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Design considerations and experimental studies on semi-active smart pin joint

Yancheng LI, Jianchun LI, Bijan SAMALI, Jiong WANG,

Frontiers of Mechanical Engineering 2009, Volume 4, Issue 4,   Pages 363-370 doi: 10.1007/s11465-009-0074-1

Abstract: An intelligent structural system equipped with smart structural members that are controllable in real-timeIn this paper, design and testing of a semi-active magnetorheological (MR) pin joint, in which the momentby altering the magnetic field, is reported with the view of using it as a potential candidate for smartDesign of prototype smart pin joints includes theoretical analysis related to the radius of the rotaryIt is found, from the theoretical analysis and experimental verification, that the MR pin joint with

Keywords： magnetorheological (MR) fluids     smart pin joint     design consideration    

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Dynamic characteristics of a magnetorheological pin joint for civil structures

Yancheng LI,Jianchun LI

Frontiers of Mechanical Engineering 2014, Volume 9, Issue 1,   Pages 15-33 doi: 10.1007/s11465-014-0283-0

Abstract:

Magnetorheological (MR) pin joint is a novel device in which its joint moment resistance can be controlledThe smart pin joint is intended to be used as a controllable connector between the columns and beamsstructure, the main purpose of this paper is to test and characterise the hysteretic behaviour of MR pinjoint.A test scheme is designed to obtain the dynamic performance of MR pin joint in the dominant earthquake

Keywords： Magnetorheological pin joint     hyperbolic hysteresis model experimental testing frequency dependence    

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Space-frequency Joint Blind Multi-user Detection Algorithm in Smart Antenna MC-CDMA System

Fu Hongliang,Feng Guangzeng

Strategic Study of CAE 2006, Volume 8, Issue 2,   Pages 34-38

Abstract:

A space-frequency joint blind multi-user adaptive detection algorithm in smart antenna MC-CDMA system

Keywords： smart antenna     multi-carrier     CDMA     joint detection    

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multi-objective design method for seismic retrofitting of existing reinforced concrete frames using pin-supported

Yue CHEN; Rong XU; Hao WU; Tao SHENG

Frontiers of Structural and Civil Engineering 2022, Volume 16, Issue 9,   Pages 1089-1103 doi: 10.1007/s11709-022-0851-z

Abstract: Among them, pin-supported rocking walls (PWs) have received much attentions to researchers recently.

Keywords： pin-supported rocking wall     reinforced concrete frame     seismic retrofit     stiffness demand     drift concentration    

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Analytical algorithms of compressive bending capacity of bolted circumferential joint in metro shield

Frontiers of Structural and Civil Engineering   Pages 901-914 doi: 10.1007/s11709-023-0915-8

Abstract: This study focuses on the mechanical characteristics and mechanism of a bolted circumferential jointanalytical algorithms for four stress stages are established to describe the bearing behaviors of the jointstudy is performed to verify the rationality of the simplified theoretical analysis for the segment jointinvestigation is conducted to discuss the factors affecting the ultimate compressive bending capacity of the jointThe method for optimizing the joint flexural stiffness is clarified.

Keywords： shield tunnel     segment joint     joint structural model     failure mechanism    

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Antibiotics-mediated intestinal microbiome perturbation aggravates tacrolimus-induced glucose disorders in mice

Yuqiu Han, Xiangyang Jiang, Qi Ling, Li Wu, Pin Wu, Ruiqi Tang, Xiaowei Xu, Meifang Yang, Lijiang Zhang

Frontiers of Medicine 2019, Volume 13, Issue 4,   Pages 471-481 doi: 10.1007/s11684-019-0686-8

Abstract: Both immunosuppressants and antibiotics (ABX) are indispensable for transplant patients. However, the former increases the risk of new-onset diabetes, whereas the latter impacts intestinal microbiota (IM). It is still unclear whether and how the interaction between immunosuppressants and ABX alters the IM and thus leads to glucose metabolism disorders. This study examined the alterations of glucose and lipid metabolism and IM in mice exposed to tacrolimus (TAC) with or without ABX. We found that ABX further aggravated TAC-induced glucose tolerance and increased insulin secretion. Combined treatment resulted in exacerbated lipid accumulation in the liver. TAC-altered microbial community was further amplified by ABX administration, as characterized by reductions in phylum Firmicutes, family Lachnospiraceae, and genus . Analyses based on the metagenomic profiles revealed that ABX augmented the effect of TAC on microbial metabolic function mostly related to lipid metabolism. The altered components of gut microbiome and predicted microbial functional profiles showed significant correlation with hepatic lipid accumulation and glucose disorders. In conclusion, ABX aggravated the effect of TAC on the microbiome and its metabolic capacities, which might contribute to hepatic lipid accumulation and glucose disorders. These findings suggest that the ABX-altered microbiome can amplify the diabetogenic effect of TAC and could be a novel therapeutic target for patients.

Keywords： antibiotics     tacrolimus     glucose disorders     microbiome    

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Finite element analysis on the seismic behavior of side joint of Prefabricated Cage System in prefabricated

Yunlin LIU, Shitao ZHU

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 5,   Pages 1095-1104 doi: 10.1007/s11709-019-0538-2

Abstract: Side joint is the weak region of PCS concrete frame and has great influence on seismic behavior of theThus systematically study on the seismic behavior of PCS concrete side joint is necessary.This paper presents a finite element study on behavior of the side joint under seismic loading.

Keywords： PCS concrete side joint     numerical simulation     fiber-beam element joint model     solid element joint model    

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Association of the genetic polymorphism of EPHX1 and EPHX2 with the susceptibility to chronic benzene poisoning

SUN Pin, ZHANG Zhongbin, WU Fen, WAN Junxiang, JIN Xibeng, XIA Zhaolin

Frontiers of Medicine 2007, Volume 1, Issue 3,   Pages 320-326 doi: 10.1007/s11684-007-0062-y

Abstract: The aim of this study was to explore the association of the genetic polymorphism of and with the susceptibility to chronic benzene poisoning (CBP). A case-control study of 268 patients with CBP and 268 healthy workers matched by age and sex, all of whom were occupationally exposed to benzene, was conducted. The single nucleotide polymorphisms (SNPs, rs2854451, rs3738047, rs2234922 and rs1051741) of gene and the SNP (rs751141) of gene were tested by the TaqMan PCR method. In the subjects carrying the genotype of rs3738047 GG, the risk of CBP was decreased in the individuals simultaneously carrying rs2234922 G ( = 0.02). Alternatively, in the subjects carrying the genotype of rs2234922 AA, the risk of CBP was increased in the individuals simultaneously carrying the allele of rs751141A ( = 0.03). It was also found that there were potential interactions between alcohol consumption and the polymorphism of rs1051741 ( = 5.28, = 0.02) or rs2234922 (= 6.71, = 0.01). Compared to individuals with rs1051741 CC or rs2234922 AA genotype in the drinkers, the risk of CBP in those carrying genotypes of rs1051741 CT+TT or rs2234922 AG+GG was decreased, respectively ( = 0.04, 〈0.01). Haplotype analysis of polymorphisms in showed that the risk of CBP was increased in the subjects with haplotype 2 (rs2854451-A, rs3738047-G, rs2234922-A, rs1051741-C) or haplotype 4 (rs2854451-G, rs3738047-A, rs2234922-G, rs1051741-T), but decreased in those with haplotype 6 (rs2854451-G, rs3738047-G, rs2234922-G, rs1051741-T) or haplotype 10 (rs2854451-A, rs3738047-A, rs2234922-G, rs1051741-T), respectively. Logistic regression analysis revealed that smoking might play a role in modifying the risk of CBP (OR = 0.313, 95% CI: 0.123 0.794, = 0.015). The genetic polymorphism in may be associated with the risk of CBP in the Chinese occupational population and further research is needed for the association between the genetic polymorphism in and the susceptibility to CBP.

Keywords： case-control     rs2854451     regression analysis     haplotype     further research    

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Modal analysis of acoustic leak signal in pipelines using time-frequency analysis

JIAO Jing-pin, FEI Ren-yuan, HE Cun-fu, WU Bin

Frontiers of Mechanical Engineering 2006, Volume 1, Issue 2,   Pages 146-150 doi: 10.1007/s11465-006-0013-3

Abstract: It is important to analyze the propagation characteristics of guided waves in acoustic leak location in pipelines. In this paper, the acoustic leak signal is analyzed in the time-frequency domain. Based on the relation of time-frequency distribution of the acoustic leak signal and the dispersion curves of guided waves, the mode components of acoustic leak signals were obtained. The research can provide a guideline for the mode selection in pipeline leak location, and help improve the accuracy of leak location.

Keywords： dispersion     selection     guided     research     time-frequency    

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Prediction of shield tunneling-induced ground settlement using machine learning techniques

Renpeng CHEN, Pin ZHANG, Huaina WU, Zhiteng WANG, Zhiquan ZHONG

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 6,   Pages 1363-1378 doi: 10.1007/s11709-019-0561-3

Abstract: Predicting the tunneling-induced maximum ground surface settlement is a complex problem since the settlement depends on plenty of intrinsic and extrinsic factors. This study investigates the efficiency and feasibility of six machine learning (ML) algorithms, namely, back-propagation neural network, wavelet neural network, general regression neural network (GRNN), extreme learning machine, support vector machine and random forest (RF), to predict tunneling-induced settlement. Field data sets including geological conditions, shield operational parameters, and tunnel geometry collected from four sections of tunnel with a total of 3.93 km are used to build models. Three indicators, mean absolute error, root mean absolute error, and coefficient of determination the ( ) are used to demonstrate the performance of each computational model. The results indicated that ML algorithms have great potential to predict tunneling-induced settlement, compared with the traditional multivariate linear regression method. GRNN and RF algorithms show the best performance among six ML algorithms, which accurately recognize the evolution of tunneling-induced settlement. The correlation between the input variables and settlement is also investigated by Pearson correlation coefficient.

Keywords： EPB shield     shield tunneling     settlement prediction     machine learning    

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A new acoustic emission source location technique based on wavelet transform and mode analysis

JIAO Jing-pin, HE Cun-fu, WU Bin, FEI Ren-yuan, WANG Xiu-yan

Frontiers of Mechanical Engineering 2006, Volume 1, Issue 3,   Pages 341-345 doi: 10.1007/s11465-006-0006-4

Abstract: For wave propagation in dispersive media, the arrival time of the acoustic emission signal to the sensor is dependent on the setting of the threshold voltage, which results in the inaccuracy of the acoustic emission location. Based on the wavelet transform and the theory of modal acoustic emission, a new method is proposed to improve the accuracy of acoustic emission source location. It is believed that the acoustic emission signal propagation in the structure has the characteristics of multi-mode and dispersion, and the acoustic emission source location should use the arrival time to sensors obtained from the output signals not only at the same mode but also at the same frequency. The wavelet transform is used to resolve the problem. By utilizing the time-frequency data of the wavelet, the frequency-dependent arrival time traveling is easily obtained; by numerical computation of the wave s propagation in structure, the group velocity of the guided mode is also obtained, therefore the accuracy source location is realized. The acoustic emission source location experiments were conducted in a thin steel plate and results show that the technique is an effective tool for acoustic emission source location.

Keywords： s propagation     frequency     emission signal     signal propagation     dispersive    

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Human hip joint center analysis for biomechanical design of a hip joint exoskeleton Article

Wei YANG,Can-jun YANG,Ting XU

Frontiers of Information Technology & Electronic Engineering 2016, Volume 17, Issue 8,   Pages 792-802 doi: 10.1631/FITEE.1500286

Abstract: The motions of the hip joint center with variation of the flexion angle were measured and the resultingThe humanexoskeleton model was analyzed to further validate the decrease of the hip joint internal forceduring hip joint flexion or abduction by applying the resulting design.

Keywords： Hip joint exoskeleton     Hip joint center     Compatible joint     Human-machine interaction force    

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Identification of dynamic stiffness matrix of bearing joint region

Feng HU, Bo WU, Youmin HU, Tielin SHI

Frontiers of Mechanical Engineering 2009, Volume 4, Issue 3,   Pages 289-299 doi: 10.1007/s11465-009-0064-3

Abstract: The paper proposes an identification method of the dynamic stiffness matrix of a bearing joint regionThe dynamic stiffness matrix of the bearing joint region can be identified by measuring the matrix ofresults, and there is very high reliability in the identified dynamic stiffness matrix of the bearing joint

Keywords： frequency response function (FRFs)     dynamic stiffness     finite element     synthetic substructure method     joint    

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Joint slip investigation based on finite element modelling verified by experimental results on wind turbine

Saleh YAGHOOBI, Ahmad SHOOSHTARI

Frontiers of Structural and Civil Engineering 2018, Volume 12, Issue 3,   Pages 341-351 doi: 10.1007/s11709-017-0393-y

Abstract:

Slippage corresponds to the relative displacement of a bolted joint subjected to shear loads sincethe construction clearance between the bolt shank and the bolthole at assembly can cause joint slip.Deflections of towers with joint slippage effects is up to 1.9 times greater than the displacements obtainedFinally, joint slip data for different types of angles, bolt diameter and bolt arrangements are generated

Keywords： Joint slip     cyclic loading     Finite element modelling     Experimental joint behavior     damping ratios (   

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General closed-form inverse kinematics for arbitrary three-joint subproblems based on the product of

Frontiers of Mechanical Engineering 2022, Volume 17, Issue 2, doi: 10.1007/s11465-022-0681-7

Abstract: solve all the inverse kinematics problems, and there is no common approach to solve arbitrary three-jointgeometric (NAG) methods that obtain the general closed-form inverse kinematics for all types of three-jointalgebraic constraints are used as the conditions precedent to solve the inverse kinematics of three-jointindicating that the inverse solutions are consistent with the given joint angles validate the generalThe simulation result shows the inverse solutions and six sets given joint angles are consistent.

Keywords： inverse kinematics     Paden–Kahan subproblems     three-joint subproblems     product of exponential     closed-form    

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Title Author Date Type Operation

Design considerations and experimental studies on semi-active smart pin joint

Yancheng LI, Jianchun LI, Bijan SAMALI, Jiong WANG,

Journal Article

Dynamic characteristics of a magnetorheological pin joint for civil structures

Yancheng LI,Jianchun LI

Journal Article

Space-frequency Joint Blind Multi-user Detection Algorithm in Smart Antenna MC-CDMA System

Fu Hongliang,Feng Guangzeng

Journal Article

multi-objective design method for seismic retrofitting of existing reinforced concrete frames using pin-supported

Yue CHEN; Rong XU; Hao WU; Tao SHENG

Journal Article

Analytical algorithms of compressive bending capacity of bolted circumferential joint in metro shield

Journal Article

Antibiotics-mediated intestinal microbiome perturbation aggravates tacrolimus-induced glucose disorders in mice

Yuqiu Han, Xiangyang Jiang, Qi Ling, Li Wu, Pin Wu, Ruiqi Tang, Xiaowei Xu, Meifang Yang, Lijiang Zhang

Journal Article

Finite element analysis on the seismic behavior of side joint of Prefabricated Cage System in prefabricated

Yunlin LIU, Shitao ZHU

Journal Article

Association of the genetic polymorphism of EPHX1 and EPHX2 with the susceptibility to chronic benzene poisoning

SUN Pin, ZHANG Zhongbin, WU Fen, WAN Junxiang, JIN Xibeng, XIA Zhaolin

Journal Article

Modal analysis of acoustic leak signal in pipelines using time-frequency analysis

JIAO Jing-pin, FEI Ren-yuan, HE Cun-fu, WU Bin

Journal Article

Prediction of shield tunneling-induced ground settlement using machine learning techniques

Renpeng CHEN, Pin ZHANG, Huaina WU, Zhiteng WANG, Zhiquan ZHONG

Journal Article

A new acoustic emission source location technique based on wavelet transform and mode analysis

JIAO Jing-pin, HE Cun-fu, WU Bin, FEI Ren-yuan, WANG Xiu-yan

Journal Article

Human hip joint center analysis for biomechanical design of a hip joint exoskeleton

Wei YANG,Can-jun YANG,Ting XU

Journal Article

Identification of dynamic stiffness matrix of bearing joint region

Feng HU, Bo WU, Youmin HU, Tielin SHI

Journal Article

Joint slip investigation based on finite element modelling verified by experimental results on wind turbine

Saleh YAGHOOBI, Ahmad SHOOSHTARI

Journal Article

General closed-form inverse kinematics for arbitrary three-joint subproblems based on the product of

Journal Article