CN111241734A - Vibration noise numerical simulation method for piston engine - Google Patents
Vibration noise numerical simulation method for piston engine Download PDFInfo
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- CN111241734A CN111241734A CN202010021578.0A CN202010021578A CN111241734A CN 111241734 A CN111241734 A CN 111241734A CN 202010021578 A CN202010021578 A CN 202010021578A CN 111241734 A CN111241734 A CN 111241734A
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Abstract
The invention relates to a vibration noise numerical simulation method for a piston engine, which comprises the following steps: establishing a three-dimensional entity simulation model and a finite element model thereof for a plate-type structure on the surface of the piston engine, and carrying out vibration modal analysis on the plate-type structure on the three-dimensional entity simulation model to obtain a surface modal result set and a surface node coordinate file of the plate-type structure; combining a finite element model to carry out multi-body dynamics analysis on the three-dimensional entity simulation model to obtain a plurality of different excitation forces of the piston engine; applying different excitation forces to the plate-type structure of the three-dimensional entity simulation model, and calculating by using a modal superposition principle to obtain a dynamic response result of the plate-type structure under different excitation forces; solving the frequency range requirement of the acoustic physical quantity according to the acoustic boundary element model, and coarsening the finite element model to obtain an envelope surface grid and a node coordinate file; and giving the dynamic response result to the boundary element grid nodes of the node coordinate file, and calculating to obtain the acoustic physical quantity of the plate-type structure acoustic radiation.
Description
Technical Field
The invention relates to the technical field of industrial simulation, in particular to the field of engine structure vibration noise simulation, and specifically relates to a vibration noise numerical simulation method for a piston engine.
Background
At present, a great deal of research is conducted by many experts and scholars at home and abroad from different angles in the aspect of the structural noise radiation of the engine. The method mainly comprises the following parts: first, the mechanism of acoustic radiation was studied. The most distinctive research effort is to reveal the essential characteristics of acoustic radiation by theoretical reconstruction of the acoustic field. Solving the radiation sound field characteristics of structural vibration excitation through a linear expansion form of a group of basis functions as Bouchet research; second, acoustic radiation prediction methods were studied. Gerard utilizes an acoustic transmission vector technology to solve acoustic parameters of an external field of the internal combustion engine, and pioneering research work is carried out on the aspect of a technology for solving a radiation sound field of an internal combustion engine structure; third, acoustic radiation modal studies.
Researchers have combined finite element and boundary element methods to study structural sound radiation of internal combustion engines and study vibration radiation of single-cylinder gasoline engines. However, because of the complex structure of the piston engine, few people carry out the whole integrated noise simulation research on the piston engine, including the main bearing, the connecting rod mechanism and the like.
At present, a scholars combines multi-body dynamics and a finite element method to simulate the vibration and noise of an internal combustion engine, but the time consumption is huge, and the method is not suitable for engineering application.
Disclosure of Invention
Aiming at the problems and the defects in the prior art, the invention provides a vibration noise numerical simulation method for a piston engine, which is used for analyzing the coupled vibration and noise of the piston engine.
The invention solves the technical problems through the following technical scheme:
the invention provides a vibration noise numerical simulation method for a piston engine, which is characterized by comprising the following steps of:
s1, establishing a three-dimensional solid simulation model and a finite element model thereof for the plate-type structure of the surface of the piston engine, and carrying out vibration mode analysis of the plate-type structure on the three-dimensional solid simulation model to obtain a surface mode result set and a surface node coordinate file of the plate-type structure;
s2, performing multi-body dynamics analysis on the three-dimensional entity simulation model by combining the finite element model to obtain a plurality of different excitation forces of the piston engine;
s3, applying different excitation forces to the plate-type structure of the three-dimensional entity simulation model, and calculating to obtain a dynamic response result of the plate-type structure under different excitation forces by using a modal superposition principle;
s4, solving the frequency range requirement of the acoustic physical quantity according to the acoustic boundary element model, and coarsening the finite element model of the three-dimensional entity simulation model to obtain an envelope surface mesh with the mesh size and the cell density different from those of the finite element model as the acoustic boundary element mesh model and obtain a node coordinate file of the acoustic boundary element mesh model;
and S5, directly endowing the dynamic response result to the boundary element grid nodes in the node coordinate file of the acoustic boundary element grid model, and calculating to obtain the acoustic physical quantity of the plate-type structure acoustic radiation.
Preferably, step S5 is replaced by: and according to the interpolation calculation principle of the inverse distance weighted average method, realizing numerical iteration mapping calculation between the finite element model and the boundary element model to obtain the acoustic physical quantity of the plate-type structure sound radiation.
On the basis of the common knowledge in the field, the above preferred conditions can be combined randomly to obtain the preferred embodiments of the invention.
The positive progress effects of the invention are as follows:
the invention solves the problems by coupling the multi-body dynamics and the boundary element method:
1. and (3) simulating the vibration noise of the whole piston engine. Different from the previous step-by-step solution, the invention carries out integrated calculation on the coupling vibration part and the noise part.
2. The calculation efficiency is high. Compared with a finite element noise algorithm, the boundary element noise algorithm has the main advantages that the modeling process is simpler, and the noise analysis in engineering is more facilitated.
Drawings
Fig. 1 is a flowchart of a vibration noise numerical simulation method for a piston engine according to embodiment 1 of the present invention.
Fig. 2 is a flowchart of a vibration noise numerical simulation method for a piston engine according to embodiment 2 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Example 1
As shown in fig. 1, the present embodiment provides a vibration noise numerical simulation method for a piston engine, which includes the following steps:
102, performing multi-body dynamics analysis on the three-dimensional entity simulation model by combining a finite element model to obtain a plurality of different excitation forces of the piston engine;
103, applying different excitation forces to the plate-type structure of the three-dimensional entity simulation model, and calculating to obtain dynamic response results (displacement and speed) of the plate-type structure under the different excitation forces by using a modal superposition principle;
104, solving the frequency range requirement of the acoustic physical quantity according to the acoustic boundary element model, and coarsening the finite element model of the three-dimensional entity simulation model to obtain an envelope surface mesh with the mesh size and the cell density different from those of the finite element model as the acoustic boundary element mesh model and obtain a node coordinate file of the acoustic boundary element mesh model;
and 105, directly endowing the dynamic response result to the boundary element grid nodes in the node coordinate file of the acoustic boundary element grid model, and calculating to obtain the acoustic physical quantity of the plate-type structure acoustic radiation.
Example 2
As shown in fig. 2, the present embodiment provides a vibration noise numerical simulation method for a piston engine, which includes the following steps:
202, carrying out multi-body dynamics analysis on the three-dimensional entity simulation model by combining a finite element model to obtain a plurality of different excitation forces of the piston engine;
and step 205, according to the interpolation calculation principle of the inverse distance weighted average method, realizing numerical iteration mapping calculation between the finite element model and the boundary element model to obtain the acoustic physical quantity of the plate-type structure acoustic radiation.
The key of the coupled multi-body dynamics and boundary element method for the vibration noise numerical simulation method of the piston engine is to perform mapping calculation on the results and the inputs of the two methods. The invention discloses a three-dimensional physical simulation model of a piston engine structure, a finite element model for structure dynamic response calculation and a boundary element grid model for structure acoustic radiation characteristic analysis, wherein the three are three homomorphic structures of the same object.
The invention combines the multi-body dynamics and the boundary element method, can greatly shorten the design time on the premise of ensuring the precision, and is particularly suitable for the actual engineering project.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that these are by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.
Claims (2)
1. A vibration noise numerical simulation method for a piston engine is characterized by comprising the following steps:
s1, establishing a three-dimensional solid simulation model and a finite element model thereof for the plate-type structure of the surface of the piston engine, and carrying out vibration mode analysis of the plate-type structure on the three-dimensional solid simulation model to obtain a surface mode result set and a surface node coordinate file of the plate-type structure;
s2, performing multi-body dynamics analysis on the three-dimensional entity simulation model by combining the finite element model to obtain a plurality of different excitation forces of the piston engine;
s3, applying different excitation forces to the plate-type structure of the three-dimensional entity simulation model, and calculating to obtain a dynamic response result of the plate-type structure under different excitation forces by using a modal superposition principle;
s4, solving the frequency range requirement of the acoustic physical quantity according to the acoustic boundary element model, and coarsening the finite element model of the three-dimensional entity simulation model to obtain an envelope surface mesh with the mesh size and the cell density different from those of the finite element model as the acoustic boundary element mesh model and obtain a node coordinate file of the acoustic boundary element mesh model;
and S5, directly endowing the dynamic response result to the boundary element grid nodes in the node coordinate file of the acoustic boundary element grid model, and calculating to obtain the acoustic physical quantity of the plate-type structure acoustic radiation.
2. A vibration noise value simulation method for a piston engine according to claim 1, characterised in that step S5 is replaced by: and according to the interpolation calculation principle of the inverse distance weighted average method, realizing numerical iteration mapping calculation between the finite element model and the boundary element model to obtain the acoustic physical quantity of the plate-type structure sound radiation.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112749499A (en) * | 2020-12-30 | 2021-05-04 | 深圳市大地和电气股份有限公司 | Simulation method and device for quickly diagnosing NVH performance of motor structure |
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Application publication date: 20200605 |