32 results about "Cone programming" patented technology

The invention relates to a target direction voice detection method based on second-order cone programming, comprising the following steps: designing the beamforming of the lowest sidelobe for the target direction, and calculating the weight of the beamforming of the lowest sidelobe by using the second-order cone programming; constructing Noise estimation weight; Estimate the target signal and noise signal; Calculate the power of the target signal and the noise signal by using the first-order recursive smoothing in the time domain; Use the power of the target signal and the power of the noise signal to calculate the posterior signal-to-noise ratio; The minimum value tracking of the posteriori signal-to-noise ratio is carried out to obtain the minimum value of the posteriori signal-to-noise ratio; the sum of the posteriori signal-to-noise ratio and the minimum value of the posteriori signal-to-noise ratio in the frequency range of 281.25Hz to 3437.5Hz are calculated and the ratio of the sum; judging the magnitude of the ratio and the set threshold to determine whether the voice in the target direction exists. The detection method of the present invention has the advantages of fewer steps and less calculation amount, and the problem of instability of some frequency points can be avoided through frequency domain summation.

The invention relates to an active power distribution network optimization operation method based on an improved information gap decision theory. The method comprises the following steps: 1) establishing an active power distribution network optimization operation model based on the improved information gap decision theory; 2) by introducing variables, converting the active power distribution network optimization operation model into a mixed integer second-order cone model; 3), adopting the Epsilon-relaxation method to perform polyhedral approximation description of the convex second-order cone, and converting a mixed integer second-order cone programming model into a mixed integer linear programming model. Compared with the prior art, the method has the advantages that the method is rapidand reliable, the economical efficiency is high, the uncertainty of wind, light and charge is comprehensively considered, and the enthusiasm of users for participating in the optimized operation of the active power distribution network is improved.

The invention discloses a topology optimization method for isotropic materials based on second-order cone programming. The method takes Young's modulus E and Poisson's ratio v of isotropic materials as design variables, and performs singular value decomposition on the unit stiffness matrix. Construct a new decomposition representation of the stiffness matrix; and map the original design variables (E,v) to a new set of design variables (P,Q) through a bijective function, take (P,Q) as the design variables, and convert the original The topology optimization problem is transformed into a second-order cone programming problem, so as to obtain the global optimal (P, Q) solution, and obtain the corresponding optimal Young's modulus and Poisson's ratio through the bijective function; for any given target material category, the continuous solution is hierarchically clustered in (P,Q) space to obtain a high-fidelity discrete solution. By transforming the topology optimization problem of free isotropic materials into a second-order cone programming problem, the method of the invention can theoretically ensure the optimal solution of the problem and can obtain high-fidelity discrete solutions under any specified number of materials.

The present invention relates to a method for evaluating the dynamic characteristics of an intraluminal artery stent based on second-order cone programming, comprising the following steps: step S1: performing automatic detection of arterial stent markers; step S2: performing arterial stent marker matching; The planning method performs three-dimensional reconstruction on the arterial stent marker; step S4: evaluating the dynamic characteristics of the arterial stent. The present invention studies the three-dimensional motion characteristics of the intracavity stent through systematic and rigorous analysis, establishes a mechanical dynamic characteristic model of the intracavity stent, obtains the evaluation of the dynamic characteristics of the intracavity stent, and expects to discover defects and failures of the stent itself early.

The invention provides a distributed power supply local voltage control strategy setting method based on cone programming. An active power distribution system structure and parameters are inputted according to a selected active power distribution system; the sequential characteristics of distributed power supply output and load are considered according to the active power distribution system structure and parameters, and an active power distribution network distributed power supply local voltage control strategy setting model is established; the objective function in the model is linearized, and linearization or cone conversion is performed on the nonlinear constraint so that the active power distribution network distributed power supply local voltage control strategy setting model is enabled to be converted into a second-order cone model; the second-order cone model is calculated by using a mathematical solver solving second-order cone programming; and the solving result is outputted, including the relevant parameters of the distributed power supply local voltage control strategy, the voltage distribution situation of the distributed power supply, the reactive compensation situation and the active reduction situation. The distributed power supply local voltage control strategy can be obtained so that the setting problem of the distributed power supply local voltage control strategy under continuous time sequences can be solved.