检索结果-内蒙古大学图书馆

Dynamic Load Comparison between Fully Coupled and Simplified Models on Offshore Wind Turbines with Jacket Support Structures under Seismic Conditions 28

Dynamic Load Comparison between Fully Coupled and Simplified...

引用

28th International Ocean and Polar engineering Conference, 2018

作者： Lai, Wen-Jeng Su, Wei-Nian Huang, Chin-Cheng Huang, Yi-Mei Mechanical and System Engineering Program Institute of Nuclear Energy Research Taiwan Department of Mechanical Engineering National Central University Taiwan

ISBN: (纸本)9781880653876

The dynamic load calculation of offshore wind turbine is an important technology in the future development of wind turbine industry in Taiwan. This paper presents a simplified equivalent-monopile model of reducing the dynamic load simulation time for offshore wind turbines with jacket support structures under seismic conditions. The FAST v7 code that only simulates monopile substructure is chosen as the analysis tool and is further recompiled to include the effect of seismic-pile-soil interaction in the simplified model. The numerical analysis results are then validated by comparing with the results from the fully coupled model, calculated by Bladed software, in a NREL 5MW offshore wind turbine. Two seismic load scenarios, operational and idling conditions, are studied in this work. The results show that usage of simplified model may offer advantages in preliminary support structure design. The advantages are apparent in seismic simulation since the simplified equivalent-monopile modeling allows current FAST v.7 code constraints relaxed for simulating jacket structures and leads to quicker and more convenient dynamic load calculation. The influence of earthquake and soil flexibility is especially important in design considerations since Taiwan is located in a seismically active region. Thus, the developed simplified numerical model will be helpful to shorten the simulation time of a series of seismic design load cases in the preliminary design phase. Copyright © 2018 by the International Society of Offshore and Polar Engineers (ISOPE)

关键词： Dynamic loads

来源：评论

学校读者我要写书评

暂无评论

A diagnosis framework of hybrid dynamic systems based on time fuzzy petri nets

A diagnosis framework of hybrid dynamic systems based on tim...

引用

作者： Loures, E. Rocha Pascal, J.C. Laboratory for Analysis and Architecture of Systems Toulouse France Graduate Program in Production System Engineering Curitiba Brazil

ISBN: (纸本)008045108X

This paper presents a diagnosis framework based on a qualitative model of the process. Starting from a dynamic abstraction procedure under a defined operating mode a fuzzy partitioning of the variables evolution is made, defining for each measured or observable variable a number of qualitative states. Then time Fuzzy intervals representing the moment of state change are defined. The process behaviour of the operating mode is represented by Time Fuzzy Petri nets (TFPN) model and its evolution is the consequence of events detection due to the partitioning bounds crossing. According to the membership possibility of an event to the estimated time interval and to fuzzy influence knowledge, it is possible to reason about a fault occurrence. The fuzzy data issue from the TFPN components allows evaluating the causes of the fault or failure mode. A model-based diagnosis of a hybrid system is presented. Copyright © 2005 IFAC.

关键词： Hybrid systems

来源：评论

学校读者我要写书评

暂无评论

A Location Estimation Algorithm Combined with TDOA and TOA Considering Repeaters 14

A Location Estimation Algorithm Combined with TDOA and TOA C...

引用

14th International Conference on Ubiquitous and Future Networks, ICUFN 2023

作者： Jeon, Seul-Bi Park, Heui-Seon Jo, Tae-Ho Hwang, Suk-Seung Chosun University Interdisciplinary Program in IT-Bio Convergence System Department of Electronic Engineering Gwangju Korea Republic of

ISBN: (纸本)9798350335385

Location Detection Technology (LDT), which accurately estimates the location of a mobile station (MS), is one of core techniques for the modern communication system. Among various LDTs, Time of arrival (TOA) and Time Difference of Arrival (TDOA) are the most commonly employed method, which calculates the location of MS based on at least three signals from base stations (BSs). In the urban environment, many repeaters have been installed for overcoming the radio shadow area problem of a receiver, but they cause the serious errors of the location estimation when we utilize signals passed through repeaters. In order to enhance this problem, in this paper, we introduce the combined location estimation approach with TDOA and TOA considering the repeater, based on signals from two repeaters and one BS. © 2023 IEEE.

关键词： Time difference of arrival

来源：评论

学校读者我要写书评

暂无评论

A Proposal for Markerless Gait Analysis Based on 3D Points Cloud 14th

A Proposal for Markerless Gait Analysis Based on 3D Points C...

引用

14th International Conference on Information Society and Technology, ICIST 2024

作者： da Rocha, Luiz Gustavo Schitz Rudek, Marcelo Pontifical Catholic University of Parana PUCPR Production and System Engineering Graduate Program – PPGEPS Curitiba Brazil

ISBN: (纸本)9783031714184

This paper proposes a solution for markerless gait analysis based on point cloud data, which are three-dimensional data obtained by sensors such as LiDAR, that can capture body movements in real-time and in various environments. Gait analysis aims to evaluate the differences in symmetry between the left and right sides of the body, which can indicate diseases such as Parkinson’s and Alzheimer’s. The point cloud is a sparse matrix with N points in 3D space and the intensity of reflected light, which does not have an ordering between the points and the minimum distance between them is responsible for the density of the cloud. In the proposed method the point cloud is transformed into voxels, which are cubic units that facilitate data processing, and each set of points in the voxel is used for person detection. The points of the person are used to segment the body parts, and each part is used to estimate the joint position. The joint position is used to construct a rigid body model, where a person is represented by their segments. The rotations and translations of the segment over time are used to build the gait analysis graph. By comparing the rotation of each segment over time, it is possible to calculate the difference between the left and right sides and detect at what moment of the movement the difference is large enough to indicate the onset of pathology. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.

关键词： Neurodegenerative diseases

来源：评论

学校读者我要写书评

暂无评论

Method for modelling the number of HIV and AIDS cases using least square spline Biresponse nonparametric negative binomial regression

引用

MethodsX 2025年 14卷 103336页

作者： Ramadan, Arip Chamidah, Nur Budiantara, I Nyoman Lestari, Budi Aydin, Dursun Doctoral Study Program of Mathematics and Natural Sciences Faculty of Science and Technology Airlangga University Surabaya 60115 Indonesia Information System Study Program Department of Industrial and System Engineering Telkom University Surabaya Campus Surabaya 60231 Indonesia Department of Mathematics Faculty of Science and Technology Airlangga University Surabaya 60115 Indonesia Research Group of Statistical Modeling in Life Science Faculty of Science and Technology Airlangga University Surabaya 60115 Indonesia Statistics Department Faculty of Science and Data Analytics Sepuluh Nopember Institute of Technology Surabaya 60111 Indonesia Department of Mathematics Faculty of Mathematics and Natural Sciences The University of Jember Jember 68121 Indonesia Department of Statistics Faculty of Science Muğla Sıtkı Koçman University Muğla 48000 Turkey Research Scholar at Department of Mathematics University of Wisconsin Oshkosh Algoma Blvd Oshkosh 54901 WI United States

We propose a new statistical modeling method to analyze functional relationship between predictor variables and correlated response variables, and apply it for modeling the number of HIV and AIDS cases influenced by early-age marriages and contraceptive users. The proposed method is LS-Spline BNNBR that is a Biresponse Nonparametric Negative Binomial Regression (BNNBR) based on least squares spline (LS-Spline). To validate the proposed method, we compare it with classical method, namely Ordinary Least Square Biresponse Parametric Negative Binomial Regression (OLS-BPNBR). The results show that the LS-Spline BNNBR method provided deviance value of 7.542334 which is smaller than that of OLS-BPNBR method, namely 7.993935. Thus, the proposed method has better prediction fit than the classical method. • This study discusses new statistical modeling method for the number of HIV and AIDS cases influenced by early-age marriages and contraceptive users where the response variables are correlated with each other. • The model estimation results show that the number of HIV and AIDS cases in Indonesia will decrease if the early-age marriages percentage increases and the contraceptive users percentage decreases. • The results are useful to provide a scientific basis for making policies to control the number of HIV and AIDS cases in Indonesia. © 2025 The Authors

关键词： AIDS BLSSNNBR model Contraceptive user Early-age marriage HIV Least square spline

来源：评论

学校读者我要写书评

暂无评论

Integrating microcontrollers into a modern energy conversion laboratory course

Integrating microcontrollers into a modern energy conversion...

引用

114th Annual ASEE Conference and Exposition, 2007

作者： Haub, Rick Fourney, Robert Hietpas, Steven South Dakota State University United States Center for Power System Studies Electrical Engineering Program

For six years South Dakota State University has implemented major revisions to the Energy Conversion Course to include advanced topics in the area of electric drives. With these changes, the course name has been changed to Electromechanical systems (required 400-level course with lab) to better reflect the content of the course that emphasizes a systems approach to teaching machines, power electronics, and the use of microprocessors in an electric drive system. Over these six years the development of DC permanent magnet and AC inductions motor drive systems has provided more advanced study within the lecture and required laboratory course, wherein students model power electronic drives and motors, conduct simulations to predict system behavior, and then conduct experiments to verify these predictions. The last stage of development in the upgrading of this course and laboratory has focused on a meaningful integration of the microprocessor and its use in electromechanical systems. This paper describes three AC induction motor laboratory exercises, including the objectives and the required hardware and software needed. Exercise 1 follows more traditional exercises concerning the circuit modeling of a 3-hp 3-phase induction motor but with added emphasis in establishing key motor parameters useful in the design of a V/Hz motor drive. Exercise 2 builds on this model and allows students to design/establish key gain parameters for an in-house open-loop V/Hz motor drive that results in optimal speed performance of the induction motor for a given operating point. The in-house V/Hz motor drive has a user interface that allows direct manipulation of these key gain parameters. Exercise 3 provides students a culminating experience requiring them to use their knowledge of the motor and electric drive system to write and implement a pulse-width-modulation and frequency control algorithm that produces the required drive signals to the power stage of the electric drive. This approach

关键词： engineering education

来源：评论

学校读者我要写书评

暂无评论

Lateral force analysis of an acoustic levitated plate using boundary element method 25

Lateral force analysis of an acoustic levitated plate using ...

引用

25th International Congress on Sound and Vibration 2018: Hiroshima Calling, ICSV 2018

作者： Matsumoto, Kosuke Masuda, Arata Kyoto Institute of Technology Master Program of Mechanical and System Engineering Kyoto Japan Kyoto Institute of Technology Mechanical Engineering Kyoto Japan

ISBN: (纸本)9781510868458

In this study, the lateral force acting on an acoustically levitated plate in a near-field acoustic levitation setup is numerically analyzed to understand the in-plane behavior of the levitated plate. A vibrating surface in a ultrasound frequency can levitate a planer object by the effect of the acoustic pressure radiated from the surface. This is called near-field acoustic levitation. At the same time, the sound pressure distribution in the air gap between the radiation surface and the levitated plate generates an acoustic streaming which yield the acoustic viscous stress on the surface of the levitated plate. The resulting force and torque acting on the levitated plate governs the stability and the in-plane motion of the plate. In this paper, the force acting on the levitated plate is calculated by integrating the acoustic viscous stress which is derived through the Nyborg's formulation of the acoustic streaming and the sound field analysis using the boundary element method (BEM), which can properly take account of the effect of the infinite medium. The validity of the calculation is verified by comparing the calculated force with experimental results reported in the *** dependence of the force on the lateral position of the levitated plate is then discussed in terms of the in-plane stability. © 25th International Congress on Sound and Vibration 2018, ICSV 2018: Hiroshima Calling. All rights reserved.

关键词： Boundary element method

来源：评论

学校读者我要写书评

暂无评论

GX: A new launch vehicle under development to meet the demands of the medium class satellite market

GX: A new launch vehicle under development to meet the deman...

引用

21st International Communications Satellite systems Conference and Exhibit, ICSSC 2003

作者： Winston, Dan Winn, Robert Oka, Toshiharu GX Program System Engineering Lockheed Martin Corporation Denver CO United States GX Program Advanced Mission Integration Lockheed Martin Corporation Denver CO United States GX Program System Engineering Ishikawajima-Harima Heavy Industries Co. Ltd. Tokyo Japan

ISBN: (纸本)9781624100932

The Galaxy Express (GX) launch vehicle currently under development is targeted to meet market demands in the medium class payload-lifting arena. A joint venture between the Galaxy Express Corporation (GALEX), other Japan industry partners and Lockheed Martin brings together the best in experience and technologies from around the globe focusing its efforts on a low cost, highly reliable launch vehicle to meet market demands beginning in 2006. © 2003 by Lockheed Martin.

关键词： Galaxies

来源：评论

学校读者我要写书评

暂无评论

Japanese character (Kana) pattern recognition application using neural network

Japanese character (Kana) pattern recognition application us...

引用

2011 International Conference on Electrical engineering and Informatics, ICEEI 2011

作者： Budiwati, Sari Dewi Haryatno, Joko Dharma, Eddy Muntina Information System Study Program Telkom Polytechnic Indonesia Electrical Engineering Department Institute Technology of Telkom Indonesia

ISBN: (纸本)9781457707520

Japanese language has complex writing systems, Kanji and Kana (Katakana and Hiragana). Each one has different style of writing. One simple way to differentiate is Kanji have more strokes than Kana. Meanwhile, it needs a lot of effort to remember characters of Katakana and Hiragana, thus it will be very difficult to distinguish handwritten Katakana and Hiragana, since there are a lot of similar characters. This is the reason why we need pattern recognition. Handwriting recognition has been the object of intensive research during the last decades, including Japanese characters recognition. In this research, we build an application to recognize Kanas character handwriting. Pattern recognition on Kana is started based on Optical Character Recognition (OCR) consist of scan image, preprocessing, feature extraction and post-processing. Classification process will be done in post-processing using neural network back propagation. The processing of input images, involves training and testing image. Training image uses 3.956 characters done in three phases of training. Testing image uses 552 characters of some images inputted in training phase and image which has not been used before. The test result achieve maximum accuracy of recognition system at 91.88% from train image and 31.03% from test image. © 2011 IEEE.

关键词： Backpropagation

来源：评论

学校读者我要写书评

暂无评论

Kick-off workshops and project retrospectives: A good learning software organization practice

引用

3rd Biennial Conference on Professional Knowledge Management, WM 2005

作者： Fajtak, Fred Frowin Siemens AG Österreich Program and System Engineering Werner von Siemens-Platz 1 A-5021 Salzburg Austria

ISBN: (纸本)3540304657

program and system engineering, in short PSE, is a division of Siemens AG Austria and one of Europe's largest software houses. Kick-off workshops and project retrospectives are an important instrument of PSE as a learning software organization. PSE supports this with a company wide network of facilitators, organized in the Support Center Project Experience. Kick-offs and retrospectives combined with a network of facilitators enable several learning loops in different organizational levels. © Springer-Verlag Berlin Heidelberg 2005.

关键词： Learning systems

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：