Applying central pattern generators to control the robofish with oscillating pectoral fins

2015 ◽  
Vol 42 (5) ◽  
pp. 392-405 ◽  
Author(s):  
Yong Cao ◽  
Shusheng Bi ◽  
Yueri Cai ◽  
Yuliang Wang
Keyword(s):  
Design Methodology ◽  
Three Dimensional ◽  
Central Pattern Generators ◽  
Content Type ◽  
Pectoral Fins ◽  
Cownose Ray ◽  
Pattern Generators ◽  
And Control ◽  
Scientific Tool ◽  
Oscillation Characteristics

Purpose – This paper aims to develop a robofish with oscillating pectoral fins, and control it to mimic the bionic prototype by central pattern generators (CPGs). Design/methodology/approach – First, the oscillation characteristics of the cownose ray were analyzed quantitatively. Second, a robofish with multi-joint pectoral fins was developed according to the bionic morphology and kinematics. Third, the improved phase oscillator was established, which contains a spatial asymmetric coefficient and a temporal asymmetric coefficient. Moreover, the CPG network is created to mimic the cownose ray and accomplish three-dimensional (3D) motions. Finally, the experiments were done to test the authors ' works. Findings – The results demonstrate that the CPGs is effective to control the robofish to imitate the cownose ray realistically. In addition, the robofish is able to accomplish 3D motions of high maneuverability, and change among different swimming modes quickly and smoothly. Originality/value – The research provides the method to develop a robofish from both 3D morphology and kinematics. The motion analysis and CPG control make sure that the robofish has the features of high maneuverability and camouflage. It is useful for military underwater applications and underwater detections in narrow environments. Second, this work lays the foundation for the autonomous 3D control. Moreover, the robotic fish can be taken as a scientific tool for the fluid bionics research.

A biomimetic cownose ray robot fish with oscillating and chordwise twisting flexible pectoral fins

2015 ◽  
Vol 42 (3) ◽  
pp. 214-221 ◽  
Author(s):  
Hongwei Ma ◽  
Yueri Cai ◽  
Yuliang Wang ◽  
Shusheng Bi ◽  
Zhao Gong
Keyword(s):  
Swimming Performance ◽  
Robotic Fish ◽  
Small Radius ◽  
Water Tank ◽  
Pectoral Fin ◽  
Content Type ◽  
Pectoral Fins ◽  
Propulsion Performance ◽  
Cownose Ray ◽  
And Control

Purpose The paper aims to develop a cownose ray-inspired robotic fish which can be propelled by oscillating and chordwise twisting pectoral fins. Design/methodology/approach The bionic pectoral fin which can simultaneously realize the combination of oscillating motion and chordwise twisting motion is designed based on analyzing the movement of cownose ray’s pectoral fins. The structural design and control system construction of the robotic fish are presented. Finally, a series of swimming experiments are carried out to verify the effectiveness of the design for the bionic pectoral fin. Findings The experimental results show that the deformation of the bionic pectoral fin can be well close to that of the cownose ray’s. The bionic pectoral fin can produce effective angle of attack, and the thrust generated can propel robotic fish effectively. Furthermore, the tests of swimming performance in the water tank show that the robotic fish can achieve a maximum forward speed of 0.43 m/s (0.94 times of body length per second) and an excellent turning maneuverability with a small radius. Originality/value The oscillating and pitching motion can be obtained simultaneously by the active control of chordwise twisting motion of the bionic pectoral fin, which can better imitate the movement of cownose ray’s pectoral fin. The designed bionic pectoral fin can provide an experimental platform for further study of the effect of the spanwise and chordwise flexibility on propulsion performance.

A biomimetic 3D airflow sensor made of an array of two piezoelectric metal-core fibers

Sensor Review ◽  
2017 ◽  
Vol 37 (3) ◽  
pp. 312-321 ◽  
Author(s):  
Yixiang Bian ◽  
Can He ◽  
Kaixuan Sun ◽  
Longchao Dai ◽  
Hui Shen ◽  
...  
Keyword(s):  
Design Methodology ◽  
Spherical Surface ◽  
Three Dimensional ◽  
Three Dimensions ◽  
Piezoceramic Cylinder ◽  
Metal Core ◽  
Content Type ◽  
3D Space ◽  
Highly Sensitive ◽  
Airflow Sensor

Purpose The purpose of this paper is to design and fabricate a three-dimensional (3D) bionic airflow sensing array made of two multi-electrode piezoelectric metal-core fibers (MPMFs), inspired by the structure of a cricket’s highly sensitive airflow receptor (consisting of two cerci). Design/methodology/approach A metal core was positioned at the center of an MPMF and surrounded by a hollow piezoceramic cylinder. Four thin metal films were spray-coated symmetrically on the surface of the fiber that could be used as two pairs of sensor electrodes. Findings In 3D space, four output signals of the two MPMFs arrays can form three “8”-shaped spheres. Similarly, the sensing signals for the same airflow are located on a spherical surface. Originality/value Two MPMF arrays are sufficient to detect the speed and direction of airflow in all three dimensions.

Comparison of the reluctance laminated and solid rotor synchronous machine operating at high temperatures

2019 ◽  
Vol 38 (4) ◽  
pp. 1111-1119 ◽  
Author(s):  
Marcin Lefik ◽  
Krzysztof Komeza ◽  
Ewa Napieralska-Juszczak ◽  
Daniel Roger ◽  
Piotr Andrzej Napieralski
Keyword(s):  
High Speed ◽  
Design Methodology ◽  
Three Dimensional ◽  
Synchronous Machine ◽  
Point Of View ◽  
Heat Sources ◽  
Model Calculations ◽  
Content Type ◽  
Thermal Phenomenon ◽  
Practical Implications

Purpose The purpose of this paper is to present a comparison between reluctance synchronous machine-enabling work at high internal temperature (HT° machine) with laminated and solid rotor. Design/methodology/approach To obtain heat sources for the thermal model, calculations of the electromagnetic field were made using the Opera 3D program including effect of rotation and the resulting eddy current losses. To analyse the thermal phenomenon, the 3D coupled thermal-fluid (CFD) model is used. Findings The presented results show clearly that laminated construction is much better from a point of view of efficiency and temperature. However, solid construction can be interesting for high speed machines due to their mechanical robustness. Research limitations/implications The main problem, despite the use of parallel calculations, is the long calculation time. Practical implications The obtained simulation and experimental results show the possibility of building a machine operating at a much higher ambient temperature than it was previously produced for example in the vicinity of the aircraft turbines. Originality/value The paper presents the application of fully three-dimensional coupled electromagnetic and thermal analysis of new machine constructions designed for elevated temperature.

Buckling analysis of a delaminated panel by using a kinematic global-local coupling approach

2014 ◽  
Vol 5 (4) ◽  
pp. 262-278
Author(s):  
A. Sellitto ◽  
R. Borrelli ◽  
F. Caputo ◽  
A. Riccio ◽  
F. Scaramuzzino
Keyword(s):  
Design Methodology ◽  
Three Dimensional ◽  
Matrix Cracking ◽  
Composite Panel ◽  
Stiffened Panel ◽  
Local Approach ◽  
Content Type ◽  
Kinematic Coupling ◽  
Coupling Approach ◽  
Delamination Front

Purpose – The purpose of this paper is to investigate on the behaviour of a delaminated stiffened panel; the delamination growth is simulated via fracture elements implemented in B2000++® code based on the Modified Virtual Crack Closure Technique (MVCCT), matrix cracking and fibre failure have been also taken into account. Design/methodology/approach – In order to correctly apply the MVCCT on the delamination front a very fine three-dimensional (3D) mesh is required very close to the delaminated area, while a 2D-shell model has been employed for the areas of minor interest. In order to couple the shell domain to the solid one, shell-to-solid coupling elements based on kinematic constraints have been used. Findings – Results obtained with the global/local approach are in good correlation with those obtained with experimental results. Originality/value – The global/local approach based on kinematic coupling elements in conjunction with fracture elements allows to investigate and predict the behaviour of a stiffened delaminated composite panel in an efficient and effective way.

G-GERT network model of online public opinion reversal based on kernel and grey degree

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Shuli Yan ◽  
Xiangyan Zeng ◽  
Pingping Xiong ◽  
Na Zhang
Keyword(s):  
Public Opinion ◽  
Network Model ◽  
Design Methodology ◽  
Average Frequency ◽  
Decision Makers ◽  
Content Type ◽  
Gert Network ◽  
Frequency Probability ◽  
And Control ◽  
Difficult Issue

PurposeIn recent years, online public opinion reversal incidents have been occurring frequently, which has increased the complexity of the evolution of online public opinion, and they have become a difficult issue for public opinion management and control. It is of great significance to explore the regularity of online public opinion reversal.Design/methodology/approachCombined with the grey characteristics of online public opinion information, a grey graphical evaluation review technique (G-GERT) network model is constructed based on kernel and grey degree, and the frequency, probability and time of online public opinion reversal nodes are calculated using C-marking method and Z-marking method.FindingsThroughout the online public opinion reversal events, there are all repeated outbreak nodes occurring, so the authors regard the repeated occurrence of outbreak nodes as reversal. According to the average frequency, probability and time of repeated outbreak nodes in the G-GERT network model, the authors predict the corresponding key information of reversal. It can simulate the evolution process of public opinion events accurately.Originality/valueThe G-GERT network model based on kernel and grey degree reveals the regulation of public opinion reversal, predicts the frequency, probability and time of reversal nodes, which are the most concerned and difficult issues for decision-makers. The model provides the decision basis and reference for government decision-making departments.

Hong Kong’s response to COVID-19: a glance to the control measures and their enforcement

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Ka Ki Lawrence Ho ◽  
Ying-Tung Chan
Keyword(s):  
Hong Kong ◽  
Infection Rate ◽  
Government Policy ◽  
Design Methodology ◽  
Control Measures ◽  
Content Type ◽  
The Government ◽  
And Control ◽  
Viral Outbreak

Purpose This study aims to examine Hong Kong’s responses to COVID-19, arguing that Hong Kong’s relatively low infection rate is due to self-discipline of citizens together with the enforcement measures introduced by the government. Design/methodology/approach This study reviewed the government policy announcements and the prevailing scholarly analyses on Hong Kong society during COVID-19. Findings It starts by examining the partial lockdown and control measures since mid-January, and the roles of different government units in enforcement were examined and assessed. Suppression of viral outbreak in Hong Kong should primarily be attributed to the appropriate lockdown and quarantine actions of the government. Originality/value However, outperformance of the frontline professionals and the highly aware, self-disciplined and mutually aided citizens in the community are also the key to the “interim success” by June 2020 in the highly accessible and densely populated city.

Service quality function deployment by the C-shaped QFD 3D matrix

2018 ◽  
Vol 25 (9) ◽  
pp. 3386-3405 ◽  
Author(s):  
Maryam Hassani ◽  
Arash Shahin ◽  
Manouchehr Kheradmandnia
Keyword(s):  
Quality Function Deployment ◽  
Design Methodology ◽  
Three Dimensional ◽  
Two Dimensional ◽  
Customer Requirements ◽  
Content Type ◽  
Process Characteristics ◽  
The Matrix ◽  
3D Matrix ◽  
Simultaneous Comparison

Purpose The purpose of this paper is to examine the application of C-shaped QFD 3D Matrix in comparing process characteristics (PC), performance aspects (PA) and customer requirements, simultaneously and to prioritize the first two sets, respectively. Design/methodology/approach A three dimensional matrix has been developed with three sets of PC, PA and customers’ requirements and C-shaped matrix has been applied for simultaneous comparison of the dimensions and prioritization of the subsets of PC and PA. The proposed approach has been examined in a post bank. Findings Findings confirm the possibility of simultaneous comparison and prioritization of the three sets of dimensions of this study in post bank services. In addition, “growth and learning” and “bilateral relationship with suppliers” had the first priorities among PA and PC, respectively. Research limitations/implications While the proposed approach has many advantages, filling the matrixes is time-consuming. Since illustrating the 3D matrix was not possible, the matrix was separated into five two-dimensional matrixes. Originality/value Compared to the studied literature, the proposed approach is practically new in the post bank services.

scholarly journals Evaluation and control of opinion polarization and disagreement: a review

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Yuejiang Li ◽  
Hong Zhao
Keyword(s):  
Design Methodology ◽  
Crucial Importance ◽  
Content Type ◽  
Recent Advances ◽  
And Control

Purpose The purpose of this paper is to review the recent studies on opinion polarization and disagreement. Design/methodology/approach In this work, recent advances in opinion polarization and disagreement and pay attention to how they are evaluated and controlled are reviewed. Findings In literature, three metrics: polarization, disagreement and polarization-disagreement index are usually adopted and there is a tradeoff between polarization and disagreement. Different strategies have been proposed in literature which can significantly control opinion polarization and disagreement based on these metrics. Originality/value This review is of crucial importance to summarize works on opinion polarization and disagreement and to the better understanding and control of them.

Spaces of performance: a storytelling approach to learning in higher education

2018 ◽  
Vol 25 (6) ◽  
pp. 410-421 ◽  
Author(s):  
Kenneth Mølbjerg Jørgensen
Keyword(s):  
Higher Education ◽  
Learning Organization ◽  
Design Methodology ◽  
Theoretical Discussion ◽  
Content Type ◽  
Approach To Learning ◽  
Conditions For Learning ◽  
Research And Teaching ◽  
And Control ◽  
Practical Implications

Purpose The purpose of the paper is to provide a framework for reflecting on how different ways of configuring spaces in higher education (HE) condition the possibilities of learning. Second, the purpose is to construct a storytelling approach for the configuration of such spaces. Design/methodology/approach The paper’s conceptual purpose is achieved through a theoretical discussion of three concepts: performance, politics and storytelling. Findings Learning in HE needs reconsideration in terms of what kinds of learning are made possible through the discursive and material configuration of the spaces of research and teaching. In particular, the focus to some extent should move away from the management and control of learning toward what enables learning. Practical implications The literature on organizational learning and the learning organization comprise concepts, methods and tools that play different roles with regard to controlling, shaping and enabling learning. When the focus is on learning in HE, it is important to be aware of the tracks of learning these technologies enable. Social implications The interest in managing and controlling learning is often problematic in relation to the potential of HE to produce new and innovative forms of learning. Originality/value This paper introduces the term “spaces of performance,” which directs attention toward the material, discursive and relational conditions for learning. It also introduces a space of storytelling as a new principle for learning in HE.

Seven information practices for alleviating information vulnerability

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Devendra Dilip Potnis ◽  
Joseph Winberry
Keyword(s):  
Literature Review ◽  
Design Methodology ◽  
Information Science ◽  
Information Access ◽  
Three Dimensional ◽  
Content Type ◽  
Information Practices ◽  
Information Professionals ◽  
Practical Implications ◽  
Real World Problems

PurposeThis literature review aims to identify conscious, intentional, repetitive and transferrable information-related decisions and activities (i.e. information practices) for individuals to alleviate their information vulnerability. Information vulnerability refers to the lack of access to accurate, affordable, complete, relevant and timely information or the inability to use such information, which can place individuals, communities or society at disadvantage or hurt them.Design/methodology/approachConceptual literature review.FindingsThis review presents seven conscious, intentional, repetitive and transferrable information practices to alleviate information vulnerability.Practical implicationsDue to the transferability potential of the seven information practices, diverse populations in varied contexts could refer to, adapt and benefit from appropriate combinations of information practices and their manifestations. The framework can be used by individuals for alleviating information vulnerability. Thus, this paper responds to the call for conducting action-driven research in information science for addressing real-world problems. Information professionals can help individuals select and implement appropriate combinations of seven information practices for alleviating information vulnerability.Originality/valueWe propose (1) a parsimonious, episodic framework for alleviating information vulnerability, which depicts the inter-relationship among the seven information practices and (2) a three-dimensional plot with information access, use and value as three axes to map the manifestation and outcome of alleviating information vulnerability.

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