Mechanical Design and Simulation Analysis of Finned Tube Winding Machine for Assembly

2014 ◽  
Vol 621 ◽  
pp. 215-220
Author(s):  
Ya Ping Wang ◽  
Ge Li ◽  
Lei Gao ◽  
Dong Yao Liu ◽  
Chang Xuan Shi ◽  
...  
Keyword(s):  
Simulation Analysis ◽  
Mechanical Design ◽  
Design Method ◽  
Three Dimensional ◽  
Finned Tube ◽  
Design Parameters ◽  
Market Demand ◽  
Finned Tubes ◽  
Low Efficiency ◽  
Winding Machine

With the increasing of market demand for finned tube and fin tube processing equipment in China continued to deepen, the problems of the inefficient study design a new type of finned tube winding machine in order to solve the traditional winding machine problem such as low efficiency and the unstable quality. Using a design method for assembly , complete design parameters to calculate the main structure of the feeding and winding device and implementing the device on three dimensional Assembly based on CATIA modeling process. Finally, to verify the overall structural design rationality, we have created a virtual prototype of finned tubes and motion simulation and the collision detection also be done.

On the Coupling of Inverse Design and Optimization Techniques for Turbomachinery Blade Design

2006 ◽  
Author(s):  
Duccio Bonaiuti ◽  
Mehrdad Zangeneh
Keyword(s):  
Mechanical Design ◽  
Design Method ◽  
Three Dimensional ◽  
Axial Compressor ◽  
Optimization Techniques ◽  
Operating Conditions ◽  
Inverse Design ◽  
Design Parameters ◽  
Optimization Strategy ◽  
Design And Optimization

Optimization strategies have been used in recent years for the aerodynamic and mechanical design of turbomachine components. One crucial aspect in the use of such methodologies is the choice of the geometrical parameterization, which determines the complexity of the objective function to be optimized. In the present paper, an optimization strategy for the aerodynamic design of turbomachines is presented, where the blade parameterization is based on the use of a three-dimensional inverse design method. The blade geometry is described by means of aerodynamic parameters, like the blade loading, which are closely related to the aerodynamic performance to be optimized, thus leading to a simple shape of the optimization function. On the basis of this consideration, it is possible to use simple approximation functions for describing the correlations between the input design parameters and the performance ones. The Response Surface Methodology coupled with the Design of Experiments (DOE) technique was used for this purpose. CFD analyses were run to evaluate the configurations required by the DOE to generate the database. Optimization algorithms were then applied to the approximated functions in order to determine the optimal configuration or the set of optimal ones (Pareto front). The method was applied for the aerodynamic redesign of two different turbomachine components: a centrifugal compressor stage and a single-stage axial compressor. In both cases, both design and off-design operating conditions were analyzed and optimized.

Dynamic Modeling of Powder Delivery Systems in Gravity-Fed Powder Feeders

2005 ◽  
Vol 128 (1) ◽  
pp. 337-345 ◽  
Author(s):  
Heng Pan ◽  
Robert G. Landers ◽  
Frank Liou
Keyword(s):  
System Dynamics ◽  
Delivery System ◽  
Mechanical Design ◽  
Three Dimensional ◽  
Low Flow ◽  
Order System ◽  
Tube Length ◽  
Design Parameters ◽  
Simulation Studies ◽  
Transport Delay

This paper presents an approach for modeling powder delivery system dynamics in low flow rate applications. Discrete particle modeling (DPM) is utilized to analyze the motion of individual powder particles. In DPM, an irregular bouncing model is employed to represent the powder dispersion in the powder delivery system induced by non-spherical particle-wall collisions. A three-dimensional friction collision model is utilized to simulate the interactions between particles and the powder delivery system walls. The modeling approach is experimentally verified and simulation studies are conducted to explore the effect of powder delivery system mechanical design parameters (i.e., tube length, diameter, and angle, number of tubes and meshes, and mesh orientation and size) on the powder flow dynamics. The simulation studies demonstrate that the powder delivery system dynamics can be modeled by a pure transport delay coupled with a first order system.

Enabling Variation of Manufacturing Process Parameters in Early Stages of Product Development

2006 ◽  
Author(s):  
Patrik Boart ◽  
Ola Isaksson
Keyword(s):  
Product Development ◽  
Process Parameters ◽  
Manufacturing Process ◽  
Mechanical Design ◽  
Design Method ◽  
Local Level ◽  
Simulation Models ◽  
Design Parameters ◽  
Functional Requirements ◽  
Early Stages

Currently, mechanical design of aero engine structural components is defined by dimensioning of Design Parameters (DP's) to meet Functional Requirements (FR's). FR's are typically loads, geometrical interfaces and other boundary conditions. Parameters from downstream processes are seldom actually seen as DP's. This paper proposes that downstream process parameters are treated as DP's which calls for engineering methods that can define and evaluate these extended set of DP's. Using the proposed approach manufacturing process alternatives can be used as DP's in early stages of product development. Both the capability to quantitatively assess impact of varying manufacturing DP's, and the availability of these design methods are needed to succeed as an early phase design method. One bottleneck is the preparation time to define and generate these advanced simulation models. This paper presents how these manufacturing process simulations can be made available by automating the weld simulation preparation stages of the engineering work. The approach is based on a modular approach where the methods are defined with knowledge based engineering techniques-operating close to the CAD system. Each method can be reused and used independently of each other and adopted to new geometries. A key advantage is the extended applicability to new products, which comes with a new set of DP's. On a local level the lead time to generate such manufacturing simulation models is reduced with more than 99% allowing manufacturing process alternatives to be used as DP's in early stages of product development.

Numerical Investigation of Stator Blades Bow Effect on the Rotor Blade Erosion of a Wet Steam Turbine

2014 ◽  
Vol 670-671 ◽  
pp. 769-773
Author(s):  
Hong Yao ◽  
Wan Long Han ◽  
Shi Ming Pan ◽  
Zhong Qi Wang
Keyword(s):  
Steam Turbine ◽  
Numerical Investigation ◽  
Water Droplet ◽  
Mechanical Design ◽  
Design Method ◽  
Three Dimensional ◽  
Rotor Blades ◽  
Wet Steam ◽  
Water Droplet Erosion ◽  
Long Time

The water droplet erosion protection of the rotor blades has been an important issue for a long time, regardless of the design. The aim of this paper is to present a aerodynamic design method for decrease risk of water droplet erosion in wet steam turbine, as well as to present the comparison between then five diffrent bow stator blades. This paper also presents numerical investigation of three dimensional wet steam flows in a stage. This stage has long transonic blades designed using recent aerodynamic and mechanical design methods. The results show that, the one of the five diffrent bow stator blades decrease rist of water droplet erosion of rotaional blades, and the change of the efficiency is small.

scholarly journals Assessment of Mechanical Design Parameters for an Aero Gas Turbine Engine Jet Pipe Casing using Finite Element Analysis

2020 ◽  
Vol 9 (5) ◽  
pp. 1197-1201
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Gas Turbine ◽  
Mechanical Design ◽  
Three Dimensional ◽  
Gas Turbine Engine ◽  
Design Parameters ◽  
Element Analysis ◽  
Engine Operation ◽  
Turbine Engine

Aero Gas Turbine engines power aircrafts for civil transport application as well as for military fighter jets. Jet pipe casing assembly is one of the critical components of such an Aero Gas Turbine engine. The objective of the casing is to carry out the required aerodynamic performance with a simultaneous structural performance. The Jet pipe casing assembly located in the rear end of the engine would, in case of fighter jet, consist of an After Burner also called as reheater which is used for thrust augmentation to meet the critical additional thrust requirement as demanded by the combat environment in the war field. The combustion volume for the After burner operation together with the aerodynamic conditions in terms of pressure, temperature and optimum air velocity is provided by the Jet pipe casing. While meeting the aerodynamic requirements, the casing is also expected to meet the structural requirements. The casing carries a Convergent-Divergent Nozzle in the downstream side (at the rear end) and in the upstream side the casing is attached with a rear mount ring which is an interface between engine and the airframe. The mechanical design parameters involving Strength reserve factors, Fatigue Life, Natural Frequencies along with buckling strength margins are assessed while the Jet pipe casing delivers the aerodynamic outputs during the engine operation. A three dimensional non linear Finite Element analysis of the Jet pipe casing assembly is carried out, considering the up & down stream aerodynamics together with the mechanical boundary conditions in order to assess the Mechanical design parameters.

scholarly journals Parametric Design and Kansei Engineering in Goblet Styling Design

2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Fong-Gong Wu ◽  
Chii-Zen Yu
Keyword(s):  
Evaluation Method ◽  
Parametric Design ◽  
Design Method ◽  
Three Dimensional ◽  
Transformation Method ◽  
Market Demand ◽  
Kansei Engineering ◽  
Cam Mechanism ◽  
Projective Curves ◽  
Point Data

In this study, we developed a computer-aided product design method for goblet styling design based on two methods. The first was parametric design derived from an adjustable cam mechanism, which was used for shape generation, and the second was Kansei engineering, which was used for shape evaluation. In the shape generation method, motion curves from an adjustable cam were used. Designers can collect feature point data from existing products to define the boundary conditions of adjustable cam motion equations; furthermore, adjustable motion curves allow parametric design. Through adjusting a single parameter, motion curves were changed to be used as projective curves for the styling design of goblets. Then, a coordinate transformation method was applied to support the three-dimensional styling design of goblets. In the shape evaluation method, some goblet stylings were regularly selected to determine adjective degrees by production design experts. Adjective degrees for goblets that had not been selected were determined through interpolation. Market demand was defined as the preference of customers for specific adjective degrees for goblets.

scholarly journals Optimization of Meridional Flow Channel Design of Pump Impeller

2004 ◽  
Vol 10 (2) ◽  
pp. 115-119 ◽  
Author(s):  
Sunao Miyauchi ◽  
Hironori Horiguchi ◽  
Jun-ichirou Fukutomi ◽  
Akihiro Takahashi
Keyword(s):  
Design Method ◽  
Three Dimensional ◽  
Optimization Method ◽  
Meridional Flow ◽  
Flow Channel ◽  
Design Parameters ◽  
Channel Design ◽  
Pump Impeller ◽  
Circulation Distribution ◽  
Meridional Shape

The meridional flow channel design of a pump impeller affects its performance. However, since so many design parameters exist, a new design method is proposed in which a meridional and blade-to-blade flow channel is designed by the parallel use of the circulation distribution provided by the designer. Thus, an optimization method was used to design an axis-symmetrical meridional flow channel from the circulation distribution. In addition, the inverse design method proposed by Zangeneh et al. (1996) was employed to design a three-dimensional blade-to-blade flow channel from the circulation distribution and the optimized meridional shape. In this article, a few design examples and these Computational Fluid Dynamics (CFD) validations are also given.

Three-Dimensional Design Method for Long Blades of Steam Turbines Using Fourth-Degree NURBS Surface

2010 ◽  
Author(s):  
Shigeki Senoo ◽  
Koji Ogata ◽  
Tateki Nakamura ◽  
Naoaki Shibashita
Keyword(s):  
Design Method ◽  
Three Dimensional ◽  
Aerodynamic Performance ◽  
Flow Path ◽  
Design Parameters ◽  
Control Points ◽  
Steam Turbines ◽  
Nurbs Surface ◽  
Fourth Degree ◽  
Nurbs Curve

A new blade design method for steam turbines using the fourth-degree NURBS surface was developed. The method enables engineers to easily generate three-dimensional complex blade shapes that have inherently good aerodynamic performance and constraint satisfaction. The developed design method has three steps. First, 2D aerofoils are independently generated at each design height. The convergent or convergent-divergent aerofoils are selected on the basis of the outlet Mach number. The convergent flow path is defined by a fourth-degree NURBS curve to preserve the continuity of the slope of the curvature. The divergent flow path for supersonic flow is generated by the method of characteristic curves to avoid strong shock waves. The inlet and outlet angles are constrained to coincide with the flow angle of the velocity triangle. The design parameters, such as chord length, stagger angle and control points of NURBS are automatically decided using an evolutionary optimization technique NSGA-II to minimize the loss by computational fluid dynamics. Therefore, fewer man-hours are needed for design work and better proficiency is not a significant requirement. Second, the number of control points and knot vectors are equalized for all aerofoils by inserting or removing knots and fitting the divergent part by the fourth-degree NURBS curve. Finally, all aerofoils are stacked radially, for example, along the centroid axis, and the fourth-degree NURBS surface is generated by interpolating the control points of the NURBS curves of all the aerofoils. This design method can easily generate long blades of the last stage for steam turbines. The blade has a surface with continuity of the slope of curvature in all directions and good aerodynamic performance under constraints.

scholarly journals Probabilistic investigations on the watertightness of jet-grouted ground considering geometric imperfections in diameter and position

2017 ◽  
Vol 54 (10) ◽  
pp. 1447-1459 ◽  
Author(s):  
Yutao Pan ◽  
Yong Liu ◽  
Jun Hu ◽  
Miaomiao Sun ◽  
Wei Wang
Keyword(s):  
Flow Rate ◽  
Statistical Evaluation ◽  
Design Method ◽  
Three Dimensional ◽  
Design Parameters ◽  
Slab Thickness ◽  
Geometric Imperfections ◽  
Reliability Based Design ◽  
Jet Grouting ◽  
Harmonic Average

The effect of geometric imperfections in both diameter and position of jet-grouted columns on the watertightness of an underground cement-treated slab is investigated in this study. A three-dimensional discretized algorithm is proposed to facilitate the detection and measurement of untreated zones that penetrate the treated slab. The normalized flow rate of a cement-treated slab is then evaluated by calculating the harmonic average area of the penetrated defect. Statistical evaluation of the gross flow rate through the penetrated defects is carried out via Monte Carlo simulations. The results show that a more economic design is obtainable if intracolumn variation of diameter is considered or multi-shaft jet-grouting is used. Based on the statistical results, a reliability-based design method is proposed for designers to strike a balance among various design parameters, including slab thickness, depth, column diameter, and column spacing.

Research and Design of Pipe Cleaning Device with Self-Rotation

2020 ◽  
Vol 13 ◽  
Author(s):  
Zhong Chen ◽  
Xiaoyang Qiu ◽  
Hu Yang ◽  
Lingling Yang
Keyword(s):  
Simulation Analysis ◽  
Three Dimensional ◽  
Fluid Simulation ◽  
Technical Problems ◽  
Three Dimensional Modeling ◽  
Cleaning Device ◽  
New Ideas ◽  
Drainage Pipe ◽  
Low Efficiency ◽  
Nozzle Head

Background: With more and more blockages in the drainage pipe, recent patents on the design of pipe cleaning device are also addressed increasingly. But the current pipe cleaning device has only a single dredging function, and the inefficiency of the nozzle head, which cannot be used for cleaning of the seriously blocked pipelines. Objective: In order to solve these problems, a novel pipe cleaning device with self-rotation is proposed and the fluid simulation analysis is adopted for the low efficiency problem of the nozzle head in this paper. Methods: Firstly, the overall structure of the drainage pipeline cleaning device was designed. Secondly, the size of the nozzle and the nozzle head was determined. Thirdly, the fluid simulation analysis of the nozzle head was carried out to realize the optimal design of the nozzle head. Finally, according to the above design, a prototype was manufactured. Results: This paper presents a novel pipe cleaning device with self-rotation, which is different from current patents. It is divided into the nozzle head system, walking system, cleaning system, three-dimensional modeling and assembly of the above three mechanical systems. The simulation results demonstrated that if a deflector is not fixed inside the nozzle head, the pressure of the nozzle head is about 8542751.89Pa, and the flow rate at the outlet of the nozzle head is 354.897m/s. If a deflector is fixed, the corresponding data is 1.32e+008Pa and 446.336m/s. The result shows that the proposed new nozzle head optimization is effective. Conclusion: The new design solves the problems of the current patents about pipe cleaning device, and solves the key technical problems of inconvenient cleaning of pipe blockage and low efficiency nozzle head under complex working conditions. As a whole, this paper provides new ideas and new methods for the efficient work of pipe cleaning device and the removal of hard dirt on the inner wall of the pipeline.

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