A Stiffness Modeling Approach for Multi-Leaf Spring Mechanism Supporting Coupling Error Analysis of Nano- Stages

Shuai-Shuai Lu,Peng Yan 한국정밀공학회 2017 International Journal of Precision Engineering and Vol.18 No.6

In the present paper, we take the multi-leaf spring mechanism as a particular element to develop a modeling approach for the stiffness by considering the coupling effects of the cross axis force. With this, a more accurate model of the multi-leaf spring based nano-stage is derived by incorporating the effect of cross axis input force, which can better predict the coupling error. The new analytical model indicates that the total axial stiffness is an inverse-quadratic function of the cross axis input load instead of a constant value, which can be used to analyze the cross axis coupling error of multi-leaf spring based nano-stages. The proposed analysis method is then verified by FEA and experiments, where excellent results are demonstrated in predicting the cross axis coupling effects of nano-stages such as stiffness variation and coupling error. The proposed approach offers a new look into the design and manipulation of multileaf spring based nano-stages.

Removal of sulfur element from high-sulfur coal by superconducting HGMS technology

Shuai-shuai Han,Su-qin Li,Rui-ming Yang,Chang-qiao Yang,Yi Xing 한국초전도.저온공학회 2019 한국초전도저온공학회논문지 Vol.21 No.2

Coal is the most abundant fossil fuel on Earth and is used in a wide range of applications. The direct combustion of high-sulfur coal produces a large amount of sulfur dioxide, which is a toxic and corrosive gas. A new superconducting high gradient magnetic separation (HGMS) technology was studied to remove sulfur from high sulfur coal. The magnetic separation concentrate was obtained under the optimum parameters, such as a particle size of -200 mesh, a magnetic field strength of 2.0 T, a slurry concentration of 15 g/L, and a slurry flow rate of 600 ml/min. The removal rate of sulfur is up to 59.9%. The method uses a magnetic field to remove sulfur-containing magnetic material from a pulverized coal solution. It is simple process with, high efficiency, and is a new way.

Removal of sulfur element from high-sulfur coal by superconducting HGMS technology

Han, Shuai-shuai,Li, Su-qin,Yang, Rui-ming,Yang, Chang-qiao,Xing, Yi The Korea Institute of Applied Superconductivity a 2019 한국초전도저온공학회논문지 Vol.21 No.2

Coal is the most abundant fossil fuel on Earth and is used in a wide range of applications. The direct combustion of high-sulfur coal produces a large amount of sulfur dioxide, which is a toxic and corrosive gas. A new superconducting high gradient magnetic separation (HGMS) technology was studied to remove sulfur from high sulfur coal. The magnetic separation concentrate was obtained under the optimum parameters, such as a particle size of -200 mesh, a magnetic field strength of 2.0 T, a slurry concentration of 15 g/L, and a slurry flow rate of 600 ml/min. The removal rate of sulfur is up to 59.9%. The method uses a magnetic field to remove sulfur-containing magnetic material from a pulverized coal solution. It is simple process with, high efficiency, and is a new way.

Construction of magnetic nanochains to achieve magnetic energy coupling in scaffold

Cijun Shuai,Xuan Chen,Chongxian He,Guowen Qian,Yang Shuai,SHUPING PENG,Youwen Deng,Wenjing Yang 한국생체재료학회 2022 생체재료학회지 Vol.26 No.3

Background: Fe3O4 nanoparticles are highly desired for constructing endogenous magnetic microenvironment in scaffold to accelerate bone regeneration due to their superior magnetism. However, their random arrangement easily leads to mutual consumption of magnetic poles, thereby weakening the magnetic stimulation effect. Methods: In this study, magnetic nanochains are synthesized by magnetic-field-guided interface co-assembly of Fe3O4 nanoparticles. In detail, multiple Fe3O4 nanoparticles are aligned along the direction of magnetic force lines and are connected in series to form nanochain structures under an external magnetic field. Subsequently, the nanochain structures are covered and fixed by depositing a thin layer of silica (SiO2), and consequently forming linear magnetic nanochains (Fe3O4@SiO2). The Fe3O4@SiO2 nanochains are then incorporated into poly l-lactic acid (PLLA) scaffold prepared by selective laser sintering technology. Results: The results show that the Fe3O4@SiO2 nanochains with unique core–shell structure are successfully constructed. Meanwhile, the orderly assembly of nanoparticles in the Fe3O4@SiO2 nanochains enable to form magnetic energy coupling and obtain a highly magnetic micro-field. The in vitro tests indicate that the PLLA/Fe3O4@SiO2 scaffolds exhibit superior capacity in enhancing cell activity, improving osteogenesis-related gene expressions, and inducing cell mineralization compared with PLLA and PLLA/Fe3O4 scaffolds. Conclusion: In short, the Fe3O4@SiO2 nanochains endow scaffolds with good magnetism and cytocompatibility, which have great potential in accelerating bone repair

A Trajectory Tracking Method for Wheeled Mobile Robots Based on Disturbance Observer

Shuai Wang,Junyong Zhai 제어·로봇·시스템학회 2020 International Journal of Control, Automation, and Vol.18 No.8

In this article, an adaptive tracking control method is proposed for wheeled mobile robots (WMR). In thetrajectory tracking control of WMR, skidding and slipping are taken into account, and the slip degree parameters areintroduced. The disturbance observer is designed to estimate the total disturbances. Then, we design the adaptivecontroller to guarantee that the tracking errors asymptotically converge to zero, the stability of the system is provedby Lyapunov theory. Finally, the simulation results are provided to demonstrate the effectiveness of the proposedscheme.

The Factors Affecting on the Franchisor's Performance, Satisfaction and Recontract Intention : Focusing on the Chinese Franchise Market

Shuai Su,Jun Zhang 한국유통과학회 2012 KODISA ICBE (International Conference on Business Vol.2012 No.-

In this research, we investigate the factors affecting on the recontract intension of franchisor in the uprising Chinese franchise market. Based on the previous study, we extract the four constructs: characteristics of franchisor, features of franchisee, relationship, and environmental uncertainty. We hypothesize that these four factors influence the performance and satisfaction of franchisor, and both performance and satisfaction influence its recontract intention in the end. In order to examine these hypotheses empirically, we conducted a survey on the 400 franchisors in China. By analyzing the data, we can confirm most hypothesis supposed. Characteristics of franchisor, franchisee, and their relationship influence the performance and the satisfaction of franchisor along with environmental uncertainty. However, in specific, the control of franchisor and the commitment of franchisor do not significantly influence on the performance. Trust, commitment and conflict in their relationship do not affect significantly on the performance and the satisfaction neither. The performance and satisfaction of franchisor positively influence the recontract intention of franchisor. This study thus provide franchisors and practitioners, who plan to extend their franchising business abroad into Chinese market, with some practical knowledge.

Three-Dimensional Periodic Structured Absorber for Broadband Electromagnetic Radiation Absorption

Shuai Xie,Liancheng Zhu,Yuan Zhang,Zhijiang Ji,Jing Wang 대한금속·재료학회 2020 ELECTRONIC MATERIALS LETTERS Vol.16 No.4

This study provides a novel broadband gypsum composite for electromagnetic (EM) radiation protection by the design of 3D circular periodic structure, and using carbon black (CB) as absorbent. The EM absorption performance was investigated by arch reflecting method in 2–18 GHz, and the obtained results indicate that the proposed gypsum absorber exhibits more than 90% absorption of EM radiation in the frequency range of 2–18 GHz. The EM wave absorption can be obviously affected by the variation of CB content, periodic cylinder height and diameter. The optimum CB content is 2 wt%, simultaneously, the absorption peak can be promoted to shift to lower frequency by the increase of periodic cylinder height and the increase of periodic cylinder diameter is beneficial to widen the effective bandwidth. The λ/4 interference of reflected waves, energy dissipation of CB particles, and multi-reflection, resonance, edge diffractions, and impedance matching caused by 3D periodic structural design work synergistically to achieve the high EM absorption efficiency and wide frequency band. It is expected that the proposed 3D circular periodic structured gypsum absorber has great potential in indoor EM radiation prevent.

Multi-switching adaptive synchronization of two fractional-order chaotic systems with different structure and different order

Shuai Song,Xiao-Na Song,Nimisha Pathak,Ines Tejado Balsera 제어·로봇·시스템학회 2017 International Journal of Control, Automation, and Vol.15 No.4

In this work, we combine the active and adaptive control theories, and propose a novel synchronizationscheme for a class of fractional-order chaotic systems with different structure and different order. Based on the newversion of fractional-order Lyapunov stability theory, we design the adaptive controllers and updating laws of differentswitching. We use the fractional-order Lorenz chaotic system and the fractional-order Chen chaotic system asexamples to analyze the multi-switching synchronization process for fractional-order chaotic systems with differentstructures and different orders. Finally, numerical simulations are also given to illustrate the effectiveness and validationof the proposed method, and the model uncertainties and external disturbances are added to the consideredsystems to verify the robustness of the proposed controllers.

Sliding Mode Observer Design for Discrete Nonlinear Time-delay Systems with Stochastic Communication Protocol

Shuai Chen,Jun Guo,Lifeng Ma 제어·로봇·시스템학회 2019 International Journal of Control, Automation, and Vol.17 No.7

In this paper, the network-based sliding mode observer is investigated for a class of discrete nonlineartime-delay systems with stochastic communication protocol. The stochastic communication protocol is adopted toregulate the transmission order of the measurements from multiple sensor nodes, which could effectively avoid datacollisions. Under the scheduling of communication protocol, only one sensor node is allowed to get access to theshared communication network at each time step for data transmission. Moreover, the stochastic communicationprotocol is governed by a Markov chain, which converts the protocol-constrained system into a Markovian jumpsystem. It is the purpose to design a sliding mode observer such that, with the stochastic communication protocol,the trajectories of the estimation error system are driven into a band of the sliding surface and, in subsequent time,the sliding motion is mean-square asymptotically stable. By solving a minimization problem, the sufficient conditions for the desired sliding mode observer are established. Finally, an illustrative example is given to demonstratethe effectiveness of the proposed algorithm.

Model and Heuristics for the Heterogeneous Fixed Fleet Vehicle Routing Problem with Pick-Up and Delivery

Shuai Zhai,Chao Mao 한국유통과학회 2012 유통과학연구 Vol.10 No.12

Purpose – This paper discusses the heterogeneous fixed fleet vehicle routing problem with pick-up and delivery (HFFVRPPD), for vehicles with different capacities, fixed costs, and travel costs. Research Design, data, methodology – This paper made nine assumptions for establishing a mathematical model to describe HFFVRPPD. It established a practical mathematical model, and because of the non-deterministic polynomial-time hard (NP-hard), improved the traditional simulated annealing algorithm and tested a new algorithm using a certain scale model. Result – We calculated the minimum cost of the heterogeneous fixed fleet vehicle routing problem (HFFVRP) with a single task and, on comparing the results with the actual HFFVRP for the single task alone, observed that the total cost of HFFVRPPD reduced significantly by 46.7%. The results showed that the new algorithm provides better solutions and stability. Conclusions – This paper, by comparing the HFFVRP and HFFVRPPD results, highlights certain advantages of using HFFVRPPD in physical distribution enterprises, such as saving distribution vehicles, reducing logistics cost, and raising economic benefits.