Two-dimensional Design Method Research Articles

A two-dimensional design and synthesis method for coordinated control of flexible-operational combined cycle of gas turbine

The conventional combined cycle of gas turbine (CCGT) coordinated control strategy cannot quickly track the increasingly frequent and rapidly changing automatic generation control (AGC) commands due to the high penetration of renewable energy. In this study, a novel CCGT coordinated control strategy is proposed based on a two-dimensional design method consisting of time-scale decomposition and energy-flow coupling analysis. First, some critical design parameters of coordinated control, such as the power assignment ratios of gas turbine and steam turbine, and the energy storage coefficients of the heating networks are derived from energy-flow coupling analysis. Then, the AGC commands are decomposed into peak-shaving signals, low-frequency signals, and high-frequency signals from time-scale dimensional. As a result, a novel CCGT coordinated control strategy with precise dynamic heat-power conversion compensation is proposed and synthesized using distributed model predictive control to solve the large inertia, constrained, multivariable control problems. Simulation results show that the absolute integral error of the AGC tracking decreases to 1736 and the maximum ramping rate of the gas turbine is decreased by 20% without affecting the extraction steam flow under the proposed control strategy. All three indicators demonstrate the advantages of the coordinated control strategy designed by the proposed two-dimensional method.

Application of Virtual Reality Technology Based on Bim in Architectural Engineering Design

With the rapid growth of sci & tech, the new technology in architectural engineering has also advanced by leaps and bounds, and the traditional two-dimensional design method of architectural engineering can no longer meet the needs of modern society. Building information model (BIM) and virtual reality (VR) technology are the important foothold for the comprehensive and optimized combination of information technology and architectural engineering design, and provide effective technical and platform support for solving the current design problems of architectural engineering projects. This article discusses the application of VR based on BIM in architectural engineering design, in order to realize dynamic management of engineering data on this basis, so as to improve the construction efficiency of the whole architectural engineering and promote the further improvement of architectural engineering design level.

Problems of the implementation of BIM technologies in Russia

This article is devoted to the latest technology of computer-aided design-Building Information Modeling (Building Information Modeling or Building Information Model). It discusses the prerequisites for the emergence of information modeling, describes its advantages and capabilities compared with the traditional two-dimensional design method and are presented in the figures. Currently in Russia there is a problem of introducing BIM. In this paper, we identified the main problem of introducing BIM technologies in Russia, which is associated with a decrease in the productivity of designers when switching to a new design technology, as well as possible solutions to this problem. In addition, the difficulties arising from attempts to move to BIM-technologies are described. The main conclusion is the indisputable advantage of BIM-technologies over 2D design.

Discussion on Application of BIM Technology in Aluminum Alloy Formwork Support System

With the development of science and technology, society has put forward more stringent requirements for the construction industry. The traditional two-dimensional design method can no longer meet the requirements of architectural design. The proposal of BIM technology and its application in the construction industry have solved the problems existing in traditional architectural design methods and adapted to the long-term development needs of architectural design. In the design of aluminum alloy formwork support system, BIM technology can realize efficient processing and management of massive data, realize informationization and integrated management of project design, and effectively improve the quality of project design. In view of this, the author believes that it is necessary to analyze the application of BIM technology in the design of aluminum alloy template support system. Based on the overview of this new technology, this paper will analyze and discuss the application and practical application of BIM technology in the design of aluminum alloy template support system.

Verificação de critérios de desempenho em projetos de arquitetura com a modelagem BIM

O presente trabalho tem como objetivo propor uma forma de incorporar a verificação de critérios de desempenho em projetos de arquitetura de edificações habitacionais utilizando a Modelagem de Informação da Construção (Building Information Modeling – BIM), como uma alternativa ao método de projeto bidimensional, tradicionalmente utilizado. Foi adotado o método baseado na pesquisa construtiva (constructive research) para o desenvolvimento do trabalho no Programa de Mestrado Profissional em Habitação do Instituto de Pesquisas Tecnológicas, IPT. Requisitos e critérios de desempenho constantes da ABNT NBR 15575:2013 Edificações Habitacionais – Desempenho, foram aplicados ao modelo BIM, no desenvolvimento de projetos de arquitetura, de forma que o projetista possa fazer uma verificação ao longo do desenvolvimento do projeto. O resultado foi promissor, considerando a possibilidade de identificar e detalhar aproximadamente um terço dos critérios constantes da ABNT NBR 15575:2013, usando somente a ferramenta da modelagem. Foram identificadas vantagens em utilizar recursos de softwares de modelagem, como etiquetas e tabelas para aplicações de regras e requisitos, que podem ser facilmente constatadas pelo modelo. Desta forma, nota-se que esse novo processo poderá resultar melhores projetos de arquitetura, com informações sobre desempenho mais completas e confiáveis. Se as ferramentas de simulação forem adotadas e associadas a projetos de arquitetura, poderão ser feitas verificações de outros requisitos e critérios, como por exemplo, simulação do desempenho térmico.

Aerodynamic design of a multi-stage industrial axial compressor

Axial compressors are widely used in industrial applications; high efficiencies and large operating ranges are main performance requirements for their aerodynamic designs. In this study, an aerodynamic design method for multi-stage axial compressors is proposed. The design of the first stage is based on the S1/S2 stream surface theory, and a repeated stage design method is proposed for subsequent stage designs. And in the first stage design, a multi-point optimization design is used to design the rotor and stator blade profiles for both high efficiencies and large operating ranges. A five repeated stage axial compressor with a large mass flow rate has been designed by this design method. Analysis results of the rotor and stator three-dimensional flow fields indicate that the flow is primarily limited to the S1 stream surface and the two-dimensional design method is applicable; the flow in subsequent stages possesses similar characteristics as the flow in first stage. In addition, the designed five-stage axial compressor has a total pressure ratio that approaches the design goal and a stability margin that exceeds the design goal. The novelty of this study includes two parts, one is the usage of multi-point optimization method for rotor and stator blade design, and the other is the repeated stage design method.

Aerodynamic design of an ultra-highly loaded booster of a high bypass ratio turbofan

Based on an existing high bypass ratio turbofan, this paper uses a new concept of diffusion blade profiles with large camber and low flow losses to design a rotor for the booster, which characterizes the low wheel speed, thus achieving ultra-high loading of the rotor, effectively increasing its stage pressure ratio and reducing the weight of the booster. A booster with only one stage is designed by using the new blade profiles to replace the original booster with three stages. A two-dimensional design method of S1 (blade to blade)/S2 (hub to tip) stream surfaces is applied to design the blades of the rotor and the stator in the booster, and the two-dimensional blade profiles in the S1 stream surface are designed by means of an optimization design method. The flow fields in the original and newly designed boosters are simulated by using a numerical method. At the design point, the newly designed booster has nearly the same total pressure ratio and mass flow rate as the original booster and exhibits higher efficiency than the original booster. The surge margins of both boosters are nearly equal, and the newly designed booster can preferably match the original intermediate case.

A Rapid Parametric CAD System for Fine-Blanking Progressive Dies

Fine-blanking is an advanced and precision stamping process. Designing the construction die is an important part of the entire development process. But for lots of special and complicated structures of fine-blanking dies, especially some progressive dies, many problems occurred during the traditional two-dimensional design method, such as heavy workload, time-consuming, difficulty of modification, difficulty of checking interference, difficulty of novice entry. To solve these problems, a rapid parametric CAD system based on SolidWorks is developed for fine-blanking progressive dies in the present study. The system comprises five modules, namely DIEBASE, WORKPART, STANDARD, MOTION and DRAWING. The first three modules are designed for the rapid designing and modeling of three different sets of die components. These modules work in tandem with the design-table-based standard part libraries. The MOTION module is designed to simulate the movement situation and check the interferences of the die structure. The last module is designed for the drawing documents of the die parts and assembly. The main feature of the system is its parameter-based interfacing for fine-blanking progressive die design. The design and modification jobs could be done easily and quickly by operating this system, and the system is easy to learn for semiskilled and even unskilled engineers. An illustrative example is demonstrated to show the usefulness of the system.

Two-dimensional transonic aerodynamic design method

This paper demonstrates the capabilities of a new transonic, two-dimensional design method, based on the simultaneous solution of multiple streamtubes, coupled through the position of, and pressure at, the streamline interfaces. This allows the specification of either the airfoil shape (direct, analysis mode) or the airfoil surface pressure distribution (inverse, design mode). The nonlinear system of equations is formulated in a conservative manner, which guarantees the correct treatment of shocks, and is solved by a rapid Newton solution method. Viscous effects can also be included through a coupled integral boundary-layer analysis. The first set of results shows the effect of different far-field treatments, demonstrating the improvement in accuracy obtained by including the second-order doublet terms in addition to the usual first-order vortex term. The results are also compared to those obtained by specifying straight far-field streamlines (corresponding to solid-wall wind-tunnel experiments) or constant far-field pressure (corresponding to freejet experiments) to show the sensitivity to the farfield distance. In the second set of results, the design method is used to design a transonic airfoil with C/ = 1.000 at A/oo = 0.70. It is shown that the off-design performance is improved by specifying a surface pressure distribution with a very weak shock.