RISS 검색 - 국내학술지논문

1
NEURAL-EMPIRICAL TYRE MODEL BASED ON RECURSIVE LAZY LEARNING UNDER COMBINED LONGITUDINAL AND LATERAL SLIP CONDITIONS

M. J. L. BOADA,B. L. BOADA,D. GARCIA-POZUELO,V. DIAZ 한국자동차공학회 2011 International journal of automotive technology Vol.12 No.6
The behaviour of the tyre plays an important role in the vehicle handling. An accurate tyre model that estimates these forces and moments it is highly essential for the studies of vehicle behaviour. For the last ten years neural networks have attracted a great deal of attention in vehicle dynamics and control. Neural networks have been effectively applied to model complex systems due to their good learning capability. In this paper a recursive lazy learning method based on neural networks is considered to model the tyre characteristics under combined braking and cornering. The proposed method is validated by comparison with experimental obtained responses. Results show the estimated model correlates very well with the data obtained experimentally. Moreover, the neural model proposed allows to include the asymetric tyre behaviour in the tyre model without difficulty.
2
METHODOLOGY FOR BUS STRUCTURE TORSION STIFFNESS AND NATURAL VIBRATION FREQUENCY PREDICTION BASED ON A DIMENSIONAL ANALYSIS APPROACH

A. GAUCHÍA,E. OLMEDA,M. J. L. BOADA,B. L. BOADA,V. DÍAZ 한국자동차공학회 2014 International journal of automotive technology Vol.15 No.3
- 복사/대출신청
Engineering bus design requires testing of bus structures prototypes in order to guarantee a certain level ofstrength and an appropriate static and dynamic behavior of the bus superstructure when exposed to road loads. However,experimental testing of real bus structures is very expensive as it requires expensive resources and space. If testing is done ona scale bus model the previous required expenses are considerably reduced. Therefore, a novel methodology based ondimensional analysis applied to bus structure prediction to evaluate the bus structure static and dynamic performance isproposed. The static performance is evaluated attending to torsion stiffness and the dynamic in terms of the natural vibrationfrequencies and rollover threshold. A scale bus has been manufactured and dimensionless parameters have been defined inorder to project the results obtained in the scale bus model to a larger model. Validation of the proposed methodology has beencarried out under experimental and finite element analysis.
3
TORSIONAL STIFFNESS AND WEIGHT OPTIMIZATION OF A REAL BUS STRUCTURE

A. GAUCHIA,V. DIAZ,M. J. L. BOADA,B. L. BOADA 한국자동차공학회 2010 International journal of automotive technology Vol.11 No.1
- 복사/대출신청
In this paper, the structural optimization of a real bus structure is proposed. The proposed optimization has been accomplished by means of genetic algorithms. The structural behavior of the bus structure when subjected to weight and torsion was also analyzed using the finite element method (FEM). The results demonstrate that improved weight and torsional stiffness are achieved with the optimized structure.
4
NEW TYRE-ROAD CONTACT MODEL FOR APPLICATIONS AT LOW SPEED

D. GARCIA-POZUELO,V. DIAZ,M. J. L. BOADA 한국자동차공학회 2014 International journal of automotive technology Vol.15 No.4
- 복사/대출신청
Most of the tyre models have been developed for high speed, combined forces, etc., however, in certain testsit is necessary to know tyre behaviour at very low speed in order to evaluate different systems. So, during vehicle inspectionand maintenance of the steering and brake system, by means of sideslip tester and roller brake tester respectively, the forcestransmitted by the tyres are measured; all of these inspections are carried out at low speeds. Furthermore, usually, automobilevehicles run at low speeds during an important part of their operating life (less than 60 km/h), mainly during urban traffic, andin steady state conditions. Therefore, it is particularly interesting to develop an accurate model of the contact patch tyrepavementfor low speeds without the complexity of models that cover a wide speed range but provide less precision at verylow speeds. The dynamometer plate has proved to be an appropriate test equipment to characterise the tyre-pavement contactat low speed and the steering geometry and wheel alignment. It has the feature of being able to carry out tests with the tyreinstalled in the vehicle as in completely real conditions. The main aim of this research is to set up a contact model betweentyre and pavement at very low speed based on the measurement of longitudinal and lateral forces. A test methodology thatallows carrying out the experimental tests in a systematic and controlled way with the dynamometer plate has also beendeveloped. From this model it will be possible to estimate the forces that tyres are capable of transmitting in differentsituations to act in the parameters which affect these forces and maximize them.

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