56results about How to "Comprehensive calculation" patented technology

The invention discloses a frame structure optimizing method based on 3D printing. The frame structure optimizing method comprises the following steps that a, the stress and material attribute information of a frame is input according to design needs, and an initial frame model is constructed according to generative design; b, the initial frame model is subjected to degressive optimization based onan edge shrinkage algorithm with secondary errors as measurement cost, and a simplified frame model is obtained; c, a point set is distributed in the simplified frame model, all points in the point set are connected, then the points high in distribution manner and connecting manner efficiency in the point set are calculated and reserved based on a multi-objective optimization algorithm, the redundant points are deleted, and a frame optimization model is obtained; and d, the radius of a finished pipe is input, the structure in the frame optimization model becomes a volume from a line, and a frame 3D printed model is generated. The frame structure optimizing method has the advantages of reducing the printing material utilization quantity and being low in cost and good in structural strength.

The invention discloses a wireless sensor network clustering method based on Sink trust value evaluation. The problem that a wireless sensor network in the prior art is insufficient in safety control and energy consumption balance refining and high in network node resource requirement is mainly solved. The wireless sensor network clustering method comprises the steps that 1 node statistic and interaction situation of neighbor nodes are obtained; 2 Sink nodes evaluate trust values of all nodes according to the interaction situation sent by the modes; 3 the Sink nodes select new clustering heads according to the trust value evaluation; 4 the residual non-cluster-head nodes select clusters according to communication expenditure. The wireless sensor network clustering method comprehensively considers clustering network safety and simple demand, improves the overall energy balance of a network, prolongs the life cycle of the network, improves the safety of the network and reduces network node cost.

The invention relates to a computing method of unbalancedness of multi-circuit power transmission lines on the same tower. The method comprises the steps of computing the initial impedance and admittance matrix of each line according to the conductor type, conductor division method, pole and tower type and lightning conductor connecting method of each power transmission line; selecting electric parameters and building a model of the multi-circuit power transmission lines on the same tower based on computing results in the PSCAD / EMTDC environment; setting a short circuit and an open circuit of the tail end of each power transmission line, computing the current value of the short circuit of the tail end of each power transmission line and the current value of the open circuit of the tail end of each power transmission line, and obtaining sequence components of the current of the short circuit of the tail end of each power transmission line and the open circuit of the tail end of each power transmission line by means of the symmetrical component method through conversion; computing the electromagnetism and static electricity unbalancedness of the multi-circuit power transmission lines on the same tower based on the sequence components of the current of the short circuit of the tail end of each power transmission line and the open circuit of the tail end of each power transmission line. The computing method of the unbalancedness of the multi-circuit power transmission lines on the same tower is capable of computing the unbalancedness of the multi-circuit power transmission lines on the same tower comprehensively, accurately and conveniently and provides theoretical guidance for optimal design and operation of the multi-circuit power transmission lines on the same tower with different voltage classes, different pole and tower types and different phase sequence arrangement methods.