scholarly journals STUDY ON ASSURANCE DESIGN METHOD OF CONNECTIONS AT THE BOTTOM OF COLUMNS IN WOODEN WALL STRUCTURE (PART 1): PROPOSAL OF DESIGN FLOW FOR CONNECTIONS AND EXPERIMENTAL AND ANALYTICAL STUDY ON THE MODELING OF VERTICAL STRUCTURAL PLANE

2022 ◽  
Vol 87 (791) ◽  
pp. 116-127
Author(s):  
Taro NAKA ◽  
Ryuki ODANI ◽  
Kenji AOKI ◽  
Masahiro INAYAMA
Keyword(s):  
Analytical Study ◽  
Design Method ◽  
Design Flow ◽  
Wall Structure ◽  
Structural Plane

Finite Element Analysis and Optimization of Long-Span Gantry NC Machining Center Structure

2011 ◽  
Vol 346 ◽  
pp. 379-384
Author(s):  
Shu Bo Xu ◽  
Yang Xi ◽  
Cai Nian Jing ◽  
Ke Ke Sun
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Design Method ◽  
Dynamic Performance ◽  
Plate Thickness ◽  
Element Model ◽  
Wall Structure ◽  
Characteristic Analysis ◽  
Element Analysis ◽  
Dynamic Performance Analysis

The use of finite element theory and modal analysis theory, the structure of the machine static and dynamic performance analysis and prediction using optimal design method for optimization, the new machine to improve job performance, improve processing accuracy, shorten the development cycle and enhance the competitiveness of products is very important. Selected for three-dimensional CAD modeling software-UG NX4.0 and finite element analysis software-ANSYS to set up the structure of the beam finite element model, and then post on the overall structure of the static and dynamic characteristic analysis, on the basis of optimized static and dynamic performance is more superior double wall structure of the beam. And by changing the wall thickness and the thickness of the inner wall, as well as the reinforcement plate thickness overall sensitivity analysis shows that changes in these three parameters on the dynamic characteristics of post impact. Application of topology optimization methods, determine the optimal structure of the beam ultimately.

Based on the Grey Relation Analysis of Ecological Composite Wall Seismic Performance Research

2013 ◽  
Vol 368-370 ◽  
pp. 1043-1047
Author(s):  
Yin Zhang ◽  
You Han ◽  
Shuai Liang
Keyword(s):  
Seismic Performance ◽  
Evaluation System ◽  
Design Method ◽  
Structure Design ◽  
Grey System Theory ◽  
Frame Structure ◽  
Wall Structure ◽  
Width Ratio ◽  
Grey System ◽  
Composite Wall

Ecological composite wall as ecological composite wall structure of the main stress components, the seismic performance is ecological composite wall structure seismic performance evaluation system of the main content. Based on the grey system theory, the grey correlation analysis to the key parameters (the mouth of the cave, frame structure, height to width ratio) change ecological composite wall test results are analyzed, the key parameters on the ecological composite wall the influence law of seismic performance, for choosing wall structure design method to provide basis.

Study on the Design Method of Deepwater Steel Lazy Wave Riser

2019 ◽  
Author(s):  
Zhao Wang ◽  
Wei Qin ◽  
Xiaojie Zhang ◽  
Jiannan Zhao ◽  
Yong Bai
Keyword(s):  
Oil And Gas ◽  
Design Method ◽  
Bending Moment ◽  
Design Criterion ◽  
Design Flow ◽  
Distribution Law ◽  
Gas Field ◽  
Field Development ◽  
Moment Distribution ◽  
Oil And Gas Field

Abstract The steel lazy wave riser has been used in deep-water oil and gas field development because it has good adaption to the movement of the upper platform and economic efficiency. The typical design criterion and design flow of steel lazy wave riser are introduced in this paper. The design method and the equivalence principle of distributed buoyancy modules are given. The formulas of equivalent hydrodynamic parameters are derived in this paper. The influences of distributed buoyancy modules (DBM) and the buoyancy factor on the configuration of the riser, the top tension, and the bending moment distribution are discussed and summarized. The distribution law of effective stress response along the pipe can be analyzed by dynamic analysis, and it provides reference for the global design of steel lazy wave riser.

UNIFICATION OF PR REGION FLOORPLANNING AND FINE-GRAINED PLACEMENT FOR DYNAMIC PARTIALLY RECONFIGURABLE FPGAS

2013 ◽  
Vol 22 (04) ◽  
pp. 1350020 ◽  
Author(s):  
RUINING HE ◽  
GUOQIANG LIANG ◽  
YUCHUN MA ◽  
YU WANG ◽  
JINIAN BIAN
Keyword(s):  
Global Optimization ◽  
Design Method ◽  
Critical Path ◽  
Design Flow ◽  
Path Delay ◽  
Wire Length ◽  
Fine Grained ◽  
Effective Strategies ◽  
Optimization Framework ◽  
Current Design

Dynamic Partially Reconfiguration (DPR) designs provide additional benefits compared to traditional FPGA application. However, due to the lack of support from automatic design tools in current design flow, designers have to manually define the dimensions and positions of Partially Reconfigurable Regions (PR Regions). The following fine-grained placement for system modules is also limited because it takes the floorplanning result as a rigid region constraint. Therefore, the manual floorplanning is laborious and may lead to inferior fine-grained placement results. In this paper, we propose to integrate PR Region floorplanning with fine-grained placement to achieve the global optimization of the whole DPR system. Effective strategies for tuning PR Region floorplanning and apposite analytical evaluation models are customized for DPR designs to handle the co-optimization for both PR Regions and static region. Not only practical reconfiguration cost and specific reconfiguration constraints for DPR system are considered, but also the congestion estimation can be relaxed by our approach. Especially, we established a two-stage stochastic optimization framework which handles different objectives in different optimization stages so that automated floorplanning and global optimization can be achieved in reasonable time. Experimental results demonstrate that due to the flexibility benefit from the unification of PR Region floorplanning and fine-grained placement, our approach can improve 20.9% on critical path delay, 24% on reconfiguration delay, 12% on congestion, and 8.7% on wire length compared to current DPR design method.

The Damage Characteristic Influence and the Seismic Measure Research on the Frame Structure by the Filler Wall

2011 ◽  
Vol 243-249 ◽  
pp. 447-452
Author(s):  
De Jian Yang ◽  
Sai Lan Mao
Keyword(s):  
Adverse Effects ◽  
Seismic Performance ◽  
Design Method ◽  
Shear Wall ◽  
Frame Structure ◽  
Wall Structure ◽  
Related Research ◽  
Weak Layer ◽  
Current Design ◽  
Damage Characteristic

The paper analyses the damages of the frame structure with bottom weak layer considering of Wenchuan earthquake. The analysis result indicates the current design method "pure frame" is imperfect. The related research shows that important reason for the bottom weak layer’s breakage is the stiffness mutation which is caused by the filler wall. If we arranged partial shear wall structure in the bottom weak layer, the adverse effects of stiffness mutation will be decreased, and improve the seismic performance of the frame structure with bottom weak layer.

Optimization Design and Inner Flow Analysis on a Medium-High Specific Speed Centrifugal Pump

2013 ◽  
Author(s):  
Fan Zhang ◽  
Shouqi Yuan ◽  
Qiang Fu ◽  
Bo Hu ◽  
Yi Tao ◽  
...  
Keyword(s):  
Optimization Design ◽  
Design Method ◽  
Flow Analysis ◽  
Design Flow ◽  
Test Results ◽  
Centrifugal Pumps ◽  
Parameters Selection ◽  
Wrap Angle ◽  
Specific Speed ◽  
Low Efficiency

Aiming at the problems of low efficiency, easily overload and having humps of the TS100–200 centrifugal pumps, four impellers are designed with different blade curves to improve the performances of the pumps. Non-overload design method is adopted for parameters selection of impellers. The 3-D models and the 1.61 million structure grids were generated by Pro/E and ICEM respectively. After the boundary conditions of velocity inlet, outflow in the outlet and no-slip wall were specified, and the flow model was complemented with the standard k-ε model by using the commercial software CFX 12.1. The distributions of pressure, turbulence kinetic energy and streamlines in four impellers are obtained during simulation, as well as their hydraulic performances. The wrap angle φ is a critical parameter to the blade shape. Impeller-2 with appropriate wrap angle φ shows good hydraulic characteristics and excellent inner flow patterns, and it is produced for experiments by prototyping rapidly. The test results are in accordance with the simulating results. The head of impeller-2 is 5% higher than the design parameter at most and the efficiencies are nearly 6% higher than the efficiencies of the prototype pump at the design flow rate QR. The test results also show a good non-overload performances. The results prove that it is an effective and reliable method to the optimal design of centrifugal pumps with medium-high specific speed.

Dimension Optimization Design of the Stewart Platform in FAST

2011 ◽  
Vol 308-310 ◽  
pp. 2110-2113 ◽  
Author(s):  
Rui Yao ◽  
Wen Bai Zhu ◽  
Qing Ge Yang
Keyword(s):  
Radio Telescope ◽  
Optimization Design ◽  
Design Method ◽  
Stewart Platform ◽  
Design Flow ◽  
Guizhou Province ◽  
Objective Functions ◽  
The World ◽  
Adjustable Mechanism ◽  
Feed Support System

China is now building the largest single dish radio telescope in the world in Guizhou province, which is called Five-hundred meter Aperture Spherical radio Telescope (FAST). A Stewart platform is introduced in FAST as an accuracy adjustable mechanism for feed receivers. The main purpose of this paper is to discuss dimension optimization design method of the Stewart platform based on three optimization objective functions. The optimization objective functions can reflect the operability and accuracy of the Stewart platform, and optimization design flow is presented according to the important degree of the three optimization objectives. Finally, a set of optimized parameters is obtained, and the study in this paper provides a basis for the coming optimization the feed support system for FAST in the next step.

Research on Analysis and Design Method of the Pile-Raft Foundation with Post-Cast Concrete Strip

2012 ◽  
Vol 446-449 ◽  
pp. 1541-1545
Author(s):  
Zhao Wu Shen ◽  
Zhen Min Yang ◽  
Ya Min Zhang
Keyword(s):  
Pile Foundation ◽  
Design Method ◽  
Control Factor ◽  
Wall Structure ◽  
Foundation Design ◽  
Soil Stiffness ◽  
Analysis And Design ◽  
Raft Foundation ◽  
Cast Concrete ◽  
C Program

In order to analysis post-cast concrete strip influence to the pile-raft foundation, it has been taken to developed C++ program that is Poulos displacement solution calculating pile-soil stiffness and thick plank theory analyzing raft stiffness. Taking a frame and shear wall structure for example, it has been calculated to pile-raft foundation whether setting up post-cast strip or not that is foundation settlement, moment and so on. Results indicate that post-cast concrete strip is minutely influence to the pile foundation displacement and moment and not the control factor to this kind of pile foundation’s design. It gives some good references to similar structure analysis and can instruct this kind of pile-raft foundation design and construction

Research on the Design Method of a Scale Model of ECC Reinforced Concrete Precast Shear Wall Structure

2016 ◽  
Vol 858 ◽  
pp. 29-33
Author(s):  
Jian Yang ◽  
Shu Ting Liang ◽  
Xiao Jun Zhu ◽  
Dong Yue Wu ◽  
Guang Yun Wang
Keyword(s):  
Reinforced Concrete ◽  
High Performance ◽  
Similarity Theory ◽  
Design Method ◽  
Precast Concrete ◽  
Shear Wall ◽  
Scale Model ◽  
Wall Structure ◽  
Model Structure ◽  
Precast Shear Wall

Engineered cementitious composite (ECC) is a class of high performance cementitious composites with pseudo strain hardening behavior and excellent crack control. Substitution of concrete with ECC can avoid the cracking and durability problems associated with brittleness of concrete. In this paper, it is aimed to design a scale model of ECC reinforced concrete precast shear wall structure. Referencing the prototype structure which is a precast concrete shear wall structure in Nantong, Jiangsu Province, China, the size similarity constant is taken as 1/2. Consulting the scale similarity conditions, the similarity similar constants representing material characteristics, geometrical features, and load characteristics are calculated using the strength similarity theory. Besides, the reinforcements in the model structure are calculated and analyzed. The diameters of reinforcing steel bars in the model structure are determined by the principle of similar size. Equivalent principle of yield bearing capacity are used when there is no corresponding reinforcement selection. The research results of this paper will provide valuable preferences for design and analysis of ECC reinforced concrete precast shear wall structure.

The Impact of the Vortex Design Method on the Stall Behavior of Axial Flow Fan and Compressor Rotors

2008 ◽  
Author(s):  
Ja´nos Vad ◽  
Csaba Horva´th
Keyword(s):  
Flow Rate ◽  
Design Method ◽  
Axial Flow ◽  
Suction Side ◽  
Laser Doppler Anemometer ◽  
Design Flow ◽  
Performance Measurements ◽  
Global Performance ◽  
The Impact ◽  
Flow Blockage

The paper presents comparative studies on low-speed isolated rotors of free vortex design and controlled vortex design (CVD), in order to survey the impact of the vortex design method on the stall behavior of axial flow turbomachinery. The studies are based on 3D laser Doppler anemometer studies and global performance measurements, supplemented with literature data. CVD bladings are characterized by radially outward flow on the suction side due to spanwise changing circulation, and increased near-tip solidity and/or loading. These features were found to increase the near-tip endwall flow blockage and loss at the design flow rate, and to hasten stall. On this basis, it has been concluded that CVD tends to be disadvantageous from the viewpoint of the stall behavior. It was confirmed that forward blade sweep is a remedial strategy for moderating the stall-hastening effects of CVD, while retaining the favorable features of CVD.

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