Huifeng Xi, Xiangbo Shu, Manjie Chen, Huanliang Zhang, Shi-qing Huang and Heng Xiao
The primary objective of this study is characterizing the anisotropic mechanical properties of corrugated cardboard and simultaneously simulating its drop cushioning dynamic…
Abstract
Purpose
The primary objective of this study is characterizing the anisotropic mechanical properties of corrugated cardboard and simultaneously simulating its drop cushioning dynamic effects under various drop conditions.
Design/methodology/approach
Static and dynamic tests were conducted on corrugated cardboard to obtain adequate experimental data in different directions. An effective anisotropic constitutive model is introduced by developing the honeycomb materials model in ANSYS LS-Dyna, and an effective approach is established toward effectively determining the material parameters from the test data obtained. The model is validated by comparing simulation results with experimental data from five drop conditions, including bottom drop, front drop, side drop, 30° side drop and edge drop. Additionally, simulations are conducted to study the cushioning performance of the packaging by dropping the corrugated cardboard at different heights.
Findings
The study establishes a fast and effective approach to simulating the drop cushioning performance of corrugated cardboard under various drop conditions, which demonstrates good agreement with experimental data.
Originality/value
This approach is of value for packaging protection and provides guidance for stacking of packaging during transportation.
Details
Keywords
Zhiqiang Yu, Qing Shi, Huaping Wang, Ning Yu, Qiang Huang and Toshio Fukuda
The purpose of this paper is to present state-of-the-art approaches for precise operation of a robotic manipulator on a macro- to micro/nanoscale.
Abstract
Purpose
The purpose of this paper is to present state-of-the-art approaches for precise operation of a robotic manipulator on a macro- to micro/nanoscale.
Design/methodology/approach
This paper first briefly discussed fundamental issues associated with precise operation of a robotic manipulator on a macro- to micro/nanoscale. Second, this paper described and compared the characteristics of basic components (i.e. mechanical parts, actuators, sensors and control algorithm) of the robotic manipulator. Specifically, commonly used mechanisms of the manipulator were classified and analyzed. In addition, intuitive meaning and applications of its actuator explained and compared in details. Moreover, related research studies on general control algorithm and visual control that are used in a robotic manipulator to achieve precise operation have also been discussed.
Findings
Remarkable achievements in dexterous mechanical design, excellent actuators, accurate perception, optimized control algorithms, etc., have been made in precise operations of a robotic manipulator. Precise operation is critical for dealing with objects which need to be manufactured, modified and assembled. The operational accuracy is directly affected by the performance of mechanical design, actuators, sensors and control algorithms. Therefore, this paper provides a categorization showing the fundamental concepts and applications of these characteristics.
Originality/value
This paper presents a categorization of the mechanical design, actuators, sensors and control algorithms of robotic manipulators in the macro- to micro/nanofield for precise operation.
Details
Keywords
Xiangdong Gu, Louise T. Higgins, Lixiang Weng and Xiaoye Holt
The aim of this paper is to examine the evolution and development of the selection process and methods used by the Chinese government for appointing public officials.
Abstract
Purpose
The aim of this paper is to examine the evolution and development of the selection process and methods used by the Chinese government for appointing public officials.
Design/methodology/approach
The paper adopts an approach combining literature and document reviews with discussion with field experts.
Findings
China has a long history of selecting the most able individuals for government officials. During the political turmoil of the twentieth century, this was abandoned for ideological reasons. Current selection criteria and process are increasingly based on solid psychology and management approaches.
Research limitations/implications
This paper is an overview of developments in Chinese government official selection approaches and process.
Practical implications
It may serve as a baseline for future research and practice on exploring sound and institutionalized selection methods and processes.
Originality/value
This is an initial attempt to explore senior Chinese officials' selection process.