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Influence of ambient temperature on the CO_(2)emitted of light-duty vehicle

Journal of Environmental Sciences 2024年第6期140卷 59-68页

作者： Dan Tan Yachao Wang Jianwei Tan Jiachen Li Changyu Wang Yunshan Ge School of Mechanical Engineering Beijing Institute of TechnologyBeijing 100081China

Because of global warming,people have paid more attention to greenhouse gas emitted by *** quantify the impact of temperature on vehicle CO_(2)emissions,this study was conducted using the world light vehicle test cycle on two light-duty E10 gasoline vehicles a ambient temperatures of-10,0,23,and 40℃,and found that CO_(2)emission factors of Vehicle1 in the low-speed phase were 22.07%and 20.22%higher than those of Vehicle 2 at cold star and hot start under-10℃.The reason was vehicle 1 had a larger displacement and more friction pairs than vehicle *** was the highest CO_(2)emission at the low-speed phase due to low average speed,frequent acceleration,and *** CO_(2)temperature factor and the ambient temperature had a strong linear correlation(R2=0.99).According to CO_(2)temperature factors and their relationships,CO_(2)emission factors of other ambien temperatures could be calculated when the CO_(2)emission factor of 23℃was obtained,and the method also could be used to obtain the CO_(2)temperature factors of different *** separate the effect of load setting and temperature variation on CO_(2)emission quantitatively a method was *** results showed that the load setting was dominant for the CO_(2)emission *** with 23℃,the CO_(2)emission for vehicle 1 caused by load setting variation were 62.83 and 47.42 g/km,respectively at-10 and 0℃,while those fo vehicle 2 were 45.01 and 35.63 g/km,respectively.

关键词： CO_(2)emission Ambient temperature E10 gasoline Light-duty vehicle WLTC

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Output feedback active disturbance rejection control of an electro-hydraulic servo system based on command filter

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Chinese Journal of Aeronautics 2025年第2期38卷 214-225页

作者： Yanchun BAI Jianyong YAO Jian HU Guangbin FENG School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing 210094China

The output feedback active disturbance rejection control of a valve-controlled cylinder electro-hydraulic servo system is investigated in this ***,a comprehensive nonlinear mathematical model that encompasses both matched and mismatched disturbances is *** to the fact that only position information can be measured,a linear Extended State Observer(ESO)is introduced to estimate unknown states and matched disturbances,while a dedicated disturbance observer is constructed to estimate mismatched *** from the traditional observer results,the design of the disturbance observer used in this study is carried out under the constraint of output ***,an output feedback nonlinear controller is proposed leveraging the aforementioned observers to achieve accurate trajectory *** mitigate the inherent differential explosion problem of the traditional backstepping framework,a finite-time stable command filter is ***,considering transient filtering errors,a set of error compensation signals are designed to counter their negative impact *** analysis affirms that the proposed control strategy ensures the boundedness of all signals within the closed-loop ***,under the specific condition of only time-invariant disturbances in the system,the conclusion of asymptotic stability is ***,the algorithm’s efficacy is validated through comparative experiments.

关键词： Active disturbance rejection control Extended state observer Output feedback Disturbance observer Command filter

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Exploring the material and mechanical characteristics of 3D printed composites utilizing nSiO2-particulate-reinforced PLA/HDPE filaments with potential applications in the medical field (DEC, 10.1080/1023666X.2024.2444320, 2024)

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INTERNATIONAL JOURNAL OF POLYMER ANALYSIS AND CHARACTERIZATION 2025年第2期30卷 0I-0I页

作者： Vallavi, M. S. Aezhisai Mugilan, T. Sridhar, N. Department of Mechanical Engineering Government College of Technology Tamil Nadu Coimbatore India Department of Mechanical Engineering Indian Institute of Technology - Madras Tamil Nadu Chennai India

Significant progress in 3D printing technology over recent decades has allowed for the creation of biomedical products with enhanced properties. The incorporation of composite materials in 3D printing offers innovative solutions to a wide range of real-world challenges in medical applications. The present research focuses on the additively manufactured 3D-printed polymer composites developed through the fused deposition modeling technique. mechanical characteristics such as tensile, compressive, flexural, and Shore D hardness have been investigated in pure PLA/HDPE and with different 1, 2, 3 wt.% of functionalized nSiO 2 reinforced PLA/HDPE. Their results showed that excellent mechanical strength was observed in the 2 wt.% nSiO 2 /PLA/HDPE composite as 147.3 MPa tensile strength and 4.05 GPa Young's modulus. Subsequently, the material characteristics of the 2 wt.% nSiO 2 -reinforced composite were investigated with various analytical techniques. FESEM micrographs revealed that the developed composites with a rougher surface promoted cell attachment and proliferation and had no delaminated parts in the printed layer. EDAX analysis confirmed the reinforcement material nSiO 2 particles present in the developed composite. The prominent sharp peaks of nSiO 2 incorporated in the 3D-printed composite have an excellent crystallinity nature with 84.3%. The presence of nSiO 2 reinforcement in the composite matrix was confirmed by FTIR and Raman spectroscopy. TGA/DTG results displayed the 7.36% high thermal stability of the nSiO 2 -reinforced composite. Thus, the developed composite was found to be a promising material for bone implants in biomedical applications.

关键词： Nano SiO 2 3D printing polylactic acid high-density polyethylene mechanical properties

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An Integrated Control Framework for Torque Vectoring and Active Suspension System

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Chinese Journal of mechanical engineering 2024年第1期37卷 62-73页

作者： Jiwei Feng Jinhao Liang Yanbo Lu Weichao Zhuang Dawei Pi Guodong Yin Liwei Xu Pai Peng Chaobin Zhou School of Mechanical Engineering Southeast UniversityNanjing 211189China School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing 210094China School of Mechano-Electronic Engineering Lanzhou University of TechnologyLanzhou 730050China

Four-wheel independently driven electric vehicles(FWID-EV)endow a flexible and scalable control framework to improve vehicle *** paper integrates the torque vectoring and active suspension system(ASS)to enhance the vehicle’s longitudinal and vertical motion control *** the nonlinear characteristic of the tire model leads to a relatively heavier computational *** facilitate the controller design and ease the load,a half-vehicle dynamics system is built and simplified to the linear-time-varying(LTV)*** a model predictive controller is developed by formulating the objective function by comprehensively considering the safety,energy-saving and comfort *** in-wheel motor efficiency and the power loss of tire slip are treated as optimization indices in this work to reduce energy ***,the effectiveness of the proposed controller is verified through the rapid-control-prototype(RCP)*** results demonstrate the enhancement of the energy-saving as well as comfort on the basis of vehicle stability.

关键词： Four-wheel independently driven electric vehicles Tire nonlinearity Linear-time-varying(LTV)model Model predictive control Rapid control prototype

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An investigation on multilayer shape memory polymers under finite bending through nonlinear thermo-visco-hyperelasticity

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Applied Mathematics and Mechanics(English Edition) 2023年第1期44卷 73-88页

作者： A.BAKHTIYARI M.BAGHANI S.SOHRABPOUR School of Mechanical Engineering College of EngineeringUniversity of TehranTehran ***Iran Department of Mechanical Engineering Sharif University of TechnologyTehran ***Iran

This study presents a semi-analytical solution to describe the behavior of shape memory polymers(SMPs) based on the nonlinear thermo-visco-hyperelasticity which originates from the concepts of internal state variables and rational *** method is developed for the finite bending of multilayers in a dual-shape memory effect(SME) *** layer number and layering order are investigated for two different SMPs and a hyperelastic *** addition to the semi-analytical solution,the finite element simulation is performed to verify the predicted results,where the outcomes demonstrate the excellent accuracy of the proposed solution for predicting the behavior of the multilayer *** this method has a much lower computational cost than the finite element method(FEM),it can be used as an effective tool to analyze the SMP behavior under different conditions,including different materials,different geometries,different layer numbers,and different layer arrangements.

关键词： smart material shape memory polymer(SMP) semi-analytical solution thermo-visco-hyperelasticity finite strain bending

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Effect of selective laser sintering and pressure-less casting methods on mechanical and physical properties of Al2O3/PA12 nano-composite

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Sadhana - Academy Proceedings in engineering Sciences 2025年第2期50卷 1-12页

作者： Tiwari, Sunil Kumar Barnwal, Vivek Kumar Pande, Sarang Bobade, Santosh M Department of Mechanical Engineering Jaypee University of Engineering & Technology Guna India Department of Manufacturing Engineering School of Mechanical Engineering Vellore Institute of Technology Vellore632014 India Department of Mechanical Engineering Marwadi Education Foundations Group of Institutions Rajkot India Department of Physics Jaypee University of Engineering & Technology Guna India

The selective laser sintering (SLS) is an important additive manufacturing process widely known for its ability to produce both prototype and end-use functional parts with ease. One of the issues with the SLS process is its high material exploitation and processing cost for low volume production and development of a new material. In view of this, the present paper is aimed at developing an alternative process suitable for small batch production of a nano-composite. Since, fire-retardation is an important concern for industrial suitability of composites, a fire-retardant composite comprising Aluminium Oxide (Al2O3) ceramic in polyamide (PA12) matrix was considered for this study. A conventional casting process, known as pressure-less casting, was used to prepare the standard specimens of Al2O3/PA12 composite in different weight proportions of Al2O3 and PA12. The material development process required material characterization, thermal and rheological analysis of all the specimens to select the optimal fraction of Al2O3 and PA12 material. The comprehensive material and physical characterization of the Al2O3/PA12 composite provided several valuable insights for deciding operating process parameters for SLS technique. For example, the study reveals that the SLS process parameters are material dependent. The melting point of the material increases due to cyclic heating. Similarly, the rheological property and melt flow index of the material also change due to rise in temperature. In view of this, the part bed temperature needs to be modified for each new cycle before processing in SLS machine. Overall, the pressure-less casting can be used successfully for developing nano-composites for SLS. The study reveals that a small addition of Al2O3 in PA12 improves both mechanical properties and fire-retardation properties significantly. © Indian Academy of Sciences 2025.

关键词： Refining

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A novel multi-resolution network for the open-circuit faults diagnosis of automatic ramming drive system

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Defence technology（防务技术） 2024年第4期34卷 225-237页

作者： Liuxuan Wei Linfang Qian Manyi Wang Minghao Tong Yilin Jiang Ming Li School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing 210094JiangsuChina Northwest Institute of Mechanical and Electrical Engineering Xianyang 712099China

The open-circuit fault is one of the most common faults of the automatic ramming drive system(ARDS),and it can be categorized into the open-phase faults of Permanent Magnet Synchronous Motor(PMSM)and the open-circuit faults of Voltage Source Inverter(VSI). The stator current serves as a common indicator for detecting open-circuit faults. Due to the identical changes of the stator current between the open-phase faults in the PMSM and failures of double switches within the same leg of the VSI, this paper utilizes the zero-sequence voltage component as an additional diagnostic criterion to differentiate *** the variable conditions and substantial noise of the ARDS, a novel Multi-resolution Network(Mr Net) is proposed, which can extract multi-resolution perceptual information and enhance robustness to the noise. Meanwhile, a feature weighted layer is introduced to allocate higher weights to characteristics situated near the feature frequency. Both simulation and experiment results validate that the proposed fault diagnosis method can diagnose 25 types of open-circuit faults and achieve more than98.28% diagnostic accuracy. In addition, the experiment results also demonstrate that Mr Net has the capability of diagnosing the fault types accurately under the interference of noise signals(Laplace noise and Gaussian noise).

关键词： Fault diagnosis Deep learning Multi-scale convolution Open-circuit Convolutional neural network

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Variable Admittance Control of High Compatibility Exoskeleton Based on Human-Robotic Interaction Force

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Chinese Journal of mechanical engineering 2024年第5期37卷 409-423页

作者： Jian Cao Jianhua Zhang Chang Wang Kexiang Li Jianjun Zhang Guihua Wang Hongliang Ren School of Mechanical Engineering Hebei University of TechnologyTianjin 300401China School of Mechanical Engineering University of Science and Technology BeijingBeijing 100083China School of Mechanical and Materials Engineering North China University of TechnologyBeijing 100144China Department of Electronic Engineering The Chinese University of Hong KongHong Kong 999077NTChina

The wearable exoskeleton system is a typical strongly coupled human-robotic ***-robotic is the environment for each *** two support each other and compete with each *** high human-robotic compatibility is the most critical technology for wearable *** structural compatibility can improve the intrinsic safety of the exoskeleton,and precise intention understanding and motion control can improve the comfort of the *** paper first designs a physiologically functional bionic lower limb exoskeleton based on the study of bone and joint functional anatomy and analyzes the drive mapping model of the dual closedloop four-link knee ***,an exoskeleton dual closed-loop controller composed of a position inner loop and a force outer loop is *** inner loop of the controller adopts the PID control algorithm,and the outer loop adopts the adaptive admittance control algorithm based on human-robot interaction force(HRI).The controller can adaptively adjust the admittance parameters according to the HRI to respond to dynamic changes in the mechanical and physical parameters of the human-robot system,thereby improving control compliance and the wearing comfort of the exoskeleton ***,we built a joint simulation experiment platform based on SolidWorks/Simulink to conduct virtual prototype simulation experiments and recruited volunteers to wear rehabilitation exoskeletons to conduct related control *** results show that the designed physiologically functional bionic exoskeleton and adaptive admittance controller can significantly improve the accuracy of human-robotic joint motion tracking,effectively reducing human-machine interaction forces and improving the comfort and safety of the *** paper proposes a dual-closed loop four-link knee joint exoskeleton and a variable admittance control method based on HRI,which provides a new method for the design and control of exoskeletons with hi

关键词： Limb exoskeleton Strongly coupled system Human-robot interaction Admittance control

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Investigation of Tribological Behavior of Fused Deposition Modelling Processed Parts of Polyethylene Terephthalate Glycol Polymer Material

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Journal of The Institution of Engineers (India): Series D 2025年 1-16页

作者： Jagadeesha, T. Kumar, K. V. Pradeep Tilak Reddy, Maramreddy Raghu Sankarathil, Aju Jo Raju, K. Junaidi, Md. Abdul Raheem Bhat, Subraya Krishna Shashidhara, L.C. Revanna, K. Raghavendra, N. Udayashankar, S. Mechanical Engineering Department National Institute of Technology Kerala Calicut673601 India Mechanical Engineering Department Ramaiah Institute of Technology Karnataka Bengaluru560054 India Mechanical Engineering Department New Horizon College of Engineering Karnataka Bangalore560103 India Mechanical Engineering Department Saintgits College of Engineering Kerala Kottayam686532 India Department of Mechanical Engineering St. Joseph Engineering College Mangaluru575028 India Mechanical Engineering Department Muffakham Jah College of Engineering and Technology Telangana Hyderabad500034 India Department of Mechanical and Industrial Engineering Manipal Institute of Technology Manipal Academy of Higher Education Karnataka Manipal576104 India Mechanical Engineering Department Dayananda Sagar University Karnataka Ramanagara Bengaluru562112 India Department of Mechanical Engineering Government Engineering College Krishnarajapet571426 India Department of Mechanical Engineering BNM Institute of Technology Karnataka Bangalore560070 India Department of Mechanical Engineering VTU Karnataka Belgaum590018 India

In the current study an attempt is made to study the tribological characteristics of 3D printed Polyethylene Terephthalate Glycol (PETG) parts when subjected to wet sliding. Initially the Fused Deposition Modeling (FDM) of Polyethylene Terephthalate Glycol filament is carried out. The tribological characteristics like Coefficient of Friction, specific wear rate, time dependent variation of Friction force and wear are studied by conducting a wear test of the specimens. The results prove the well known theory that the addition of lubricant in between the sliding surfaces reduces the COF and wear rate. The outcomes of the pin-on-disc tests reveal that, the wear is increasing rapidly after a small period of constant wear as the test progresses. The repeated sliding motion generates frictional forces between the surfaces. Even with a relatively low COF, constant contact and movement leads to material removal. This is also observed in the frictional force versus time graph where an increase in frictional force as test progresses is observed. A COF of around 0.5 is obtained for dry siding case. In wet sliding condition, a COF of 0.2 is obtained. Hence the lubricant was effective in reducing the effect of frictional forces. A wear rate of 5 × 10−4 mm3/Nm was attained for dry sliding case. In the present work a wear rate of 1 × 10−4 mm3/Nm was attained in wet sliding case. From the test results of the surface Profilometer, it is found that there is a reduction in Ra, Rq and Rz values in the after sliding test condition as compared to the before test condition. As part of the practical application, there is the possibility of enhancing parts used in the aviation and automobile sectors. © The Institution of Engineers (India) 2025.

关键词： Polyethylene terephthalates

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Theoretical Modeling and Surface Roughness Prediction of Microtextured Surfaces in Ultrasonic Vibration-Assisted Milling

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Chinese Journal of mechanical engineering 2024年第2期37卷 163-183页

作者： Chenbing Ni Junjie Zhu Youqiang Wang Dejian Liu Xuezhao Wang Lida Zhu School of Mechanical and Automotive Engineering Qingdao University of TechnologyQingdao 266525China School of Mechanical Engineering and Automation Northeastern UniversityShenyang 110819China

Textured surfaces with certain micro/nano structures have been proven to possess some advanced functions,such as reducing friction,improving wear and increasing *** prediction of micro/nano surface textures is of great significance for the design,fabrication and application of functional textured *** this paper,based on the kinematic analysis of cutter teeth,the discretization of ultrasonic machining process,transformation method of coordinate systems and the cubic spline data interpolation,an integrated theoretical model was established to characterize the distribution and geometric features of micro textures on the surfaces machined by different types of ultrasonic vibration-assisted milling(UVAM).Based on the theoretical model,the effect of key process parameters(vibration directions,vibration dimensions,cutting parameters and vibration parameters)on tool trajectories and microtextured surface morphology in UVAM is ***,the effect of phase difference on the elliptical shape in 2D/3D ultrasonic elliptical vibration-assisted milling(UEVAM)was *** to conventional numerical models,the method of the cubic spline data interpolation is applied to the simulation of microtextured surface morphology in UVAM,which is more suitable for characterizing the morphological features of microtextured surfaces than traditional methods due to the presence of numerous micro *** prediction of surface roughness indicates that the magnitude of ultrasonic amplitude in z-direction should be strictly limited in 1D rotary UVAM,2D and 3D UEVAM due to the unfavorable effect of axial ultrasonic vibration on the surface *** study can provide theoretical guidance for the design and fabrication of microtextured surfaces in UVAM.

关键词： Theoretical modeling Microtextured surface Ultrasonic vibration-assisted milling Cubic spline interpolation Surface roughness

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