AZIM, G. A., ATTIA, H. A.: Neural networks construction application to the kinematical analysis of the five-point suspension 1 SEENI KANNAN, P., PERIASAMY, V. M., NAGARAJ, P.: Design strategy for six-cylinder stationary diesel engine exhaust systems 13 MURČINKOVÁ, Z., KOMPIŠ, V.: Advanced modelling of short-fibre reinforced composites 27 RAO, A. CH., SRINATH, A.: Allocation of joint backlashes in manipulator linkages with emphasis on platform-type robot 41 Letter to the Editor SUDHAKAR, A. V., RAJU, V. R. CH., MURTHY, V. B. K., RAO, K. M., KUMAR, M. S. R. N.: Study of thermoelastic behaviour of skew laminated composite plate with circular cutout using finite element method 53
GAMIL A. AZIM, HAZEM A. ATTIA
In this paper, a General Neural Networks Regression (GNNR) is presented. The position analysis of multi-link five-point suspension system is solved using GNNR. The mechanism of wheel suspension is a multi-body system (MBS) which is a system of bodies (in this case rigid links of given length) whose mutual position is bounded by geometrical constraints (joints) and by active kinematical driving constraints in the form of prescribed motion related to the degrees-of-freedom (DOF) of the given mechanism. GNNR is first trained with coordinates of the defined points and input driving variables. After training, performance is measured by having the network generate the coordinates of the defined points in terms of driving input variables. It is found that GNNR provides a simple and effective way to model the spatial kinematics of the five point's suspension and eliminate the convergence problems associated with algorithmic solution methods.
PAULDURAY SEENI KANNAN, VELAYUTHAMPALAYAM MUNIAPPAN PERIASAMY, PERIA SAMY NAGARAJ
Overall engine performance of an engine can be obtained from the proper optimized design of engine inlet and exhaust systems. This paper presents the influence of an exhaust manifold pressure on the performance improvement of a reciprocating four-stroke engine. The application of computational methods for the development of high performance of a four-stroke stationary engine has been evaluated. A one-dimensional fluid dynamic code has been employed to simulate engine performance at full load, and data predicted from computer simulation have been compared with experimental results. To do this aforementioned validation process, computer simulation techniques were applied to develop a new exhaust system so as to optimize volumetric efficiency over a wider range of speed. These techniques proved to be powerful and effective in identification of the modifications required to obtain the engine performance targets. Findings from these studies are used to derive exhaust system design guidelines that define the optimum exhaust system geometry to give effective scavenging and fine cylinder charging.
ZUZANA MURČINKOVÁ, VLADIMÍR KOMPIŠ
In this paper, a Method of External Finite Element Approximation\linebreak (MEFEA) to model such problems like composites reinforced by short fibres will be presented. MEFEA is an enhanced classic FEM with idea of external approximations. There are shape functions in the discrete solution space that do not belong to the infinite dimensional solution space. The domain is split in subdomains (cells) and the approximation is built on each of these subdomains independently of each other. The method is similar to Hybrid Trefftz Finite Element Method, where Trefftz functions are used inside each element (subdomain). The displacement and force boundary conditions are met only approximately whereas the governing equations are fulfilled exactly in the volume for linear elasticity, making it possible to assess accuracy in terms of error in boundary conditions. The main benefit is that the discretization can be done directly on a 3D CAD geometry with all details (features) for the analysis.
ATLURI CHAKRADHARA RAO, ADUSUMILLI SRINATH
Joint clearances in linkages and backlashes in gear trains lead to "position errors". Accuracy suffers if clearances and backlashes are allocated liberally while tighter allocation leads to higher manufacturing cost. Hence acceptable procedure is to allocate joint clearances or backlashes in such a way that the maximum position error is limited to a specified value. A simple method based on the concepts of parallelism and optimization is proposed. This method is extended to platform-type spatial robots.
SUDHAKAR, A. V., RAJU, V. R. CH., MURTHY, V. B. K., RAO, K. M., KUMAR, M. S. R. N.
The thermoelastic behaviour of a laminated composite skew plate with hole subjected to non-linear variation of temperature as well as combined temperature and transverse pressure loading has been investigated in the present analysis. The finite element method which works on the basis of three-dimensional theory of elasticity is employed to evaluate the transverse deflection and in-plane stresses. In most of the cases the magnitudes of the transverse deflection and in-plane stresses for combined loading are observed to be less at higher skew angles, because the distance between opposite sides of the plate decreases with increase in skew angle causing an increase in the stiffness of the plate.