CN108763766B - Vibration intensity analysis method for exhaust system - Google Patents
Vibration intensity analysis method for exhaust system Download PDFInfo
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- CN108763766B CN108763766B CN201810538158.2A CN201810538158A CN108763766B CN 108763766 B CN108763766 B CN 108763766B CN 201810538158 A CN201810538158 A CN 201810538158A CN 108763766 B CN108763766 B CN 108763766B
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- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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Abstract
The invention provides a vibration intensity analysis method for an exhaust system, which comprises the following steps: inputting model information, a temperature signal and a vibration signal; the vibration signal adopts a relation curve of vibration acceleration along with rotating speed; setting a durability index; performing heat transfer analysis, and inputting a temperature signal by a finite element analysis method to obtain the temperature field distribution of the exhaust system structure; performing modal analysis, introducing temperature field distribution generated by heat transfer analysis, and obtaining modal characteristics of the exhaust system structure in a high-temperature state by a finite element analysis method; performing order vibration analysis, and performing corresponding vibration analysis on the vibration acceleration of each main order of the vibration signals so as to obtain response signals of the vibration acceleration and the stress of the exhaust system structure; analyzing and aligning the standard, and superposing stress values; and finally, evaluating an analysis result. The invention can more scientifically evaluate and predict the reliability level of the exhaust system product.
Description
Technical Field
The invention relates to the field of exhaust system strength analysis, in particular to a vibration strength analysis method for an exhaust system.
Background
Along with the tightening of national environmental protection laws and regulations, the exhaust temperature is continuously improved, and the light weight trend of exhaust system products puts forward more and more strict requirements on the structural reliability of the products.
In the field of reliability analysis of exhaust systems, the method usually stays in the stages of modal analysis and heat transfer analysis, the analysis method is too single, the structural strength of a product is too unilateral to predict, and the reliability of the structure cannot be accurately and quantitatively predicted. Therefore, it is necessary to comprehensively consider the actual working condition load to establish a more scientific and reasonable exhaust system strength analysis method.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a vibration intensity analysis method for an exhaust system, which can more scientifically evaluate and predict the reliability level of the exhaust system product. The technical scheme adopted by the invention is as follows:
a vibration intensity analysis method for an exhaust system, comprising the steps of:
step S1, inputting model information; the model information is an exhaust system digital-analog structure generated by three-dimensional modeling software;
step S2, inputting a temperature signal as a temperature field boundary of the analysis model; (ii) a
Step S3, inputting a vibration signal; the vibration signal adopts a relation curve of vibration acceleration along with rotating speed;
step S4, setting an endurance index; the endurance index is used for making a corresponding stress limit value according to the target endurance life and is used as a standard for strength evaluation;
step S5, heat transfer analysis is carried out, temperature signals are input through a finite element analysis method, and temperature field distribution of the exhaust system structure is obtained and stored;
step S6, performing modal analysis, introducing temperature field distribution generated by heat transfer analysis, and obtaining modal characteristics of the exhaust system structure in a high-temperature state by a finite element analysis method;
step S7, carrying out order vibration analysis, and carrying out corresponding vibration analysis on the vibration acceleration of each main order of the vibration signals by a finite element analysis method, thereby obtaining response signals of the exhaust system structure, including the vibration acceleration and the stress;
step S8, analyzing the benchmarks, comparing the results of the order vibration analysis with the vibration signals of the test, and then correcting the analysis parameters to make the results of the order vibration analysis approach to the vibration signals of the test; completing the calibration work of order vibration analysis;
step S9, superposing stress values, and superposing the stress values of the obtained exhaust system structure on the basis of the correction of the order vibration analysis result;
step S10, finally, evaluating the analysis result, and evaluating whether the structural strength of the product meets the set endurance index through the calibrated order vibration analysis result; if the model information meets the requirements, the vibration intensity is analyzed and evaluated, and if the model information does not meet the requirements, the structure of the input model information is optimized.
Further, in step S6, the modal characteristics of the exhaust system structure in the high temperature state include a natural frequency and a modal shape.
Further, in step S8, the calibration index used is the vibration acceleration.
Further, the analysis parameter corrected in step S8 is a damping parameter.
Further, in step S9, Mises stress value is selected as the index, and a linear superposition or lifetime correction superposition method is adopted.
The invention has the advantages that: the invention comprehensively considers objective environmental signals (temperature and vibration), endurance indexes and structural characteristics, carries out deep theoretical discussion and trial, considers each influence factor influencing the structural strength of the exhaust system product to the maximum extent, and can evaluate and predict the reliability level of the exhaust system product more scientifically.
Drawings
FIG. 1 is a flow chart of the analysis method of the present invention.
Fig. 2 is a graph of an example vibration signal of the present invention.
FIG. 3 is a plot of an example of an analysis versus calibration of the present invention.
FIG. 4 is a graph of an example stress result of the present invention.
Detailed Description
The invention is further illustrated by the following specific figures and examples.
As shown in fig. 1, the present invention provides a vibration intensity analysis method for an exhaust system, including the steps of:
step S1, inputting model information;
the model information is an exhaust system digital-analog structure generated by three-dimensional modeling software and generally adopts an stp format; carrying out model processing, meshing and analysis parameter setting, and comprises the following steps: boundary conditions, loads, material parameters, analysis step settings, etc.;
step S2, inputting a temperature signal as a temperature field boundary of the analysis model;
the temperature signal is obtained from the test in the engine bench test or the whole vehicle test process, and is stored in an Excel format;
step S3, inputting a vibration signal; the vibration signal adopts a relation curve of vibration acceleration along with rotating speed; as shown in fig. 2, three curves in fig. 2 from top to bottom represent vibration acceleration curves in the Z direction, the Y direction, and the X direction, respectively;
the vibration signal is a vibration acceleration value obtained by testing in the process of an engine bench test or a whole vehicle test. A relation curve of the vibration acceleration along with the rotating speed is generally adopted, 1000 rpm-6000 rpm is generally adopted as a rotating speed reference interval, and a main-order vibration acceleration signal is automatically generated through a signal acquisition instrument and stored in an Excel format;
step S4, setting an endurance index;
the endurance index is used for making a corresponding stress limit value according to the target endurance life and is used as a standard for strength evaluation;
step S5, heat transfer analysis is carried out, temperature signals are input through a finite element analysis method, and temperature field distribution of the exhaust system structure is obtained and stored;
the heat transfer analysis result is saved as an odb format file; the temperature field distribution is used as the boundary input of the subsequent analysis;
step S6, performing modal analysis, introducing temperature field distribution generated by heat transfer analysis, and obtaining modal characteristics of the exhaust system structure in a high-temperature state by a finite element analysis method;
the modal characteristics of the exhaust system structure in the high-temperature state comprise natural frequency and modal vibration mode, and the modal analysis result can be used as a key index for product strength evaluation, so that the product structure design can be helped to effectively avoid resonance phenomenon; the modal analysis result can be used as input information of subsequent order vibration analysis;
and step S7, performing order vibration analysis, and performing vibration analysis on the vibration acceleration of each main order of the vibration signal by a finite element analysis method. The orders 1.5, 3, and 4.5 are the main vibration orders for three-cylinder machines, and the orders 2, 4, and 6 are the main vibration orders for four-cylinder machines, and are generally distinguished specifically according to the characteristics of the vibration signal. The order vibration analysis can obtain response signals of the exhaust system structure, such as vibration acceleration, stress and the like;
step S8, analyzing and calibrating, comparing and analyzing the result of the order vibration analysis with the vibration signal of the test, wherein the generally adopted calibration index is vibration acceleration, and then correcting the analysis parameter (generally damping parameter) to make the result of the order vibration analysis approach to the vibration signal of the test; that is, in fig. 3, the curve a of the order vibration analysis result is made to approach the vibration signal curve b of the experimental test; thus completing the calibration work of order vibration analysis;
step S9, superposing stress values, and superposing the stress values on the stress values of the exhaust system structure obtained on the basis of the corrected order vibration analysis result; selecting the index as the stress value of the Mises, and generally adopting methods such as linear superposition or service life correction superposition and the like;
step S10, finally, evaluating the analysis result, and evaluating whether the structural strength of the product meets the set endurance index through the calibrated order vibration analysis result; if the model information meets the requirement, the vibration intensity is analyzed and evaluated, and if the model information does not meet the requirement, the input model information needs to be subjected to proper structure optimization to achieve the set endurance index;
FIG. 4 is a stress result example curve of the present invention, curve c is a stress result curve of a bracket weld, curve d is a stress result curve of a clam shell weld, the endurance index is 20MPa, the structural strength meets the set endurance index, and the vibration strength analysis is completed.
The vibration intensity analysis method for the exhaust system provided by the invention has the advantages of clear and reasonable flow, scientific and reliable result, strong pertinence and wide coverage, and can meet the vibration intensity evaluation requirements of exhaust system products.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (1)
1. A vibration intensity analyzing method for an exhaust system, characterized by comprising the steps of:
step S1, inputting model information; the model information is an exhaust system digital-analog structure generated by three-dimensional modeling software;
step S2, inputting a temperature signal as a temperature field boundary of the analysis model;
step S3, inputting a vibration signal; the vibration signal adopts a relation curve of vibration acceleration along with rotating speed;
step S4, setting an endurance index; the endurance index is used for making a corresponding stress limit value according to the target endurance life and is used as a standard for strength evaluation;
step S5, heat transfer analysis is carried out, temperature signals are input through a finite element analysis method, and temperature field distribution of the exhaust system structure is obtained and stored;
step S6, performing modal analysis, introducing temperature field distribution generated by heat transfer analysis, and obtaining modal characteristics of the exhaust system structure in a high-temperature state by a finite element analysis method;
the modal characteristics of the exhaust system structure in the high-temperature state comprise natural frequency and modal vibration mode; the modal analysis result is used as a key index for evaluating the strength of the product, and the modal analysis result is used as input information of subsequent order vibration analysis;
step S7, carrying out order vibration analysis, and carrying out corresponding vibration analysis on the vibration acceleration of each main order of the vibration signals by a finite element analysis method, thereby obtaining response signals of the exhaust system structure, wherein the response signals comprise the vibration acceleration and the stress;
step S8, analyzing the benchmarks, comparing the results of the order vibration analysis with the vibration signals of the test, and then correcting the analysis parameters to make the results of the order vibration analysis approach to the vibration signals of the test; completing the calibration work of order vibration analysis;
step S9, superposing stress values, and superposing the stress values of the obtained exhaust system structure on the basis of the correction of the order vibration analysis result;
step S10, finally, evaluating the analysis result, and evaluating whether the structural strength of the product meets the set endurance index through the calibrated order vibration analysis result; if the model information meets the requirements, analyzing and evaluating the vibration intensity of the time, and if the model information does not meet the requirements, performing structure optimization on the input model information;
in step S8, the adopted calibration index is vibration acceleration;
the analysis parameter corrected in step S8 is a damping parameter;
in step S9, Mises stress value is selected as the index, and a linear superposition or lifetime correction superposition method is used.
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