Effect of Design Parameters on Buckling Tendency of an Eccentric Drag Link Used in a Truck Steering Linkage: A DoE/RSM-Based Design Optimisation Study

Abstract

The steering system, deemed one of the most critical subsystems for ensuring the safety of a vehicle, is characterised by its pivotal role in manoeuvrability and control. The primary function of transmitting the steering input from the steering wheel to the vehicle's wheels is carried out by the drag link within the steering system. Therefore, the durability and proper functioning of the drag link in vehicles, especially carrying heavy loads, are of critical importance for both safety and efficiency. The main purpose of this study is to determine the optimal geometry of the drag link utilised in the steering system of a 4x2 truck using the Design of Experiments-Response Surface Methodology (DoE-RSM). Firstly, an idealised worst-case load model was used to determine the maximum force applied by the Pitman arm on the drag link. The stress distribution and deformation on the drag link caused by the maximum design load were deter-mined using Finite Element Analysis (FEA). Based on the results of the analyses, eccentricity, rod thickness, and fillet radius were defined as design parameters. The parameter ranges were determined by considering the volume swept by the wheel and buckling criteria under maximum load conditions. According to the DoE-RSM results, concerning the local sensitivity per-centages of the parameters on total deformation, it was observed that the eccentricity (e) parameter has the most significant impact, with an approximate positive rate of 74%.

Keywords

• Commercial Vehicle
• Finite Element Analysis
• Optimization
• Steering System
• Structural Design

References

1. [1] Jazar RN. Vehicle dynamics. Berlin/Heidelberg, Germany: Springer; 2008.
2. [2] Rill G. Vehicle Dynamics. Lecture notes; 2009.
3. [3] Topaç MM, Tanrıverdi A, Çolak O, Bilal L, Maviş M. Anal-ysis of The Failure Modes and Design Improvement of an Eccentrically Loaded Connecting Rod for a Double Front Axle Steering Linkage Prototype. Engineering Failure Analy-sis. 2021; 122: 1052-04. https://doi.org/10.1016/j.engfailanal.2020.105204
4. [4] Vijaykumar V, Anand P. Design Optimization of Suspension and Steering Systems for Commercial Vehicles. In: Proceed-ings of ICDMC 2019: Design, Materials, Cryogenics, and Constructions. Springer Singapore. 2020; p. 129-142. https://doi.org/10.1007/978-981-15-3631-1_13
5. [5] Kılınç I, Toros S. Investigation of The Effect of Bending Process on Fatigue Life and Mechanical Strength of Heavy Commercial Vehicle Drag Links. Eurasian Journal of Sci-ence Engineering and Technology. 2022;3.2: 91-102. https://doi.org/10.55696/ejset.1195927
6. [6] Patil MA, Chavan D, Ghorpade MKUS. FEA of Tie Rod of Steering System of Car. International Journal of Application or Innovation Engineering and Management.2013; 2.5: 222-227.
7. [7] Okur MZ, Bircan DA. Design and Simulation of A Heavy-Duty Vehicle Steering Component by Analytic and FEA Method. Eurasian Journal of Science Engineering and Tech-nology. 2021; 2.1: 1-9.
8. [8] Nazaruddin N, Adhitya M, Sumarsono DA, Siregar R, Her-yana G, Prasetya S. Static Analysis for the Development of the Steering Mechanism System in the Large Bus as a Prelim-inary Study for Conversion of Hydraulic Power Steering to Electric Power Steering. In; AIP Conference Proceedings. 2021 September; Vol. 2376, No. 1. https://doi.org/10.1063/5.0064487.

9. [9] Kurna S, Jain S, Raja P, Vishwakarma L. Truck Steering Component and Linkages Analysis Using Finite Element Method. SAE Technical Paper. 2017; 01-1478. https://doi.org/10.4271/2017-01-1478.
10. [10] Özmen B, Topaç MM. Effect of Damping Rate on Fatigue Failure Tendency of a Topology-Optimised Swing Arm for a Heavy Commercial Truck Cab Suspension. Engineering Failure Analysis. 2022 ;137: 106276. https://doi.org/10.1016/j.engfailanal.2022.106276
11. [11] Sharp RS, Granger R. On Car Steering Torques at Parking Speeds. Proceedings of the Institution of Mechanical Engi-neers, Part D: Journal of Automobile Engineering. 2003; 217.2: 87-96. https://doi.org/10.1177/095440700321700202
12. [12] Topaç MM, Karaca M, Atak M, Deryal U. Response Sur-face-Based Design Study of a Relay Lever for a Bus Inde-pendent Suspension Steering Mechanism. International Jour-nal of Automotive Engineering and Technologies. 2017:1-10.
13. [13] Topaç MM, Bahar İ, Kuralay NS. Mass and Stress Optimisa-tion of a Multi-Purpose Vehicle Front Axle Differential Housing for Various Driving Conditions. DÜBİTED. 2016;4(2):501-13. (In Turkish with an abstract in English)
14. [14] Topaç MM, Duran İ, Kuralay NS. Kinematic Optimisation of the Steering Trapezoid of a 4WD Vehicle by Using Design of Experiments Approach. DUBİTED. 2016;4(2):514-27. (In Turkish with an abstract in English)
15. [15] Popov EP. Mechanics of Materials.2nd ed. Englewood Cliffs, N.J.: Prentice-Hall, Inc.; 1976.
16. [16] Shigley JE, Mischke CH. Mechanical Engineering Design. McGraw-Hill; 1989.
17. [17] Beer F, Johnston EJ, Dewolf J, Mazurek D. Mechanics of Materials. McGraw-Hill ;2012.
18. [18] Oz Y, Ozan B, Uyanik E. Steering System Optimization of a Ford Heavy-Commercial Vehicle Using Kinematic & Com-pliance Analysis. SAE Technical Paper, 2012; 2012-01-1937. https://doi.org/10.4271/2012-01-1937.
19. [19] Doğan O, Kalay O, Kartal E, Karpat F. Optimum Design of Brake Pedal for Trucks Using Structural Optimization and Design of Experiment Techniques. Int J Automot Sci Tech-nol. 2020;4(4):272-80. https://doi.org/10.30939/ijastech..783552.
20. [20] Güleryüz İC. Lightweight Design of a Torque Plate of Z-Cam Drum Brake for Heavy Duty Vehicles. Int J Automot Sci Technol. 2019;3(2):42-50. https://doi.org/10.30939/ijastech..568059.
21. [21] Amago, T. Sizing Optimization Using Response Surface Method in FOA. R&D Review of Toyota CRDL.2002; 37.1: 1-7.
22. [22] Hilgers M, Achenbach W. Chassis and Axles. Berlin: Spring-er Vieweg ;2021.
23. [23] Aydın M, Ünlüsoy, YS. Optimization of Suspension Parame-ters to Improve Impact Harshness of Road Vehicles. The In-ternational Journalof Advanced Manufacturing Technolo-gy.2012; 60: 743-754. https://doi.org/10.1007/s00170-011-3589-7
24. [24] Aydın, M., & Ünlüsoy, Y. S. Optimization of Suspension Parameters to Improve Impact Harshness of Road Vehi-cles. The International Journal of Advanced Manufacturing Technology. 2012,60:743-754. https://doi.org/10.1007/s00170-011-3589-7
25. [25] D. C. Montgomery, Design and Analysis of Experiments. 5th Ed. Hoboken, New Jersey, John Wiley & Sons, 2000.
26. [26] R. H. Myers, D. C. Montgomery, C. M. Anderson-Cook, Re-sponse Surface Methodology, Process and Product Optimi-zation Using Design of Experiments, 3rd Edition. Hoboken, New Jersey: John Wiley & Sons, 2009