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Article
Publication date: 10 December 2019

Fei Wang, Yuqiang Liu, Yahui Zhang, Yu Gao, Ling Xiao and Chengdong Wu

A robotic wheelchair system was designed to assist disabled people with disabilities to walk.

Abstract

Purpose

A robotic wheelchair system was designed to assist disabled people with disabilities to walk.

Design/methodology/approach

An anticipated sharing control strategy based on topological map is proposed in this paper, which is used to assist robotic wheelchairs to realize interactive navigation. Then, a robotic wheelchair navigation control system based on the brain-computer interface and topological map was designed and implemented.

Findings

In the field of robotic wheelchairs, the problems of poor use, narrow application range and low humanization are still not improved.

Originality/value

In the system, the topological map construction is not restricted by the environment structure, which helps to expand the scope of application; the shared control system can predict the users’ intention and replace the users’ decision to realize human-machine interactive navigation, which has higher security, robustness and comfort.

Details

Industrial Robot: the international journal of robotics research and application, vol. 47 no. 6
Type: Research Article
ISSN: 0143-991X

Keywords

Article
Publication date: 29 March 2011

Tonglin Liu, Chengdong Wu, Bin Li, Shugen Ma and Jinguo Liu

The purpose of this paper is to describe a shape‐shifting robot with diverse configurations, named “AMOEBA‐I”, which has been developed for search and rescue operations. The…

1051

Abstract

Purpose

The purpose of this paper is to describe a shape‐shifting robot with diverse configurations, named “AMOEBA‐I”, which has been developed for search and rescue operations. The accessibility of this robot to unstructured environment is efficiently enhanced by changing its configuration. So the shape and reconfiguration of the robot should be considered in AMOEBA‐I path planning to improve work ability of the robot in complex environment. The unique accessibility of AMOEBA‐I is thus fully displayed.

Design/methodology/approach

An auto‐adapted path‐planning method is presented for AMOEBA‐I by introducing the reconfigurable ability of the robot into the modified potential field method. The modified potential field method solves the local minimum problem and goal‐unreachable with nearby obstacles (GUWNO) effectively. A method of the shape‐shifting robot's passing through the narrow space is studied by combining the corner detection with the modified potential field method.

Findings

The ability of the robot to automatically change configuration to pass through a narrow space is proven through the experiment. Simulation results show that the robot can change its own configurations to perform auto‐adapted path planning corresponding to the environmental variation. Therefore, the proposed method can improve the probability of completing the path planning. As a result, this method will shorten the path length and complete the rescue operation more effectively.

Originality/value

The paper presents an effective auto‐adapted path‐planning method that integrates the reconfigurable ability of the robot into the modified potential field method in order to realize the auto‐adapted path planning.

Details

International Journal of Intelligent Computing and Cybernetics, vol. 4 no. 1
Type: Research Article
ISSN: 1756-378X

Keywords

Article
Publication date: 21 August 2009

Fei Wang, Chengdong Wu, Xinthe Xu and Yunzhou Zhang

The purpose of this paper is to present a coordinated control strategy for stable walking of biped robot with heterogeneous legs (BRHL), which consists of artificial leg (AL) and…

Abstract

Purpose

The purpose of this paper is to present a coordinated control strategy for stable walking of biped robot with heterogeneous legs (BRHL), which consists of artificial leg (AL) and intelligent bionic leg (IBL).

Design/methodology/approach

The original concentrated control in common biped robot system is replaced by a master‐slave dual‐leg coordinated control. P‐type open/closed‐loop iterative learning control is used to realize the time‐varying gait tracking for IBL to AL.

Findings

The new control architecture can simplify gait planning scheme of BRHL system with complicated closed‐chain mechanism and mixed driving mode.

Research limitations/implications

Designing and constructing a suitable magneto‐rheological damper can greatly improve the control performance of IBL.

Practical implications

Master‐slave coordination strategy is suitable for BRHL stable walking control.

Originality/value

The concepts and methods of dual‐leg coordination have not been explicitly proposed in single biped robot control research before. Master‐slave coordinated control strategy is suitable for complicated BRHL.

Details

Industrial Robot: An International Journal, vol. 36 no. 5
Type: Research Article
ISSN: 0143-991X

Keywords

Article
Publication date: 1 July 2004

Chengdong Wu, Yong Yue, Mengxin Li and Osei Adjei

This paper presents a comprehensive review of the available literature on applications of the rough set theory. Concepts of the rough set theory are discussed for approximation…

2182

Abstract

This paper presents a comprehensive review of the available literature on applications of the rough set theory. Concepts of the rough set theory are discussed for approximation, dependence and reduction of attributes, decision tables and decision rules. The applications of rough sets are discussed in pattern recognition, information processing, business and finance, industry, environment engineering, medical diagnosis and medical data analysis, system fault diagnosis and monitoring and intelligent control systems. Development trends and future efforts are outlined. An extensive list of references is also provided to encourage interested readers to pursue further investigations.

Details

Engineering Computations, vol. 21 no. 5
Type: Research Article
ISSN: 0264-4401

Keywords

Article
Publication date: 13 July 2023

Shian Li, Chongyang Wang, Qiuwan Shen, Yuanzhe Cheng, Chengdong Peng, Guogang Yang and Bengt Ake Sunden

The purpose of this study is to design a new type of cold plate to improve the thermal performance of liquid-cooled thermal management system of lithium-ion batteries.

Abstract

Purpose

The purpose of this study is to design a new type of cold plate to improve the thermal performance of liquid-cooled thermal management system of lithium-ion batteries.

Design/methodology/approach

A cold plate with leaf type channels is proposed to enhance the cooling performance. Effects of the leaf type channel parameters (i.e. channel angle 20°, 40°, 60°, 80°; coolant mass flow rate 0.25 × 10–3, 0.50 × 10–3, 0.75 × 10–3, 1.00 × 10–3, 1.25 × 10–3 kg·s−1; channel number 1, 3, 5, 7) on the performance are numerically investigated by using a 3D mathematical model.

Findings

Compared to the traditional I type channels, the leaf type channels have better cooling performance. It is found that the battery temperature variation and channel pressure drop are decreased with decreasing channel angle and increasing channel number. In addition, the cooling performance can be improved by increasing the coolant mass flow rate.

Practical implications

This study can provide guidance for the development of novel effective cold plates.

Originality/value

The design of cold plates with leaf type channels can be used in liquid-cooled thermal management system to reduce the battery temperature difference.

Details

International Journal of Numerical Methods for Heat & Fluid Flow, vol. 33 no. 10
Type: Research Article
ISSN: 0961-5539

Keywords

Article
Publication date: 18 December 2023

Shian Li, Yuanzhe Cheng, Qiuwan Shen, Chongyang Wang, Chengdong Peng and Guogang Yang

The purpose of this study is to improve the thermal management of lithium-ion batteries. The phase change material (PCM) cooling does not require additional equipment to consume…

Abstract

Purpose

The purpose of this study is to improve the thermal management of lithium-ion batteries. The phase change material (PCM) cooling does not require additional equipment to consume energy. To improve the heat dissipation capacity of batteries, fins are added in the PCM to enhance the heat transfer process.

Design/methodology/approach

Computational fluid dynamics method is used to study the influence of number of vertical fins and ring fins (i.e. 2, 4, 6 and 8 vertical fins, and 2, 3, 4 and 5 ring fins) and the combination of them on the cooling performance.

Findings

The battery maximum temperature can be decreased by the PCM with vertical or ring fins, and it can be further decreased by the combination of them. The PCM with eight vertical fins and five ring fins reduces the battery maximum temperature by 5.21 K. In addition, the temperature and liquid-phase distributions of the battery and PCM are affected by the design of the cooling system.

Practical implications

This work can provide guidelines for the development of new and efficient PCM cooling systems for lithium-ion batteries.

Originality/value

The combination of PCM and fins can be used to reduce the battery maximum temperature and temperature difference.

Details

International Journal of Numerical Methods for Heat & Fluid Flow, vol. 34 no. 3
Type: Research Article
ISSN: 0961-5539

Keywords

Article
Publication date: 20 December 2021

Jingsi Zhang, Liangqun Qi, Chengdong Wang and Xichen Lyu

This study aims to examine how servitization affects the environmental and social performance of manufacturing firms.

1007

Abstract

Purpose

This study aims to examine how servitization affects the environmental and social performance of manufacturing firms.

Design/methodology/approach

The hypotheses are tested using fixed-effect panel models based on secondary data of 1,413 manufacturing firms publicly listed in the USA.

Findings

Results show that servitization is positively related to the social performance of manufacturing firms; this positive relationship is more prominent under high levels of human resource slack. However, the impact of servitization on environmental performance depends on the level of absorptive capacity and human resource slack. Servitization improves environmental performance under high levels of absorptive capacity and human resource slack, while this positive impact is insignificant under low levels of absorptive capacity and human resource slack.

Research limitations/implications

The study focuses on the degree (depth) of servitization but ignores the scope of services provided by manufacturing firms (breadth of servitization).

Practical implications

This research suggests that servitization is an effective way of achieving simultaneous improvements in environmental and social performance. However, high levels of absorptive capacity and human resource slack are needed to achieve this goal.

Originality/value

This study contributes to the servitization literature by demonstrating the environmental and social sustainability benefits of servitization. The findings also highlight the crucial role of absorptive capacity and human resource slack on improving environmental and social performance through servitization.

Details

Journal of Manufacturing Technology Management, vol. 33 no. 3
Type: Research Article
ISSN: 1741-038X

Keywords

Article
Publication date: 26 August 2014

Chengdong Yang, Zhen Ye, Yuxi Chen, Jiyong Zhong and Shanben Chen

This paper aims to solve the problem that the changing of groove size and assembly gap would affect the precision of the multi-pass path planning and the welding quality and…

Abstract

Purpose

This paper aims to solve the problem that the changing of groove size and assembly gap would affect the precision of the multi-pass path planning and the welding quality and realize the automatic welding of a thick plate.

Design/methodology/approach

First, a double-sided double arc welding (DSAW) system with a self-designed passive vision sensor was established, then the image of the groove was captured and the characteristic parameters of groove were extracted by image processing. According to the welding parameters and the extracted geometry size, multi-pass path planning was executed by the DSAW system.

Findings

A DSAW system with a self-designed passive vision sensor was established which can realize the welding thick plate by double-sided double arc by two robots. The clear welding image of the groove was acquired, and an available image processing algorithm was proposed to accurately extract the characteristic parameters of the groove. According to the welding parameters and the extracted geometry size, multi-pass path planning can be executed by the DSAW system automatically.

Originality/value

Gas metal arc welding is used for root welding and filler passes in DSAW. Multi-pass path planning for thick plate by Double-sided Double Arc Welding (DSAW) based on vision sensor was proposed.

Details

Sensor Review, vol. 34 no. 4
Type: Research Article
ISSN: 0260-2288

Keywords

Article
Publication date: 7 June 2023

Wenjing Li and Zhi Liu

In 2016, the Chinese central government decentralized the responsibilities of housing market regulation to the municipal level. This paper aims to assess whether the decentralized…

Abstract

Purpose

In 2016, the Chinese central government decentralized the responsibilities of housing market regulation to the municipal level. This paper aims to assess whether the decentralized market regulation is effective.

Design/methodology/approach

This study first investigates the fundamental drivers of urban housing prices in China. Taking into consideration the factors driving housing prices, the authors further investigate the effectiveness of decentralized housing market regulation by a pre- and post-policy comparison test using a panel data set of 35 major cities for the years from 2014 to 2019.

Findings

The results reveal heterogenous policy effects on housing price growth among cities with a one-year lag in effectiveness. With the decentralized housing market regulation, cities with fast price growth are incentivized to implement tightening measures, while cities with relatively low housing prices and slow price growth are more likely to do nothing or deregulate the markets. The findings indicate that the shift from a centralized housing market regulation to a decentralized one is more appropriate and effective for the individual cities.

Originality/value

Few policy evaluation studies have been done to examine the effects of decentralized housing market regulation on the performance of urban housing markets in China. The authors devise a methodology to conduct a policy evaluation that is important to inform public policy and decisions. This study helps enhance the understanding of the fundamental factors in China’s urban housing markets and the effectiveness of municipal government interventions.

Details

International Journal of Housing Markets and Analysis, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 1753-8270

Keywords

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