FLOW METER OPTIMIZATION BY USER DEFINED NONLINEAR FINITE ELEMENT

Authors have developed a nonlinear pipe element for MMG Co. Ltd who is owner of several patents pending of flow meters in order to take into account the Coriolis forces produced by the flow of fluids in vibrating pipes. The aim of the development is to improve the construction of existing Coriforce flow metals where the measuring method is based on the presence of Coriolis forces which are in linear relation with the mass flow in pipes. The paper discusses the modelling aspects and shows industrial example as well

NUMERICAL SIMULATION OF NONLINEAR VIBRATION SYSTEMS

The object of the paper is to offer a brief survey of numerical simulations in nonlinear vibration systems. The development of computational methods provided an opportunity to create various kinds of software which are able to analyse the properties of the above mentioned systems. The possibilities of several kinds of software are introduced with the aid of a numerical example

Experimental and Numerical Failure Analysis of Adhesive Joint of Glass Fiber Reinforced Polymer Composite

The adhesive joint is the most widely used joining technique of thermoset composite structures. Analysis of the failure of adhesive joints of composite structures has a high importance due to its significance in industrial applications such as automobile or autobus bodies. In this paper we performed experimental and numerical analysis of a glass fiber reinforced, vinyl-ester matrix composite bonded with a methacrylate adhesive. The critical energy release rate in normal loading direction obtained from standard double cantilever beam test is used as input data in finite element simulations, in which the failure process is modeled by using cohesive zone material. Results of interface elements with exponential and standard contact elements with bilinear cohesive behavior are compared. The use of interface elements is numerically robust, convergence is reached faster, but identical mesh between the parts is needed. It can be a good alternative when simulating sub-models. When using standard contact elements, the robustness needs contact stabilization, however this method does not need identical mesh and it also allows the use of shell elements, therefore it can be used on a full-structure scale with high efficiency

OPTIMAL DYNAMIC PARAMETER SELECTION FOR A STOCHASTIC WHEEL SUSPENSION MODEL UPON PASSANGER'S COMFORT

The object of the paper is to provide a method which is able to design optimal dynamic parameters for car suspension systems. The mechanical model is a two-degree-of-freedom damped system which is excited by stochastic geometrical loading. The type of loading is a band limited (pink) noise generated by a realistic road surface. The model represents a wheel suspension system of a vehicle. The aim of the optimization is to define the road type-dependent damping and stiffness parameters of the suspension system which may provide the maximal passanger's comfort. The method is illustrated by a numerical example