scholarly journals METHOD OF STRUCTURAL SYNTHESIS OF RECEIVING AND TRANSMITTING RADIO DEVICES BLOCK SCHEMES

T-Comm ◽  
2020 ◽  
Vol 14 (10) ◽  
pp. 4-16
Author(s):  
Rustam R. Vishnyakov ◽  
Keyword(s):  
Optimization Method ◽  
Exhaustive Search ◽  
Input Circuit ◽  
Electronic Components ◽  
Structural Element ◽  
Scheme Design ◽  
Block Scheme ◽  
Optimization Function ◽  
Convolution Method ◽  
Receiving Module

This paper is devoted to development of an algorithm for the synthesis of receiving and transmitting radio devices block schemes. Based on the presented algorithm, it is possible to develop a program that implements automated circuit synthesis. Such a program allows to a developer to obtain the most optimal scheme in the class of Pareto-optimal solutions. The algorithm is based on the method of exhaustive search of structural and elemental designs, and the decision-making method based on the criteria convolution method. The application of the exhaustive search of possible structural-element designs method allows creating a complete set of implementations and thus making choice decision of a scheme according to certain criteria among all possible constructions. This allows asserting the optimality of the obtained solutions, selected from a complete ensemble of possible designs. The use of the vector optimization method to select the optimal structural block scheme design of receiving and transmitting radio devices allows determining the most optimal construction according to the criterion for the highest value of the optimization function formed by the criteria convolution method. In the paper also considered a practical example of the synthesis of the input circuit of the receiving module RF part. As an example, the task of change the electronic components of the input part of the receiving module RF part with alternative microcircuits is given. To solve the described problem, a program was developed in the MATLAB. The results of the program are also given in the paper. The effectiveness of the developed algorithm and method for solving the task of synthesizing a block scheme from an elemental base represented by modern electronic components and circuit solutions is shown. Recommendations on further promising application of the proposed algorithm and method are presented.

Optimal Model Reference Control Scheme Design for Nonlinear Strict-Feedback Systems

2020 ◽  
Vol 38 (9A) ◽  
pp. 1342-1351
Author(s):  
Musadaq A. Hadi ◽  
Hazem I. Ali
Keyword(s):  
Reference Model ◽  
Feedback System ◽  
Optimization Method ◽  
Feedback Systems ◽  
Model Reference ◽  
Scheme Design ◽  
Model Reference Control ◽  
Control Scheme ◽  
Lyapunov Stability Analysis ◽  
Strict Feedback

In this paper, a new design of the model reference control scheme is proposed in a class of nonlinear strict-feedback system. First, the system is analyzed using Lyapunov stability analysis. Next, a model reference is used to improve system performance. Then, the Integral Square Error (ISE) is considered as a cost function to drive the error between the reference model and the system to zero. After that, a powerful metaheuristic optimization method is used to optimize the parameters of the proposed controller. Finally, the results show that the proposed controller can effectively compensate for the strictly-feedback nonlinear system with more desirable performance.

Simplified Modeling Research of Reinforced Concrete Based on the Dynamic Stiffness Equivalence

2012 ◽  
Vol 446-449 ◽  
pp. 458-462
Author(s):  
Jie Hu ◽  
Jia Quan Feng ◽  
Xi Nong Zhang
Keyword(s):  
Reinforced Concrete ◽  
Reference Model ◽  
Dynamic Stiffness ◽  
Optimization Method ◽  
Simplified Model ◽  
Response Analysis ◽  
Reinforced Concrete Structure ◽  
Optimization Function ◽  
Nature Frequency ◽  
Simplified Modeling

This paper proposed a simplified modeling method of reinforced concrete based on the equivalence of dynamic stiffness, the parameters of simplified model were modified to make the error of nature frequency between reference model and simplified model as small as possible, and an appropriate optimization function was designed. The essentiality of the proposed method is parameter optimization, with the advantages such as fewer elements and calculation assumption. The numerical simulation result indicated that this optimization method is suitable for the dynamic response analysis of complicated reinforced concrete structure.

scholarly journals The Method of MMC Redundancy Optimization Allocation Based on Multi-objective Optimization

2018 ◽  
Vol 173 ◽  
pp. 03075
Author(s):  
Enshu Jin ◽  
Yagu Zhang
Keyword(s):  
Optimization Method ◽  
Normal Operation ◽  
Multi Objective Optimization ◽  
Configuration Optimization ◽  
Multi Objective ◽  
Optimal Value ◽  
Optimization Function ◽  
Multi Level ◽  
Optimization Allocation ◽  
Level Converter

When the modular multi-level converter of the sub-module faults, which will cause the unbalanced system, affect the normal operation of the system, so to the MMC arm configuration redundant sub-module is necessary, if the sub-module faults, redundant sub-modules will replace the fault sub-module maintaining the normal operation of system. In this paper, we propose a reasonable and effective method for the configuration optimization of redundant sub-module based on the three indexes, namely, efficient utilization of redundant sub-module, the number of redundant sub-module and the reliability of the system MMC, considering the three factors, establishing a multi-objective optimization function of redundant configuration, By calculating the optimal value to accurately calculate the number of redundant sub-module of MMC, based on the proposed redundancy configuration optimization method, building a simulation model of MMC 5 level in PSCAD, the results verify the rationality and feasibility of the proposed optimization method.

Research on Evolutionary Topology Optimization in ANSYS

2013 ◽  
Vol 572 ◽  
pp. 547-550 ◽  
Author(s):  
Dong Yan Shi ◽  
Jia Shan Han ◽  
Ling Cheng Kong ◽  
Lin Lin
Keyword(s):  
Topology Optimization ◽  
Optimization Method ◽  
Secondary Development ◽  
Filter Method ◽  
Ansys Software ◽  
Evolutionary Structural Optimization ◽  
Elemental Sensitivity ◽  
Beso Method ◽  
Optimization Function ◽  
2D And 3D

Topology optimization function in ANSYS software is inefficient with the limitation of element types. By using the secondary developing language APDL and UIDL, the secondary development of bi-directional evolutionary structural optimization (BESO) method with volume constraint and stiffness maximization is completed in ANSYS. To suppress the checkerboard patterns, the elemental sensitivity numbers are recalculated by a filter method. To ensure the convergence of the optimization method in ANSYS, the elemental sensitivity numbers are updated by adding in their historical information. Two classic numerical examples are calculated to obtain the best topology structure. The numerical results indicate that the secondary method can solve the 2D and 3D problems effectively, which makes up for the deficiency of topology optimization part in ANSYS and broadens the application scope of the evolutionary optimization method.

scholarly journals Segmentation of Meristem Cells by an Automated Optimization Algorithm

2020 ◽  
Vol 10 (23) ◽  
pp. 8523
Author(s):  
Oswaldo Rojas ◽  
Manuel G. Forero ◽  
José M. Menéndez ◽  
Angharad Jones ◽  
Walter Dewitte ◽  
...  
Keyword(s):  
Level Set ◽  
Automatic Segmentation ◽  
Optimization Method ◽  
Intensity Level ◽  
Low Contrast ◽  
Segmentation Methods ◽  
Segmented Images ◽  
Optimization Function ◽  
Confocal Images ◽  
Automated Optimization

Meristem cells are irregularly shaped and appear in confocal images as dark areas surrounded by bright ones. Images are characterized by regions of very low contrast and absolute loss of edges deeper into the meristem. Edges are blurred, discontinuous, sometimes indistinguishable, and the intensity level inside the cells is similar to the background of the image. Recently, a technique called Parametric Segmentation Tuning was introduced for the optimization of segmentation parameters in diatom images. This paper presents a PST-tuned automatic segmentation method of meristem cells in microscopy images based on mathematical morphology. The optimal parameters of the algorithm are found by means of an iterative process that compares the segmented images obtained by successive variations of the parameters. Then, an optimization function is used to determine which pair of successive images allows for the best segmentation. The technique was validated by comparing its results with those obtained by a level set algorithm and a balloon segmentation technique. The outcomes show that our methodology offers better results than two free available state-of-the-art alternatives, being superior in all cases studied, losing 9.09% of the cells in the worst situation, against 75.81 and 25.45 obtained in the level set and the balloon segmentation techniques, respectively. The optimization method can be employed to tune the parameters of other meristem segmentation methods.

Offshore Platform Topsides Structural Design: Using Topology Optimization to Generate Novel Design Concept

2021 ◽  
Author(s):  
Zhongwei Li ◽  
Aimin Wang ◽  
Jonathan Wang ◽  
Otto Dasilva
Keyword(s):  
Topology Optimization ◽  
Structural Design ◽  
Strength Criterion ◽  
Optimization Method ◽  
Offshore Platform ◽  
Structural Element ◽  
Structural Shape ◽  
Ocean Environment ◽  
Geometric Arrangements ◽  
Novel Design

Abstract The paper presents topology optimization performed for the concept study of a semi-submersible platform topsides structure. The topsides truss system consisting of I beams carries the equipment payload and the environment loads. The structural weight needs to be reduced in order to maximize the allowable equipment weight, and the structural strength criterion must be satisfied for the harsh ocean environment. Topology optimization is a powerful tool to generate designs that optimally distribute the structural material for the balance between structural weight and strength. A finite-element-based topology optimization method assigns a density value to each structural element and updates this density value using topology optimization algorithms during each design iteration. Elements in the load-transferring path retain high density value at the end cycle and form an efficient structural shape under the given design load conditions and constraints. The topology optimization generated novel and optimal geometric arrangements for the topsides structure. Two corresponding innovative topsides truss concepts were developed. The new topsides designs were compared with an existing benchmark design for the structural weight and strength to demonstrates the advantages of topology optimization over conventional empirical approach for offshore platform topsides structural design. At the same strength level, the novel designs reduced the structural weight significantly. One novel design was selected for practical semi-submersible designs at Exmar Offshore Company.

Optimization of Stamping Parameters Using Stochastic Focusing Search Algorithm

2012 ◽  
Vol 479-481 ◽  
pp. 1963-1967
Author(s):  
Ling Long ◽  
Chao Song ◽  
Guo Fu Yin
Keyword(s):  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Optimization Design ◽  
Search Algorithm ◽  
Optimization Procedure ◽  
Optimization Method ◽  
Forming Process ◽  
Metal Forming Process ◽  
Optimization Function

A new kind of swarm intelligence algorithm called stochastic focusing search(SFS) is proposed and applied to optimize sheet metal forming process in this paper. The steps of the optimization procedure include combining numerical simulation technology with orthogonal experiments to provide training samples for BP net, and producing the fitted function as optimization function for SFS algorithm. The validation of the final optimization results by a rectangular box part stamping case shows that this kind of optimization methodology is correct and reliable for the design of deep drawing process. Advantages of the SFS algorithm are demonstrated that SFS has good global searching ability and fast convergence speed in finding optimal solutions, which means the optimization method using SFS algorithm can provide a competitive way of solving the optimization design problems in sheet metal forming.

Trajectory Optimization Method for Follow-Up Control of Concrete Pump Truck

2013 ◽  
Vol 415 ◽  
pp. 3-8
Author(s):  
Da Wei Huang ◽  
Bai Yan Liu ◽  
Ru Wei Zhang
Keyword(s):  
Working Conditions ◽  
Trajectory Optimization ◽  
Optimization Method ◽  
Inverse Kinematic ◽  
Constrained Nonlinear Optimization ◽  
Optimization Function ◽  
Minimum Displacement ◽  
Concrete Pump Truck ◽  
Concrete Pump

The follow-up control of concrete pump truck is in order to solve the problem that whole boom follows the movement of boom end under the artificial traction. Focus on real-time detection of boom end azimuth change and inverse kinematic problems of redundant boom system, two-axis gravitational accelerometer is used to detect azimuthal variation of boom end, and the best motion trajectory of boom is determined by solving constrained nonlinear optimization function which takes minimum displacement distance of barycentre for the whole boom as the optimization goal. At last, relative azimuth and translation of boom end, rotation of boom are solved together to make translation and rotation of boom being synchronization. In this way to ensure whole boom follows the artificial traction in theory. In order to verify the discussion above, matlab is used to simulate several different working conditions for the follow-up control of boom.

scholarly journals Seismic Design Optimization Method of Fire Hydrants

2021 ◽  
Vol 21 (2) ◽  
pp. 81-90
Author(s):  
Heunggyoo Oh ◽  
Sehong Min
Keyword(s):  
Seismic Design ◽  
Fire Protection ◽  
Fire Risk ◽  
Optimization Method ◽  
Structural Safety ◽  
Design Code ◽  
Structural Element ◽  
Richter Scale ◽  
Seismic Design Code ◽  
Earthquake Load

As per the revisions to the Korean Building Code and the Seismic Design Code for fire protection systems in accordance with the Common Applications of the Seismic Design Code by the Ministry of the Interior and Safety, earthquake load and structural safety of a non-structural element are considered as important parameters for a fire protection system. In Richter scale 5.0 or higher earthquake damage cases occurring in Gyeongju (2016) and Pohang (2017), walls and hydrant boxes were broken or deformed such that their doors could not be opened. Therefore, the breakage, deformation, and detachment of hydrants and internal devices without the seismic design caused malfunction and increased the fire risk. In this study, the earthquake load was calculated according to the seismic design regulation on the hydrant box and the structural stability was verified by 3D model review, structural analysis simulation, the structural member, and the anchorage for performance. Moreover, an optimized seismic design plan was proposed by analyzing and comparing the simulation result for the factors governing the seismic design performance of a fire hydrant box.

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