Cargo delivery by trucks is a main method of transportation of goods to the cities and other places. Many goods are transported by articulated lorries. Thus, improving the design methods of the articulated lorries is relevant. Trailer suspension is the object under study. A fatigue life prediction of the trailer suspension components is a urgent task at the early stage of design concept development. The formation principles of the MBD model is essential in obtaining best results. In this paper two types of models are considered: containing only the rigid bodies; containing the flexible bodies. Research objective: the investigation of the effect of the load distribution that was obtained using different MBD models on the durability of suspension parts. A comparison of the results obtained using the different suspension models was performed. The research has shown that loads are reducedusing the flexible bodies in the MBD model. Using flexible bodies permits to specify the results of the durability analysis.
The paper describes a quad bike frame design procedure with the use of topology optimization technique. The design space specific properties, quad bike specific load cases and problem formulation for topology optimization are presented. Topology optimization results – beneficial load paths of the frame structure – have been interpreted into a new frame design providing sufficient space for placement of all systems of the vehicle. The new frame strength has been proved using finite element method. Comparing with the previous steel frame design, the new frame of the quad bike has become 2 times as stiff and 17% lighter while having low stress levels due to the substitution of aluminum material for steel and a new optimized topology of the frame load-bearing structure.
The paper presents a technique for strain-stress calculation using finite element analysis for wheeled vehicle’s load bearing frames with the use of loads, obtained from full vehicle multi body dynamics models (MBD models). In this technique, boundary conditions need not to be defined, as the inertia relief method used. Frame and suspension parts are imposed in MBD model as flexible bodies to increase accuracy of loads calculations. The presented method is capable to automatize loading procedure of finite-element models, thus decreasing computational costs and results processing costs while analyzing numerous load cases. As an example, strength analysis of 6x6 articulated vehicle frame is presented. Proposed method compared to “classic” finite-element frame modelling technique, which use conventional loads formulation and fixed boundary conditions. In load case “standing on ground”, calculation results with the use of two methods demonstrate high convergence in zones, located far from suspension and frame mounting joints. For load case “hanging of second axis” results are significantly different, due to ability of MBD-model to capture behavior of suspension links, and calculate true vehicle frame movement in space in particular load case. Loading procedure of frame finite element model is automated, using script, which transfer loads from MDB-model.
Introduction (statement of the problem and relevance). Reducing the power elements mass of mining dump trucks to increase their load capacity without losing strength indicators is an important task. When creating modern models of heavy-loaded mining trucks, special attention should be paid both to the design of load-bearing elements of the system and passive safety structures, taking into account their joint work. The use of topological optimization methods at the early stages of design has become widespread in the creation of highly loaded elements of wheeled vehicles.The purpose of the research was to study the effect of loading conditions on the power circuits of loadbearing systems and protective structures, as well as to formulate recommendations for creating the structures at the initial design stage for improving the strength and safety of mining trucks by means of the topological optimization method based on the finite element method and to work out the stiffness algorithm.Methodology and research methods. The article presents a dynamic mathematical model of a wheeled vehicle created in the program for modeling the rigid bodies dynamics for determining loads. The power circuits of the carrier system and the protective structure were obtained with the help of the topological optimization method based on the finite element method. The object of the study was a mining truck with a gross weight of 220 tons. The subject of the research was to study the methods of optimal design and use of the vehicles load-bearing structures taking into account operating conditions.Scientific novelty and results. The influence of load modes on the power circuits of the carrier system and the protective structures has been revealed. Recommendations were given for the choice of load modes at the early stages of designing mining dump trucks for topological optimization. The power circuits of the carrier system and the protective structures were presented. Conclusions were drawn concerning the influence of load modes on the power structures of load-bearing elements.Practical significance. The results obtained can be used to create highly loaded elements of mining trucks.
In this paper, the snowmobile multi-body dynamic (MBD) model is presented. Mass reduction of the snowmobile parts is the important problem in the process of creating a new vehicle. It is important to determine loads to create rational designs of parts. There are various modeling methods for determining loads. More convenient method is using the MBD model. Research objective: development of the snowmobile MBD model, taking into account the main features of its design. It is possible to perform optimization and strength calculations of snowmobile parts using defined loads at early stages of the development.
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