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arXiv 2020年

作者： Li, Ying Li, Wei Han, Tiancheng Zheng, Xu Li, Jiaxin Li, Baowen Fan, Shanhui Qiu, Cheng-Wei Department of Electrical and Computer Engineering National University of Singapore Singapore117583 Singapore Interdisciplinary Center for Quantum Information State Key Laboratory of Modern Optical Instrumentation College of Information Science and Electronic Engineering Zhejiang University Hangzhou310027 China ZJU-Hangzhou Global Science and Technology Innovation Center Key Lab. of Advanced Micro/Nano Electronic Devices & Smart Systems of Zhejiang Zhejiang University Hangzhou310027 China Department of Electrical Engineering Ginzton Laboratory Stanford University StanfordCA94305 United States National Engineering Research Center of Electromagnetic Radiation Control Materials State Key Laboratory of Electronic Thin Film and Integrated Devices University of Electronic Science and Technology of China Chengdu610054 China Department of Physics University of Colorado BoulderCO80309 United States School of Mechatronics Engineering Harbin Institute of Technology Harbin150001 China Paul M. Rady Department of Mechanical Engineering University of Colorado BoulderCO80309 United States

| The demand for sophisticated tools and approaches in heat management and control has triggered fast development of emerging fields including conductive thermal metamaterials, nanophononics, far-field and near-field radiative thermal management, etc. In this review, we cast a unified perspective on the control of heat transfer, based on which the related studies can be considered as complementary paradigms toward manipulating physical parameters and realizing unprecedented phenomena in heat transfer using artificial structures, such as thermal conductivity in heat conduction, thermal emissivity in radiation, and properties related to multi-physical effects. The review is divided into three parts that focus on the three main categories of heat flow control, respectively. Thermal conduction and radiation are emphasized in the first and second parts at both macro- and micro-scale. The third part discusses the efforts to actively introduce heat sources or tune the material parameters with multi-physical effects in both conduction and radiation, including works using thermal convection. We conclude the review with challenges in this research topic and new possibilities about topological thermal effects, heat waves, and quantum thermal effects. Copyright © 2020, The Authors. All rights reserved.

关键词： Metamaterials

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Investigation on influence of Nitinol wire made tailored structure manufactured using MIG additive technique for machine tool operations

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Materials Today: Proceedings 2018年第10期5卷 21350-21354页

作者： Priya Chouhan Shashwat Sharma Shreyas Gulhane I.A. Palani B.K. Lad Mechatronics and Instrumentation Lab Department of Mechanical Engineering Indian Institute of Technology Indore India Department of Mechanical Engineering Acropolis Institute of Technology and Research Indore India Dr. Babasaheb Ambedkar College of Engineering and Research Nagpur India Centre for Material Science and Engineering Indian Institute of Technology Indore India Reliability Engineering Lab Indian Institute of Technology Indore India

As the field of smart material evolves, it is imperative to develop new technologies to use unique properties of Shape memory alloys (SMAs) in more complicated tasks. In today’s world where technology leads, it is necessary to look out for the products with greater accuracy, quality and surface finish. For achieving this, proper machine and components are required. In this work, Shape Memory Alloys (SMA) structure is manufactured using MIG welding. These SMA structures will be helpful in damping out vibrations in various machine tool operations which leads to better dimensional accuracy and increases life cycle of the component. Various characterization techniques have been performed for this work. Structural, compositional and morphological techniques have been performed to analyze the structure properly and thoroughly. Further micro structural study is underway

关键词： Shape memory alloy MIG welding X-Ray diffraction

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Investigation on hot fluid based actuation of SMA spring and their application for the development of heat engine

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AIP Conference Proceedings 2018年第1期2018卷

作者： A. Verma K. Anand V. M. Hari T. Nath I. A. Palani 1Mechatronics and Instrumentation Lab Discipline of Mechanical Engineering Indian Institute of Technology Indore Simrol-453552 India 2Mechatronics and Instrumentation Lab Discipline of Mechanical Engineering Indian Institute of Technology Indore Simrol-453552 India 3Mechatronics and Instrumentation Lab Discipline of Mechanical Engineering Indian Institute of Technology Indore Simrol-453552 India 4Mechatronics and Instrumentation Lab Discipline of Mechanical Engineering Indian Institute of Technology Indore Simrol-453552 India 5Mechatronics and Instrumentation Lab Discipline of Mechanical Engineering Indian Institute of Technology Indore Simrol-453552 India

Shape Memory Alloys (SMA) were invented many years ago, though using of SMA in applications related to engineering is only prominent from last few years. Reason behind using SMA is its ability to change its crystalline structure by applying a temperature gradient. Its simultaneous memory effect and elastic behavior makes it suitable for applications involving actuation and control. In this process of finding application of this interesting material, a device for conversion of waste heat into work could be of utmost importance. The proposed engine consists of group of SMA springs, stretched at one end connected with hub and other end connected to an aluminium wheel, due to the change in the position of centre of gravity, synchronized to rotate in a direction. During operation, the engine is positioned between two distinct thermal reservoirs such that half of its springs are heated by heat energy (medium which acts as a source) while the other half are cooled by an normal atmosphere. Springs on the hot side attempt to contract, driving the engine in the direction that relieves the heat-induced stress. In this work, two different hot reservoirs namely hot water and exhaust gas of an automobile engine was used. When this setup is inserted in hot side of around 80°C or more, the ring begins to rotate. Then work is done thus serving purpose of converting waste heat into mechanical work.

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Surface plasmon mediated optoelectronic property tuning of ZnO nanorods for UV sensing

Surface plasmon mediated optoelectronic property tuning of Z...

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International Conference on Fibre Optics and Photonics, Photonics 2016

作者： Dixit, Tejendra Palani, I.A. Singh, Vipul Department of Electrical Engineering IIT Indore Indore Madhya Pradesh India Mechatronics and Instrumentation Lab Department of Mechanical Engineering IIT Indore Indore Madhya Pradesh India Centre of Material Science and Engineering IIT Indore Indore Madhya Pradesh India

A surface plasmon mediated enhancement (20 times) of UV photodetection at room temperature using Au coated ZnO nanorods have been reported. The results presented have immense potential for ZnO based optoelectronic dev... 详细信息

ISBN: (纸本)9781943580224

关键词： Surface plasmons

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Effect of immobilization technique on performance ZnO nanorods based enzymatic electrochemical glucose biosensor

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Journal of Physics: Conference Series 2017年第1期924卷

作者： Mayoorika Shukla Pramila I.A. Palani Vipul Singh Molecular and Nanoelectronics Research Group (MNRG) Discipline of Electrical Engineering Indian Institute of Technology Indore Indore-453552 Madhya Pradesh India. Mechatronics and Instrumentation Lab Discipline of Mechanical Engineering Indian Institute of Technology Indore Indore-453552 Madhya Pradesh India. Centre for Material Science and Engineering Indian Institute of Technology Indore Indore-453552 Madhya Pradesh India.

In this paper, ZnO Nanorods (ZNR) have been synthesized over Platinum (Pt) coated glass substrate with in-situ addition KMnO4 during hydrothermal growth process. Significant variation in ZnO nanostructures was observed by KMnO4 addition during the growth. Glucose oxidase was later immobilized over ZNRs. The as-prepared ZNRs were further utilized for glucose detection by employing amperometric electrochemical transduction method. In order to optimize the performance of the prepared biosensor two different immobilization techniques i.e. physical adsorption and cross linking have been employed and compared. Further investigations suggest that immobilization via cross linking method resulted in the improvement of the biosensor performance, thereby significantly affecting the sensitivity and linear range of the fabricated biosensor. Among the two types of biosensors fabricated using ZNR, the best performance was shown by cross linked electrodes. The sensitivity for the same was found to be 17.7 mA-cm-2-M-1, along with a wide linear range of 0.5-8.5 mM.

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Parametric investigation on laser forming of 3mm and 5mm FE-410 sheets for brake pedal and clutch pedal applications

Parametric investigation on laser forming of 3mm and 5mm FE-...

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2015 International Conference on Robotics, Automation, Control and Embedded Systems, RACE 2015

作者： D'Souza, Agnel Naikwad, Sanidhya Palani, I.A. Padmanabhan, R. Shanmugam, S. Natu, Harshad Swamy, S. Mechatronics and Instrumentation Lab Centre for Material Science and Engineering IIT Indore India WABCO India Ltd Chennai India Magod Laser Machining Pvt Ltd Banglore India

ISBN: (纸本)9788192597430

Laser forming is a flexible manufacturing process which has potential use in the manufacturing and automotive industry. In this process, a high power laser scans the metal sheet across its length. The metal sheet absorbs the laser and a steep temperature gradient is generated across the sheet thickness. The induced uneven thermal stresses, and the resulting bending moments, during the process deform the sheet metal without the use of any external forces. In this paper, steel sheets of FE-410 are bent using high power CO2 laser. Experiments were performed on 5 mm and 3 mm FE-410 steel sheets using CO2 Laser with maximum energy of 3000 W. Various parameters were varied namely power (1.5 KW to 3 KW), number of passes (0 to 130), scan speed (10 to 30 mm/s), laser spot diameter (4 mm to 13 mm) and frequency (500 Hz to 20000 Hz) to get maximum bend angle. The variation in the bend angle with respect to the power, scan speed, spot diameter, number of passes and thickness is studied. A data set of 320 samples is obtained from the experiment. This data set in the form of multi-input and single output is used to develop an optimum artificial neural network model to predict the bend angle. Here the output variable is bend angle and input variables are laser power, scan speed, spot diameter, sheet thickness and number of passes or scans. Micro-structure analysis of the deformed region and the heat affected zone in comparison with the base material is done. And a comparative study of the variation in micro-hardness of all these regions is done. © 2015 Hindustan University.

关键词： Carbon dioxide

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Failure diagnosis & reliability assessment of NiTi shape memory alloy spring for micro - Actuators

Failure diagnosis & reliability assessment of NiTi shape mem...

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International Conference on Robotics, Automation, Control and Embedded Systems (RACE)

作者： Himanshu Singh Pratik Juikar Tameshwer Nath Tiwari B. K. Lad I. A. Palani Mechatronics & Instrumentation lab Indian Institute of Technology Indore Indore MP India Industrial Engineering Research lab Indian Institute of Technology Indore Indore MP India

Shape memory effect reveals the recovery of original shape from deformed shape with residual strain through thermal cycling. This type of super-elastic behavior found in shape memory alloys are generally used as actuators in robotics, control and embedded systems. In the present study, first an experimental setup was developed to perform life tests of Nickel-Titanium Shape Memory Alloy (NiTi-SMA) springs. Laser displacement sensor and J-type thermocouple was used to measure the displacement and temperature respectively. Data was collected through the Data Acquisition (DAQ) device. Acquired data is then used for failure diagnosis and reliability assessment of NiTi-SMA springs. Accelerated life testing models are developed to estimate the parameters of the life distributions. It was observed that with the subsequent cycles, SMA spring starts losing its inherent property of being an elastic object, and thus a decrease in displacement of it was observed with each cycle. Gradual loss of actuation property of the material under accelerated conditions was investigated in detail using Scanning Electron Microscopy (SEM) and Thermo Gravimetric Analysis (TGA).

关键词： Springs Reliability Scanning electron microscopy Stress Life estimation Temperature measurement Degradation

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Investigation on Laser assisted actuation of shape memory alloy based micro-valve

Investigation on Laser assisted actuation of shape memory al...

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International Conference on Robotics, Automation, Control and Embedded Systems (RACE)

作者： Tameshwer Nath Gaurav Raut Alok Kumar Ritesh Khatri I. A. Palani Mechatronics & Instrumentation lab Indian Institute of Technology Indore Madhya Pradesh India Centre For Material Science and Engineering Indian Institute of Technology Indore Madhya Pradesh India

This research highly focuses towards development of a Shape Memory Alloy based micro valve and actuation using LASER. Numerous Micro valve designs have been reported with a variety of actuation mechanisms such as piezoelectric, silicon rubber, etc. [1], but the use of these micro valves have been limited. Here LASER is used as actuation medium because of noncontact type and low power energy density source. The micro valve is designed and fabricated to control small amounts of fluid flow of the order of μL/sec. Single way trained NiTi Shape Memory Alloy is used in this micro valve. EDX test and DSC test has been performed to get details of properties of NiTi SMA. In the LASER actuation work, detailed parametric studies have been performed by actuating the one way trained SMA at various Laser fluence, actuation time and spot diameter of Laser .Scanning Electron Microscope test has been performed to check for ablation. A micro-valve array for fluid flow control on macroscopic level is described. The micro-valve array is based on innovative design such that flow rate across micro-valve array can be varied with number of micro-valve opened with each micro-valve is laser actuated and spring returned. The actuation of SMA using LASER shows that the maximum deflection obtained for optimum LASER fluence of 25.48mJ/cm 2 is 7.29 mm, The flow measurement was performed using an air meter at pressure difference ranging from 1KPa to 5KPa with minimum rate of flow 325 μL/sec.

关键词： Valves Temperature measurement Fluid flow measurement Laser modes Temperature Shape memory alloys Fluids

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Parametric investigation of substrate temperatures on the properties of Zinc oxide deposited over a flexible polymeric substrate via spray technique

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IOP Conference Series: Materials Science and engineering 2016年第1期149卷

作者： P Rajagopalan Rohit Gagrani Daisuke Nakamura Tatsuo Okada Vipul Singh I A Palani Centre for Material Science and Engineering IIT Indore Indore India. Mechatronics and Instrumentation Lab Department of Mechanical Engineering IIT Indore Indore India. Department of Electrical and Electronic Systems Engineering Kyushu University Kyushu Japan Molecular and Nano-electronics Research Group (MNRG) Department of Electrical Engineering IIT Indore Indore India.

Here we report the influence of substrate temperature (300-500 °C) on the deposition and growth of ZnO over a Flexible polyimide film. Owing to its simplicity, large area deposition capability and Cost effectivity Spray Pyrolysis technique was used. We have modified the conventional process of Spray pyrolysis by spraying for shorter durations and repeating the process which in turn reduced the Island formation of ZnO. Moreover, this technique helped in maintaining the constant temperature and uniformity during the deposition as prolonged spraying reduces the temperature of the heating plate drastically. Photoluminescence (PL) reveals that at 350 and 400° C the defect have reduced. XRD reveals the crystallinity and Impurities present. FE-SEM reveals the structure morphology changes with the change in the substrate temperature. TGA was done to ensure that substrate does not undergoes dissociation at high temperature. It was observed at the film deposited at 400 °C was found to be more uniform, defect free and crystalline. Hence, IV characterization of the film deposited at 400 °C was done which showed good rectification behaviour of the Schottky diodes.

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