CN104462717A - Exhaust system hanging position optimizing method based on mode superposition - Google Patents
Exhaust system hanging position optimizing method based on mode superposition Download PDFInfo
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- CN104462717A CN104462717A CN201410817574.8A CN201410817574A CN104462717A CN 104462717 A CN104462717 A CN 104462717A CN 201410817574 A CN201410817574 A CN 201410817574A CN 104462717 A CN104462717 A CN 104462717A
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Abstract
The invention relates to the field of exhaust system design, in particular to an exhaust system hanging position optimizing method based on mode superposition. The method comprises the steps of firstly, calculating the mode of an exhaust system and learning the vibration performance of each order mode; secondly, numbering the potential positions of a hook consecutively from the hot end to cold end of an exhaust pipe shaft; thirdly, conducting weighted displacement summation on each order mode to obtain the weighted vibration mode indication displacement of each potential hanging position, and taking the position with small weighted vibration mode indication displacement as a final potential hanging position; finally, conducting sensitivity analysis on the hanging position of the exhaust system to further verify the reasonability of the hanging position based on the preliminarily selected exhaust system hanging position. According to the method, optimal selection of the hanging position of a lifting lug can be achieved at the earlier stage of complete vehicle development, and complete vehicle ride comfort matching design is guided. By the adoption of the exhaust system CAE analysis technical method adopting mode superposition, the influence of the position of the hook on NVH of a complete vehicle can be effectively predicted.
Description
Technical field
The present invention relates to exhaust system design field, relate to a kind of exhaust system hanging method for optimizing position based on mode superposition method specifically.
Background technology
Along with the development of society and the progress of technology, the requirement of people to Hyundai Motor is more and more higher.Compact conformation, spacious and comfortful, NVH automobile of good performance are well received.Automobile exhaust system is as one of the major influence factors of vehicle ride comfort, and its vibration problem is paid attention to widely obtaining.Automobile exhaust system is generally connected with enmgine exhaust and body platform with hanger respectively by flange.Owing to being subject to the impact of engine vibration itself and exhaust excitation, exhaust pipe vibrations is relatively large.The vibration of exhaust system can cause the vibration of body platform by hook and hanger, thus has a strong impact on the smooth-going performance of car load.
Summary of the invention
The object of the invention is to solve the problem, a kind of exhaust system hanging method for optimizing position based on mode superposition method is provided.
In order to realize object of the present invention, the technical solution used in the present invention is:
Based on an exhaust system hanging method for optimizing position for mode superposition method, its step is as follows:
First, calculate the mode of exhaust system, understand its each rank modal vibration characteristic; Secondly, potential site number consecutively will be linked up with along exhaust tubular axis from hot junction to cold junction; Then, displacement summation is weighted to each rank mode, obtains the weighting vibration shape instruction displacement of each potential hanging position, get weighting vibration shape instruction displacement smaller as the potential position of hanging; Finally, according to preliminary selected exhaust system hanging hanging point, the rationality that hanging position is verified in sensitivity analysis is further carried out to exhaust system hanging hanging point.
Described weighted shift read group total method is as follows, supposes single-point-excitation, and by many-degrees of freedom system Modal Analysis Theory, the frequency response function between response point l and point of excitation p is:
wherein,
l measuring point, r rank Mode Shape coefficient;
with
modal mass and damping ratios respectively, if the frequency of exciting force is
, then have approx
for linear system, the amplitude of dynamic respond and the amplitude of frequency response function are directly proportional, namely
suppose that the vibration shape is with mass matrix normalization, each rank modal damping approximately equal, then
the average driving degree of freedom displacement (ADDOFD) of a definable jth degree of freedom is
aDDOFD (j) can obtain certain degree of freedom in general excitation situation the relative size of dynamic respond, be in optimized selection with this hitch point position to lifting lug of exhaust system.
Beneficial effect of the present invention is: the method can realize the optimum choice of hanger hitch point position early stage at automobile research, to car load ride comfort matched design, there is important directive significance, use the exhaust system cae analysis technical method of this kind of mode superposition method, effectively can predict that hook position is on the impact of car load NVH.
Accompanying drawing explanation
Fig. 1 based on the exhaust system analysis process of mode superposition method,
Fig. 2 is vented hanging primary election potential site weighted shift curve.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further described:
Embodiment: see Fig. 1.
1) set up exhaust system finite element model, carry out Free Modal Analysis;
2) a part of potential exhaust system hanging node of primary election on finite element model, is weighted superposition calculation to the modal displacement of node;
3) according to the weighted shift of each potential node, in conjunction with each side factors such as layouts, exhaust system hanging position is determined;
4) according to the exhaust system hanging position determined, car load sensitivity analysis is carried out to verify the rationality that hanging position is chosen to exhaust system.
Described weighted shift read group total method is as follows, supposes single-point-excitation, and by many-degrees of freedom system Modal Analysis Theory, the frequency response function between response point l and point of excitation p is:
wherein,
l measuring point, r rank Mode Shape coefficient;
with
modal mass and damping ratios respectively, if the frequency of exciting force is
, then have approx
for linear system, the amplitude of dynamic respond and the amplitude of frequency response function are directly proportional, namely
suppose that the vibration shape is with mass matrix normalization, each rank modal damping approximately equal, then
the average driving degree of freedom displacement (ADDOFD) of a definable jth degree of freedom is
aDDOFD (j) can obtain certain degree of freedom in general excitation situation the relative size of dynamic respond, be in optimized selection with this hitch point position to lifting lug of exhaust system.
What embodiments of the invention were announced is preferred embodiment, but is not limited thereto, those of ordinary skill in the art; very easily according to above-described embodiment, understand spirit of the present invention, and make different amplifications and change; but only otherwise depart from spirit of the present invention, all in protection scope of the present invention.
Claims (2)
1., based on an exhaust system hanging method for optimizing position for mode superposition method, its step is as follows:
First, calculate the mode of exhaust system, understand its each rank modal vibration characteristic; Secondly, potential site number consecutively will be linked up with along exhaust tubular axis from hot junction to cold junction; Then, displacement summation is weighted to each rank mode, obtains the weighting vibration shape instruction displacement of each potential hanging position, get weighting vibration shape instruction displacement smaller as the potential position of hanging; Finally, according to preliminary selected exhaust system hanging hanging point, the rationality that hanging position is verified in sensitivity analysis is further carried out to exhaust system hanging hanging point.
2. a kind of exhaust system hanging method for optimizing position based on mode superposition method according to claim 1, its step is as follows: described weighted shift read group total method is as follows, suppose single-point-excitation, by many-degrees of freedom system Modal Analysis Theory, the frequency response function between response point l and point of excitation p is:
wherein,
l measuring point, r rank Mode Shape coefficient;
with
modal mass and damping ratios respectively, if the frequency of exciting force is
, then have approx
for linear system, the amplitude of dynamic respond and the amplitude of frequency response function are directly proportional, namely
suppose that the vibration shape is with mass matrix normalization, each rank modal damping approximately equal, then
the average driving degree of freedom displacement (ADDOFD) of a definable jth degree of freedom is
aDDOFD (j) can obtain certain degree of freedom in general excitation situation the relative size of dynamic respond, be in optimized selection with this hitch point position to lifting lug of exhaust system.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410817574.8A CN104462717A (en) | 2014-12-25 | 2014-12-25 | Exhaust system hanging position optimizing method based on mode superposition |
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| CN201410817574.8A CN104462717A (en) | 2014-12-25 | 2014-12-25 | Exhaust system hanging position optimizing method based on mode superposition |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106441938A (en) * | 2016-11-10 | 2017-02-22 | 中国汽车技术研究中心 | Dynamic testing device for vehicle exhaust system |
| CN106844962A (en) * | 2017-01-22 | 2017-06-13 | 无锡红湖消声器有限公司 | A kind of manifold heat cover stent based on Theory of Vibration installs position location method |
| CN106934127A (en) * | 2017-02-28 | 2017-07-07 | 江铃汽车股份有限公司 | The stress acquisition methods of the metallic framework of powertrain mounting system |
| CN108763766A (en) * | 2018-05-30 | 2018-11-06 | 无锡威孚力达催化净化器有限责任公司 | Oscillation intensity analysis method for exhaust system |
| CN109340060A (en) * | 2018-11-20 | 2019-02-15 | 深能南京能源控股有限公司 | A kind of tower frame for wind generating set vibrational state calculation method based on mode superposition method |
| CN109472094A (en) * | 2018-11-14 | 2019-03-15 | 北京长城华冠汽车技术开发有限公司 | It is vented sling point method for optimization analysis and system |
| CN113849911A (en) * | 2021-09-26 | 2021-12-28 | 重庆长安汽车股份有限公司 | Rapid analysis and evaluation method for arrangement of hanging points of exhaust system |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106441938A (en) * | 2016-11-10 | 2017-02-22 | 中国汽车技术研究中心 | Dynamic testing device for vehicle exhaust system |
| CN106844962A (en) * | 2017-01-22 | 2017-06-13 | 无锡红湖消声器有限公司 | A kind of manifold heat cover stent based on Theory of Vibration installs position location method |
| CN106934127A (en) * | 2017-02-28 | 2017-07-07 | 江铃汽车股份有限公司 | The stress acquisition methods of the metallic framework of powertrain mounting system |
| CN106934127B (en) * | 2017-02-28 | 2020-06-23 | 江铃汽车股份有限公司 | Method for acquiring stress state of metal framework of power assembly suspension system |
| CN108763766A (en) * | 2018-05-30 | 2018-11-06 | 无锡威孚力达催化净化器有限责任公司 | Oscillation intensity analysis method for exhaust system |
| CN109472094A (en) * | 2018-11-14 | 2019-03-15 | 北京长城华冠汽车技术开发有限公司 | It is vented sling point method for optimization analysis and system |
| CN109340060A (en) * | 2018-11-20 | 2019-02-15 | 深能南京能源控股有限公司 | A kind of tower frame for wind generating set vibrational state calculation method based on mode superposition method |
| CN113849911A (en) * | 2021-09-26 | 2021-12-28 | 重庆长安汽车股份有限公司 | Rapid analysis and evaluation method for arrangement of hanging points of exhaust system |
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Application publication date: 20150325 |