The paper is dedicated to describing the methods of measuring the characteristics of suspension air springs (elastic pneumatic elements) on a test bench, as well as to the methods of evaluating their effect on vehicle parameters. The results of the measurement of air spring characteristics on the test bench under various conditions are presented together with the analysis of changes in their properties. A method for setting a universal force (load bearing) characteristic of the air spring, as well as a method for simulating it in the vehicle are suggested. The results of the vehicle simulation with characteristics of the air springs of different stiffness are shown, a numerical interval of the possible change in the vehicle behaviour parameters in case of change of suspension stiffness in the process of driving is specified.
The reduction in the duration of the development of new vehicles and the associated desire to re-duce the costs of automotive plants contribute to a more active application of mathematical model-ing to solve engineering problems. The tasks, which are analyzing and predicting the fatigue life of vehicle components and assemblies, can be solved using a set of methods and tools of mathematical modeling. This article discusses the development of a complex of mathematical models of the front and rear suspensions of a passenger automobile, which have the properties necessary for accurate reproduc-tion of wheel loads and dynamic behavior of the suspension as a mechanical system. The complex of mathematical models is implemented in a multi-link modeling environment. The models are de-signed to carry out a subsequent validation study of the loading of individual suspension compo-nents during forced service life tests. In the future, this complex of mathematical models can be used for simulation of semi-natural forced resource tests of the suspension module, as well as a sample for the development of suspension models of other automobiles. The purpose of this work is to form sufficient requirements for mathematical models for the im-plementation of fatigue durability studies using mathematical modeling methods and obtaining reli-able calculation results. Research engineers will be able to follow these requirements to determine and collect initial data for the development of their own mathematical models.
BACKGROUND: Development of numerical methods and technology of computer-aided engineering, used in vehicle design, has reached its high level. Results of virtual experiments cannot be totally relied upon without verifying results obtained with the developed mathematical model. That is why the present paper concentrates on the relevant issue of validation of the CAE models, applicable for vehicle suspension components dynamic load analysis. AIMS: Goal of the research is adequacy confirmation of developed requirements to preparation of simulation models, applicable for dynamic load and fatigue analysis, by means of numerical simulation with validation analysis. METHODS: CAE models validation is carried out with a comparative method of results obtained from either laboratory or proving ground testing and simulation of a physical object. Strain gauging results are taken for the comparison. The Models are prepaired with using MBS and FEM technologies. RESULTS: Validation showed of validation show a good convergence of modelling and experiment results, that confirm adequacy of developed requirements to creation of CAE models, applicable for load and fatigue analysis of vehicle suspension components. The selected convergence evaluation criteria have not been used in similar papers yet and have shown an effective outcome of quantitative and qualitative comparison of loading condition of suspension parts in a variety of boundary conditions of mechanical system simulation. CONCLUSIONS: Validated CAE models of a passenger car suspension, developed accelerated loading cycle, the model design and dynamic loading simulation approach can be used for chassis parts load analysis and fatigue prediction during early stages of development and as support of testing.
Introduction (problem statement and relevance). Automotive manufacturers and research engineers around the world are actively engaged in improving the methods of checking the safety and durability of the vehicle, vehicle components and systems. Testing and evaluation methods play an important role in solving this problem. This article reveals the issues of using the methods for determining the equivalent mileage of a vehicle in accordance with accumulation of pseudodamage, which includes well-known methods and procedures, and also describes the results of applying the methods in practice.The purpose of the research is development of the program of accelerated durability testing of the М1С category vehicle based on the application of the methods for determining the equivalent mileage.Methodology and research methods. The method is based on the approaches of the material fatigue curve definition, the rule of linear damage accumulation, the theory of counting the number of loading-unloading hysteresis cycles with the rain flow method approach and subsequent comparative analysis according to values of accumulated pseudo damage.Scientific novelty and results. The main results were obtained in the form of a program of accelerated durability testing of the М1С category vehicle, in addition, the features of using the method for determining the equivalent mileage of a vehicle based on the accumulation of pseudo-damages are disclosed.Practical significance. The obtained result is applicable in the field of studies of the durability of the load-bearing components of the vehicle and its subsystems using the capabilities of the test base and mathematical modeling tools, in addition, the results are of practical importance in the development of accelerated durability testing of competing vehicles, similar in weight and size parameters to the studied.
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