Structure Design and Optimization of Vacuum Vessel for Spacecraft Thermal Test

2013 ◽  
Vol 390 ◽  
pp. 665-669
Author(s):  
Xiao Han ◽  
Bo Tao Liu ◽  
Shi Zeng Lyu ◽  
Yan Qi ◽  
Feng Guo
Keyword(s):  
External Pressure ◽  
Structure Design ◽  
The Body ◽  
Space Environment ◽  
Design Parameters ◽  
Main Body ◽  
Vacuum Vessel ◽  
Element Analysis ◽  
Design And Optimization ◽  
Thermal Test

The space environment simulator is a facility used to conduct thermal test for spacecraft, and vacuum vessel is the main body of it. During the test process, the vacuum vessel is exerted an external pressure of 0.1MPa, and there are various pipe orifices on the body of the vessel, therefore the intensity and stability should be taken into account carefully. This paper introduces three approaches for the design of structure intensity and stability of vacuum vessel, and takes GVU-600 space environment simulator as an example, which is the first aerospace facility developed by China for Russia. One approach is calculation by rules, and the second method utilizing finite element analysis, which could check details of the structure, but the efficiency of the previous two methods is low. In the end, a mathematics approach is introduced, which utilizes the optimization model, and the design parameters could be calculated accurately and efficiently.

Finite Element Analysis of the Nut-Supports Subassembly Based on ANSYS

2012 ◽  
Vol 215-216 ◽  
pp. 847-850
Author(s):  
Shou Jun Wang ◽  
Xing Xiong ◽  
Hong Jie Wang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Reference Data ◽  
Three Dimensional ◽  
Design Parameters ◽  
Weak Links ◽  
Fe Model ◽  
Element Analysis ◽  
Design And Optimization ◽  
Wave Maker

In the condition of alternating impact ,the nut-supports subassembly is analyzed according to uncertainty of design parameters. Firstly, a three-dimensional (3-D) finite element (FE) model of the nut-supports subassembly is built and is meshed,and the constraints and loads are imposed.Secondly,the model of nut-supports was assembled using the software ANSYS to understand the stress distribution and various parts of the deformation of the nut-supports and its weak links in the harmonic forces.Finally,socket head cap screw has not enough pre-load in the condition of alternating impact and will be simplified.It is analyzed and checked whether it is cut or not; which provides the reference data for design and optimization of the wave maker.

Optimal Structure Design and Analysis of Pressure Hull for the Underwater Glider

2013 ◽  
Vol 850-851 ◽  
pp. 317-321
Author(s):  
Da Lei Song ◽  
Li Ping Chen ◽  
Yong Fang Wang ◽  
Zhen Yu Wang
Keyword(s):  
Material Selection ◽  
Load Capacity ◽  
Structure Design ◽  
Design Solution ◽  
Main Body ◽  
Analysis Tool ◽  
Underwater Glider ◽  
Element Analysis ◽  
Autonomous Underwater Glider ◽  
Test Verification

Pressure hull is an important part of an underwater glider, on which the study was designed to ensure that it has sufficient strength and stability, the smallest weight, as well as the maximum internal deployment of space and load capacity. In order to find the best initial design solution of the pressure hull, this paper analyzes the design process of underwater vehicle systematically. After the shape and material selection of the main body and end cover, structural analysis and size optimization of pressure shell for autonomous underwater glider carried out by the finite element analysis tool Ansys Workbench, and the simulation results paves the way for the pressure test verification.

The Transient Response Analysis for the Damped Free Vibration of Plywood Box

2011 ◽  
Vol 338 ◽  
pp. 513-516 ◽  
Author(s):  
Yi Ding ◽  
Ying Xiang ◽  
Shan Qi Zeng ◽  
Yan Bo Yang
Keyword(s):  
Free Vibration ◽  
Structural Reliability ◽  
Reference Value ◽  
External Pressure ◽  
Structure Design ◽  
Response Analysis ◽  
Element Analysis ◽  
Mass System ◽  
Time Stress ◽  
The Finite Element Analysis

Aiming at the unreasonable phenomenon of the plywood box′ design in the current market, the mechanics research for the structure design of the plywood box was taken. In this paper, a damping spring-mass system for the plywood box is established by using the finite element analysis software ANSYS. In the case of simulated external pressure, analyzed the transient dynamic response, the relation between displacement and time, stress and time were gained in order to verify the structural reliability of the damped free vibration of plywood box during the carriage. Finally, the reliable basis for the design of plywood box was provided, the certain reference value of the standardized and the serialized production for plywood box was provided, as well as the basis of some analysis for the design of cushioning.

Design Development of a Vacuum Vessel With Detachable Top Lid Configuration

2015 ◽  
Author(s):  
Jaydeep Joshi ◽  
Ashish Yadav ◽  
Roopesh Gangadharan ◽  
Mudalakeri Girish ◽  
Shino Ulahannan ◽  
...  
Keyword(s):  
Neutral Beam ◽  
Test Facility ◽  
Current Status ◽  
Cylindrical Shape ◽  
Vacuum Vessel ◽  
Functional Requirements ◽  
Design Development ◽  
Element Analysis ◽  
Design And Optimization ◽  
Asme Code

In the Indian Test Facility (INTF), a Vacuum Vessel is designed to house neutral beam components to provide transmission for length of ∼20 meters which enables characterization of neutral beam parameters. INTF Vacuum vessel is designed in cylindrical shape and has a detachable top-lid for mounting as well as removal of internal components during installation and maintenance phases of test facility. Principal challenges involved in this are designing the detachable top lid and positioning the appropriate stiffeners within the space available on the vessel for meeting functional and operational requirements of in-vacuum deflection to less than 5mm (0.196 in.) and it is limited to 1mm (0.039 in.) in certain areas on the vessel. Moreover, ASME code [3] does not have design formulation for this detachable top lid configuration directly, hence, there is a need to adopt the available recommendations ASME code [3], assess their applicability, adopt appropriate one, improvise and affect it and validate it by Finite Element Analysis (FEA). This paper presents the comprehensive design methodology adopted for INTF Vacuum Vessel design and optimization of various parameters to meet the operational and functional requirements within the constraints of other mandatory interfaces. This paper also presents its manufacturing plan, fabrication challenges and current status of vessel fabrication.

Finite Element Analysis and Structure Design for Chassis of Aircraft Towbarless Tractor

2011 ◽  
Vol 328-330 ◽  
pp. 690-694
Author(s):  
Zhi Wei Xing ◽  
Yong Lv ◽  
Jun Hui Li
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Three Dimensional ◽  
Structure Design ◽  
The Body ◽  
Element Analysis ◽  
Future Design ◽  
Ground Support ◽  
Three Dimensional Modeling ◽  
Entire Vehicle

Aircraft tow-tractor is one of the absolutely necessary ground support equipments (GSE) in the airport. The chassis is the framework on which the body and working parts of the tow-tractor, what plays a significant role in a entire vehicle design. The endurance and rigidity of the chassis have a direct influence on the reliability and practicability. In this paper, a simplified model is established for the carriage of aircraft towbarless tractor on the three-dimensional modeling platform--Proe5.0, and then mechanical finite element analysis are proceeding by Ansys12.0. The results show that the chassis model is of a appropriate structure and the design coincides with actual requirements, the Stress Concentration at the joint between carriage and wheel-grip mechanism has been reduced substantially. All trial results have laid a foundation for future design of the entire tractor.

Design of a Compliant Jumping Robot With Passive Stabilizer

2020 ◽  
Author(s):  
Joshua Hooper ◽  
Martin Garcia ◽  
Paul Pena ◽  
Ayse Tekes
Keyword(s):  
Center Of Mass ◽  
Vertical Plane ◽  
Rigid Body Dynamics ◽  
The Body ◽  
Main Body ◽  
Body Parts ◽  
Element Analysis ◽  
Flexure Hinges ◽  
Jumping Robot ◽  
The Impact

Abstract This study presents the design and development of a compliant multi-link hopping mechanism actuated by a single DC motor. Two main design goals are to have a single piece designed main body for the jumping robot and a passive stabilizer to allow consecutive jumps. Mechanism consists of monolithically designed large deflecting main body incorporating the gears and initially curved flexure hinge. Due to the limitations of the design goal, revolute motion between top and bottom legs on the main body are realized by a compliant link which replaces the need of ball bearings. Also, continuous energy store and release during jumping is ensured by the same flexure hinges. Passive self-righting cage is attached to the bottom of the main body to maintain upright position both in landing and takeoff. The cage allows the center of mass to stay in the vertical plane to prevent tilting. During landing, cage absorbs the impact and allows the main body to roll to its initial configuration so that the robot can complete jumping. Mechanism parts including the cage are 3D printed using PETG. Design optimization of the body parts including the rigid legs and flexure hinges are analyzed both experimentally and analytically. Finite element analysis is performed to calculate the equivalent stiffness and natural frequency of the jumping robot and simplified mathematical model is derived using rigid body dynamics.

Design and Optimization of Thermomechanical Actuator via Contour Shaping

2005 ◽  
Author(s):  
Shih-Chi Chen ◽  
Martin L. Culpepper
Keyword(s):  
Mechanical Performance ◽  
Mechanical Energy ◽  
Thermal Strain ◽  
Design Tool ◽  
Design Parameters ◽  
Axial Stiffness ◽  
Element Analysis ◽  
Design Assessment ◽  
Design And Optimization ◽  
And Performance

In this paper we disclose how to contour the beams of micro-scale thermomechanical actuators (TMAs) in order to enhance the actuator’s thermal and mechanical performance. In this approach, we vary the cross section of the driving Joule heated beams over the length of the beam. Using this approach, (1) the stored mechanical energy and axial stiffness of beam may be modified to achieve an optimized force-displacement relationship, (2) the maximum achievable thermal strain of a driving beam may be increased by 29%, (3) actuator stroke may be increased by a factor of 3 or more, (4) identical force or displacement characteristics may be achieved with 90% reduction in power. This paper presents the theory and models used to predict the thermal and mechanical behavior of the actuator. The theory and models were used to create a deterministic link between the actuator’s design parameters and the actuator’s performance characteristics. The theory and models were combined within a design tool that shows less than 5% error from non-linear Finite Element Analysis simulations. The design tool has been used to generate plots that enable designers to (1) understand the qualitative relationships between design parameters and performance and (2) select first-pass design parameters. The theory was used to create a design tool, posted at http://psdam.mit.edu, that may be used to perform qualitative design assessment and optimization.

scholarly journals Aerodynamic Shape Optimization of a Missile Using a Multiobjective Genetic Algorithm

2020 ◽  
Vol 2020 ◽  
pp. 1-17
Author(s):  
Ahmet Şumnu ◽  
İbrahim Halil Güzelbey ◽  
Orkun Öğücü
Keyword(s):  
Genetic Algorithm ◽  
Shape Optimization ◽  
Aerodynamic Drag ◽  
The Body ◽  
Design Parameters ◽  
Main Body ◽  
Shape Variation ◽  
Literature Study ◽  
Multiobjective Genetic Algorithm ◽  
Mach Numbers

The aim of this paper is to demonstrate the effects of the shape optimization on the missile performance at supersonic speeds. The N1G missile model shape variation, which decreased its aerodynamic drag and increased its aerodynamic lift at supersonic flow under determined constraints, was numerically investigated. Missile geometry was selected from a literature study for optimization in terms of aerodynamics. Missile aerodynamic coefficient prediction was performed to verify and compare with existing experimental results at supersonic Mach numbers using SST k-omega, realizable k-epsilon, and Spalart-Allmaras turbulence models. In the optimization process, the missile body and fin design parameters need to be estimated to design optimum missile geometry. Lift and drag coefficients were considered objective function. Input and output parameters were collected to obtain design points. Multiobjective Genetic Algorithm (MOGA) was used to optimize missile geometry. The front part of the body, the main body, and tailfins were improved to find an optimum missile model at supersonic speeds. The optimization results showed that a lift-to-drag coefficient ratio, which determines the performance of a missile, was improved about 11-17 percent at supersonic Mach numbers.

scholarly journals Design and Finite Element Analysis of Water Jet Energy Accumulator Barrel

2018 ◽  
Vol 153 ◽  
pp. 06011
Author(s):  
Zhang Yuxian ◽  
Yang mengke ◽  
Wang Hong ◽  
Liu Binbin
Keyword(s):  
Finite Element ◽  
Wall Thickness ◽  
Equivalent Stress ◽  
Structure Design ◽  
Water Jet ◽  
Design Parameters ◽  
The Finite Element Method ◽  
Element Analysis ◽  
Cylinder Model ◽  
Jet Energy

In order to solve the yielding failure problem of water jet energy accumulator barrel due to high pressure, the prestressed composite structure design and the theory of equal strength are used to determine the parameters of accumulator barrel, such as the internal cylinder of the composite cylinder, the radii of the inner and outer cylinders, the radius of sub-layer and the optimal interference. Then the ANSYS software is used to analyze the cylinder model with the finite element method, the equivalent stress of the effective node along the wall thickness of the simulation model is obtained by path extraction method and the distribution curves of the equivalent stress along the wall thickness with different internal pressure are also obtained. By analyzing the simulated results and curves, the design parameters of accumulator barrel meet the expected strength requirement.

Design and Study of Gate-Type Steel-Shuttering Jumbo for Tunnel Lining Based on CAD/CAE

2011 ◽  
Vol 84-85 ◽  
pp. 14-18
Author(s):  
Wei Ping Peng ◽  
Jun Yi Xia ◽  
Zhi Qiang Zhang
Keyword(s):  
Working Conditions ◽  
Three Dimensional ◽  
Structure Design ◽  
Tunnel Lining ◽  
Stress And Strain ◽  
Element Analysis ◽  
Design And Optimization ◽  
Type Steel ◽  
Cae Technology ◽  
Shape And Size

The gate-type steel-shuttering jumbo is key construction equipment for tunnel lining, which is usually designed for customization according to the shape and size of the tunnel. Aiming at the insufficiency of existing methods in the jumbo design, the CAD/CAE technology is introduced into the domains of the jumbo design. In this paper, the gate-type steel-shuttering jumbo for spillway lining in Xiluodu hydropower station is designed, and virtual assembly is established based on three-dimensional digital model using Pro/E software. The stress and strain of the jumbo under different working conditions are analyzed by ANSYS. The result of finite element analysis can be regarded as the basis of structure design and optimization of the jumbo, and can be used to verify the design feasibility at the same time.

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