检索结果-内蒙古大学图书馆

Integration of fuzzy logic with response surface methodology for predicting the effect of process parameters on build time and model material volume in fdm process

Lecture Notes in Mechanical Engineering

引用

Lecture Notes in Mechanical engineering 2016年 195-206页

作者： Srivastava, Manu Maheshwari, Sachin Kundra, T.K. Yashaswi, Ramkrishna Rathee, Sandeep Division of Manufacturing Processes and Automation Engineering Netaji Subhas Institute of Technology New Delhi India Department of Mechanical Engineering Indian Institute of Technology New Delhi India Computer Sciences Corporation Ltd. New Delhi India

Fused Deposition Modelling (FDM) is a promising additive manufacturing (AM) technique used for various prototyping requirements where relatively cheap yet robust models are required. To improve FDM process effectiveness, appropriate process parameters selection is required for high productivity and cost effectiveness. Build time (BT) and volume of Model material (MMV) required are important responses to measure cost effectiveness. In this work, response surface methodology (RSM) and fuzzy logic (FL) have been applied to reduce the build time and model material volume for experimentation. The process parameters namely contour width, air gap;raster angle and spatial orientation are considered. Also, build time and model material volume has been taken as responses for this study. Thirty experiments were conducted on Acrylobutadiene Styrene (ABS) P400 for conical primitives using full factorial central composite RSM design. The optimum process parameter conditions were obtained from FL. The results obtained provide useful information of the method to control responses and ensure minimal build time and model material volume for prototyping requirements. The assessment outcome provided a scientific reference to obtain minimal values of build time and model material volume utilized, and it was found out that these correspond to a contour width of 0.654 mm, air gap of 0.0254 mm, raster angle of 0° and orientation (rotation about x-axis keeping z height minimum) of 30°. © Springer India 2016.

关键词： Fuzzy logic

来源：评论

学校读者我要写书评

暂无评论

Process parameters optimization for enhanced microhardness of AA 6061/ SiC surface composites fabricated via Friction Stir Processing (FSP)

引用

Materials Today: Proceedings 2016年第10期3卷 4151-4156页

作者： Sandeep Rathee Sachin Maheshwari Arshad Noor Siddiquee Manu Srivastava Satish Kumar Sharma Division of Manufacturing Processes and Automation Engineering Netaji Subhas Institute of Technology New Delhi India Department of Mechanical Engineering Jamia Millia Islamia University New Delhi India

In this research work, Taguchi’s experimental design is adopted for achieving maximum micro-hardness values for AA6061/SiC surface composites fabricated using friction stir processing. This was achieved by optimizing friction stir processing parameters. Three process parameters namely tool rotational speed, tool traverse speed and tool tilt angle with three levels each were chosen to maximize microhardness values. Nine experiments were performed strictly as per Taguchi L 9 orthogonal array. After single pass friction stir processing, microhardness of all the samples were tested on Vickers digital microhardness tester. The obtained results were analyzed with the help of signal to noise (S/N) ratio. The effect of all three parameters on microhardness values was studied. The analysis of signal to noise (S/N) ratio showed that maximum micro hardness was achieved when tool rotational speed, traverse speed and tilt angle were selected as 1400 rpm, 50 mm/min and 2.5˚ respectively.

关键词： Friction Stir Processing Microhardness Taguchi Orthogonal Array process parameters

来源：评论

学校读者我要写书评

暂无评论

Optimal nonlinear system identification using fractional delay second-order volterra system

引用

IEEE/CAA Journal of Automatica Sinica 2016年

作者： Kumar, Manjeet Aggarwal, Apoorva Rawat, Tarun Parthasarathy, Harish Department of Electronics and Communication Engineering Division Netaji Subhas Institute of Technology Sector-3 Dwarka New Delhi 110078 India

The aim of this work is to design a fractional delay second order Volterra filter that takes a discrete time sequence as input and its output is as close as possible to the output of a given nonlinear unknown system which may have higher degree nonlinearities in the least square sense. The basic reason for such a design is that rather than including higher than second degree nonlinearities in the designed system, we use the fractional delay degrees of freedom to approximate the given system. The advantage is in terms of obtaining a better approximation of the given nonlinear system than is possible by using only integer delays (since we are giving more degrees of freedom via the fractional delays) and simultaneously it does not require to incorporate higher degree nonlinearities than two. This work hinges around the fact that if the input signal is a decimated version of another signal by a factor of M, then fractional delays can be regarded as delays by integers less than M. Using the well known formula for calculating the discrete time Fourier transform (DTFT) of a decimated signal, we then arrive at an expression for the DTFT of the output of a fractional delay system in terms of the unknown first and second order Volterra system coefficients and the fractional delays. The final energy function to be minimized is the norm square of the difference between the DTFT of the given output and the DTFT of the output of the fractional delay system. Minimization over the filter coefficients is a linear problem and thus the final problem is to minimize a highly nonlinear function of the fractional delays which is accomplished using search techniques like the gradient-search and nature inspired optimization algorithms. The effectiveness of the proposed method is demonstrated using two nonlinear benchmark systems tested with five different input signals. The accuracy of the stated models using the globally convergent metaheuristic, cuckoo-search algorithm (CSA) are observed

关键词： Nonlinear systems

来源：评论

学校读者我要写书评

暂无评论

Learning Vector Quantization Neural Network Based External Fault Diagnosis Model for Three Phase Induction Motor Using Current Signature Analysis

引用

Procedia computer Science 2016年 93卷 1010-1016页

作者： Gaurav Kumar Sandeep Sharma Hasmat Malik Electrical Engineering Department Indian Institute of Technology Delhi 110016 India Department of electrical engineering Baddi university of engineering sciences and technology Makhnumajara Baddi H.P. 173205 India ICE Division Netaji Subhas Institute of Technology Delhi 110078 India

Fault Diagnosis and Conditioning monitoring (FDCA) of three phase induction motor is substantial as the induction machines play a pivotal role in industries & hence their safe operations are desired. FDCA of an induction motor (IM) can increase its operational life and efficiency. In this paper, FDCA of induction motors is done on the basis of available dataset. Induction motors external faults are online controlled by LVQ i.e. vector quantization by learning & then the comparison is done with MLP neural network, which states that the fault identification by LVQ is better & less time consuming than MLP. For the diagnosis of external faults & normal condition in induction motor's RMS voltages and RMS currents have been used as input variables for the proposed algorithm. In this paper, LVQ model is used to investigate seven states of IM under different operating conditions with the help of 160 testing samples.

关键词： learning Vector Quantization motor current signature analysi induction motor Artificial Intelligence

来源：评论

学校读者我要写书评

暂无评论

A Space based reversible high capacity text steganography scheme using Font type and style

A Space based reversible high capacity text steganography sc...

引用

International Conference on Computing, Communication and Automation

作者： Rajeev Kumar Aruna Malik Samayveer Singh Bijendra Kumar Satish Chand Division of Computer Engineering Netaji Subhas Institute of Technology New Delhi-78 India Department of Computer Science and Engineering National Institute of Technology Jalandhar Punjab India School of Computer and Systems Sciences Jawaharlal Nehru University New Delhi Delhi-67 India

ISBN: (纸本)9781509016679

In this paper, we propose a space character based reversible high capacity text steganography scheme which embeds the secret data into a Microsoft word document. The scheme hides the secret data bits into the white spaces by changing their font type and style. Since the white spaces are invisible characters, the changes made in their style as well as in their font type do not raise suspicion. Thus, the changes made in the cover text are invisible which counter the visual attacks. We don't add extra space or characters to embed the secret data which helps in increasing hiding efficiency. Our scheme is also more robust as well as has higher hiding capacity in comparison to the other existing schemes.

关键词： DASH Font Type Text Steganography Style

来源：评论

学校读者我要写书评

暂无评论

Reversible Data Hiding Scheme for LZW codes using Even-odd Embedding strategy

Reversible Data Hiding Scheme for LZW codes using Even-odd E...

引用

International Conference on Computing, Communication and Automation

ISBN: (纸本)9781509016679

This paper proposes a reversible data hiding scheme which embeds the secret data into LZW codes using even odd embedding strategy. It firstly compresses the cover media using LZW algorithm and then constructs a location map of the LZW codes based on their value. The secret data bit stream is converted into base3 representation and then the output LZW codes are used to embed the secret data in two phases. In the first phase, we embed the secret data in the odd valued pixels and in subsequent phase, the secret data digits are embedded into the even valued pixels. The LZW code value is either modified by ±2 or left unchanged for embedding the secret data. Therefore, this scheme is very simple as it basically increases or decreases the pixel value for embedding the secret data. From the experimental results, it is clearly evident that our scheme is able to hide more secret data than the existing state of the art schemes.

关键词： Even pixel Odd pixel LZW Data hiding Codes

来源：评论

学校读者我要写书评

暂无评论

A constrained re-growing concept for object separation in sea images

A constrained re-growing concept for object separation in se...

引用

International Conference on Confluence The Next Generation Information technology Summit (Confluence)

作者： Prateek Singh Sengar Surabhi Singh Naman Garg Deptt. of Electronics and Communication Engineering Amity University Uttar Pradesh Division of Electronics and Communication Engineering Netaji Subhas Institute of Technology New Delhi India

ISBN: (纸本)9781467382045

In this paper, we present a technique to separate touching objects. This technique is divided into two stages; first separation of objects is achieved by successive threshold slicing, in this process most objects are reduced in size. Then, in order to regain the approximate size and shape the separated objects are re-grown to their original forms under the guidelines of a set of rules. Pixels having the potential for re-growth are identified. The pixel is re-grown only if its re-growth does-not disturb the established separation. We therefore allow separated objects to approximately regain their shape and size by constrained re-growing while maintaining the established separation. In this paper, we apply this algorithm to Synthetic Aperture Radar (SAR) images of sea ice floes.

关键词： Shape Skin Sea ice Synthetic aperture radar Algorithm design and analysis Approximation algorithms

来源：评论

学校读者我要写书评

暂无评论

Generation of PWM using verilog In FPGA

Generation of PWM using verilog In FPGA

引用

International Conference on Electrical, Electronics, and Optimization Techniques (ICEEOT)

作者： Rohan Srivastava Yogesh K. Chauhan Bhavnesh Kumar School of Engineering Gautam Buddha University Greater Noida Uttar Pradesh India Division of ICE Netaji Subhas Institute of Technology Dwarka New Delhi India

ISBN: (纸本)9781467399401

In this paper a new approach of generating the Pulse width modulation (PWM) signals which are to be used in various power electronics application like power converters and inverters is presented. Pulse Width Modulation (PWM) triggers the gate terminals of the power electronic semiconductor devices like thyristors, Insulated-Gate Bipolar Transistors (IGBTS), Metal Oxide Semiconductor Field Effect Transistors (MOSFET) etc. which are used as switches for voltage regulation. The pulses are generated using hardware description language (HDL) which is suitable for usage in Spartan-3E Field Programmable Gate Array (FPGA) board which is used as high performance controller in vector control of induction motor. Simulation is done in Model Sim 6.2b environment and results are obtained validated with register transfer level (RTL) schematic.

关键词： Pulse width modulation Field programmable gate arrays Hardware design languages Inverters Radiation detectors Logic gates Voltage control

来源：评论

学校读者我要写书评

暂无评论

An improved edge detection approach and its application in defect detection

引用

IOP Conference Series: Materials Science and engineering 2017年第1期244卷

作者： Vilas H Gaidhane Navdeep Asha Rani Vijander Singh Electrical and Electronics Engineering Department BITS Pilani Dubai Campus Dubai International Academic City UAE ICE Division Netaji Subhas Institute of Technology New Delhi India

In this paper, a simple and efficient edge detection technique is proposed. It is based on the properties of the hyper smoothing function and the fundamentals of modified local binary pattern and hence, called as HY-LBP. The main advantage of the proposed approach is that the relationship between surrounding pixels and centric one is calculated effectively and extract the surrounding information discriminatively. The counting scheme that counts the number of image points whose pixel values are greater or equal than that of the central pixel help to reduce the noise and blurring effects. Thus, HY-LBP can effectively deal with the noises, blurring, and contrast variation. The effectuality and feasibility of the proposed approach is demonstrated on various synthetic and real time images. Experimental results have shown the effectiveness as well as the better performance of the proposed approach for edge detection as compared to the other existing methods. The presented method can be used in metal sheet defect detection applications.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Fuzzy based support system for melanoma diagnosis 3rd

Fuzzy based support system for melanoma diagnosis

引用

3rd International Conference on Mining Intelligence and Knowledge Exploration, MIKE 2015

作者： Gupta, Anand Tiwari, Devendra Agarwal, Siddharth Jain, Monal Department of Computer Engineering Netaji Subhas Institute of Technology New Delhi110078 India Department of Instrumentation and Control Engineering Netaji Subhas Institute of Technology New Delhi110078 India

ISBN: (纸本)9783319268316

Early detection of Melanoma (skin cancer) and its classes (Malignant, Atypical, Common Nevus) is always beneficial for patients. Till now researchers have designed many computer Aided Detection (CAD) systems which have focused on providing binary results (i.e. either presence or absence of any class of melanoma). As these systems do not provide relative extent of lesions belonging to each class, they usually lack decision support for dermatologists (in case of suspiciousness of a lesion) and complete reliability for routine clinical use. To overcome these problems, a two stage framework is proposed incorporating a new fuzzy membership function based on Lagrange Interpolation Curve Fitting method. This framework returns analogue values for a lesion which represents its relative extent in a particular class (helpful in recreating suspiciousness), hence having a greater degree of acceptability among dermatologists. A two stage CAD framework proposed here uses PH2 dermoscopic image dataset as input. In the first stage pre-processing, segmentation and feature extraction is performed while in the next stage fuzzy membership values for the three classes are calculated using Gaussian, Bell and the proposed membership function. A comparative study is done on the basis of sensitivity and specificity for the three membership functions. © Springer International Publishing Switzerland 2015.

关键词： Membership functions

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：