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Vehicle roll stability control with active roll-resistant electro-hydraulic suspension

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Frontiers of Mechanical Engineering 2020年第1期15卷 43-54页

作者： Lijun XIAO Ming WANG Bangji ZHANG Zhihua ZHONG State key laboratory of Advanced design and manufacture for Vehicle Body Hunan UniversityChangsha 410082China

This study examines roll stability control for vehicles with an active roll-resistant electro-hydraulic suspension(RREHS)subsystem under steering ***,we derive a vehicle model with four degrees of freedom and incorporates yaw and roll ***,an optimal linear quadratic regulator controller is obtained in consideration of dynamic vehicle ***,an RREHS subsystem with an electric servo-valve actuator is proposed,and the corresponding dynamic equations are ***,field experiments are conducted to validate the performance of the vehicle model under sine-wave and double-lane-change steering ***,the effectiveness of the active RREHS is determined by examining vehicle responses under sine-wave and double-lane-change *** enhancement in vehicle roll stability through the RREHS subsystem is also verified.

关键词： electro-hydraulic suspension roll stability LQR experiment

SiC nanowire-based SU-8 with enhanced mechanical properties for MEMS structural layer design

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nanotechnology and Precision Engineering 2019年第4期2卷 169-176页

作者： Yu Yang Liyan Lai Guifu Ding Ting Chen National key laboratory of Science and Technology on micro/nano Fabrication Shanghai Jiao Tong University

In addition to being used for pattern transfer,the negative photoresist SU-8 iswidely used as a structural material in microelectromechanical systems(MEMS).Due to its good photopatternability,SU-8 has lower manufacturing costs than many other materials,but its mechanical properties are relatively weak to some extent,which limits its *** mechanical properties of epoxy-like SU-8 can be enhanced by addingmicro-or nano-fillers such as carbon nanotube,clay,and SiC nanowire,which have superior elastic *** this study,SiC nanowires were used to improve the mechanical properties of SU-8 while the SU-8 retains its *** SiC nanowires were uniformly dispersed in SU-8 by stirring and ***-8 materials with different SiC nanowire contents were fabricated into dog bone samples by *** elastic modulus,storage modulus,and damping factor of the samples were measured by the Dynamic mechanical analysis(DMA)*** experiment result shows that the rigidity and toughness increased,and the damping *** 2 wt%SiC nanowires-reinforced SU-8 had a 73.88%increase in elastic modulus and a 103.4%increase in elongation at ***,a spring component made by SiC-doped SU-8 could withstand greater *** SiC nanowires-reinforced SU-8 has the potential tomeet higher requirements in the design andmanufacture of MEMS and greatly reduce the manufacturing costs of MEMS devices.

关键词： SU-8 SiC nanowires Elastic modulus Dynamic mechanical analysis(DMA)

Delivering microrobots in the Musculoskeletal System

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nano-micro Letters 2024年第11期16卷 585-617页

作者： Mumin Cao Renwang Sheng Yimin Sun Ying Cao Hao Wang Ming Zhang Yunmeng Pu Yucheng Gao Yuanwei Zhang Panpan Lu Gaojun Teng Qianqian Wang Yunfeng Rui Department of Orthopaedics Zhongda HospitalSchool of MedicineSoutheast UniversityNanjingJiangsuPeople’s Republic of China School of Medicine Southeast UniversityNanjing 210009People’s Republic of China Orthopaedic Trauma Institute(OTI) Southeast UniversityNanjing 210009People’s Republic of China jiangsu key laboratory for design and manufacture of micro‑nano biomedical instruments School of Mechanical EngineeringSoutheast UniversityNanjing 210009People’s Republic of China Center of Interventional Radiology and Vascular Surgery Department of RadiologyZhongda HospitalSchool of MedicineSoutheast UniversityNanjing 210009People’s Republic of China

Disorders of the musculoskeletal system are the major contributors to the global burden of disease and current treatments show limited *** often suffer chronic pain and might eventually have to undergo end-stage ***,future treatments should focus on early detection and intervention of regional *** have been gradually used in organisms due to their advantages of intelligent,precise and minimally invasive targeted *** the combination of control and imaging systems,microrobots with good biosafety can be delivered to the desired area for *** the musculoskeletal system,microrobots are mainly utilized to transport stem cells/drugs or to remove hazardous substances from the *** to traditional biomaterial and tissue engineering strategies,active motion improves the efficiency and penetration of local targeting of cells/*** review discusses the frontier applications of microrobotic systems in different tissues of the musculoskeletal *** summarize the challenges and barriers that hinder clinical translation by evaluating the characteristics of different microrobots and finally point out the future direction of microrobots in the musculoskeletal system.

关键词： microrobot Musculoskeletal system Targeted delivery microrobotic systems Magnetic actuation

Free-standing MXene/chitosan/Cu2O electrode:an enzyme-free and efficient biosensor for simultaneous determination of glucose and cholesterol

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2022年第7期23卷 579-586页

作者： Tao HU Man ZHANG Hui DONG Tong LI Xiao-bei ZANG Xiao LI Zhong-hua NI School of Mechanical Engineering Southeast UniversityNanjing211189China jiangsu key laboratory for design and manufacture of micro-nano biomedical instruments Southeast UniversityNanjing211189China School of Materials Science and Engineering China University of Petroleum(East China)Qingdao266580China

1 Introduction The incidence of"three highs",referring to hy-perglycemia,hypertension,and hyperlipidemia,has been increasing rapidly all over the world(Dey and Raj,2013;Gao et al.,2019).These illnesses may be attributed to the perturbations of blood metabolites which are small molecules within biofluids(Patil et al.,2018).Among them,the presence of cholesterol and glucose in blood at abnormal levels highly increases the risk of cardiac and brain vascular diseases,and diabetes(Li et al.,2019).

关键词： cholesterol diseases

A matching algorithm between precursory 3D process model and 2D working procedure drawing based on subgraph isomorphism

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Science China(Technological Sciences) 2011年第7期54卷 1826-1832页

作者： HUANG Rui ZHANG ShuSheng FAN HaiTao TAO Jun key laboratory of Contemporary design and Integrated manufacture Ministry of Education Northwest Polytechnical University Xi'an 710072 China

To meet the urgent requirement of enterprises for three-dimensional (3D) process models, an approach based on subgraph isomorphism is proposed to solve the matching problem between precursory 3D process model and 2D working procedure drawings. First, the projection drawings of the precursory 3D process model are obtained, then the primitives are extracted and the attributed adjacency graph (AAG) is constructed. Finally, by taking the 2D working procedure drawing as the AAG, and the projection drawing as the whole AAG, the matching problem between precursory 3D process model and 2D working procedure drawings is translated into the problem of subgraph isomorphism. To raise the matching efficiency, the AAG is partitioned, and the vertexes of the graph are classified effectively using the vertex’s attributes. Experimental results show that this method is able to support exact match and the matching efficiency can meet the requirement of practical applications.

关键词： subgraph isomorphism process model three-dimensional model reconstruction working procedure drawing

Direct ink writing of programmable functional silicone-based composites for 4D printing applications

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Interdisciplinary Materials 2022年第4期1卷 507-516页

作者： Zhiyang Lyu J.ustin Koh Gwendolyn J.H.Lim Danwei Zhang Ting Xiong Lei Zhang Siqi Liu Junfei Duan Jun Ding John Wang Jinlan Wang Yunfei Chen Chaobin He jiangsu key laboratory for design and manufacture of micro-nano biomedical instruments School of Mechanical EngineeringSoutheast UniversityNanjingChina Department of Materials Science and Engineering National University of SingaporeSingaporeSingapore Agency for Science Technologyand Research(A*STAR)Institute of Materials Research and EngineeringSingaporeSingapore School of Materials Science and Engineering Changsha University of Science and TechnologyChangshaChina School of Physics Southeast UniversityNanjingChina

Polydimethylsiloxane(PDMS)has been widely used in flexible electronics,soft robotics,and ***,the fabrication of PDMS-based devices has mostly relied on conventional approaches,such as casting and molding,thereby limiting their *** we fabricate PDMS-based composites with programmable microstructures by direct ink writing and realize their practical functionalities of four-dimensional(4D)*** mechanical,thermomechanical and magnetic properties of the three-dimensional-printed composites can be well tailored by using carbon,metal,or ceramic functional *** taking advantage of the printable,flexible,and magnetic PDMS composites,we demonstrate new practical functionalities of 4D printing by designing programmable architectures,including magnetic-field-driven battery cases and patchworks,as well as arbitrary morphing ceramic *** particular,4D-printed batteries are constructed by PDMS-based battery cases for the first time,which can be actuated via external magnetic *** study broadens the paradigm of 4D printing for prospective applications,such as implant batteries,biomimetic engineering,and customized biomedical devices.

关键词： 4D printing 4D-printed batteries direct ink writing PDMS polymer-derived ceramics

A Rubik’s microfluidic cube

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microsystems & nanoengineering 2020年第1期6卷 859-868页

作者： Xiaochen Lai Zhi Shi Zhihua Pu Penghao Zhang Xingguo Zhang Haixia Yu Dachao Li State key laboratory of Precision Measurement Technology and instruments Tianjin UniversityTianjin 300072China Tianjin key laboratory of biomedical Detecting Techniques and instruments Tianjin UniversityTianjin 300072China

A Rubik’s cube as a reconfigurable microfluidic system is presented in this *** of physically interlocking microfluidic blocks,the microfluidic cube enables the on-site design and configuration of custom microfluidics by twisting the faces of the *** reconfiguration of the microfluidics could be done by solving an ordinary Rubik’s cube with the help of Rubik’s cube algorithms and computer *** O-ring-aided strategy is used to enable self-sealing and the automatic alignment of the microfluidic cube *** to the interlocking mechanics of cube blocks,the proposed microfluidic cube exhibits good reconfigurability and robustness in versatile applications and proves to be a promising candidate for the rapid deployment of microfluidic systems in resource-limited settings.

关键词： fluid enable sealing

Deformation simulation of low-temperature high-speed extrusion for 6063 Al alloy

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Journal of Central South University 2010年第5期17卷 881-887页

作者：王孟君何钊武星星李彩文李光耀 key laboratory of Nonferrous Metal Materials Science and Engineering of Ministry of Education Central South University State key laboratory of Advanced design and manufacture for Vehicle Body Hunan University

The hot compression test of 6063 Al alloy was performed on a Gleeble-1500 thermo-simulation machine, and the forming of 6063 rod cxtrudate in low-temperature high-speed extrusion was simulated with extrusion ratio of 25 on the platform of DEFORM 2D successfully. From the compression experimental results, the flow stress model of this Al alloy is obtained which could be the constitutive equation in the simulation of low-temperature high-speed extrusion process. From the numerical simulation results, there is a higher strain concentration at the entrance of the die and the exit temperature reaches up to 522 ℃ in low-temperature high-speed extrusion, which approaches to the quenching temperature of the 6063 Al alloy. The results show that the low-temperature high-speed extrusion method as a promsing one can reduce energy consumption effectively.

关键词： 6063 Al alloy hot deformation low-temperature high-speed extrusion constitutive equation numerical simulation

Development and application of high-end aerospace MEMS

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Frontiers of Mechanical Engineering 2017年第4期12卷 567-573页

作者： Weizheng YUAN key laboratory of micro/nano Systems for Aerospace Ministry ofEducation Xi'an 710072 China key laboratory of micro/nanoElectromechanical Systems Xi'an 710072 China Department ofmicrosystem Engineering Northwestern Polytechnical UniversityXi'an 710072 China

This paper introduces the design and manu- facturing technology of aerospace microelectromechanical systems （MEMS） characterized by high performance, multi-variety, and small batch. Moreover, several kinds of special MEMS devices with high precision, high reliability, and environmental adaptability, as well as their typical applications in the fields of aeronautics and aerospace, are presented.

关键词： MEMS design and manufacture technology,aeronautic and aerospace