Modeling, Identification and Control: A Norwegian Research Bulletin最新文献

Residual vibration control for robotic 3D scanning with application to inspection of marine propellers 机器人三维扫描残余振动控制及其在舰船螺旋桨检测中的应用

Modeling, Identification and Control: A Norwegian Research Bulletin Pub Date : 2021-01-04 DOI: 10.4173/mic.2021.2.3

E. B. Njaastad, G. O. Tysse, O. Egeland

引用次数: 0

An Open-Source Python-Based Boundary-Element Method Code for the Three-Dimensional, Zero-Froude, Infinite-Depth, Water-Wave Diffraction-Radiation Problem 一个开源的基于python的边界元方法代码的三维，零弗劳德，无限深度，水波衍射辐射问题

Modeling, Identification and Control: A Norwegian Research Bulletin Pub Date : 2021-01-04 DOI: 10.4173/mic.2021.2.2

Savin Viswanathan, C. Holden, O. Egeland, M. Greco

{"title":"An Open-Source Python-Based Boundary-Element Method Code for the Three-Dimensional, Zero-Froude, Infinite-Depth, Water-Wave Diffraction-Radiation Problem","authors":"Savin Viswanathan, C. Holden, O. Egeland, M. Greco","doi":"10.4173/mic.2021.2.2","DOIUrl":"https://doi.org/10.4173/mic.2021.2.2","url":null,"abstract":"In this paper, a new open-source implementation of the lower-order, 3-D Boundary Element Method (BEM) of solution to the deep-water, zero Froude-number wave-body interaction problem is described. A validation case for OMHyD, the new open-source package, is included, where the outputs are compared to results obtained using the widely used frequency-domain hydrodynamic analysis package ANSYS-AQWA. The theory behind the solution to the diﬀraction-radiation problem is re-visited using the Green function method. The Hess and Smith panel method is then extended to the case of a ﬂoating object using the image-source to impose the wall condition at the free-surface, and a wavy Green function component to account for presence of free-surface waves. An algorithm for computer implementation of the procedure is developed and subsequently implemented in PYTHON. The wavy part of the Green function is determined using a veriﬁed and published FORTRAN code by Teleste and Noblesse, wrapped for PYTHON using the Fortran to Python (F2PY) interface. Results are presented for the various stages of implementation viz. panelling, body in inﬁnite ﬂuid domain, eﬀect of the free-surface, and eﬀect of surface-waves. The hydrodynamic coeﬃcients obtained from this preliminary frequency-domain analysis are shown to be in satisfactory agreement with ANSYS-AQWA results. Conclusions are drawn based on the performance of the code, followed by suggestions for further improvement by including the removal of irregular-frequencies, multi-body interactions, and bottom interference, which are not considered in the present implementation.","PeriodicalId":313147,"journal":{"name":"Modeling, Identification and Control: A Norwegian Research Bulletin","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133849888","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Review on Modeling and Control of Flexible Link Manipulators 柔性连杆机械臂建模与控制研究进展

Modeling, Identification and Control: A Norwegian Research Bulletin Pub Date : 2020-01-07 DOI: 10.4173/mic.2020.3.2

Dipendra Subedi, I. Tyapin, G. Hovland

引用次数: 15

Steady State Counterbalance Valve Modeling with the Influence of Synthetic Ester Oils Using CFD 考虑合成酯油影响的稳态平衡阀CFD建模

Modeling, Identification and Control: A Norwegian Research Bulletin Pub Date : 2020-01-04 DOI: 10.4173/mic.2020.2.2

J. Jakobsen, M. Hansen

{"title":"Steady State Counterbalance Valve Modeling with the Influence of Synthetic Ester Oils Using CFD","authors":"J. Jakobsen, M. Hansen","doi":"10.4173/mic.2020.2.2","DOIUrl":"https://doi.org/10.4173/mic.2020.2.2","url":null,"abstract":"This study looks in details at the eﬀects of synthetic esters being applied to a counterbalance valve from the perspective of a system engineer. There is limited literature on the subject of applied synthetic esters and as such limited unbiased sources for information. This creates reluctance against the use of these ﬂuids in sectors and regions with no prior experience and knowledge of what to expect. This study expands the applied literature by investigating a commercially available valve using commercial oils, a basic synthetic ester, a fully saturated synthetic ester and a typical mineral oil type for benchmarking. The investigation is based on both computational ﬂuid dynamics and experiments and is performed at 20, 40 and 60 ◦ C. The product is a steady-state valve model including ﬂuid dynamics and a parameter-dependent Coulomb friction. The CFD model reveals minimal oil type dependence in the resulting ﬂuid dynamics model with ﬂow forces and discharge coeﬃcient being the same for mineral oil and esters. The experiments show that the esters primarily produce diﬀerent levels of hysteresis with up to 40% less and 15% more hysteresis. The friction investigation showed that the relationship between hysteresis and pilot pressure was diﬀerent for all oil types, and that the relationship between hysteresis and temperature was similar for all oil types. With full knowledge of mineral oil and the oil speciﬁc knowledge of the hysteresis and pilot pressure relationship at a single temperature, ester hysteresis was predicted with better than 88% accuracy across the three temperatures.","PeriodicalId":313147,"journal":{"name":"Modeling, Identification and Control: A Norwegian Research Bulletin","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129417448","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dynamic model for simulating transient behaviour of rotary drum granulation loop 转鼓造粒回路瞬态特性模拟的动态模型

Modeling, Identification and Control: A Norwegian Research Bulletin Pub Date : 2020-01-04 DOI: 10.4173/mic.2020.2.3

Ludmila Vesjolaja, B. Glemmestad, B. Lie

引用次数: 3

Estimating uncertainty of model parameters obtained using numerical optimisation 利用数值优化方法估计模型参数的不确定性

Modeling, Identification and Control: A Norwegian Research Bulletin Pub Date : 2019-01-10 DOI: 10.4173/mic.2019.4.3

O. M. Brastein, B. Lie, C. Pfeiffer, Nils-Olav Skeie

{"title":"Estimating uncertainty of model parameters obtained using numerical optimisation","authors":"O. M. Brastein, B. Lie, C. Pfeiffer, Nils-Olav Skeie","doi":"10.4173/mic.2019.4.3","DOIUrl":"https://doi.org/10.4173/mic.2019.4.3","url":null,"abstract":"Obtaining accurate models that can predict the behaviour of dynamic systems is important for a variety of applications. Often, models contain parameters that are difficult to calculate from system descriptions. Hence, parameter estimation methods are important tools for creating dynamic system models. Almost all dynamic system models contain uncertainty, either epistemic, due to simplifications in the model, or aleatoric, due to inherent randomness in physical effects such as measurement noise. Hence, obtaining an estimate for the uncertainty of the estimated parameters, typically in the form of confidence limits, is an important part of any statistically solid estimation procedure. Some uncertainty estimation methods can also be used to analyse the practical and structural identifiability of the parameters, as well as parameter inter-dependency and the presence of local minima in the objective function. In this paper, selected methods for estimation and analysis of parameters are reviewed. The methods are compared and demonstrated on the basis of both simulated and real world calibration data for two different case models. Recommendations are given for what applications each of the methods are suitable for. Further, differences in requirements for system excitation are discussed for each of the methods. Finally, a novel adaption of the Profile Likelihood method applied to a moving window is used to test the consistency of dynamic information in the calibration data for a particular model structure.","PeriodicalId":313147,"journal":{"name":"Modeling, Identification and Control: A Norwegian Research Bulletin","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133420150","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Payload estimation using forcemyography sensors for control of upper-body exoskeleton in load carrying assistance 利用力图传感器对上肢外骨骼进行载荷估计

Modeling, Identification and Control: A Norwegian Research Bulletin Pub Date : 2019-01-10 DOI: 10.4173/mic.2019.4.1

M. R. U. Islam, S. Bai

引用次数: 22

Model-Free PI/PID Controller Tuning of Higher Order Nonlinear Dynamic Systems 高阶非线性动态系统的无模型PI/PID控制器整定

Modeling, Identification and Control: A Norwegian Research Bulletin Pub Date : 2019-01-10 DOI: 10.4173/mic.2019.4.2

Christer Dalen, D. D. Ruscio

引用次数: 0

Dynamic model adaptation to an anaerobic digestion reactor of a water resource recovery facility 水资源回收装置厌氧消化反应器的动态模型适应

Modeling, Identification and Control: A Norwegian Research Bulletin Pub Date : 2019-01-07 DOI: 10.4173/mic.2019.3.2

S. Attar, F. Haugen

引用次数: 5

Nonlinear observer for hydropower system 水电系统非线性观测器

Modeling, Identification and Control: A Norwegian Research Bulletin Pub Date : 2019-01-07 DOI: 10.4173/mic.2019.3.1

Liubomyr Vytvytskyi, Roshan Sharma, B. Lie

引用次数: 0