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Open Access
Article
Publication date: 17 September 2020

Tao Peng, Xingliang Liu, Rui Fang, Ronghui Zhang, Yanwei Pang, Tao Wang and Yike Tong

This study aims to develop an automatic lane-change mechanism on highways for self-driving articulated trucks to improve traffic safety.

1669

Abstract

Purpose

This study aims to develop an automatic lane-change mechanism on highways for self-driving articulated trucks to improve traffic safety.

Design/methodology/approach

The authors proposed a novel safety lane-change path planning and tracking control method for articulated vehicles. A double-Gaussian distribution was introduced to deduce the lane-change trajectories of tractor and trailer coupling characteristics of intelligent vehicles and roads. With different steering and braking maneuvers, minimum safe distances were modeled and calculated. Considering safety and ergonomics, the authors invested multilevel self-driving modes that serve as the basis of decision-making for vehicle lane-change. Furthermore, a combined controller was designed by feedback linearization and single-point preview optimization to ensure the path tracking and robust stability. Specialized hardware in the loop simulation platform was built to verify the effectiveness of the designed method.

Findings

The numerical simulation results demonstrated the path-planning model feasibility and controller-combined decision mechanism effectiveness to self-driving trucks. The proposed trajectory model could provide safety lane-change path planning, and the designed controller could ensure good tracking and robust stability for the closed-loop nonlinear system.

Originality/value

This is a fundamental research of intelligent local path planning and automatic control for articulated vehicles. There are two main contributions: the first is a more quantifiable trajectory model for self-driving articulated vehicles, which provides the opportunity to adapt vehicle and scene changes. The second involves designing a feedback linearization controller, combined with a multi-objective decision-making mode, to improve the comprehensive performance of intelligent vehicles. This study provides a valuable reference to develop advanced driving assistant system and intelligent control systems for self-driving articulated vehicles.

Details

Journal of Intelligent and Connected Vehicles, vol. 3 no. 2
Type: Research Article
ISSN: 2399-9802

Keywords

Article
Publication date: 10 July 2023

Jie Sun, X.F. Ge and Yuan Zheng

The research in this paper helps to understand the difference between the Eulerian method and the Lagrangian method in describing the performance of Pelton turbine buckets, so as…

Abstract

Purpose

The research in this paper helps to understand the difference between the Eulerian method and the Lagrangian method in describing the performance of Pelton turbine buckets, so as to improve the design level and design efficiency of the runner.

Design/methodology/approach

This paper used DualSPHysics to calculate the unsteady flow of the Pelton turbine runner bucket and compared it with the mesh-based method to explore the difference between mesh-based and particle-based methods in torque curves, jet flow patterns and pressure characteristics.

Findings

It is noted that the particle-based method is challenging to compare with the mesh-based method concerning accuracy. In addition to better describing the free water film, the particle method also captures many droplets near the water film, but it cannot well describe the negative pressure region on the bucket back and the resulting jet interference after cutting off the jet. Compared with the mesh-based method, the pressure measurement points obtained by the particle-based method generally have shorter periods and violent fluctuations, and the pressure value of some points is underestimated.

Originality/value

This paper helped to calculate the unsteady characteristics of the Pelton turbine by Fluent, CFX and DualSPHysics; exploration jet flow pattern differences between the mesh and meshfree methods; prediction of the flow interference between the bucket back and the jet and the pressure curve of SPH usually has a shorter period and violent fluctuations.

Details

Engineering Computations, vol. 40 no. 5
Type: Research Article
ISSN: 0264-4401

Keywords

Article
Publication date: 31 July 2021

Jianyu Zhao, Shengliang Li, Xi Xi and Caiyan Gong

Because the discontinuous and uncertain characteristics of knowledge-based innovation cannot be reasonably interpreted by conventional management approaches, quantum mechanics…

Abstract

Purpose

Because the discontinuous and uncertain characteristics of knowledge-based innovation cannot be reasonably interpreted by conventional management approaches, quantum mechanics which begins with uncertainty and concerns with a dynamic process of the complex system, has been exploratorily used in the management field. Although the theoretical new insights are provided by pioneering studies, quantitative research is in short supply. This paper aims to propose a quantum mechanics-based framework for quantitative research, thus extending the application of quantum mechanics in the knowledge management area from a dynamic system evolutionary standpoint.

Design/methodology/approach

Based on the similarity comparison between knowledge-based system evolution and atomic motion, the authors construct the atom-like structure of the knowledge-based system and elaborate the evolutionary mechanism of the knowledge-based system, thereby establishing the quantitative model. Apple and Zhongxing Telecom Equipment were selected for an empirical study to demonstrate the usefulness of the models for research on knowledge-based innovation and explore the unique knowledge-based innovation characteristics of the two firms.

Findings

First, the transition force of dynamic knowledge shows an inverted U shape; accumulating dynamic knowledge to a moderate degree not only facilitates transforming dynamic knowledge into static knowledge but also balances the relationship between the influence of knowledge force range and dynamic knowledge transformation. Second, existing knowledge is gradually substituted by new knowledge and knowledge density at a high knowledge energy level distinctly increases with a narrower bandwidth. Third, the investment loss is associated with resource configuration, resource utilization and the amount of accumulative dynamic knowledge before investment. Knowledge loss is negatively correlated with the knowledge compatibility coefficient.

Research limitations/implications

The authors use the advanced method in quantum mechanics to legitimately unveil the emergence mechanism of knowledge-based innovation. Meanwhile, the authors capture the non-linear transformation relationship of heterogeneous knowledge and expose the change in ways of both investment loss and knowledge loss that cannot be quantified by conventional models. In doing so, the authors not only reveal the principle of qualitative knowledge change but also offer practical implications for developing flexible and targeted innovation strategies.

Originality/value

First, by proposing a complete quantum mechanics-based framework, the authors not only supplement the quantitative research contents to knowledge-based innovation literature which proposed calls to conduct research in way of quantum mechanics but also overcome the difficulties of knowledge-based system conceptualization and measurement. Second, the authors reveal the uncertain change of knowledge transformation and measure the loss of investment and knowledge, which contribute to identifying defects of firms in knowledge-based innovation. Third, the authors explore the internal mechanism that led to knowledge-based innovation exhibits non-linear characteristics and capture unique dynamic relationships between different variables which affect the emergence of knowledge-based innovation.

Details

Journal of Knowledge Management, vol. 26 no. 3
Type: Research Article
ISSN: 1367-3270

Keywords

Article
Publication date: 24 October 2021

Quan Zhai, Jicheng Zhang, Guofeng Du, Yulong Rao and Xiaoyu Liu

At present, piezoelectric impedance technology has been used in the study of wood damage monitoring. However, little effort has been made in the research on the application of…

Abstract

Purpose

At present, piezoelectric impedance technology has been used in the study of wood damage monitoring. However, little effort has been made in the research on the application of piezoelectric impedance system to monitor the change of wood moisture content (MC). The monitoring method of wood MC is used by piezoelectric impedance technique in this study.

Design/methodology/approach

One piezoceramic transducer is bonded to the surface of wood specimens. The MC of the wood specimens increases gradually from 0% to 60% with 10% increments; the mechanical impedance of the wood specimen will change, and the change in the mechanical impedance of the structure is reflected by monitoring the change in the electrical impedance of lead zirconate titanate. Therefore, this paper investigates the relationship between wood MC change and piezoelectric impedance change to verify the feasibility of the piezoelectric impedance method for monitoring wood MC change.

Findings

The experiment verified that the real part of impedance of the wood increased with the increase of wood MC. Besides, the damage index root mean square deviation is introduced to quantify the damage degree of wood under different MC. At the same time, the feasibility and validity of this experiment were verified from the side by finite element simulation. Finally, MC monitoring by piezoelectric impedance technique is feasible.

Originality/value

To the best of the authors’ knowledge, this work is the first to apply piezoelectric ceramics to the monitoring of wood MC, which provides a theoretical basis for the follow-up study of a wide range of wood components and even wood structure MC changes.

Details

Sensor Review, vol. 42 no. 1
Type: Research Article
ISSN: 0260-2288

Keywords

Book part
Publication date: 12 April 2019

William J. Schell

The purpose of this chapter is to provide the reader with tools to help change their organizational culture. Specifically, this chapter investigates the importance of leadership…

Abstract

The purpose of this chapter is to provide the reader with tools to help change their organizational culture. Specifically, this chapter investigates the importance of leadership in understanding and changing culture within organizations and explores different change management models to effectively change culture within organizations. This chapter summarizes tools from the Leadership and Change Management literature, including findings from the author’s studies, and best practices from a variety of industries.

Tools are provided so that readers can target leadership changes in preparation for cultural change. Leadership behaviors at the top of an organization are discussed using the full-range leadership model, with a specific focus on understanding, developing, and harnessing transformational leadership behaviors within an organization. Leadership at the top of an organization is complemented with a discussion of the importance of middle leadership throughout the organization including a model to understand and develop those behaviors. The chapter ends with seven different approaches to structuring and managing change that organizations can adopt to improve the probability of driving successful change in their organizations.

For organizations seeking to develop or improve their safety culture, these tools provide a roadmap for harnessing the needed leadership behaviors and organizational tools to effectively make change. By understanding and applying these tools, organizations can find success in their culture change initiatives faster and with fewer problems.

Article
Publication date: 11 March 2019

Guoda Chen, Huafeng Yang, Huiqiang Cao, Shiming Ji, Xi Zeng and Qian Wang

For the climbing rod object with large diameter variation and the need of obstacle crossing, this paper aims to propose a new embracing-type climbing robot named as EVOC-I robot.

Abstract

Purpose

For the climbing rod object with large diameter variation and the need of obstacle crossing, this paper aims to propose a new embracing-type climbing robot named as EVOC-I robot.

Design/methodology/approach

The design philosophy and structural scheme are introduced. The kinematic analysis of embracing and telescoping mechanisms is carried out to provide the theoretical foundation for the effective climbing of the robot. Based on the prototype robot, three preliminary experiments are carried out to verify the effectiveness of the designed robot.

Findings

The theoretical and experimental analyses have verified the reasonability and effectiveness of the proposed robot design.

Research limitations/implications

As the preliminary study, the prototype still need a lot of improvement. The experimental verification is also limited. Future work will focus on improving the design and increasing the theoretical analysis, especially increasing experimental study and designing the next generation of the rod climbing robot.

Practical implications

The designed climbing robot can be used for climbing the rod with variation diameter and flange obstacle, especially the lightening rod in the transformer substation.

Originality/value

The paper designs a new climbing robot that integrates the ability of large variation diameter adaptation and obstacle crossing.

Details

Industrial Robot: the international journal of robotics research and application, vol. 46 no. 1
Type: Research Article
ISSN: 0143-991X

Keywords

Article
Publication date: 3 May 2016

Hong Men, Bin Sun, Xiao Zhao, Xiujie Li, Jingjing Liu and Zhiming Xu

The purpose of this study is to analyze the corrosion behavior of 304SS in three kinds of solution, 3.5 per cent NaCl, 5 per cent H2SO4 and 1 M (1 mol/L) NaOH, using…

Abstract

Purpose

The purpose of this study is to analyze the corrosion behavior of 304SS in three kinds of solution, 3.5 per cent NaCl, 5 per cent H2SO4 and 1 M (1 mol/L) NaOH, using electrochemical noise.

Design/methodology/approach

Corrosion types and rates were characterized by spectrum and time-domain analysis. EN signals were evaluated using a novel method of phase space reconstruction and chaos theory. To evaluate the chaotic characteristics of corrosion systems, the delay time was obtained by the mutual information method and the embedding dimension was obtained by the average false neighbors method.

Findings

The varying degrees of chaos in the corrosion systems were indicated by positive largest Lyapunov exponents of the electrochemical potential noise.

Originality/value

The change of correlation dimension in three kinds of solution demonstrated significant differences, clearly differentiating various types of corrosion.

Details

Anti-Corrosion Methods and Materials, vol. 63 no. 3
Type: Research Article
ISSN: 0003-5599

Keywords

Article
Publication date: 1 October 2001

Femida Handy

Several policy alternatives exist to protect environmental quality. Environmental nonprofits advocating for better environmental quality must often choose what policies to…

1691

Abstract

Several policy alternatives exist to protect environmental quality. Environmental nonprofits advocating for better environmental quality must often choose what policies to advocate and support. This article argues that environmental nonprofits will do best by designing strategies of advocacy contingent on the net costs to the stakeholders and paying attention to the crowding‐out effects of monetary incentives. It investigates the advocacy policies of 50 environmental organizations in Canada. The findings of this survey show that although reduction of net costs is espoused, market‐based policies are not generally advocated, while a greater emphasis is put on regulatory approaches combined with moral suasion through the dissemination of information and educational programs.

Details

International Journal of Social Economics, vol. 28 no. 8
Type: Research Article
ISSN: 0306-8293

Keywords

Article
Publication date: 4 October 2011

Lin Runhui, Fan Jianhong, Zhao Yang, Zhang Hongjuan and Hou Rujing

The purpose of this paper is to focus on the relationship between the corporate governance (CG) environment, governance behavior and governance performance and place it into the…

1278

Abstract

Purpose

The purpose of this paper is to focus on the relationship between the corporate governance (CG) environment, governance behavior and governance performance and place it into the research of the evolution and revolution of the Chinese telecommunication industry, a complex economic system.

Design/methodology/approach

On the basis of information about the Chinese telecommunication industry from 1949 to 2009 and China Mobile from 1997 to 2007, the authors analyze the Chinese telecommunication industry from two levels, namely industry level and firm level, with the combination of a critical incident method and time series method.

Findings

The results demonstrate that the evolution of the Chinese CG environment and governance behavior presents characteristics of punctuated equilibrium; governance behavior lags behind governance environment and it can cause the governance environment to evolve to benefit its development through exerting active effects; governance environment and governance performance strongly relate to and have an effect on each other; and the improvement of governance structure and mechanisms, together with the enhancement of strategic capability, can greatly contribute to the governance performance of firms.

Originality/value

This paper has divided the development of the Chinese telecommunication industry into four stages, revealing the relationship between governance environment, governance behavior and governance performance with a case study of the Chinese telecommunication industry and China Mobile.

Article
Publication date: 1 July 2003

Jeff Austin and Beth Currie

This paper has its roots in a presentation made at CoreNet Global Summit in November 2002 in San Diego, California. In that talk, the authors briefly explained the field of human…

3095

Abstract

This paper has its roots in a presentation made at CoreNet Global Summit in November 2002 in San Diego, California. In that talk, the authors briefly explained the field of human dynamics and change, and explored, through some actual experiences, the application of change management practices that Wachovia used to lead and nurture organisational change. This paper seeks to make more explicit these hidden forces by giving a more detailed overview of the theory of human dynamics as they relate to change, and some strategies for applying this theory for more effective change management. The venue for this exploration will be Wachovia Corporate Real Estate (CRE) Division’s experience, with significant organisational change required to respond to external and market conditions which threatened its continued success as an organisation. The reader will learn how to understand the human dynamics relating to change; obtain tools for communicating change concepts; find resources to help lead change; ensure that people deal more successfully with organisational change; and measure the significance of human dynamics to business performance.

Details

Journal of Facilities Management, vol. 2 no. 3
Type: Research Article
ISSN: 1472-5967

Keywords

21 – 30 of over 38000