33results about How to "Ease of design optimization" patented technology

The invention discloses a broadband frequency selector and mainly solves the problems in the prior art that the unit size is large and the performance is poor during the large-angle incidence of an electromagnetic wave. The broadband frequency selector comprises a metal layer (1) and a medium layer (2), wherein the metal layer is positioned on the medium layer and consists of N hexagonal units (11) which are periodically arranged according to a triangular grid; N is more than or equal to 3; each unit comprises a regular hexagon metal patch (111) and a regular hexagon metal wire frame (112) at the periphery of the regular hexagon metal patch (111) and a regular hexagon gap (113) is arranged between the metal patch and the corresponding metal wire frame; an H-shaped gap (114) is vertically etched in the center of each edge of each regular hexagon gap; the H-shaped gaps are of the same size; and each H-shaped gap comprises two vertical seams of the same size and a horizontal gap which is sandwiched between the two vertical seams. The broadband frequency selector can maintain the stability of a central frequency point and high frequency selection characteristic during the incidence of the electromagnetic wave at an angle of 0 to 70 DEG, has the advantages of broad working frequency band, low loss, simple structure and easiness in implementation, and can be applied to radar domes and parabolic antennae.

The invention discloses an analysis of alloy semi-solid rheological deformation and a rheological deformation numerical simulation method. The model is simple, accurate and has few parameters, and can accurately reflect the temperature when the solid phase ratio of metal semi-solid slurry is less than 70% ( The relationship between solid phase ratio)-shear rate-viscosity accurately reflects the dynamic change of viscosity in the shear process of non-Newtonian fluid flow. The viscosity model is coupled with the basic equations of fluid mechanics and flow to establish a mathematical model of metal rheological deformation process, which can be used for numerical simulation of metal semi-solid rheological deformation, and can not only accurately obtain the flow characteristics of semi-solid slurry during rheological deformation , filling and solidification rules and defect prediction, and is conducive to the optimization of forming process and mold design, and has a good guiding role in the precise control of the whole process of semi-solid slurry preparation, transportation and rheological deformation.

The invention discloses a calculation method of safety thickness of supporting layers of pile foundations of karst areas. The calculation method comprises the following steps: step 1, establishing an assumed model, and simplifying the model; step 2, performing theoretical analysis on the safety thickness of the supporting layers; step 3, performing preliminary checking calculation on the safety thickness of the supporting layers; step 4, performing accurate checking calculation on the safety thickness of the supporting layers; step 5, judging whether the supporting layers satisfy calculation requirements. The calculation method disclosed by the invention is simple in calculation, facilitates design optimization of pile foundations, and is high in operability; in addition, through the adoption of the calculation method, the improvement of relevant norms is promoted, so that huge economic benefits and social benefits can be brought.

The invention relates to a parameter optimization method based on Pareto optimality under the condition of dual-mode configuration and multi-objective, belonging to the field of new energy vehicles. The method includes: S1: Constructing the steady-state dynamic equations in different configuration modes of the dual-mode configuration and the mode switching strategy based on maximizing transmission efficiency; S2: Constructing the transient dynamic equations of the hybrid power transmission system taking into account the moment of inertia of the components ; S3: Based on the dynamic programming algorithm, the economic evaluation index including the economic cost related to the working condition and the cost of the transmission system components, as well as the dynamic evaluation index quantified by the acceleration time of 100 kilometers are constructed; S4: Constructed by Chebyshev's aggregation method The multi-objective optimization function, based on the multi-objective evolutionary algorithm MOEA / D, obtains the optimal Pareto frontier of the relevant economic cost of the dual-model configuration, the cost of the power transmission system components, and the dynamic performance with the acceleration performance as the evaluation index. The invention provides wider design space for configuration optimization.

The invention provides a reversing valve, comprising: a body, a first connecting pipe to a sixth connecting pipe, a first slider and a second slider, a first partition and a second partition, and a control member. The reversing valve of the present invention can conveniently switch the six connecting pipes between the 2, 2, 2 communication mode and the 3, 3 communication mode. Compared with the scheme of using two four-way valves in the prior art, it can To achieve the same effect, but for the air conditioning system, after using one reversing valve instead of two four-way valves, the pipeline is simplified, which is convenient for pipeline design, frees up space, ensures the installability of the compressor, and facilitates further design optimization. Reduce valve and piping costs, especially in air conditioning systems including double suction compressors.

The invention provides a method for constructing a mechanical model of the force transmission mechanism of the prestressed anchor cable when the anchorage section passes through double strata, and makes rational assumptions about the actual working state of the prestressed anchor cable; Classification; establish the equilibrium differential equation of the prestressed anchorage section in all elastic stages; deduce the shear stress distribution function and the range of pull-out force of the prestressed anchorage section in all elastic stages; deduce the partial yield in the first stage The distribution function of the shear stress and the range of the pull-out force in the anchorage section of the prestressed anchor cable; the distribution function of the shear stress and the range of the pull-out force in the anchorage section of the prestressed anchor cable during the second stage of partial yielding; The shear stress distribution function and the range of the pull-out force of the anchorage section of the prestressed anchor cable; the derivation of the shear stress distribution function and the range of the pullout force of the anchorage section of the prestressed anchor cable at the full yield stage; the derivation of the prestress when the anchorage section passes through the double formation The ultimate bearing capacity of the anchor cable.

The invention belongs to the technical field of controllers and particularly discloses an active disturbance rejection control method based on a fractional order extended state observer. The method comprises the following steps: S1, comparing an input reference signal with a system output signal to obtain a system error; S2, taking the system error as an input signal of a proportional controller to obtain a system control rate; S3, taking a controlled object as a purely fractional integral transfer function as shown in the description, taking a part except the transfer function as shown in thedescription in the controlled target as disturbance, and observing the disturbance through the fractional order extended state observer to obtain an observation value of the disturbance; and S4, estimating the disturbance to obtain gain estimation of the controlled object, carrying out real-time compensation on the disturbance according to the control rate and the observation value of the disturbance to obtain the stable controlled object. The fractional order active disturbance rejection control method has better robustness on a control parameter, also has good robustness on system gain change, and has better capability of resisting noise interference.

The invention discloses a measuring instrument, which relates to the field of measuring equipment. The measuring instrument comprises: a frame; a first sliding part, which is movably arranged on the frame, and the first sliding part can move along a first direction; The second sliding part, the second sliding part is movably arranged on the first sliding part, and the second sliding part can move along the second direction, and the second direction is perpendicular to the first direction; the grip part, the grip part can move is arranged on the second sliding part, the holding part can move along the third direction, the third direction is perpendicular to the first direction and the second direction, and the holding part has an interface of the product to be tested, and the interface of the product to be tested is connected to the The operating parts of the product are connected; the force sensor is arranged on the interface of the product to be tested; and at least three speed measurement components are adapted to measure the speed of the first sliding part, the second sliding part and the gripping part respectively. The present invention aims to provide a measuring instrument that can measure the parameters of the force of the user using a consumer grade product.

The present invention provides an air conditioning system capable of switching between cooling and heating, comprising: a reversing valve, a compressor, a first indoor unit, a second indoor unit and an outdoor unit. The reversing valve in the air conditioning system of the present invention can conveniently switch the six connecting pipes between the 2, 2, 2 communication mode and the 3, 3 communication mode, which is similar to the scheme of using two four-way valves in the prior art The same effect can be achieved, but for the air-conditioning system, after using one reversing valve instead of two four-way valves, the pipeline is simplified, it is convenient for pipeline design, frees up space, and can ensure the installability of the compressor, which is convenient for further Design optimization reduces valve and piping costs, especially for air conditioning systems including double suction compressors.