Netting analyses

Continuous reinforced filaments should be used to develop an efficient high-strength to low-weight FW structure. Structural properties are derived primarily from the arrangement of continuous reinforcements in a netting analysis system in which the forces, owing to internal pressure, are resisted only by pure tension in the filaments (applicable to internal-pressure systems). 

There is the ovaloid netting system that is the natural result of the reversal of helical windings over the end of the vessel. The windings 

In the application of bidirectional patterns, the end domes can be formed by fibers that are laid down in polar winding patterns. The best geometrical shape of the dome is an oblated hemispheroid. Theoretically, the allowable stress level in the two perpendicular directions should be identical. However, the efficiency of the longitudinal fibers is less than that of the circumferential fibers. It is possible to estimate an optimum or length-to-diameter ratio of a cylindrical case for a given volume. 

The filament-wound sphere design structure provides another example of a balanced netting analysis system. It is simpler in some respects than the closed-end cylinder. The sphere must be constructed by winding large circles omni-directionally and by uniform distribution over the surface of the sphere. In practice, distribution is limited so that a small polar zone is left open to accommodate a connecting fitting. 

The term isotensoid identifies a pressure vessel consisting entirely of filaments that are loaded to identical stress levels. The head shape of an isotensoid is given by an elliptical integral, which can most readily be solved by a computer. Its only parameter is the ratio of central opening 

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Peters, Humphrey, and Floral [5] describe netting analysis and provide analysis examples for pressure vessels and geodesic dome contours. Several design considerations are outlined in this reference ... 

Physical Approaches. Groundwater-exchange rates with lakes are traditionally estimated by careful measurements of hydraulic potentials within the groundwater system, followed by application of Darcy s law in the form of flow-net analysis or numerical modeling. However, these measurements can be time-consuming and costly, and can require monthly to weekly measurements at many piezometers to examine the three-dimensional nature of the hydraulic-potential field. In addition, characterization of the hydraulic conductivity of the aquifer is critical to physical approaches and typically leads to results with large uncertainties (I, 2). 

Netting analysis The analysis assumes that all stresses induced in the RP structure are carried entirely by the filaments and the strength of the plastic is neglected. Also assumes that the filaments possess no bending or shearing stiffiiess and carry only the axial tensile loads. 

From here we start our different interpretations leading to difapproaches for the problem of net-analysis, a few of which are presented here. 

In many (especially practical) applications the latter proved to be an approach of powerful potentials in solving net-analysis problems of high complexity. 

Magott, X, Skrobanek, P. 2002, Method of Time Petri Net Analysis for Analysis of Fault Trees with Time Dependencies. lEE Proceedings - Computers and Digital Techniques, Vol. 149, No. 6, 257-271. 

Netting analysis n. The stress analysis of filament-wound structures that neglects the strength of the resin and assumes that the filaments carry only axial tensile loads and possess no bending or shearing stiffiiess. 

These two formalisms for discrete event system models can be converted in between. This allows using the theory and tools developed to Petri Nets analysis (Fig. 7). 

Boerrigter, S.X. M., Grimbergen, R. F. P, and Meekes, H. 2001. FACELIFT-2.50, a program for connected net analysis Department of solid state chemistry. University of Nijmegen, The Netherlands. 

The prediction of composite strength is far less developed than the prediction of stiffness. Nevertheless, a reasonable first approximation has been obtained by using the old-fashioned netting analysis. The axial strength of an aligned com-... 

Disregarding this set of hurdles, a second-level net analysis should give us a good tool for envisaging both the structure and the forces that are crucial for its formation. 

Using Petri-Net analysis for advanced reliability analysis of polymer electrolyte membrane fuel cells... 

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