2 results about "Substitution method" patented technology

The invention relates to the technical field of acoustic engineering, in particular to an equivalent substitution method and system for sound propagation analysis of a volume sound source in a complex sound field environment. The method comprises the following steps: establishing a finite element model of a volume sound source containing complex boundary conditions by utilizing engineering software, carrying out truncation processing on a computational domain, and calculating and obtaining sound pressure and normal vibration velocity on a closed integral surface surrounding the volume sound source; based on the sound pressure and the normal vibration velocity, performing external sound field solution on the closed integral surface by adopting a free field sound radiation integral mode to obtain sound pressure distribution on at least two layers of enveloping surfaces located on the outer side of the volume sound source; arranging a plurality of equivalent point sound sources in the volume sound source, constructing an equivalent source solution equation by taking the sound pressure on at least two layers of envelope surfaces as a matching target, and calculating the source intensity of each equivalent point sound source; and based on the positions of the equivalent point sound sources and the corresponding source intensities of the equivalent point sound sources, accumulative calculation of the volume sound sources in a complex sound field environment is realized by adopting a channel propagation method based on the point sound sources, so that propagation analysis is carried out.

The application discloses the technical field of integrated energy system operation and planning, and relates to a kind of energy system multi-energy flow calculation method, device and storage medium based on topological partition, method includes: to the each subsystem of pre-constructed IES mathematical model is topologically partitioned, each subsystem is decomposed into only containing radial subnetwork topology or ring subnetwork topology minimum sub-block;Determine the connecting node of adjacent sub-block and aggregate to form equivalent topology;Each described sub-block is set to balance node, with balance node as reference, based on the subnetwork topology type of equivalent topology, radial subnetwork topology adopts forward-back substitution method to solve sub-block multi-energy flow, and ring subnetwork topology adopts finite element method to solve sub-block multi-energy flow;Based on the state quantity of the connecting node, the calculation results of each sub-block are mapped to original IES topology according to preset rule, and multi-energy flow calculation result is output.The application can alleviate the technical problems that existing technology cannot meet the calculation requirements of complex mixed topology IES.