scholarly journals Optimal Design of Pitched Roof Rigid Frames with Non-Prismatic Members Using Quantum Evolutionary Algorithm

2019 ◽  
Author(s):  
Hamed Arzani ◽  
Ali Kaveh ◽  
Mohammad Kamalinejad
Keyword(s):  
Optimal Design ◽  
Evolutionary Algorithm ◽  
Cross Section ◽  
Optimization Algorithm ◽  
High Speed ◽  
Binary Code ◽  
Search Space ◽  
Design Constraints ◽  
The Cross ◽  
Tapered Members

The weight and shape of the gable and multi-span frames (mono and two-span pitched roof) with tapered members, as a familiar group of the pitched roof frames, are highly dependent on the properties of the member cross-section. In this work a quantum inspired evolutionary algorithms, so-called Quantum evolutionary algorithm (QEA) [1], are utilized for optimal design of one gable frame and a multi-span frame in five alternatives with tapered members. In order to optimize the frames, the design is performed using the AISC specifications for stress, displacement and stability constraints. The design constraints and weight of the gable and multi-span frames are computed from the cross-section of members. These optimum weights are obtained using aforementioned optimization algorithm considering the cross-section of members and design constraints as optimization variables and constraints, respectively. A comparative study of the QEA and some recently developed methods from literature is also performed to illustrate the performance of the utilized optimization algorithm and its featuring. Furthermore, optimal design of a multi-span frame is compared with the solution of other methods including the same conditions and constraints. This study indicates the power of QEA in exploring and exploitation due the search space with using Q-gate and binary code for individual representation and updating. Binary code helps the QEA to find optimal solution even with minimum number of Q-bit individuals. High speed of this method is because of such a feature.

scholarly journals Optimal Design of Steel Curved Roof Frames by Enhanced Vibrating Particles System Algorithm

2019 ◽  
Author(s):  
Ali Kaveh ◽  
Seyed Rohollah Hoseini Vaez ◽  
Pedram Hosseini ◽  
Mohsen Bakhtyari
Keyword(s):  
Optimal Design ◽  
Cross Section ◽  
Slope Angle ◽  
Discrete Variables ◽  
Factors Affecting ◽  
Two Factors ◽  
And Performance ◽  
Structural Loading ◽  
Tapered Members ◽  
Continuous And Discrete Variables

The paper presents an optimal design of steel curved roof frames with its roof being part of a circular arc. The elements of frames are tapered I-section members. In the objective function for optimization, two factors affecting the weight of frames are considered simultaneously. First, the roof slope angle as an effective variable on the values of the structural loading and second, the cross-section of members that are considered as continuous and discrete variables, respectively. In the range of 3 to 70 degrees, the optimum range of roof slope angles for steel curved roof frames, as well as precise value of the best roof slope angle, will be reported. Enhanced Vibrating Particles System (EVPS) algorithm is utilized for the optimal design of steel curved roof frames with tapered members. The performance and efficiency of the EVPS algorithm is compared with six other recently developed optimization algorithms including VPS, GWO, HS, SSA, ECBO and GOA algorithms. The effectiveness and performance of EVPS algorithm is proven. Frames design are performed using ANSI/AISC 360-05 specifications which strength, displacement and stability constraints are imposed on the frames.

scholarly journals Technology of Manufacturing of Disk Blanks to High-Speed Elements for Tests on Anti-Meteoroid Protection

2020 ◽  
Vol 35 ◽  
pp. 04013
Author(s):  
Pavel V. Kruglov ◽  
Irina A. Bolotina
Keyword(s):  
Cross Section ◽  
High Speed ◽  
Peripheral Region ◽  
Circumferential Direction ◽  
Third Harmonic ◽  
The Third ◽  
The Cross ◽  
Different Thickness ◽  
Metal Blank ◽  
Periodic Profile

In this paper, a variant of the manufacturing technology of the disk blank for the segment liner of the shape charge is proposed. The charges are used to test the anti-meteorite stability of spacecraft. The proposed method makes it possible to form a blank in which, as its thickness decreases from the center to the periphery, a periodic profile variable in thickness is formed simultaneously in the circumferential direction. The disk metal blank is fixed in a three-cam chuck and the end face of the disk is cut with a decrease in thickness along the generatrix from the center to the periphery. Under the action of fastening forces, the disk blank is deformed and after processing the thickness in the cross section has a triangular periodic profile. Experiments on processing of disk preparations at various efforts of machine device are carried out. The dependences of the disc thickness on the fastening force in the device are obtained. After harmonic analysis of the thickness of the cross section, the values of the amplitudes of harmonics of different thickness in the circumferential direction at different distances from the center of the disk blank were determined. An increase in the fastening force leads to an increase in the amplitude of the third harmonic of the part thickness. It is shown that the change in the amplitudes of the first and second harmonics of different thickness is insignificant, and the amplitude of the third harmonic increases from the center to the periphery, which is caused by a decrease in the stiffness of the workpiece in the peripheral region.

How to Achieve Artifact-Free FIB Milling on Polyimide Packages

2016 ◽  
Author(s):  
Tomáš Hrnčíř ◽  
Marek Šikula ◽  
Jozef Vincenc Oboňa ◽  
Pascal Gounet
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
High Speed ◽  
Section Plane ◽  
Simple Method ◽  
Site Specific ◽  
Standard Procedures ◽  
Protection Layer ◽  
The Cross

Abstract High speed FIB cross-sectioning of polyimide material was traditionally very difficult because of artifacts created by FIB on the cross section plane. Therefore we propose a simple method, which retains the high speed of the FIB process, but significantly improves the quality of the cross section plane. The method involves a hard mask positioned close to the intended place of the cross section using a precise manipulator. This then enables highly accurate and site-specific FIB cross-sectioning. Cross sections can be made very quickly and with the excellent quality in comparison to standard procedures based on gas-assisted deposition of a protection layer.

OPTIMAL DESIGN OF THE CROSS SECTION IN A NUCLEAR REACTOR

1996 ◽  
Vol 16 (2) ◽  
pp. 229-233
Author(s):  
Degong Song ◽  
Weihua Jiang ◽  
Miansen Wang ◽  
Guangtian Zhu
Keyword(s):  
Optimal Design ◽  
Cross Section ◽  
Nuclear Reactor ◽  
The Cross

Influence of the Cross Section of Hood on the Compression Wave Generated by a High-Speed Train

2012 ◽  
Vol 256-259 ◽  
pp. 1365-1368
Author(s):  
Ya Guang Yan
Keyword(s):  
Pressure Gradient ◽  
Numerical Computation ◽  
Cross Section ◽  
Compression Wave ◽  
High Speed ◽  
Pressure Change ◽  
High Speed Train ◽  
Maximum Gradient ◽  
The Cross ◽  
Better Than

An analysis is made of the compression wave generated when a high-speed train enters a tunnel with hood. The purpose of the hood is to reduce as much as practicable the maximum gradient of the compression wave. In this paper the numerical computation simulates the pressure change in the tunnel,analysises regularity of the the initial compression wave and the pressure gradient wave,compares the mitigation effect of the two hoods which have different cross section on the pressure gradient.The following conclusions have been drawn from the research: The amplitude of the first compression wave is not significantly reduced with hood,however,the amplitude of the pressure gradient is significantly reduced with hood.And the mitigation effect of the enlarged-transect hood is better than the equal-transect one.

scholarly journals Design a project of sewage plant to make the cross-section water quality reach standard

2021 ◽  
Vol 252 ◽  
pp. 03038
Author(s):  
Lei Chao ◽  
Bingtao Liu ◽  
Yinzhe Liu ◽  
Yafeng Li
Keyword(s):  
Water Quality ◽  
Cross Section ◽  
High Speed ◽  
Stable Operation ◽  
Precipitation Reaction ◽  
Electricity Cost ◽  
Sewage Plant ◽  
Control Section ◽  
The Cross ◽  
Filtration Technology

According to regulations, the cross-section of Wangjiawopeng is regarded as a national control section of the Daling River. The water quality of the section must meet the surface water level III standard. According to the survey, the total phosphorus in the effluent from the sewage plant in Jianchang exceeds the standard is the main reason for the failure of the water quality. In order to make the cross-section water quality reaching standard, it is necessary to carry out the advanced treatment of phosphorus in the sewage plant. (1) The precipitation reaction of phosphorus and coagulant in sewage is strengthened by optimizing the type of coagulant, optimizing the dosage of coagulant, and selecting suitable coagulant aids. (2) The removal efficiency of phosphorus is improved by high-speed fiber filtration technology. (3) Phosphorus is removed by flocculation-sedimentation-high-speed fiber filtration technology. Experiments show that the SS in the sewage plant effluent is less than 5mg/L and filter effluent TP is less than 0.2mg/L. The process construction investment is estimated to be 3.9 million yuan, and the operating electricity cost is estimated to be 0.2 cents/m3. The process has the characteristics of reliable processing technology, stable operation, easy maintenance.

A New Approach to the Demonstration of Oxidase-Localization Using Tannic Acid Or Catechin

1973 ◽  
Vol 31 ◽  
pp. 698-699
Author(s):  
V. Mizuhira ◽  
Y. Futaesaku
Keyword(s):  
Cross Section ◽  
Tannic Acid ◽  
Elastic Fiber ◽  
The Other ◽  
New Approach ◽  
Tissue Block ◽  
Active Reaction ◽  
The Cross

Previously we reported that tannic acid is a very effective fixative for proteins including polypeptides. Especially, in the cross section of microtubules, thirteen submits in A-tubule and eleven in B-tubule could be observed very clearly. An elastic fiber could be demonstrated very clearly, as an electron opaque, homogeneous fiber. However, tannic acid did not penetrate into the deep portion of the tissue-block. So we tried Catechin. This shows almost the same chemical natures as that of proteins, as tannic acid. Moreover, we thought that catechin should have two active-reaction sites, one is phenol,and the other is catechole. Catechole site should react with osmium, to make Os- black. Phenol-site should react with peroxidase existing perhydroxide.

Energy Distribution in Electron Beams

1972 ◽  
Vol 30 ◽  
pp. 568-569
Author(s):  
Tamotsu Ohno
Keyword(s):  
Electron Beam ◽  
Energy Distribution ◽  
Cross Section ◽  
Integral Curve ◽  
Electron Beams ◽  
Electron Gun ◽  
Angular Divergence ◽  
Apparent Increase ◽  
Integral Width ◽  
The Cross

The energy distribution in an electron; beam from an electron gun provided with a biased Wehnelt cylinder was measured by a retarding potential analyser. All the measurements were carried out with a beam of small angular divergence (<3xl0-4 rad) to eliminate the apparent increase of energy width as pointed out by Ichinokawa.The cross section of the beam from a gun with a tungsten hairpin cathode varies as shown in Fig.1a with the bias voltage Vg. The central part of the beam was analysed. An example of the integral curve as well as the energy spectrum is shown in Fig.2. The integral width of the spectrum ΔEi varies with Vg as shown in Fig.1b The width ΔEi is smaller than the Maxwellian width near the cut-off. As |Vg| is decreased, ΔEi increases beyond the Maxwellian width, reaches a maximum and then decreases. Note that the cross section of the beam enlarges with decreasing |Vg|.

Sign in / Sign up

Export Citation Format

Share Document