous flow and potential flow coupling | |
| CN113092065B (en) | Analysis method for calculation of hydrodynamic characteristics of submerged net cage | |
| CN106886666B (en) | Boundary layer grid solving method for lift-drag ratio of underwater glider under different attack angles | |
| CN110929457A (en) | Numerical prediction method for dipole source noise of travelling crane with water surface | |
| Furuyama et al. | A numerical simulation of a tidal bore flow | |
| CN112182983A (en) | Floating body water elasticity response analysis method considering influence of submarine topography and waves | |
| CN113111608A (en) | Novel local turbulence pulsation generation method | |
| Huang et al. | Air-entrained vortex in open intake: Time–frequency analysis and the interaction with subsurface vortices | |
| Aarnes et al. | Treatment of solid objects in the Pencil Code using an immersed boundary method and overset grids | |
| CN113392601A (en) | Geometric feature analysis method of hydrodynamic noise line spectrum of cylinder-like shell | |
| CN113139306A (en) | Numerical prediction method for cavitation noise of composite propeller | |
| Li et al. | Loading noise induced by cavitating flow and its simplified model prediction | |
| CN112559966A (en) | Vibration radiation characteristic analysis method for underwater finite-length cylindrical shell | |
| HUANG et al. | Numerical simulation of the tidal bore in the Qiantang River based on Boussinesq-type equations | |
| Dong et al. | Simplified calculation method for hydrodynamic noise of multi-tube heat exchanger based on acoustic cavity model | |
| Zhang et al. | Analysis of the dynamic system of wave glider with a towed body | |
| Kao | An improved numerical computation of hull pressure fluctuations due to unsteady sheet cavitation of a propeller | |
| Fang et al. | 3D numerical investigation of distorted scale in hydraulic physical model experiments | |
| Guo et al. | Numerical research on hydrodynamic characteristics of the disk-shaped autonomous underwater vehicle near free surface |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |