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Improved insensitive to input parameters trajectory clustering algorithm 认领 引用 被引量：3
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作者 Jiashun Chen Dechang Pi 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2013年第5期852-861,共10页
The existing trajectory clustering （TRACLUS） is sensitive to the input parameters c and MinLns. The parameter value is changed a little, but cluster results are entirely different. Aiming at this vulnerability, a sh... The existing trajectory clustering （TRACLUS） is sensitive to the input parameters c and MinLns. The parameter value is changed a little, but cluster results are entirely different. Aiming at this vulnerability, a shielding parameters sensitivity trajectory cluster （SPSTC） algorithm is proposed which is insensitive to the input parameters. Firstly, some definitions about the core distance and reachable distance of line segment are presented, and then the algorithm generates cluster sorting according to the core dis- tance and reachable distance. Secondly, the reachable plots of line segment sets are constructed according to the cluster sorting and reachable distance. Thirdly, a parameterized sequence is extracted according to the reachable plot, and then the final trajectory cluster based on the parameterized sequence is acquired. The parameterized sequence represents the inner cluster structure of trajectory data. Experiments on real data sets and test data sets show that the SPSTC algorithm effectively reduces the sensitivity to the input parameters, meanwhile it can obtain the better quality of the trajectory cluster. 展开更多
关键词 clustering trajectory sensitivity input parameter.
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Investigate Weld Quality of Gas Metal Arc Welding Process Through Online Monitoring of Input Parameters 认领 引用
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作者 Nishadi WEERASINGHE Banuka PANDITHASEKARA Dulaj THENNAKOON 《Instrumentation》 2021年第3期52-66,共15页
Gas metal arc welding(GMAW)is also referred as the metal inert gas(MIG)welding which is a process of welding done by the formation of an electric arc between the consumable wire electrode and the workpiece.Through the... Gas metal arc welding(GMAW)is also referred as the metal inert gas(MIG)welding which is a process of welding done by the formation of an electric arc between the consumable wire electrode and the workpiece.Through the welding process,a continuous flow of inert gas is supplied,and it avoids the weld being subjected to react with atmospheric air.The process can be automatic or semi-automatic where the main input parameters like current and the voltage can be direct and constant,respectively.Not only the current and voltage the welding quality depends on some more input parameters such as arc gap,velocity,and temperature.In this paper,we explain about a setup which is capable of real-time monitoring of input parameters mentioned above and selecting the best MIG welding parameters for the mild steel.The setup is composed of several sensors and microcontrollers for the collection and the measurement of the input parameters.The samples were categorized according to the federate and the voltage adjustment of the selected welding machine.Then the final objective was to identify the samples of the weld with different parameter changes which are monitored through the system.For the analysis,the samples were subjected to tensile and hardness tests,and microstructure tests to find the dependence of the input parameters which effect for the weld quality.Finally,the experimental results verified the effectiveness of the system for the selection of the quality weld. 展开更多
关键词 Real-time Metal Inert Gas(MIG) Gas Metal Arc Welding(GMAW) Input Parameters Monitoring Setup Weld Quality
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Nonsingular terminal sliding mode approach applied to synchronize chaotic systems with unknown parameters and nonlinear inputs 认领 引用 被引量：3
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作者 Mohammad Pourmahmood Aghababa Hassan Feizi 《Chinese Physics B》 SCIE EI CAS CSCD 2012年第6期107-116,共10页
This paper deals with the design of a novel nonsingular terminal sliding mode controller for finite-time synchro-nization of two different chaotic systems with fully unknown parameters and nonlinear inputs. We propose... This paper deals with the design of a novel nonsingular terminal sliding mode controller for finite-time synchro-nization of two different chaotic systems with fully unknown parameters and nonlinear inputs. We propose a novel nonsingular terminal sliding surface and prove its finite-time convergence to zero. We assume that both the master＇s and the slave＇s system parameters are unknown in advance. Proper adaptation laws are derived to tackle the unknown parameters. An adaptive sliding mode control law is designed to ensure the existence of the sliding mode in finite time. We prove that both reaching and sliding mode phases are stable in finite time. An estimation of convergence time is given. Two illustrative examples show the effectiveness and usefulness of the proposed technique. It is worthwhile noticing that the introduced nonsingular terminal sliding mode can be applied to a wide variety of nonlinear control problems. 展开更多
关键词 nonsingular terminal sliding mode finite-time synchronization uncertain parameter,nonlinear input
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Input torque sensitivity to uncertain parameters in biped robot 认领 引用 被引量：4
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作者 Chang-Tao Ding Shi-Xi Yang Chun-Biao Gan 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2013年第3期452-461,共10页
Input torque is the main power to maintain bipedal walking of robot, and can be calculated from trajectory planning and dynamic modeling on biped robot. During bipedal walking, the input torque is usually required to ... Input torque is the main power to maintain bipedal walking of robot, and can be calculated from trajectory planning and dynamic modeling on biped robot. During bipedal walking, the input torque is usually required to be adjusted due to some uncertain parameters arising from objective or subjective factors in the dynamical model to maintain the pre-planned stable trajectory. Here, a planar 5-link biped robot is used as an illustrating example to investigate the effects of uncertain parameters on the input torques. Kine-matic equations of the biped robot are firstly established by the third-order spline curves based on the trajectory planning method, and the dynamic modeling is accomplished by taking both the certain and uncertain parameters into account. Next, several evaluation indices on input torques are intro-duced to perform sensitivity analysis of the input torque with respect to the uncertain parameters. Finally, based on the Monte Carlo simulation, the values of evaluation indices on input torques are presented, from which all the robot param-eters are classified into three categories, i.e., strongly sensi-tive, sensitive and almost insensitive parameters. 展开更多
关键词 Biped robot · Uncertain parameter · Trajectory planning · Input torque · Sensitivity
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分布式水文模型在高原山地流域的研究与应用进展 认领 引用 被引量：2
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作者 敖天其 刘臻 +5 位作者 吴玲玲 卢泽华 郭立 李海潮 李红霞 周理 《高原山地气象研究》 2025年第3期14-23,共10页
高原山地流域受到垂直气候梯度与复杂下垫面条件的协同调控,其水文过程呈现显著的时空异质性特征,导致传统水文模型难以精准模拟和预测。分布式水文模型兼具网格空间离散化与产汇流过程物理机制约束等优势,可模拟气象-下垫面复杂互馈过... 高原山地流域受到垂直气候梯度与复杂下垫面条件的协同调控,其水文过程呈现显著的时空异质性特征,导致传统水文模型难以精准模拟和预测。分布式水文模型兼具网格空间离散化与产汇流过程物理机制约束等优势,可模拟气象-下垫面复杂互馈过程所驱动的水文过程,已在高原山地流域的径流过程等水文模拟、预报中得到广泛应用。本文首先综述了分布式水文模型在高原山地流域的应用进展:在模型结构层面,实现了冻土水热耦合、冰川动力过程等模块的改进与多过程集成;融合了多源遥感、再分析等网格产品与地面观测,显著提升了输入数据的精度和时空覆盖度;发展了参数区域化函数或参数转移函数及遥感观测约束的率定技术,由此提升缺资料高原山地流域的分布式水文模拟。其次,本文梳理了分布式水文模型在高原山地流域降雨径流模拟、冰川融雪过程模拟、土壤侵蚀评估及气候/土地利用的水文响应中的关键成果。同时发现,当前高原山地流域分布式水文模拟仍面临冰川动力学机制刻画不足、冻土-生态-水文耦合薄弱及高寒区参数不确定性较大等诸多挑战。最后,论文倡议后续研究需深化水-热-碳地表协同过程机理、发展机器学习辅助或基于下垫面物理特性的参数网格化自适应技术、构建多模型-多数据集成框架,以进一步提升高原山地流域复杂水文过程的模拟预报精度与时效性,为高原生态屏障功能维护与水安全战略提供科技支撑。 展开更多
关键词 分布式水文模型 高原山地流域 模型结构与参数值 输入数据 研究应用进展 挑战与展望
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Sensitivity Analysis of Thermal Properties on Numerical Simulation Results of Quenching Process 认领 引用 被引量：1
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作者 周志方 顾剑锋 +1 位作者 王晓燕 潘健生 《Journal of Shanghai Jiaotong university(Science)》 EI 2011年第6期759-762,共4页
A three-factor three-level orthogonal test project has been designed based on the numerical simulation of a Jominy quenching process.Then the data scattering effects of thermal conductivity and enthalpy of tested stee... A three-factor three-level orthogonal test project has been designed based on the numerical simulation of a Jominy quenching process.Then the data scattering effects of thermal conductivity and enthalpy of tested steel,as well as the heat exchange coefficients of the cooling media,on the results have been studied.The results can be used as a reference for choosing the input thermal parameter in finite element simulation of quenching,and for evaluating the simulation results. 展开更多
关键词 finite element simulation orthogonal test method thermal input parameters quenching
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基于输入轨迹参数化的间歇过程迭代学习控制 认领 引用 被引量：8
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作者 叶凌箭 马修水 宋执环 《化工学报》 EI CSCD 北大核心 2016年第3期743-750,共8页
针对间歇过程的迭代学习控制问题,提出了一种基于输入轨迹参数化的迭代学习控制策略。根据最优输入轨迹的主要形态特征,将其参数化为较少量的决策变量,降低传统迭代学习控制复杂性的同时维持良好的优化控制效果。基于输入轨迹参数化的... 针对间歇过程的迭代学习控制问题,提出了一种基于输入轨迹参数化的迭代学习控制策略。根据最优输入轨迹的主要形态特征,将其参数化为较少量的决策变量,降低传统迭代学习控制复杂性的同时维持良好的优化控制效果。基于输入轨迹参数化的迭代学习控制策略能保持算法的简洁性和易实现性,在不确定扰动影响下逐步改善产品质量。对一个间歇反应器的仿真研究验证了本文方法的有效性。 展开更多
关键词 间歇式 优化 化学过程 迭代学习控制 输入参数化
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多输入多输出微振动系统的混合鲁棒自适应控制 认领 引用 被引量：4
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作者 方昱斌 朱晓锦 +1 位作者 高志远 张小兵 《控制理论与应用》 EI CAS CSCD 北大核心 2024年第9期1559-1568,共10页
Q参数化方法在结构振动自适应控制领域的应用中体现出明显优势.本文针对多输入多输出(MIMO)结构振动主动控制系统,利用Q参数化方法的优势,基于无限冲激响应(IIR)滤波器,提出了一种结合前馈控制与反馈控制的MIMO混合鲁棒自适应控制方法.... Q参数化方法在结构振动自适应控制领域的应用中体现出明显优势.本文针对多输入多输出(MIMO)结构振动主动控制系统,利用Q参数化方法的优势,基于无限冲激响应(IIR)滤波器,提出了一种结合前馈控制与反馈控制的MIMO混合鲁棒自适应控制方法.同时,给出前馈,反馈MIMO鲁棒自适应控制方法的详细推导过程,给出混合MIMO鲁棒自适应控制方法的推导和稳定性,收敛性分析.在此基础上,通过构建三自由度微振动主动振动控制实验系统,针对单频窄带和双频窄带扰动展开了对比实验分析,相关的实验结果验证了本文所提出MIMO混合鲁棒自适应控制方法的可行性和有效性. 展开更多
关键词 混合自适应控制 多输入多输出 Q参数化 振动控制 鲁棒自适应
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输送机中间架智能语音交互设计型专家系统研究 认领 引用 被引量：2
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作者 宁志强 陶元芳 《煤炭工程》 北大核心 2018年第3期116-121,共6页
针对有限元分析过程的建模复杂的问题,提出一种智能语音交互的参数化有限元专家系统。通过对有限元分析过程的参数化、智能语音交互和知识重用的研究,描述了专家系统的功能和流程。将语音识别技术、专家系统技术、参数化设计与有限元分... 针对有限元分析过程的建模复杂的问题,提出一种智能语音交互的参数化有限元专家系统。通过对有限元分析过程的参数化、智能语音交互和知识重用的研究,描述了专家系统的功能和流程。将语音识别技术、专家系统技术、参数化设计与有限元分析相结合,通过人机语音对话实现定性设计和定量设计结合,并研究了有限元分析自动调整参数。研究了专家系统开发过程中的关键技术,主要涉及到方言智能语音交互的实现方法和基于案例的推理的参数化设计方法,并提出了改进的CLIPS和VC++交互方法。以带式输送机中间架结构分析为例,给出构建智能语音交互有限元专家系统的实现方法。有限元仿真结果表明,该方法减轻了有限元分析的工作量,提高了工作效率。 展开更多
关键词 专家系统 讯飞语音输入法 设计选型树 参数化有限元
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风能输入参数对珠江口波浪模拟的影响 认领 引用
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作者 李少钿 李毅能 +3 位作者 李骏旻 张志旭 刘春霞 彭世球 《热带气象学报》 CSCD 北大核心 2022年第4期541-553,共13页
珠江口是粤港澳大湾区的核心区域,台风、风暴潮和巨浪等海洋灾害频发,对沿岸人民的生命财产安全构成严重威胁。准确的高分辨率波浪模拟/预报对区域经济建设和防灾减灾具有重要意义。波浪预报/模拟的质量很大程度上取决于风能输入的误差... 珠江口是粤港澳大湾区的核心区域,台风、风暴潮和巨浪等海洋灾害频发,对沿岸人民的生命财产安全构成严重威胁。准确的高分辨率波浪模拟/预报对区域经济建设和防灾减灾具有重要意义。波浪预报/模拟的质量很大程度上取决于风能输入的误差。本研究基于WAVEWATCH III(WW3)的南海-珠江口双重嵌套精细化海浪模式,探讨不同的风场产品与风能输入参数方案组合对珠江口波浪动力过程模拟的影响,确定最优的风场和参数方案组合。ERA5风场更适合珠江口海域的风浪模拟,其模式结果略优于采用CFSR风场的模式结果。ERA5风场+T500方案的组合对珠江口波高变化过程的模拟效果最好,ERA5风场+T471方案的组合次之,ERA5风场+ST6方案再次之。CFSR风场与T471f参数方案最为适配,其结果稍差于ERA5风场+ST6参数方案。T500方案调整高风速下的风能输入和涌浪对风能输入的反馈作用,并考虑水深引起的波浪破碎效应,更适合水深限制的珠江口浅水区域。另外,WW3模式开关ST4的参数方案的表现优于开关ST6的参数方案。 展开更多
关键词 波浪 风能输入参数方案 珠江口 WAVEWATCHⅢ
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Mathematical Modeling of the Bulk Density Property of Knitted Fabrics 认领 引用
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作者 Iroda Ibrohimovna Kamalova Baxtiyor Farruxovich Mirusmanov +2 位作者 Juramirza Abdiramatovich Kayumov Axtam Akramovich Qosimov Muborak Nosir Qizi Yusupova 《Engineering（科研）》 2022年第1期33-42,共10页
The paper focuses on the prediction of the volumetric density property of knitting fabrics using mathematical modeling. Based on the graphical analysis of the obtained mathematical models, the results of the raw mater... The paper focuses on the prediction of the volumetric density property of knitting fabrics using mathematical modeling. Based on the graphical analysis of the obtained mathematical models, the results of the raw material properties for the futer knitted fabric on the values of alternative indicators are presented. 展开更多
关键词 Knitwear Futer Polyester Mathematical Model Input Parameter Output Parameter Regression Coefficient
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Evaluation of Parametric Limitations in Simulating Greenhouse Gas Fluxes from Irish Arable Soils Using Three Process-Based Models 认领 引用
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作者 Mohammad I. Khalil Mohamed Abdalla +2 位作者 Gary Lanigan Bruce Osborne Christoph Müller 《Agricultural Sciences》 2016年第8期503-520,共18页
Globally a large number of process-based models have been assessed for quantification of agricultural greenhouse gas (GHG) emissions. Modelling approaches minimize the presence of spatial variability of biogeochemical... Globally a large number of process-based models have been assessed for quantification of agricultural greenhouse gas (GHG) emissions. Modelling approaches minimize the presence of spatial variability of biogeochemical processes, leading to improved estimates of GHGs as well as identifying mitigation and policy options. The comparative performance of the three dynamic models (e.g., DNDC v9.4, DailyDayCent and ECOSSE v5+) with minimum numbers of common input parameters was evaluated against measured variables. Simulations were performed on conventionally-tilled spring barley crops receiving N fertilizer at 135 - 159 kg·N·ha-1·yr-1 and crop residues at 3 t·ha-1·yr-1. For surface soil nitrate (0 - 10 cm), the ECOSSE and DNDC simulated values showed significant correlations with measured values (R2 = 0.31 - 0.55, p 0.05). Only the ECOSSE-simulated N2O fluxes showed a significant relationship (R2 = 0.33, p 0.05) with values measured from fertilized fields, but not with unfertilized ones. The DNDC and DailyDayCent models significantly underestimated seasonal/annual N2O fluxes compared to ECOSSE, with emission factors (EFs), based on an 8-year average, were 0.09%, 0.31% and 0.52%, respectively. Predictions of ecosystem respiration by both DailyDayCent and DNDC showed reasonable agreement with Eddy Covariance data (R2 = 0.34 - 0.41, p 0.05). Compared to the measured value (3624 kg·C·ha-1·yr-1), the ECOSSE underestimated annual heterotrophic respiration by 7% but this was smaller than the DNDC (50%) and DailyDayCent (24%) estimates. All models simulated CH4 uptake we 展开更多
关键词 Greenhouse Gases Arable Lands Input Parameters Process-Based Models Ireland
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Effects of coefficient of friction and coefficient of restitution on static packing characteristics of polydisperse spherical pebble bed 认领 引用 被引量：2
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作者 Jian Wang Mingzhun Lei +4 位作者 Hao Yang Kun Xu Shuling Xu Pinghui Zhao Yuntao Song 《Particuology》 SCIE EI CAS CSCD 2021年第4期1-9,共9页
The effects of the coefficient of friction and coefficient of restitution on the static packing characteristics of a polydisperse spherical pebble bed are numerically investigated using the discrete element method.Sev... The effects of the coefficient of friction and coefficient of restitution on the static packing characteristics of a polydisperse spherical pebble bed are numerically investigated using the discrete element method.Several important static packing characteristics under different coefficients of friction and restitution are presented and discussed.The results show that the coefficients of friction and restitution impose opposite effects on the packing heights and global packing factor.Neither the coefficient of friction nor restitution affected the oscillation width of the wall,whereas their effects are primarily reflected in the oscillation amplitude of the radial local packing factor and the axial local packing factor distribution at the top of the pebble bed.In both the contact force distribution and coordination number distribution,a left-shifted phenomenon appearing as the coefficient of friction occurred,and only the magnitude of the maximum frequency is affected when the coefficient of restitution changed from 0.1 to 0.9.In all simulation cases,the effects of the coefficients of friction and restitution are similar to that of cross-impact. 展开更多
关键词 Static characteristic Discrete element method Input parameter Polydisperse pebble bed Ceramic pebble
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