Lightweight Design for Thin-Walled Cylindrical Shell Based on Action Mechanism of Bamboo Node

2012 ◽  
Vol 135 (1) ◽  
Author(s):  
Denghai Xing ◽  
Wuyi Chen ◽  
Dengjiang Xing ◽  
Tuo Yang
Keyword(s):  
Cylindrical Shell ◽  
Design Method ◽  
Structural Characteristics ◽  
Lightweight Design ◽  
Experimental Models ◽  
Action Mechanism ◽  
Engineering Structures ◽  
Thin Walled ◽  
And Function ◽  
Design Ideas

Lightweight design is needed for many engineering structures, but conventional design methods cannot always meet requirements. Natural organisms have developed many types of structures with excellent properties and ingenious construction, and they can provide many new design ideas. In this paper, a thin-walled cylindrical shell, one of the most common structures, is designed to resist buckling based on the study of bionics. First, the structure and function of bamboo node are described, and a statistical analysis of internode length-to-diameter ratio in bamboo is performed to investigate structural characteristics of bamboo node. Then, through buckling analysis of three relevant experimental models, the action mechanism of bamboo node is investigated, and two rules for application of this structure in engineering are proposed. Finally, a bionic design method is introduced, and a lightweight design for a thin-walled cylindrical shell based on this method is presented. A comparison between the bionic shell and a conventional one shows that the weight was reduced by as much as 20.5%.

scholarly journals User-centred design of humanoid robots’ communication

2020 ◽  
Vol 12 (1) ◽  
pp. 58-73
Author(s):  
Sofia Thunberg ◽  
Tom Ziemke
Keyword(s):  
Mental Models ◽  
Participatory Design ◽  
Humanoid Robot ◽  
State Of The Art ◽  
Design Method ◽  
Humanoid Robots ◽  
Human Robot Interaction ◽  
Robot Interaction ◽  
Design Concepts ◽  
Design Ideas

AbstractInteraction between humans and robots will benefit if people have at least a rough mental model of what a robot knows about the world and what it plans to do. But how do we design human-robot interactions to facilitate this? Previous research has shown that one can change people’s mental models of robots by manipulating the robots’ physical appearance. However, this has mostly not been done in a user-centred way, i.e. without a focus on what users need and want. Starting from theories of how humans form and adapt mental models of others, we investigated how the participatory design method, PICTIVE, can be used to generate design ideas about how a humanoid robot could communicate. Five participants went through three phases based on eight scenarios from the state-of-the-art tasks in the RoboCup@Home social robotics competition. The results indicate that participatory design can be a suitable method to generate design concepts for robots’ communication in human-robot interaction.

Strongly Nonlinear Vibrations of a Hyperelastic Thin-walled Cylindrical Shell Based on the Modified Lindstedt–Poincaré Method

2019 ◽  
Vol 19 (12) ◽  
pp. 1950160 ◽  
Author(s):  
Jing Zhang ◽  
Jie Xu ◽  
Xuegang Yuan ◽  
Wenzheng Zhang ◽  
Datian Niu
Keyword(s):  
Cylindrical Shell ◽  
Nonlinear System ◽  
Differential Equations ◽  
Nonlinear Vibrations ◽  
Harmonic Excitation ◽  
System Of Differential Equations ◽  
Response Curves ◽  
Strongly Nonlinear ◽  
Hardening Behavior ◽  
Thin Walled

Some significant behaviors on strongly nonlinear vibrations are examined for a thin-walled cylindrical shell composed of the classical incompressible Mooney–Rivlin material and subjected to a single radial harmonic excitation at the inner surface. First, with the aid of Donnell’s nonlinear shallow-shell theory, Lagrange’s equations and the assumption of small strains, a nonlinear system of differential equations for the large deflection vibration of a thin-walled shell is obtained. Second, based on the condensation method, the nonlinear system of differential equations is reduced to a strongly nonlinear Duffing equation with a large parameter. Finally, by the appropriate parameter transformation and modified Lindstedt–Poincar[Formula: see text] method, the response curves for the amplitude-frequency and phase-frequency relations are presented. Numerical results demonstrate that the geometrically nonlinear characteristic of the shell undergoing large vibrations shows a hardening behavior, while the nonlinearity of the hyperelastic material should weak the hardening behavior to some extent.

Transport properties of concrete-like granular materials interacted by their microstructures and particle components

2018 ◽  
Vol 32 (18) ◽  
pp. 1840011 ◽  
Author(s):  
Wenxiang Xu ◽  
Hongguang Sun ◽  
Wen Chen ◽  
Huisu Chen
Keyword(s):  
Transport Properties ◽  
Granular Materials ◽  
Soft Matter ◽  
Volume Fraction ◽  
Structural Characteristics ◽  
Effective Diffusion ◽  
Nonspherical Particles ◽  
Structure Property ◽  
Engineering Structures ◽  
Component Structure

Granular materials as typical soft matter, their transport properties play significant roles in durability and service life in relevant practical engineering structures. Physico-mechanical properties of materials are generally dependent of their microstructures including interfacial and porous characteristics. The formation of such microstructures is directly related to particle components in granular materials. Understanding the interactive mechanism of particle components, microstructures, and transport properties is a problem of great interest in materials research community. The resulting rigorous component-structure-property relations are also valuable for material design and microstructure optimization. This review article describes state-of-the-art progresses on modeling particle components, interfacial and porous configurations and incorporating these internal structural characteristics into modeling transport properties of granular materials. We mainly focus on three issues involving the simulation for geometrical components, the quantitative characterization for interfacial and porous microstructures, and the modeling strategies for diffusive behaviors of granular materials. In the first aspect, in-depth reviews are presented to realize complex morphologies of geometrical particles, to detect the overlap between adjacent nonspherical particles, and to simulate the random packings of nonspherical particles. In the second aspect, we emphasize the development progresses on the interfacial thickness and porosity distribution, the interfacial volume fraction, and the continuum percolation of soft particles representing compliant interfaces and discrete pores. In the final aspect, a literature review is also provided on modeling of transport properties on the forefront of the effective diffusion and anomalous diffusion in multiphase granular materials. Finally, some conclusions and perspectives for future studies are provided.

Design method of concrete filled thin-walled steel tube column-foundation connections

2021 ◽  
Vol 246 ◽  
pp. 113033
Author(s):  
Tianxiang Xu ◽  
Sumei Zhang ◽  
Jiepeng Liu ◽  
Xuanding Wang
Keyword(s):  
Design Method ◽  
Steel Tube ◽  
Column Foundation ◽  
Thin Walled

Buckling Design of Axially Compressed Cylindrical Shells Based on Energy Barrier Approach

2021 ◽  
pp. 2150165
Author(s):  
Haigui Fan ◽  
Wenguang Gu ◽  
Longhua Li ◽  
Peiqi Liu ◽  
Dapeng Hu
Keyword(s):  
Experimental Data ◽  
Energy Barrier ◽  
Thin Shell ◽  
Design Method ◽  
Lightweight Design ◽  
Cylindrical Shells ◽  
Design Criterion ◽  
The Other ◽  
Shell Structures ◽  
Buckling Loads

Buckling design of axially compressed cylindrical shells is still a challenging subject considering the high imperfection-sensitive characteristic in this kind of structure. With the development of various design methods, the energy barrier concept dealing with buckling of imperfection-sensitive cylindrical shells exhibits a promising prospect in recent years. In this study, buckling design of imperfection-sensitive cylindrical shells under axial compression based on the energy barrier approach is systematically investigated. The methodology about buckling design based on the energy barrier approach is described in detail first taking advantage of the cylindrical shells whose buckling loads have been extensively tested. Then, validation and discussion about this buckling design method have been carried out by the numerical and experimental analyses on the cylindrical shells with different geometrical and boundary imperfections. Results in this study together with the available experimental data have verified the reliability and advantage of the buckling design method based on energy barrier approach. A design criterion based on the energy barrier approach is therefore established and compared with the other criteria. Results indicate that buckling design based on energy barrier approach can be used as an efficient way in the lightweight design of thin-shell structures.

Methodology of a combined approach: analytical techniques to identify the technology and raw materials used in thin-walled pottery from Herculaneum and Pompeii

2014 ◽  
Vol 6 (10) ◽  
pp. 3490-3499 ◽  
Author(s):  
L. C. Giannossa ◽  
M. Acquaviva ◽  
G. E. De Benedetto ◽  
P. Acquafredda ◽  
R. Laviano ◽  
...  
Keyword(s):  
Raw Materials ◽  
Structural Characteristics ◽  
Analytical Techniques ◽  
Combined Approach ◽  
Thin Walled ◽  
Materials Used

This study focuses on defining compositional and structural characteristics of ceramic bodies and surfaces of thin-walled pottery (2nd cent. BC–3rd cent. AD) in the Vesuvian area.

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