CN103473395A - Finite element analysis method for simulating ride comfort of entire vehicle under pulse input - Google Patents
Finite element analysis method for simulating ride comfort of entire vehicle under pulse input Download PDFInfo
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- CN103473395A CN103473395A CN201310367637XA CN201310367637A CN103473395A CN 103473395 A CN103473395 A CN 103473395A CN 201310367637X A CN201310367637X A CN 201310367637XA CN 201310367637 A CN201310367637 A CN 201310367637A CN 103473395 A CN103473395 A CN 103473395A
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Abstract
The invention relates to a finite element analysis method for simulating ride comfort of an entire vehicle under pulse input. The finite element analysis method comprises the following steps: (1) establishing an automobile finite element model by using computer software at a design and development stage of an automobile; (2) defining a transient excitation buffer strip or triangular bump size model; (3) calculating loading parameters; (4) enabling front and rear wheels to passthrough a buffer strip or triangular bump at a certain speed while simulating left and right wheels of the automobile; (5) calculating transient response of the automobile at certain timeunder aninput determinate signal. The research and development period is shortened; the research and development cost is saved; the operation is convenient; only 2-3 hours are required for calculating the ride comfort of the entire vehicle through the software; the ride comfort of the automobile can be very easily improved through a finite element method.
Description
Technical field
The present invention relates to automotive field, be specifically related to a kind of finite element method of simulating car load ride comfort under the pulse input.
Background technology
Automobile ride refers to when automobile travels in general travel speed scope, can guarantee that the occupant can be because body vibrations and impact cause uncomfortable and tired sensation, and the intact performance of maintenance goods carried.It is a very important index in the automobile properties, and degree of fatigue, comfortableness and cargo security that its quality not only has influence on driver, occupant transport reliably, and affects the problems such as fuel economy of automobile.The fundamental purpose of research automobile ride is exactly to control the dynamic perfromance of automobile vibration system, makes " output " of vibration be no more than certain limit under " input " of given operating mode, to keep occupant's comfortableness.Along with social development and growth in the living standard, people to automobile particularly the ride comfort of family saloon require more and more highlyer, the ride comfort that therefore how to improve automobile just seems particularly important.Present stage, automobile ride adopted the method for real vehicle test substantially, and relevant regulations has also been done to the automobile ride test method by country.The ride comfort of the method assessment automobile of testing by real vehicle has following shortcoming:
Increased the R&D cycle;
Increased R & D Cost;
Improve raising more difficult;
Adopt the ride comfort of the method assessment automobile of real vehicle test, this one-phase must be that research and development data are now all freezed in the research and development later stage.As found that in test ride comfort does not meet national standard, the space of improving so raising is relatively very little.
Summary of the invention
The object of the present invention is to provide and a kind ofly in the Automobile Design development, utilize computer software to estimate the finite element method of automobile ride performance.Design development at automobile, utilize computer software to set up the automobile finite element model, calculate automobile based on NASTRAN software and input the transient response of determining signal under certain hour, left and right wheels simultaneously, front and back wheel is successively by buffer bar or triangular bump, respond style has the vibration of bearing circle, seat guide rail, core wheel, and the noise in car etc.
Concrete technical scheme is as follows:
A kind of finite element method of simulating car load ride comfort under the pulse input, comprise the steps:
(1), in the design development of automobile, utilize computer software to set up the automobile finite element model;
(2) definition transient excite buffer bar or triangular bump dimension model;
(3) calculate loading parameters;
(4) the simulated automotive left and right wheels while, and front and back wheel is successively passed through buffer bar or triangular bump with certain speed of a motor vehicle;
(5) calculate automobile and input the transient response of determining signal under certain hour.
Further, in step (1), the automobile finite element model comprises vehicle body, opening tool, chassis, interior exterior trim annex etc.
Further, adopt sinusoidal buffer bar in step (2).
Further, the 1/2 sinusoidal buffer bar that the transient excite buffer bar is 180mm*30mm.
Further, described in step (3), parameter comprises: by the speed of buffer bar, by the time of buffer bar and the time of front and back wheel delay, adopt the height of conversion buffered of equivalent force method, the size of equivalent force equals the rigidity of tire and the product of buffer bar height.
Further, further comprise step (6): output calculated response curve.
Further, response curve comprises front and back wheel heart acceleration response curve and steering wheel vibration curve.
Further, the contact point that the load(ing) point in step (4) is four-wheel and ground.
Further, the described transient response in step (5) comprises car internal vibration and noise.
Further, calculate automobile based on NASTRAN software and input the transient response of determining signal under certain hour, and/or described car internal vibration and noise comprise the vibratory response of bearing circle, seat guide rail, core wheel and the noise in car.
With currently available technology, compare, the present invention has following advantage:
Shorten the R&D cycle;
Save R&D costs;
Operation is convenient;
The car load ride comfort that calculates a car by software only needs 2-3 hour, and, be easy to improve by Finite Element Method the ride comfort that improves automobile.
The accompanying drawing explanation
Fig. 1 is the present invention's vehicle finite element model
Fig. 2 is sinusoidal buffer bar cross dimensions shape
Fig. 3 is transient analysis load(ing) point schematic diagram
Fig. 4 is transient analysis front and back wheel heart acceleration response curve, and solid line is front core wheel, and dotted line is rear core wheel
Fig. 5 is transient analysis steering wheel vibration acceleration responsive curve, the three response curve that solid line is bearing circle, the twelve-hour response curve that dotted line is bearing circle
Embodiment
Below describe the present invention with reference to the accompanying drawings, it is a kind of preferred embodiment in numerous embodiments of the present invention.
Calculate certain vehicle with the speed of a motor vehicle of 30km/h by being of a size of the 1/2 sinusoidal buffer bar of 180mm*30mm, and output is core wheel and vibratory response bearing circle.The wheelbase of this vehicle is 2548mm.
1, utilize computer software to set up certain vehicle finite element model, comprise vehicle body, opening tool, chassis, interior exterior trim annex etc., see Fig. 1.
2, definition transient excite buffer bar dimension model (this analysis take 1/2 sinusoidal buffer bar be example), be shown in Fig. 2.
3, calculate loading parameters.
During this example is calculated, unit adopts as follows: length (mm), time (s), weight (kg), density (kg/mm
3), correlation parameter is:
Speed by buffer bar: V=30Km/h=8333.3mm/s;
By the time of buffer bar: T=180mm/8333.3mm/s=0.0216s;
The time that front and back wheel postpones: DELAY=2548mm/8333.3mm/s=0.306s;
Adopt the height of conversion buffered of equivalent force method, the size of equivalent force equals the rigidity of tire and the product of buffer bar height.
4, load(ing) point and response point.Vehicle right and left wheel simultaneously, and front and back wheel successively with the speed of a motor vehicle of 30Km/h by buffer bar, be output as the response of bearing circle, seat guide rail, core wheel and the noise in car.The contact point that load(ing) point is four-wheel and ground, be shown in Fig. 3.
5, output calculated response curve.It is example that this example be take output front and back wheel heart acceleration response curve and steering wheel vibration curve, sees Fig. 4, Fig. 5.
The present embodiment has following advantage:
1. at initial stage of development, utilize the cae analysis method to estimate automobile ride;
2. shorten the R&D cycle, favourable control R&D costs;
3. car internal vibration and noise while estimating automobile by buffer stopper or triangular bump, improve passenger comfort.
The above is exemplarily described the present invention by reference to the accompanying drawings; obviously specific implementation of the present invention is not subject to the restrictions described above; as long as the various improvement that adopted method design of the present invention and technical scheme to carry out; or directly apply to other occasion without improvement, all within protection scope of the present invention.
Claims (10)
1. a finite element method of simulating car load ride comfort under the pulse input, is characterized in that, comprises the steps:
(1), in the design development of automobile, utilize computer software to set up the automobile finite element model;
(2) definition transient excite buffer bar or triangular bump dimension model;
(3) calculate loading parameters;
(4) the simulated automotive left and right wheels while, and front and back wheel is successively passed through buffer bar or triangular bump with certain speed of a motor vehicle;
(5) calculate automobile and input the transient response of determining signal under certain hour.
2. the finite element method of simulation car load as claimed in claim 1 ride comfort under the pulse input, is characterized in that, in step (1), the automobile finite element model comprises vehicle body, opening tool, chassis, interior exterior trim annex etc.
3. the finite element method of simulation car load as claimed in claim 1 or 2 ride comfort under the pulse input, is characterized in that, adopts sinusoidal buffer bar in step (2).
4. the finite element method of simulation car load as claimed in claim 3 ride comfort under the pulse input, is characterized in that the 1/2 sinusoidal buffer bar that the transient excite buffer bar is 180mm*30mm.
5. the finite element method of simulation car load as described as any one in claim 1-4 ride comfort under pulse input, it is characterized in that, described in step (3), parameter comprises: by the speed of buffer bar, by the time of buffer bar and the time of front and back wheel delay, adopt the height of conversion buffered of equivalent force method, the size of equivalent force equals the rigidity of tire and the product of buffer bar height.
6. the finite element method of simulation car load as claimed in claim 1 ride comfort under the pulse input, is characterized in that, further comprises step (6): output calculated response curve.
7. the finite element method of simulation car load as claimed in claim 6 ride comfort under the pulse input, is characterized in that, response curve comprises front and back wheel heart acceleration response curve and steering wheel vibration curve.
8. the finite element method of simulation car load as described as any one in claim 1-7 ride comfort under the pulse input, is characterized in that the contact point that the load(ing) point in step (4) is four-wheel and ground.
9. the finite element method of simulation car load as described as any one in claim 1-8 ride comfort under the pulse input, is characterized in that, the described transient response in step (5) comprises car internal vibration and noise.
10. the finite element method of simulation car load as claimed in claim 9 ride comfort under pulse input, it is characterized in that, calculate automobile based on NASTRAN software and input the transient response of determining signal under certain hour, and/or described car internal vibration and noise comprise the vibratory response of bearing circle, seat guide rail, core wheel and the noise in car.
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| CN104166778A (en) * | 2014-09-05 | 2014-11-26 | 上海理工大学 | Method for optimizing rigidity and damping of contact part of automobile seat guide rail |
| CN104180996A (en) * | 2014-08-01 | 2014-12-03 | 奇瑞汽车股份有限公司 | Opening member motion process analyzing method and electronic device |
| CN105512424A (en) * | 2015-12-22 | 2016-04-20 | 湖南大学 | Method for obtaining engineering machinery tyre vertical characteristic parameters based on pulse test |
| CN106644519A (en) * | 2017-01-17 | 2017-05-10 | 北京汽车研究总院有限公司 | Vehicle vertical dynamical model parameter identification method and vehicle vertical dynamical model parameter identification device |
| CN106991216A (en) * | 2017-03-16 | 2017-07-28 | 重庆长安汽车股份有限公司 | The robustness that automobile cooling module causes steering wheel to be shaken is estimated and optimization method |
| CN107505139A (en) * | 2017-08-25 | 2017-12-22 | 北京新能源汽车股份有限公司 | Finished automobile fatigue testing method and device |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103761364A (en) * | 2013-12-26 | 2014-04-30 | 广西科技大学 | Design method for vehicle axle structure of passenger vehicle |
| CN104180996A (en) * | 2014-08-01 | 2014-12-03 | 奇瑞汽车股份有限公司 | Opening member motion process analyzing method and electronic device |
| CN104180996B (en) * | 2014-08-01 | 2016-08-17 | 奇瑞汽车股份有限公司 | Opening tool motor process analyzes method and electronic equipment |
| CN104166772B (en) * | 2014-08-26 | 2017-11-21 | 桂林电子科技大学 | A kind of simulating analysis of the stability of cargo vehicle ride comfort |
| CN104166772A (en) * | 2014-08-26 | 2014-11-26 | 桂林电子科技大学 | Truck smoothness stability simulated analysis method |
| CN104166778A (en) * | 2014-09-05 | 2014-11-26 | 上海理工大学 | Method for optimizing rigidity and damping of contact part of automobile seat guide rail |
| CN104166778B (en) * | 2014-09-05 | 2017-03-01 | 上海理工大学 | Automobile chair guide rail contact site rigidity and damping optimization method |
| CN105512424A (en) * | 2015-12-22 | 2016-04-20 | 湖南大学 | Method for obtaining engineering machinery tyre vertical characteristic parameters based on pulse test |
| CN105512424B (en) * | 2015-12-22 | 2018-01-26 | 湖南大学 | The method that off-the-road tyre Vertical Characteristic parameter is obtained based on pulse testing |
| CN106644519A (en) * | 2017-01-17 | 2017-05-10 | 北京汽车研究总院有限公司 | Vehicle vertical dynamical model parameter identification method and vehicle vertical dynamical model parameter identification device |
| CN106991216A (en) * | 2017-03-16 | 2017-07-28 | 重庆长安汽车股份有限公司 | The robustness that automobile cooling module causes steering wheel to be shaken is estimated and optimization method |
| CN106991216B (en) * | 2017-03-16 | 2020-04-07 | 重庆长安汽车股份有限公司 | Robustness estimation and optimization method for steering wheel shake caused by automobile cooling module |
| CN107505139A (en) * | 2017-08-25 | 2017-12-22 | 北京新能源汽车股份有限公司 | Finished automobile fatigue testing method and device |
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