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By Committee on Application of Expert Systems to Materials Selection During Structural Design, Commission on Engineering and Technical Systems, National Research Council

The choice of the right kind fabrics for a structural part is a severe task that's ruled via many, frequently conflicting components. Incorporating fabrics professional structures into CAD/CAM operations may help designers through suggesting power production procedures for specific items to facilitate concurrent engineering, recommending quite a few fabrics for a selected half according to a given set of features, or presenting attainable differences of a layout if compatible fabrics for a specific half don't exist. This publication stories the structural layout technique, determines the weather, and services required for a fabrics choice professional process to help layout engineers, and recommends the components of specialist method and fabrics modeling learn and improvement required to plot a materials-specific layout procedure.

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Hs: Hss Table 2. 0 Table 3. Effect of the extra degree offi'eedom on the operation cost. 591 5. C o n c l u s i o n s Any HEN having nh active heaters and nc active coolers, which operates under optimal heat integration, may have an extra degree of freedom when nh > nc +2, or when nc > nh +2. The reference to active service units emphasizes that this additional optimisation space may turn on and off depending on the operating condition. The immediate consequence of this finding is that the problem formulation for HEN online optimisation has to be adapted to effectively address the minimum utility cost objective.

KttF . ) dr I .... R) MR (3) y__L_~=F,. ,~ _ 0 X--L-~= 0 dr I dr I dr~ Note that not all the nontrivial algebraic equations that correspond to the equilibrium of the fastest dynamics are linearly independent. Specifically, the last three nontrivial equations can be expressed as functions of the first three. This implies that the steadystate condition associated to the fastest dynamics does not specify isolated equilibrium points, but rather a six-dimensional manifold in which a slower dynamics evolves Also, note that the control objectives in this time scale must be addressed using the large inputs u 1, as the inputs u' and d' have no effect on the fastest dynamics.

To determine when these characteristics are present, let us analyse first the relationships describing the tasks to be accomplished on each process stream with a temperature target. To reach the temperature target a hot process stream i has to release the energy Qi and a cold process stream j has to receive the energy Q;. These energies are released and received through different process-to-process exchanges q~ and service tasks qci and qhj along each stream path, namely Q~=-~-'~qk-qc,, ieH, Q/- kcK i ~~qk +qhj, j~C (1) kEKj where H stands for all the hot streams, C represents all the cold streams, and Ki and Kj are the subset of heat-exchangers on streams i and j respectively.

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