In the 21st century, the rapid development of heavy commercial vehicles, in addition to power, economy, handling and stability, etc., the user requirements of the vehicle ride comfort is also gradually improving. Improve the commercial vehicle cab suspension system is to improve the ride comfort is one effective way of commercial vehicle cab suspension system design is of great significance. In this paper, as the research object of a commercial vehicle models in the study of air cab and air spring suspension system components based on the elastic properties, select the cab air suspension for commercial vehicles. In this paper, the use of modern computer simulation techniques, namely the joint using the finite element method and dynamic simulation methods for the commercial vehicle cab air suspension designed to provide early development of a modern means. Air spring elastic properties of the vehicle ride comfort is a key factor. In this paper, finite element method to solve this problem. But the air spring involving material nonlinearity, geometric nonlinearity and contact nonlinearity, the convergence calculation is more difficult, complex structure, this article uses the professional handling of the widely used finite element software for nonlinear problems - Msc. Marc to analyze the air spring. Established in the software air spring 1 / 2 finite element model obtained using this model, the air spring load - displacement curves of the static contact conditions and inflation pressure on the vertical bearing capacity, stiffness. Then the analysis results to the bearing capacity of the cab for the different conditions of load conditions, the right choice for the commercial vehicle cab suspension air springs.Taking a basic data and the use of commercial finite element analysis of elastic properties of the air spring as the basis, based on the ADAMS / View software, combined with theoretical knowledge and space vehicle kinematics knowledge, build a virtual prototype model of the vehicle, including frame, the main suspension system, steering system, powertrain and suspension systems, cab and suspension systems and tire road system and other subsystems. Under the current test vehicle ride comfort requirements of the standard spectrum as the system random road input, driver seat-weighted rms acceleration as the evaluation index, verify that the choice of the air suspension can effectively improve the vehicle riding comfort.
Key words: cab suspension, air spring, finite element, virtual prototyping
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