A digital design method of geometric model for centrifugal fan impeller based on SolidWorks and VB

2011 ◽  
Author(s):  
Ning Xiao-bo ◽  
Jiang Quan-sheng
Keyword(s):  
Design Method ◽  
Geometric Model ◽  
Digital Design ◽  
Centrifugal Fan

scholarly journals Lightweight and maintainable rotary-wing UAV frame from configurable design to detailed design

2021 ◽  
Vol 13 (7) ◽  
pp. 168781402110349
Author(s):  
Huiqiang Guo ◽  
Mingzhe Li ◽  
Pengfei Sun ◽  
Changfeng Zhao ◽  
Wenjie Zuo ◽  
...  
Keyword(s):  
Design Method ◽  
Geometric Model ◽  
Optimization Method ◽  
Frame Structure ◽  
Manufacturing Cost ◽  
Detailed Design ◽  
High Manufacturing Cost ◽  
The Military ◽  
Rotary Wing ◽  
Novel Design

Rotary-wing unmanned aerial vehicles (UAVs) are widespread in both the military and civilian applications. However, there are still some problems for the UAV design such as the long design period, high manufacturing cost, and difficulty in maintenance. Therefore, this paper proposes a novel design method to obtain a lightweight and maintainable UAV frame from configurable design to detailed design. First, configurable design is implemented to determine the initial design domain of the UAV frame. Second, topology optimization method based on inertia relief theory is used to transform the initial geometric model into the UAV frame structure. Third, process design is considered to improve the manufacturability and maintainability of the UAV frame. Finally, dynamic drop test is used to validate the crashworthiness of the UAV frame. Therefore, a lightweight UAV frame structure composed of thin-walled parts can be obtained and the design period can be greatly reduced via the proposed method.

scholarly journals Spatial Baseline Optimization for Spaceborne Multistatic SAR Tomography Systems

Sensors ◽  
2019 ◽  
Vol 19 (9) ◽  
pp. 2106 ◽  
Author(s):  
Jiuchao Zhao ◽  
Anxi Yu ◽  
Yongsheng Zhang ◽  
Xiaoxiang Zhu ◽  
Zhen Dong
Keyword(s):  
Surface Deformation ◽  
Design Method ◽  
Geometric Model ◽  
Three Dimensional ◽  
Optimization Method ◽  
Deformation Measurement ◽  
Experimental Simulation ◽  
Baseline Design ◽  
Imaging Performance ◽  
The Impact

Spaceborne multistatic synthetic aperture radar (SAR) tomography (SMS-TomoSAR) systems take full advantage of the flexible configuration of multistatic SAR in the space, time, phase, and frequency dimensions, and simultaneously achieve high-precision height resolution and low-deformation measurement of three-dimensional ground scenes. SMS-TomoSAR currently poses a series of key issues to solve, such as baseline optimization, spatial transmission error estimation and compensation, and the choice of imaging algorithm, which directly affects the performance of height-dimensional imaging and surface deformation measurement. This paper explores the impact of baseline distribution on height-dimensional imaging performance for the baseline optimization issue, and proposes a feasible baseline optimization method. Firstly, the multi-base multi-pass baselines of an SMS-TomoSAR system are considered equivalent to a group of multi-pass baselines from monostatic SAR. Secondly, we establish the equivalent baselines as a symmetric-geometric model to characterize the non-uniform characteristic of baseline distribution. Through experimental simulation and model analysis, an approximately uniform baseline distribution is shown to have better SMS-TomoSAR imaging performance in the height direction. Further, a baseline design method under uniform-perturbation sampling with Gaussian distribution error is proposed. Finally, the imaging performance of different levels of perturbation is compared, and the maximum baseline perturbation allowed by the system is given.

scholarly journals Shape-changing tensegrity-membrane building skin

2020 ◽  
Vol 310 ◽  
pp. 00046
Author(s):  
Lenka Kabošová ◽  
Eva Kormaníková ◽  
Stanislav Kmeť ◽  
Dušan Katunský
Keyword(s):  
Design Method ◽  
Global Climate ◽  
Weather Conditions ◽  
Building Envelope ◽  
Digital Design ◽  
Design Stage ◽  
Design Tools ◽  
Ambient Conditions ◽  
Weather Extremes ◽  
The Impact

Building skins are persistently exposed to changes in the weather, including the cases of weather extremes, increasing in frequency due to global climate change. As a consequence of the advancements of digital design tools, the integration of the weather conditions into the design process is much smoother. The impact of the ambient conditions on buildings and their structures can be digitally analyzed as early as in the conceptual design stage. These new design tools stimulate original ideas for shape-changing building skins, actively reacting to the dynamic weather conditions. In the paper, a digital design method is introduced, leading towards the design of a building skin, able of the passive shape adaptation when subjected to the wind. The designed building skin consists of a tensegrity structure where the tensioned elements are substituted by a tensile membrane, creating a self-equilibrated building skin element. In the previous research, a small prototype of this wind-adaptive element was created. The computer simulations are employed to predict the adaptive behavior of a bigger, full-scale building skin element. The before-mentioned building envelope becomes an active player in its surrounding environment, passively reacting to the wind in real-time, thanks to the geometric and material properties. Due to the local shape changes caused by the wind force, the wind can be perceived unconventionally through the adaptive building structure.

On the Design Method of Noise Reduction of Centrifugal Fan

2012 ◽  
Vol 487 ◽  
pp. 520-524
Author(s):  
Li Xia Peng
Keyword(s):  
Noise Reduction ◽  
Reduction Method ◽  
Design Method ◽  
Noise Generation ◽  
Centrifugal Fan ◽  
Centrifugal Blower

The application of centrifugal fan is wide, but the huge noise can pollute the environment. This paper will discuss the mechanism of centrifugal blower noise generation, and put forward noise reduction method in designing centrifugal blower creatively, thus can solve the problems effectively.

scholarly journals Research on the Design and Modification of Asymmetric Spur Gear

2015 ◽  
Vol 2015 ◽  
pp. 1-13 ◽  
Author(s):  
Xiaohe Deng ◽  
Lin Hua ◽  
Xinghui Han
Keyword(s):  
Computer Aided Design ◽  
Design Method ◽  
Geometric Model ◽  
Simulation Method ◽  
Transmission Error ◽  
Spur Gear ◽  
Geometric Shape ◽  
Spur Gears ◽  
Gear Design ◽  
Aided Design

A design method for the geometric shape and modification of asymmetric spur gear was proposed, in which the geometric shape and modification of the gear can be obtained directly according to the rack-cutter profile. In the geometric design process of the gear, a rack-cutter with different pressure angles and fillet radius in the driving side and coast side was selected, and the generated asymmetric spur gear profiles also had different pressure angles and fillets accordingly. In the modification design of the gear, the pressure angle modification of rack-cutter was conducted firstly and then the corresponding modified involute gear profile was obtained. The geometric model of spur gears was developed using computer-aided design, and the meshing process was analyzed using finite element simulation method. Furthermore, the transmission error and load sharing ratio of unmodified and modified asymmetric spur gears were investigated. Research results showed that the proposed gear design method was feasible and desired spur gear can be obtained through one time rapid machining by the method. Asymmetric spur gear with better transmission characteristic can be obtained via involute modification.

Development and Application of CAD Technology in Railway Vehicle Studying

2014 ◽  
Vol 1037 ◽  
pp. 468-473
Author(s):  
Xu Xu Wang ◽  
Guang Zhong Hu ◽  
Shou Ne Xiao ◽  
Yong Ming Tang
Keyword(s):  
Data Management ◽  
Design Method ◽  
Digital Design ◽  
Current Status ◽  
Railway Vehicle ◽  
Rail Vehicle ◽  
Parametric Data ◽  
Visualization Technology ◽  
Organic Combination ◽  
And Control

The emergence and development of CAD technology, and its development and current status of applied research on rail vehicle in our country is introduced. For four key technologies of CAD on digital design direction of rail vehicles, which are integrated, modular, parametric, data management and control, is discussed detailed. What’s more, the direction of rail vehicle design is referred to, which introduces new innovation of TRIZ, universal design and reconfigurable design in theory, changes reverse engineering to top-down design in the design method, realizes the organic combination of modular and integrated in design platform development, and accelerates basic technology research which contains unstructured data processing technology, non-relational database management technology and visualization technology in data management .

Digital Design of Automotive Wire-Harness

2013 ◽  
Vol 397-400 ◽  
pp. 882-888
Author(s):  
Yong Liu ◽  
Sheng Rui Yuan ◽  
Na Zhou ◽  
Xun Yi Dang
Keyword(s):  
Data Management ◽  
Design Method ◽  
Design Methods ◽  
Digital Design ◽  
Interaction Data ◽  
3D Interaction ◽  
3D Design ◽  
Wire Harness ◽  
Existing Problems ◽  
Schematic Layout

In allusion to the current existing problems of automotive wire-harness design, which are no interaction between 2D design and 3D design, and disconnect between design level and simulation level, the advanced design methods are needed. In this paper, it puts forward a kind of automotive wire-harness design method based on CHS and PRO/E software. Then it details its design steps including schematic / layout / harness design, 3D interaction, data management, etc. Finally, it summarizes the advantages of this advanced design method.

Collision Detection Analysis of 2D Layout Based on Convex Hull Plus Rubber Band Simulation

2014 ◽  
Vol 488-489 ◽  
pp. 1480-1484
Author(s):  
Juan Lu ◽  
Jia Xun Wei ◽  
Wei Xia ◽  
Jun Yan Ma ◽  
Li Ying ◽  
...  
Keyword(s):  
Convex Hull ◽  
Collision Detection ◽  
Design Method ◽  
Rubber Band ◽  
Digital Design ◽  
Detection Methods ◽  
Movement Model ◽  
Model Based ◽  
Collision Response ◽  
Optimized Model

It is an innovative design method in physics that product layout design is abstracted into convex hull plus rubber band simulation layout mode by setting up the optimized model. Based on the physics model of Newtons Second Law, this paper analyzed collision detection methods during the process of realizing reasonable layout, and it is founded that real-time collision detection and collision response during movement, produced components within the given beat, appeared to be the key content of resolving digital model design. In this paper, Area Difference method was adopted to detect when the collision occurred during component movement and what kind of state the component tended to be in collision. At the same time, it also determined the interference degree, solved critical point pose for collision response as well as its generation time and related torque and force, which can confirm the components continued movement model of rotation and sliding. Meanwhile, it employed the Judgment Matrix method to analyze collision response so as to confirm the collision interference relationship and collision action state, movement possessing mode (rotation, sliding and retraction, etc.) within the remaining time after collision with given beat during the layout process. All these provided with a practical solution for digital design of optimized model based on convex hull plus rubber band simulation compact layout.

Three-Dimensional Digital Design for Osteotomy in the Treatment of Congenital Hemivertebra

2013 ◽  
Vol 804 ◽  
pp. 167-173
Author(s):  
Huan Wen Ding ◽  
Guang Wen Yu ◽  
Qiang Tu ◽  
Jian Jian Shen ◽  
Ying Jun Wang
Keyword(s):  
Computer Simulation ◽  
Internal Fixation ◽  
Pedicle Screw ◽  
Operative Time ◽  
Design Method ◽  
Three Dimensional ◽  
Digital Design ◽  
Computer Assisted ◽  
Computer Assisted Design ◽  
Computer Aided

To establish a new three-dimensional (3D) digital design method for osteotomy and assess its application value in the surgical treatment of hemivertebrae. Preoperative 3D digital designs for osteotomy of the hemivertebrae were performed, which included computer simulation of the osteotomy and the internal fixation process, and computer-assisted design (CAD) of the templates for osteotomy of the hemivertebrae, pedicle screw positioning, and internal fixation rods. Template-guided osteotomy of the hemivertebrae plus pedicle screw and rod internal fixation were accurately implemented. The preoperative use of this new computer-aided 3D digitized and paperless surgical design can improve the safety, accuracy, and operative time for osteotomy in the treatment of hemivertebrae.

scholarly journals CFD Simulation of the Air Flow Field in the Multi Blade Centrifugal Fan

2015 ◽  
Vol 9 (1) ◽  
pp. 769-772
Author(s):  
Jiawei Li
Keyword(s):  
Flow Field ◽  
Cfd Simulation ◽  
Design Method ◽  
Axial Flow ◽  
Centrifugal Fan ◽  
Design And Optimization ◽  
Optimization Parameters ◽  
Complex Models ◽  
Number Of Leaves ◽  
Inlet Angle

In this paper, the multi blade centrifugal fan parameter CAD/CFD was developed. Before treatment with the traditional design method as the foundation, use AutoCAD as development of the embedded language. The work of this regulation to establish a set of more perfect design and optimization program of axial flow fan in air, improve its economy, and provided a shortcut for energy saving and noise reduction of multi blade centrifugal machine. Also in the establishment and the simplification of complex models, mesh generation, calculation and other aspects of the use of the model to do some beneficial exploration, hoping to provide reference of the similar simulation numerical type. Influence on the performance of multi blade centrifugal fan impeller is the largest parameters such as the blade outlet angle, inlet angle and blade number. As the numerical simulation application in modern design method, in order to improve the performance of pressure air fan as the optimization objective, the optimization of the fan, the fan impeller optimization parameters more reasonable flow field distribution, air pressure with better performance is obtained, and the formula to determine the recommended number of leaves.

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