Journal of Zhejiang University-SCIENCE A最新文献_第3页

Vibration suppression of composite panel with variable angle tow design and inerter-based nonlinear energy sink 变角拖曳设计和基于干涉的非线性能量汇的复合材料面板振动抑制

IF 3.2 3区工程技术

Journal of Zhejiang University-SCIENCE A Pub Date : 2023-08-01 DOI: 10.1631/jzus.A2200578

Cheng-ti Zhou, Jian Yang, Yingdan Zhu, Chendi Zhu

{"title":"Vibration suppression of composite panel with variable angle tow design and inerter-based nonlinear energy sink","authors":"Cheng-ti Zhou, Jian Yang, Yingdan Zhu, Chendi Zhu","doi":"10.1631/jzus.A2200578","DOIUrl":"https://doi.org/10.1631/jzus.A2200578","url":null,"abstract":"This study investigates the vibration transmission and suppression of a laminated composite panel with variable angle tow (VAT) designs and an attached inerter-based passive nonlinear energy sink. Based on analytical and numerical methodologies, the substructure technique is used to obtain a steady-state dynamic response and the results are verified by experimental and analytical methods. It is demonstrated that fiber orientation has a significant impact on the natural frequencies. The dynamic responses and energy transmission path characteristics are determined and evaluated by forced vibration analysis. The main vibration transmission paths inside the structure are displayed using power flow density vectors. It is demonstrated that the dynamic responses of the plate can be changed considerably by using various fiber placement schemes and passive suppression devices. In addition, it is indicated that the vibration transmission paths are significantly influenced by the tailored fiber angles for improved dynamic performance. Our investigation enhances the understanding of enhanced vibration suppression designs of variable-stiffness composite plates with attached passive devices.","PeriodicalId":17508,"journal":{"name":"Journal of Zhejiang University-SCIENCE A","volume":"41 1","pages":"653 - 672"},"PeriodicalIF":3.2,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87473747","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Research on the sampling performance of a new bionic gravity sampler 一种新型仿生重力采样器的采样性能研究

IF 3.2 3区工程技术

Journal of Zhejiang University-SCIENCE A Pub Date : 2023-08-01 DOI: 10.1631/jzus.A2200442

Y. Ge, Jiamin He, Jin Guo, Peihao Zhang, Hao Wang, Ziqiang Ren, Xiaoling Le, Ying Wang, Yuhong Wang, Jia-wang Chen

引用次数: 0

Effects of potassium channel blockage on inverse stochastic resonance in Hodgkin-Huxley neural systems 钾通道阻塞对霍奇金-赫胥黎神经系统逆随机共振的影响

IF 3.2 3区工程技术

Journal of Zhejiang University-SCIENCE A Pub Date : 2023-08-01 DOI: 10.1631/jzus.A2200625

Xueqing Wang, Dong Yu, Yong Wu, Qianming Ding, Tianyu Li, Ya Jia

{"title":"Effects of potassium channel blockage on inverse stochastic resonance in Hodgkin-Huxley neural systems","authors":"Xueqing Wang, Dong Yu, Yong Wu, Qianming Ding, Tianyu Li, Ya Jia","doi":"10.1631/jzus.A2200625","DOIUrl":"https://doi.org/10.1631/jzus.A2200625","url":null,"abstract":"Inverse stochastic resonance (ISR) is a phenomenon in which the firing activity of a neuron is inhibited at a certain noise level. In this paper, the effects of potassium channel blockage on ISR in single Hodgkin-Huxley neurons and in small-world networks were investigated. For the single neuron, the ion channel noise-induced ISR phenomenon can occur only in a certain small range of potassium channel blockage ratio. Bifurcation analysis showed that this small range is the bistable region regulated by the external bias current. For small-world networks, the effect of non-homogeneous network blockage on ISR was investigated. The network blockage ratio was used to represent the proportion of potassium-channel-blocked neurons to total network neurons. It is found that an increase in network blockage ratio at small coupling strengths results in shorter ISR duration. When the coupling strength is increased, the ISR is more significant in the case of a large network blockage ratio. The ISR phenomenon is determined by the network blockage ratio, the coupling strength, and the ion channel noise. Our results will provide new perspectives on the observation of ISR in neuroscience experiments.","PeriodicalId":17508,"journal":{"name":"Journal of Zhejiang University-SCIENCE A","volume":"306 1","pages":"735 - 748"},"PeriodicalIF":3.2,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77620257","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

压电-电磁混合振动俘能器的实验与理论分析压电-电磁混合振动俘能器的实验与理论分析

IF 3.2 3区工程技术

Journal of Zhejiang University-SCIENCE A Pub Date : 2023-08-01 DOI: 10.1631/jzus.a2200551

Shifan Huang, Weihao Luo, Zongmin Zhu, Zhenlong Xu, Ban Wang, Maoying Zhou, Huawei Qin

引用次数: 0

Numerical study of wheel–rail adhesion performance of new-concept high-speed trains with aerodynamic wings 新概念气动机翼高速列车轮轨黏附性能数值研究

IF 3.2 3区工程技术

Journal of Zhejiang University-SCIENCE A Pub Date : 2023-08-01 DOI: 10.1631/jzus.A2300025

Yang Chen, Lin Jing, Tian Li, Liang Ling, Kaiyun Wang

{"title":"Numerical study of wheel–rail adhesion performance of new-concept high-speed trains with aerodynamic wings","authors":"Yang Chen, Lin Jing, Tian Li, Liang Ling, Kaiyun Wang","doi":"10.1631/jzus.A2300025","DOIUrl":"https://doi.org/10.1631/jzus.A2300025","url":null,"abstract":"Wheel–rail adhesion is a complex tribological problem of wheel–rail rolling contact and is closely related to the operational safety of high-speed trains. A new design concept of high-speed trains was recently proposed with an expectation of a reduction of equivalent weight and total energy consumption by installing aerodynamic wings (aero-wings) on the roof, but it was accompanied by the disadvantage of deteriorating wheel–rail adhesion performance. In this study, a comprehensive multi-body dynamics (MBD) model of the high-speed train with predesigned aero-wings is established using the commercial software SIMPACK, in which the real aerodynamic characteristics of the train are taken into account. The available adhesion and adhesion margin are employed to evaluate the wheel–rail adhesion performance. The influences of aero-wing lift, train speed, and contact conditions on the wheel–rail adhesion level are discussed. The results show that the load transfer caused by the action of aerodynamic load and braking torque was the main reason for the inconsistent adhesion condition of four wheelsets. The influences of aero-wing lift and train speed on the wheel–rail adhesion performance are coupled; the available adhesion of both motor car and trailer is negatively correlated with aero-wing lift and train speed under all contact conditions, while the variation law of adhesion margin with train speed shows differences under different contact conditions. When the wheel–rail interface was polluted by a ‘third-body medium’ such as water and oil, the wheel–rail adhesion performance was dramatically reduced and the wheelset tended to reach adhesion saturation and slide. However, track irregularity had little effect on the adhesion performance and could be ignored to save calculation time. These results are of positive significance for reducing the wheel idling or sliding phenomenon and to ensure the safe operation of high-speed trains with aero-wings.","PeriodicalId":17508,"journal":{"name":"Journal of Zhejiang University-SCIENCE A","volume":"87 1","pages":"673 - 691"},"PeriodicalIF":3.2,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90391767","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Determination of the dynamic characteristics of locomotive drive systems under re-adhesion conditions using wheel slip controller 用轮滑控制器确定再附着条件下机车驱动系统的动态特性

IF 3.2 3区工程技术

Journal of Zhejiang University-SCIENCE A Pub Date : 2023-07-28 DOI: 10.1631/jzus.A2300158

Guosong Wu, Longjiang Shen, Yuan Yao, Wensheng Song, Jing-Fei Huang

{"title":"Determination of the dynamic characteristics of locomotive drive systems under re-adhesion conditions using wheel slip controller","authors":"Guosong Wu, Longjiang Shen, Yuan Yao, Wensheng Song, Jing-Fei Huang","doi":"10.1631/jzus.A2300158","DOIUrl":"https://doi.org/10.1631/jzus.A2300158","url":null,"abstract":"To investigate the re-adhesion and dynamic characteristics of the locomotive drive system with wheel slip controller, a co-simulation model of the train system was established by SIMPACK and MATLAB/SIMULINK. The uniform running and starting conditions were considered, and the influence of structural stiffness of the drive system and the wheel slip controller on the re-adhesion and acceleration performance of the locomotive was investigated. The simulation results demonstrated that the stick-slip vibration is more likely to occur in locomotives with smaller structural stiffnesses during adhesion reduction and recovery processes. There are many frequency components in the vibration acceleration spectrum of the drive system, because the longitudinal and rotational vibrations of the wheelset are coupled by the wheel–rail tangential force when stick-slip vibration occurs. In general, increasing the structural stiffness of the drive system and reducing the input energy in time are effective measures to suppress stick-slip vibration. It should also be noted that inappropriate matching of the wheel slip controller and drive system parameters may lead to electro-mechanical coupling vibration of the drive system, resulting in traction force fluctuation and poor acceleration performance.","PeriodicalId":17508,"journal":{"name":"Journal of Zhejiang University-SCIENCE A","volume":"102 1","pages":"722 - 734"},"PeriodicalIF":3.2,"publicationDate":"2023-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80618682","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Bogie active stability simulation and scale rig test based on frame lateral vibration control 基于车架横向振动控制的转向架主动稳定性仿真及比例试验

IF 3.2 3区工程技术

Journal of Zhejiang University-SCIENCE A Pub Date : 2023-07-01 DOI: 10.1631/jzus.A2200127

Yadong Song, Hu Li, Jun Cheng, Yuan Yao

引用次数: 0

Underwater minirobots actuated by hybrid driving method 混合驱动水下微型机器人

IF 3.2 3区工程技术

Journal of Zhejiang University-SCIENCE A Pub Date : 2023-07-01 DOI: 10.1631/jzus.A2300056

Xinghong Ye, Yang Yang, Pengcheng Jiao, Zhiguo He, Lingwei Li

{"title":"Underwater minirobots actuated by hybrid driving method","authors":"Xinghong Ye, Yang Yang, Pengcheng Jiao, Zhiguo He, Lingwei Li","doi":"10.1631/jzus.A2300056","DOIUrl":"https://doi.org/10.1631/jzus.A2300056","url":null,"abstract":"Underwater minirobots have attracted significant interest due to their value in complex application scenarios. Typical underwater minirobots are driven mainly by a soft or rigid actuator. However, soft actuation is currently facing challenges, including inadequate motional control accuracy and the lack of a continuous and steady driving force, while conventional rigid actuation has limited actuation efficiency, environmental adaptability, and motional flexibility, which severely limits the accomplishment of complicated underwater tasks. In this study, we developed underwater minirobots actuated by a hybrid driving method (HDM) that combines combustion-based actuators and propeller thrusters to achieve accurate, fast, and flexible underwater locomotion performance. Underwater experiments were conducted to investigate the kinematic performance of the minirobots with respect to the motion modes of rising, drifting, and hovering. Numerical models were used to investigate the kinematic characteristics of the minirobots, and theoretical models developed to unveil the mechanical principle that governs the driving process. Satisfactory agreement was obtained from comarisons of the experimental, numerical, and theoretical results. Finally, the HDM was compared with selected hybrid driving technologies in terms of acceleration and response time. The comparison showed that the minirobots based on HDM were generally superior in transient actuation ability and reliability.","PeriodicalId":17508,"journal":{"name":"Journal of Zhejiang University-SCIENCE A","volume":"300 1","pages":"596 - 611"},"PeriodicalIF":3.2,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75112357","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Square cavity flow driven by two mutually facing sliding walls 由两个相互面向的滑动壁面驱动的方形空腔流动

IF 3.2 3区工程技术

Journal of Zhejiang University-SCIENCE A Pub Date : 2023-07-01 DOI: 10.1631/jzus.A2200447

Bo An, J. M. Bergadà, W. Sang, Dong Li, F. Mellibovsky

{"title":"Square cavity flow driven by two mutually facing sliding walls","authors":"Bo An, J. M. Bergadà, W. Sang, Dong Li, F. Mellibovsky","doi":"10.1631/jzus.A2200447","DOIUrl":"https://doi.org/10.1631/jzus.A2200447","url":null,"abstract":"We investigate the flow inside a 2D square cavity driven by the motion of two mutually facing walls independently sliding at different speeds. The exploration, which employs the lattice Boltzmann method (LBM), extends on previous studies that had the two lids moving with the exact same speed in opposite directions. Unlike there, here the flow is governed by two Reynolds numbers (ReT, ReB) associated to the velocities of the two moving walls. For convenience, we define a bulk Reynolds number Re and quantify the driving velocity asymmetry by a parameter α. Parameter α has been defined in the range α∈[−π/4, 0] and a systematic sweep in Reynolds numbers has been undertaken to unfold the transitional dynamics path of the two-sided wall-driven cavity flow. In particular, the critical Reynolds numbers for Hopf and Neimark-Sacker bifurcations have been determined as a function of α. The eventual advent of chaotic dynamics and the symmetry properties of the intervening solutions are also analyzed and discussed. The study unfolds for the first time the full bifurcation scenario as a function of the two Reynolds numbers, and reveals the different flow topologies found along the transitional path.","PeriodicalId":17508,"journal":{"name":"Journal of Zhejiang University-SCIENCE A","volume":"50 1","pages":"612 - 624"},"PeriodicalIF":3.2,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86490195","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Numerical investigation of the effect of geosynthetic clay liner chemical incompatibility on flow and contaminant transport through a defective composite liner 土工合成粘土衬里化学不相容性对有缺陷复合衬里流动和污染物运移影响的数值研究

IF 3.2 3区工程技术

Journal of Zhejiang University-SCIENCE A Pub Date : 2023-07-01 DOI: 10.1631/jzus.A2200416

Shiyuan Yao, Yuchao Li, Shan Tong, G. Chen, Yunmin Chen

{"title":"Numerical investigation of the effect of geosynthetic clay liner chemical incompatibility on flow and contaminant transport through a defective composite liner","authors":"Shiyuan Yao, Yuchao Li, Shan Tong, G. Chen, Yunmin Chen","doi":"10.1631/jzus.A2200416","DOIUrl":"https://doi.org/10.1631/jzus.A2200416","url":null,"abstract":"A composite liner consisting of a geomembrane (GMB) and a geosynthetic clay liner (GCL) can be compromised by inorganic contaminants because of a defective GMB. When the composite liner with defective GMB is exposed to aggressive leachate conditions, the neglect of the chemical incompatibility of the GCL can potentially result in an underestimation of the leakage rate and flux through the composite liner. This paper proposed a numerical investigation on the effect of chemical incompatibility of GCL on the barrier performance of the composite liner with hole defect. Four cases with leachate solutions having varied cation valencies and ionic strengths were analyzed, in which the hydraulic conductivity of GCL was concentration-dependent. Both the effect of the chemical incompatibility of GCL and the mechanisms were analyzed. The incompatibility of GCL resulted in significant increases in leakage rate and flux through the composite liner by factors of up to 4.9 and 5.0, respectively. The incompatibility-affected area in GCL is located within 0.1 m from the center of the hole in the GMB. The coupled increase in the hydraulic conductivity of GCL and pore water concentration impacts the flux and leakage in a short period of time. With GCL chemical incompatibility considered, advection may dominate the contaminant transport through GCL.","PeriodicalId":17508,"journal":{"name":"Journal of Zhejiang University-SCIENCE A","volume":"13 1","pages":"557 - 568"},"PeriodicalIF":3.2,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79313794","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0