Shizhen Li

Southern University of Science and Technology

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Yanjun Liu

Shandong University

Jingzhi Zhang

Shandong University

Wenzhuo Shi

Shandong University of Science and Technology

Jianhua Wei

Children's Hospital of Chongqing Medical University

Jinhui Fang

Zhejiang University

Danyao Zhao

Shandong University

Zimeng Guo

Shandong University

Xiaoyu Zhai

Shandong University

Xu Yang

Tianjin University

Weimin Liu

Northwestern Polytechnical University

Cooperative Institutions

Chinese Academy of Sciences

Shandong University

Shandong University of Science and Technology

Zhejiang University

Qingdao Institute of Bioenergy and Bioprocess Technology

Central South University

University of Chinese Academy of Sciences

Qingdao University of Science and Technology

Beihang University

Tsinghua University

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The balance of flexible two-wheeled robot

Xiaogang Ruan Shizhen Li Xinyuan Li Xuyang Hou

The flexible two-wheeled balancing robot is a non-stable, non-linear, strong coupling system.A Kalman filter configuration combining a gyroscope and an inclinometer is implement to obtain an accurate estimate of the tilt angle and its derivate.This paper also presents nonlinear PID controller for the posture balancing control of FTWSBR, The experiment results demonstrate that the control method is effective for FTWSBR.

Inclinometer

10.1109/csss.2011.5974372

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Optimum Design of the Hydraulic System with Supercharger in Argo Based on AMESim

Fengxiang Guo Yanjun Liu Gang Xue Zhitong Li Shizhen Li

For the issues of plunger pump of the hydraulic system happening in practical application of Argo like poor self-priming, a system with a supercharger and a low-pressure gear pump is built to improve the stability of floating and slash costs. Using HCD (hydraulic component design) of AMESim to construct supercharger and simulation model of the whole system, the static and dynamic characteristics are analyzed. The results show that the system performance can satisfy the design requirements. But the working pressure would affect the system efficiency. Further, the parameter optimization of supercharger is necessary to improve the efficiency.

10.1109/usys.2018.8779042

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A Method for Rack Area Zoning Based on Task Cycle Time in Automated Storage/Retrieval System

Shizhen Li Di He Qiyuan Peng

The average task cycle time formulation for storage/ retrieval machine are presented considering various travel speeds with known acceleration and deceleration rates. Consider the speed profiles in real-world applications, simulation experiments with discrete storage locations are constructed to find the relationship of average single-command cycle time and length and height of rack. Rack area is divided into several storage zones and could be useful tools for realizing economical design and efficient management for automated storage/ retrieval system (AS/RS) in real-world applications.

10.1061/40932(246)158

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Compound control for power quality in grid-connected wave energy system

Ting Li Danyao Zhao Yulong Zhang Shizhen Li

Combined with the rapid volatility and spatial distribution characteristics of wave energy, the output power of wave energy devices is relatively unstable. When the wave energy device group is connected to the grid, the power grid after the power generation device is converged may still experience a voltage dip, which will affect the power quality and system stability of the load grid. This paper is based on the modular multilevel converter (MMC) to develop the wave energy device group flexible direct current transmission (MMC-HVDC) system. Combining the internal topological structure of the system and the MMC mathematical model, the system compound control strategy under the island operation mode is proposed. The control system operates in a synchronous reference frame (SRF). In addition to the basic controller, it also includes a circulating current suppression controller (CCSC) and a zero sequence current suppression controller. A MATLAB/Simulink simulation model is established based on the actual project. The simulation results show that the system can effectively compensate for transient voltage sags. In addition, the system also has power quality adjustment capabilities such as low harmonic distortion, reactive power compensation and circulating current suppression.

Transmission system

10.1109/icedme52809.2021.00028

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Numerical research on hydrodynamic characteristics of fish-like flexible oscillating hydrofoil

Zhitong Li Gang Xue Yanjun Liu Fengxiang Guo Shizhen Li

Hydrofoil is a common structure of underwater machinery and has good hydrodynamic performance. At present, most of the studies on oscillating hydrofoils are on rigid hydrofoils, but few on hydrodynamics of flexible oscillating hydrofoils. In this paper, the kinetic model of flexible hydrofoil is established by imitating tuna swimming. Then the relationship between the hydrodynamic coefficients and the flexibility of hydrofoil was analyzed. At last, the effects of the pressure distribution and the vortex distribution on the thrust of the flexible hydrofoil were analyzed. The research will do favor in the fish-like propulsor design.

Propulsor

Propulsive efficiency

10.1109/usys.2018.8778872

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Graphene‐Encapsulated Copper tin Sulfide Submicron Spheres as High‐Capacity Binder‐Free Anode for Lithium‐Ion Batteries

ChemElectroChem (2017)

Lin Fu Xiaogang Wang Jun Ma Chuanjian Zhang Jianjiang He

Abstract Sn‐based sulfides are potential anode materials for lithium‐ion batteries (LIBs); nevertheless, they typically suffer from poor cycle stability resulted from the huge volume variation during lithium‐ion insertion and extraction. Herein, we successfully fabricated the multiphase Cu 2 Sn 3 S 7 /Cu 2 SnS 3 /SnS 2 (CTS) submicron spheres uniformly incorporated with reduced graphene oxide nanosheets (CTS@RGO). This binder‐free hybrid CTS@RGO paper exhibits favorable capacity retention as an anode of LIBs (965 mAh g −1 after 300 cycles at current density of 500 mA g −1 ), as well as better rate capability and high initial coulombic efficiency compared with that of a pristine CTS anode. The enhanced electrochemical performance can be ascribed to the introduction of graphene as a buffer to accommodate large volume changes and to maintain structural integrity of electrode.

Tin oxide

10.1002/celc.201700100

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Citations (30)

Low-crystalline transition metal oxide/hydroxide on MWCNT by Fenton-reaction-inspired green synthesis for lithium ion battery and OER electrocatalysis

Electrochimica Acta (2021)

Xiaojuan Liu Shizhen Li Bamidele Akinwolemiwa Di Hu Tao Wu

10.1016/j.electacta.2021.138559

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Research on Three-Closed-Loop ADRC Position Compensation Strategy Based on Winch-Type Heave Compensation System with a Secondary Component

Journal of Marine Science and Engineering (2024)

Shizhen Li Qinfeng Wu Yufeng Liu Longfei Qiao Zimeng Guo

To mitigate the interference of waves on an offshore operation ship, heave compensation systems find widespread application. The performance of heave compensation systems significantly influences the efficiency and safety of maritime operations. This study established a mathematical model for a winch-based active heave compensation system. It introduced a three-loop active disturbance rejection control (ADRC) strategy that encompasses piston position control, winch speed control, and load-displacement control to enable the real-time estimation and compensation of system disturbances, thereby enhancing the performance of the heave compensation system. To assess the effectiveness of this control strategy, this study employed Matlab/Simulink and AMESim to construct a co-simulation model and conducted a comparative analysis with traditional proportional integral derivative (PID) control systems. The research findings indicate that the three-loop ADRC position control strategy consistently delivered superior compensation performance across various operational scenarios.

Winch

Component (thermodynamics)

Position (finance)

10.3390/jmse12020346

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Investigations on Linear Manoeuvres of Underwater Towed Cable in Current

Journal of Physics Conference Series (2020)

Liangkui Gong Wenkai Wang Shizhen Li Yanjun Liu Hui Yu

Abstract In this paper, a numerical method for dynamic characteristics of cable in marine linear towage is proposed. The governing equation of the towing system is established based on the lumped mass method. The continuous dynamic characteristic partial differential equation is obtained by the discretization of cascade nodes. The equation is solved by the finite difference time domain method. Through numerical simulation, the tension variation curves and cable response configuration under three different operating conditions-when there is no current, along with and against sea current directions-are given respectively, which can be used for dynamic load estimation and motion trajectory prediction in towed-array systems. The comparison between the numerical example results and the experimental demonstrates the validity of the method and is of practical significance for improving maritime safety and operational efficiency.

Towing

Tension (geology)

10.1088/1742-6596/1549/4/042078

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Prediction, Control and Energy Analyses of Hydraulic Transformer Based Heave Compensator

Huan Yu Jinhui Fang Jianhua Wei Shizhen Li Hangjun Zhang

Abstract Heave compensators are widely used in offshore equipments to decouple the load motion from the wave induced ship motion. Hydraulic transformer based heave compensator (HTHC) can better compensate the ship’s heave in comparison with passive heave compensators (PHC) under changing sea conditions, meanwhile the accumulators’ volume is decreased significantly. Here in this paper, some further discussions about HTHC are given on the aspects of prediction, controller design and energy saving through simulation. Results turn out that heave prediction based on sliding mode observer is better than the Luenberger observer based one; chattering can be reduced through back-stepping method. The controller is robust when the load is perturbed by uncertain forces, and energy consumption of HTHC is about 56% of the one in an equal-sized hybrid active heave compensator (HAHC) meanwhile its total installed power can be reduced by 70%.

10.1115/fpmc2021-69399

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