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Discrete time transfer matrix method for dynamics of multibody system with flexible beams moving in space 被引量:4
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作者 Xiao-Ting Rui Edwin Kreuzer +1 位作者 Bao Rong Bin He 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2012年第2期490-504,共15页
In this paper, by defining new state vectors and developing new transfer matrices of various elements mov- ing in space, the discrete time transfer matrix method of multi-rigid-flexible-body system is expanded to stud... In this paper, by defining new state vectors and developing new transfer matrices of various elements mov- ing in space, the discrete time transfer matrix method of multi-rigid-flexible-body system is expanded to study the dynamics of multibody system with flexible beams moving in space. Formulations and numerical example of a rigid- flexible-body three pendulums system moving in space are given to validate the method. Using the new method to study the dynamics of multi-rigid-flexible-body system mov- ing in space, the global dynamics equations of system are not needed, the orders of involved matrices of the system are very low and the computational speed is high, irrespec- tive of the size of the system. The new method is simple, straightforward, practical, and provides a powerful tool for multi-rigid-flexible-body system dynamics. 展开更多
关键词 Multi-rigid-flexible-body system Spatial mo- tion DYNAMICS Discrete time transfer matrix method
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面向新型电力系统的储能规划方法研究进展及展望 被引量:1
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作者 唐西胜 李伟 沈晓东 《电力系统自动化》 EI CSCD 北大核心 2024年第9期178-191,共14页
储能是新型电力系统非常重要的灵活性调节资源,在源网荷各端均可发挥重要的作用,在中国,储能的发展已经进入规模化发展期,如何合理、经济地利用好储能的关键是规划配置方法。在对储能规划方法研究现状的基础上,分析了储能投资运营主体... 储能是新型电力系统非常重要的灵活性调节资源,在源网荷各端均可发挥重要的作用,在中国,储能的发展已经进入规模化发展期,如何合理、经济地利用好储能的关键是规划配置方法。在对储能规划方法研究现状的基础上,分析了储能投资运营主体多元化、应用场景和运行模式复杂化、储能技术多样化等新变化对储能规划方法的影响;提出了新能源聚集区考虑时空互补和共享机制的储能规划方法、电网侧充分市场竞争下的储能与输配电系统协同规划方法,以及用户侧电、热、氢多元储能合作/竞争共存下的规划方法。面向新型电力系统的储能规划,未来应注重电力系统不同发展阶段的整体协调性、储能投资运营主体多元化内生博弈机制的影响,以及规划方案在多目标多场景下的迁移学习方法。 展开更多
关键词 储能 规划方法 新型电力系统 共享储能 博弈机制 迁移学习
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Eigenvalue analysis of planar linear multibody system under conservative force based on the transfer matrix method 被引量:1
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作者 Jinghong Wang Xiaoting Rui +3 位作者 Xun Wang Jianshu Zhang Qinbo Zhou Junjie Gu 《International Journal of Mechanical System Dynamics》 2023年第1期12-24,共13页
The linear multibody system transfer matrix method(LMSTMM)provides a powerful tool for analyzing the vibration characteristics of a mechanical system.However,the original LMSTMM cannot resolve the eigenvalues of the s... The linear multibody system transfer matrix method(LMSTMM)provides a powerful tool for analyzing the vibration characteristics of a mechanical system.However,the original LMSTMM cannot resolve the eigenvalues of the systems with ideal hinges(i.e.,revolute hinge,sliding hinge,spherical hinge,cylindrical hinge,etc.)or bodies under conservative forces due to the lack of the corresponding transfer matrices.This paper enables the LMSTMM to solve the eigenvalues of the planar multibody systems with ideal hinges or rigid bodies under conservative forces.For a rigid body,the transfer matrix can now consider coupling terms between forces and kinematic state perturbations.Also,conservative forces that contribute to the eigenvalues can be considered.Meanwhile,ideal hinges are introduced to LMSTMM,which enables the treatment of eigenvalues of general multibody systems using LMSTMM.Finally,the comparative analysis with ADAMS software and analytical solutions verifies the effectiveness of the proposed approach in this paper. 展开更多
关键词 conservative forces eigenvalue analysis ideal hinges modal transformation multibody system transfer matrix method state perturbation
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The Experimental and Theoretical Research of "Local Resonance" in Ultrasonic Honing System 被引量:1
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作者 ZHU Xun-sheng, XU Ke-wei, ZHAO Bo, MA Deng-zhe (Mechanical School of Shanghai Jiaotong University, Shanghai 200030, China) 《厦门大学学报(自然科学版)》 CAS CSCD 北大核心 2002年第S1期49-,共1页
In 1982, Professor Fang Guoliang found the "Non full resonance" phenomenon in a tool system while he use the thin-long tool ultrasonically machining deep-small hole. He called it as "local resonance&quo... In 1982, Professor Fang Guoliang found the "Non full resonance" phenomenon in a tool system while he use the thin-long tool ultrasonically machining deep-small hole. He called it as "local resonance". Also this "Non full resonance" phenomenon was discovered in the ultrasonic drilling and the ultrasonic honing system later. To its mechanism, professor Fang thought that the coupling of long-thin tool bar and driving system is weak, so the tool bar can vibrate independently, but the quantitative relation between the coupling factor and diameter ratio is not made certain. Then several theories come forth to interpret it but still haven’t a common conclusion. Through the systematic experimental and theoretical research, this paper reveals that the "local resonance" phenomenon of ultrasonic honing system has the same essence with the "local resonance" phenomenon in deep hole machining system: when the section area ratio of tool bar and driving system is small enough, some resonance frequencies of combined system are close to the resonance frequencies of "fixed-free" state tool bar, the combined system is still resonant. According to the given depth of hole and structure size, we can use the transfer matrix deduced in this paper to design flexible bar and oilstone seat not only satisfying mechanical structure size but also achieving enough magnitude. It greatly simplified the design. This new method can be named as "local resonance" design method for ultrasonic honing system. The experiment, deduction and design method have a certain common meaning to the study and design of other ultrasonic system. 展开更多
关键词 local resonance ultrasonic honing system full resonance transfer matrix method
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DYNAMIC CHARACTERISTICS ON PRECISION NC LATHE BASED ON MULTI-BODY SYSTEM THEORY
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作者 Wu Nanxing Sun Qinghong +1 位作者 Zhang Yonghong Yu Dongling 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2005年第4期566-570,共5页
Based on multi-body system theory and the mainshafl system of precision NC lathe as object investigated, it is treated as a coupled rigid-flexible multi-body system which is made up of some rigid and elastic bodies in... Based on multi-body system theory and the mainshafl system of precision NC lathe as object investigated, it is treated as a coupled rigid-flexible multi-body system which is made up of some rigid and elastic bodies in an especial linking mode. And a dynamic model is established, The problems of computing vibration characteristics are resolved by using multi-body system transfer matrix method, Resutts show that the mainshaft system of NC lathe is in the stable and reliable working area all the time. The method is simple and easy, the idea is clear. In addition, the method can be easily used and popularized in the other multi-body system. 展开更多
关键词 Multi-body system Mainshaft system transfer matrix method Dynamic characteristics NC lathe
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Ballistic Trajectory Extrapolation and Correction of Firing Precision for Multiple Launch Rocket System
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作者 ZHA Qicheng RUI Xiaoting +1 位作者 WANG Guoping YU Hailong 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI CSCD 2019年第2期232-241,共10页
The research on multiple launch rocket system(MLRS)is now even more demanding in terms of reducing the time for dynamic calculations and improving the firing accuracy,keeping the cost as low as possible.This study emp... The research on multiple launch rocket system(MLRS)is now even more demanding in terms of reducing the time for dynamic calculations and improving the firing accuracy,keeping the cost as low as possible.This study employs multibody system transfer matrix method(MSTMM),to model MLRS.The use of this method provides effective and fast calculations of dynamic characteristics,initial disturbance and firing accuracy.Further,a new method of rapid extrapolation of ballistic trajectory of MLRS is proposed by using the position information of radar tests.That extrapolation point is then simulated and compared with the actual results,which demonstrates a good agreement.The closed?loop fire correction method is used to improve the firing accuracy of MLRS at low cost. 展开更多
关键词 multi-body system transfer matrix method(MSTMM) multiple launch ROCKET system(MLRS) dynamic modeling BALLISTIC trajectory EXTRAPOLATION fire CORRECTION method
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Dynamic model and simulation of aseismatic system about laser gyro strapdown inertial measure assembly based on MSTMM 被引量:1
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作者 Tong Zhang Jun Zhang Junjie Hu 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2012年第5期741-751,共11页
The precision of the laser gyro used in tactical missiles is poor because of dithering frequency,actuating by vibration,shock and overload in dynamical environment.This paper introduces the transfer matrix method of t... The precision of the laser gyro used in tactical missiles is poor because of dithering frequency,actuating by vibration,shock and overload in dynamical environment.This paper introduces the transfer matrix method of the multibody system(MSTMM),establishes the dynamic model of the laser gyro strapdown inertial measure assembly aseismatic system,and analyzes the precision affected by dithering of the laser gyro and shocking of the tactical missile.And the dynamic response of the laser gyro strapdown inertial measure assembly aseismatic system is obtained by simulating the multibody system model.The simulation result indicates a theoretical idea to design the vibration isolation for the laser gyro strapdown inertial measure assembly. 展开更多
关键词 transfer matrix method DYNAMICS laser gyro vibration reduction multibody system
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PERIODIC HEAT TRANSFER IN THE FINS WITH VARIABLE THERMAL PARAMETERS
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作者 杨翔翔 何宏舟 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 1996年第2期169-180,共12页
The problem of one dimensional, nonstationary heat transfer was solved by the method of small parameter perturbation, thus, the partial differential equation was reduced to a system of ordinary differential equations.... The problem of one dimensional, nonstationary heat transfer was solved by the method of small parameter perturbation, thus, the partial differential equation was reduced to a system of ordinary differential equations. Then, the numerical method, i.e. the shooting method and superposition method was used to solve the system of ordinary differential equations. Finally, the influences of some parameters on temperature distribution, heat flux and fin efficiency were discussed. In addition to theoretical significance, the results are of practical significance for engineering design. 展开更多
关键词 Heat transfer Numerical methods Perturbation techniques Time varying systems
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中深层地埋管热泵系统运行性能测试平台及方法研究 被引量:1
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作者 邓杰文 王成 +8 位作者 李科 李敏 张威 刘立军 段毅 赵兴海 周添 刘加根 魏庆芃 《暖通空调》 2023年第11期35-42,共8页
中深层地埋管热泵供热系统的运行性能受地热地质条件影响显著。本文针对新建项目缺乏地热地质资料的情况,提出了该技术的现场测试平台及方法,在建设初期即可明确实际应用效果。将该方法应用于我国寒冷地区某新建项目,实测结果表明,1根埋... 中深层地埋管热泵供热系统的运行性能受地热地质条件影响显著。本文针对新建项目缺乏地热地质资料的情况,提出了该技术的现场测试平台及方法,在建设初期即可明确实际应用效果。将该方法应用于我国寒冷地区某新建项目,实测结果表明,1根埋深2750 m的中深层地埋管连续运行尖峰取热能力达到450 kW,热泵机组尖峰供热能力达到600 kW。对中深层地埋管取热特性、热泵系统运行特性开展了变工况测试研究,可为项目规划设计及技术的推广应用提供数据支撑。 展开更多
关键词 中深层地埋管 热泵系统 测试平台 测试方法 运行性能 换热性能
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电磁轨道炮导轨身管系统动力学分析
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作者 江镇宇 于海龙 +1 位作者 何斌 靳展 《弹道学报》 CSCD 北大核心 2023年第3期47-54,77,共9页
针对电磁轨道炮等新概念电磁发射系统发射动力学建模复杂、计算成本高等难题,考虑上下导轨非对称性影响,将上下导轨视为横向振动梁,身管视为在特定位置作用两弹性支撑的横向振动梁,导轨与身管间的相互作用视为连续分布弹簧,建立导轨身... 针对电磁轨道炮等新概念电磁发射系统发射动力学建模复杂、计算成本高等难题,考虑上下导轨非对称性影响,将上下导轨视为横向振动梁,身管视为在特定位置作用两弹性支撑的横向振动梁,导轨与身管间的相互作用视为连续分布弹簧,建立导轨身管系统三梁动力学模型。利用多体系统传递矩阵法推导系统各部分传递矩阵,组装系统总传递方程,求解系统任意位置在对应频率下的状态矢量。通过毕奥-萨伐尔定律解算导轨间及枢轨间的电磁力作用系数,分析导轨所受电磁力分布规律。利用模态叠加法求解系统静位移和在重力及时变电磁力作用下的动态响应,并与商业有限元软件计算结果比较,验证该方法的有效性和快速性。分析发现当电流较小时,系统在静变形位置附近波动,电流达到峰值平台后,上下导轨间距在“扩张-收缩”的过程中反复震荡;上导轨由于弹性支撑参数等非对称性因素的影响变形量更大,为电磁轨道炮耦合系统动力学分析提供理论支撑。 展开更多
关键词 电磁轨道炮 导轨身管系统 多体系统传递矩阵法 振动特性 动态响应
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跨领域知识体系迁移——网状结构的呼应设计范式
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作者 申超群 蒋涛 +3 位作者 尹亚林 宰小芬 张守辉 李照慧 《河南科技》 2023年第7期154-157,共4页
【目的】通过研究基于多个相关领域知识体系和知识图谱,融合区块链技术理念,分析离散知识元素,可视化知识关系,进而区块化知识元素和链化知识关系,完成已有知识体系的解构和区块链化,并赋予和强化其泛化能力。【方法】结合人工智能不确... 【目的】通过研究基于多个相关领域知识体系和知识图谱,融合区块链技术理念,分析离散知识元素,可视化知识关系,进而区块化知识元素和链化知识关系,完成已有知识体系的解构和区块链化,并赋予和强化其泛化能力。【方法】结合人工智能不确定性理念和TRIZ等技术方法,将泛化能力更强的知识体系与新领域边界条件、场景特征和需求要素等深度动态融合,进而使原知识体系转化为新领域的知识要素和关系,并判断其转化效果,进行反馈和迭代,最终完成新领域知识体系构建。【结果】通过对原知识体系的解构、重塑、泛化和强化,与新领域需求相结合,跨领域知识体系迁移(解构、重构),构建适应新领域的知识体系,最终形成具有极其显著特征和广阔延展前景的网状结构的呼应设计(networkechodesign,简称NED或称蛙鸣设计)范式。【结论】为区块链技术在实体产业中的应用找到突破口,进而促进形成新的产业区块链思维,是一种能深度动态融合、有效互助互联多种前沿技术的开源的突破创新技术。 展开更多
关键词 知识迁移 创世区块 共鸣方法 网状设计体系范式
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Multibody system transfer matrix method:The past, the present, and the future 被引量:13
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作者 Xiaoting Rui Jianshu Zhang +3 位作者 Xun Wang Bao Rong Bin He Zhan Jin 《International Journal of Mechanical System Dynamics》 2022年第1期3-26,共24页
The multibody system transfer matrix method(MSTMM),a novel dynamics approach developed during the past three decades,has several advantages compared to conventional dynamics methods.Some of these advantages include av... The multibody system transfer matrix method(MSTMM),a novel dynamics approach developed during the past three decades,has several advantages compared to conventional dynamics methods.Some of these advantages include avoiding global dynamics equations with a system inertia matrix,utilizing low‐order matrices independent of system degree of freedom,high computational speed,and simplicity of computer implementation.MSTMM has been widely used in computer modeling,simulations,and performance evaluation of approximately 150 different complex mechanical systems.In this paper,the following aspects regarding MSTMM are reviewed:basic theory,algorithms,simulation and design software,and applications.Future research directions and generalization to more applications in various fields of science,technology,and engineering are discussed. 展开更多
关键词 multibody system dynamics multibody system transfer matrix method transfer matrix transfer equation automatic assembly theorem reduced multibody system transfer matrix method theory SOFTWARE applications acoustic system electrical power system fluid system
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Transfer matrix method for multibody systems(Rui method) and its applications 被引量:14
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作者 RUI XiaoTing WANG Xun +1 位作者 ZHOU QinBo ZHANG JianShu 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2019年第5期712-720,共9页
The transfer matrix method for multibody systems, namely the "Rui method", is a new method for studying multibody system dynamics, which avoids the global dynamics equations of the system, keeps high computa... The transfer matrix method for multibody systems, namely the "Rui method", is a new method for studying multibody system dynamics, which avoids the global dynamics equations of the system, keeps high computational speed, and allows highly formalized programming. It has been widely applied to scientific research and key engineering of lots of complex mechanical systems in 52 research directions. The following aspects regarding the transfer matrix method for multibody systems are reviewed systematically in this paper: history, basic principles, formulas, algorithm, automatic deduction theorem of overall transfer equation, visualized simulation and design software, highlights, tendency, and applications in 52 research directions in over 100 key engineering products. 展开更多
关键词 MULTIBODY system dynamics transfer matrix method for MULTIBODY systems Rui method automatic DEDUCTION THEOREM of overall transfer equation theory computation software APPLICATIONS
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考虑信号传递路径的行星齿轮传动太阳轮裂纹故障响应分析
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作者 姚俊 章翔峰 +3 位作者 周建星 谢高敏 王烨锋 解开泰 《振动工程学报》 EI CSCD 北大核心 2023年第6期1714-1722,共9页
为研究振动信号传递路径对行星齿轮传动系统太阳轮裂纹故障响应的影响,采用有限元法建立齿圈结构动力学分析模型,对比分析了考虑与未考虑传递路径的齿圈振动响应,验证了模型中传递路径的时变效应以及模型的有效性。开展了太阳轮裂纹故... 为研究振动信号传递路径对行星齿轮传动系统太阳轮裂纹故障响应的影响,采用有限元法建立齿圈结构动力学分析模型,对比分析了考虑与未考虑传递路径的齿圈振动响应,验证了模型中传递路径的时变效应以及模型的有效性。开展了太阳轮裂纹故障试验,采用快速谱峭度法(Fast Spectral Kurtosis,FSK)对实验信号进行降噪以及故障特征提取,验证了太阳轮裂纹故障仿真结果的准确性。结果表明:仅考虑与太阳轮故障齿啮合的行星轮的传递信号时,故障信号在路径中的传递随距离增加呈现不断衰减趋势;当考虑所有行星轮的传递信号时,故障信号出现调制现象,随传递距离增加呈现衰减或增加趋势。 展开更多
关键词 行星齿轮传动系统 齿裂纹 传递路径 快速谱峭度法
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精密镗床主轴系统温度场与热误差解析建模
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作者 王孟超 杨军 +1 位作者 张鑫 潘阳凡 《内蒙古工业大学学报(自然科学版)》 2023年第5期445-453,共9页
为了准确真实地建立反映主轴瞬态温度场与热误差变化的物理解析模型,提出了一种考虑辐射换热以及轴承瞬态生热的主轴热网络模型,分析主轴系统的轴承热-结构相互作用机理及其对生热率的影响,计算了轴承的时变生热率;分析讨论辐射换热对... 为了准确真实地建立反映主轴瞬态温度场与热误差变化的物理解析模型,提出了一种考虑辐射换热以及轴承瞬态生热的主轴热网络模型,分析主轴系统的轴承热-结构相互作用机理及其对生热率的影响,计算了轴承的时变生热率;分析讨论辐射换热对主轴系统温度场与热误差的影响,基于辐射网络提出了主轴系统以辐射换热方式耗散热量的计算方式;提出将辐射换热引入热网络模型的计算方法,建立更完善的主轴温度场与热误差解析模型。为了验证该模型的准确性和泛化能力,进行了不同转速、不同环境温度及不同初始结构温度下主轴系统的热特性实验,结果表明,辐射换热对于主轴温度场与热误差的影响不可忽略,考虑辐射换热的物理解析模型精度更高。 展开更多
关键词 温度场解析建模 热误差解析建模 主轴系统 辐射换热 热网络法
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高速飞行器燃油瞬态温度预测的修正热网络法
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作者 程显达 郑皓冉 +1 位作者 杨学森 董威 《上海交通大学学报》 EI CAS CSCD 北大核心 2023年第6期728-738,共11页
针对高速飞行器燃油消耗全阶段温度场三维瞬态计算存在效率过低问题,为满足高速飞行器燃料系统快速迭代设计过程中燃油温度场计算的需求,通过在热传导方程中添加掺混系数表征燃油内部热对流,在热平衡方程中添加传质项表征燃油宏观流动,... 针对高速飞行器燃油消耗全阶段温度场三维瞬态计算存在效率过低问题,为满足高速飞行器燃料系统快速迭代设计过程中燃油温度场计算的需求,通过在热传导方程中添加掺混系数表征燃油内部热对流,在热平衡方程中添加传质项表征燃油宏观流动,提出一种满足设计精度的高效修正热网络方法.基于提出的热网络法构建高速飞行器储油系统瞬态热分析模型,在不同的热边界条件和储油系统几何结构下,该热网络法计算结果与计算流体动力学(CFD)方法结果的偏差低于5%,计算效率极大提高.采用CFD计算与修正热网络法结合的方式,为高速飞行器燃料储存系统设计提供了新的燃油瞬态温度变化预测方法. 展开更多
关键词 高速飞行器燃油系统 瞬态温度预测 修正热网络法 传热
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GIS设备内SF6气体泄漏检测技术创新研究 被引量:5
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作者 田忠 常敏 +1 位作者 金海勇 贺兵 《粘接》 CAS 2023年第1期192-196,共5页
现有技术中的变电站GIS设备内SF6气体泄漏浓度较大,检测精度较低。试验设计了TMS+XD芯片提高巡视机器人性能,采用离子迁移法设计SF6检测技术,利用扫描窗口提供的SF6浓度分析离子波谱,可精准地判断气体泄漏规律;采用差分能量检测(DED)算... 现有技术中的变电站GIS设备内SF6气体泄漏浓度较大,检测精度较低。试验设计了TMS+XD芯片提高巡视机器人性能,采用离子迁移法设计SF6检测技术,利用扫描窗口提供的SF6浓度分析离子波谱,可精准地判断气体泄漏规律;采用差分能量检测(DED)算法和概率学公式掌握SF6气体泄漏浓度,进而制定出最佳填充范围,增加变电站GIS设备的安全性。试验结果表明:研究检测系统输出的SF6泄漏浓度为15.8 mol/mL,检测精度为92.5%,SF6气体泄漏浓度少,检测精度高。 展开更多
关键词 SF6气体泄漏 检测 TMS+XD联合芯片 离子迁移法 DED算法
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Vector radiative transfer numerical model of coupled ocean-atmosphere system using matrix-operator method 被引量:5
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作者 HE XianQiang PAN DeLu +2 位作者 BAI Yan ZHU QianKun GONG Fang 《Science China Earth Sciences》 SCIE EI CAS 2007年第3期442-452,共11页
A vector radiative transfer numerical model of the coupled ocean-atmosphere system is developed based on the matrix-operator method, which is named PCOART. Using the Fourier analysis, the vector radiative transfer equ... A vector radiative transfer numerical model of the coupled ocean-atmosphere system is developed based on the matrix-operator method, which is named PCOART. Using the Fourier analysis, the vector radiative transfer equation (VRTE) is separated into a set of equations depending only on the observa-tion zenith angle. Using the Gaussian-Quadrature method, VRTE is finally transferred into the matrix equation solved by the adding-doubling method. According to the reflective and refractive properties of the ocean-atmosphere interface, the vector radiative transfer numerical model of the ocean and at-mosphere is coupled in PCOART. Compared with the exact Rayleigh scattering look-up tables of MODIS (Moderate-resolution Imaging Spectroradiometer), it is shown that PCOART is an exactly numerical model, and the processing methods of the multi-scattering and polarization are correct. Also, validated with the standard problems of the radiative transfer in water, it is shown that PCOART can be used to calculate the underwater radiative transfer problems. Therefore, PCOART is a useful tool for exactly calculating the vector radiative transfer of the coupled ocean-atmosphere system, which can be used to study the polarization properties of the radiance in the whole ocean-atmosphere system and the remote sensing of the atmosphere and ocean. 展开更多
关键词 VECTOR radiative transfer NUMERICAL model COUPLED OCEAN-ATMOSPHERE system matrix-operator method adding-doubling method polarization remote sensing
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知识和数据驱动的多时间尺度采样系统建模方法
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作者 刘洪旭 韩红桂 杨洪燕 《北京工业大学学报》 CAS CSCD 北大核心 2023年第4期395-402,共8页
针对多时间尺度采样系统快采样变量的信息难以充分利用,建模信息不足的问题,提出一种知识和数据驱动的多时间尺度采样系统的模糊迁移学习建模方法,建立多时间尺度采样系统模型,提高建模精度.首先,设计滤波插补方法填补慢采样变量的空缺... 针对多时间尺度采样系统快采样变量的信息难以充分利用,建模信息不足的问题,提出一种知识和数据驱动的多时间尺度采样系统的模糊迁移学习建模方法,建立多时间尺度采样系统模型,提高建模精度.首先,设计滤波插补方法填补慢采样变量的空缺值,统一慢采样变量和快采样变量为慢时间尺度,利用慢时间尺度变量建立目标模型.其次,提出模型共享机制补充目标模型的建模信息,统一慢采样变量和快采样变量为快时间尺度,利用快时间尺度变量建立参考模型,将参考模型中充足的模型知识迁移到目标模型中.最后,利用参考模型的知识和目标模型的数据学习目标模型的参数,提高目标模型的精度.将提出的建模方法应用于理论数据集,实验证明该方法可以充分挖掘建模信息,建立高精度的多时间尺度采样系统模型. 展开更多
关键词 多时间尺度采样系统 知识和数据驱动 模糊迁移学习 滤波插补方法 模型共享机制 挖掘建模信息
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基于多体系统传递矩阵法的多管火箭定向器振动控制 被引量:14
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作者 展志焕 芮筱亭 +2 位作者 王国平 杨富锋 贺军义 《力学学报》 EI CSCD 北大核心 2010年第3期583-590,共8页
应用多体系统传递矩阵法,建立了全新的多管火箭发射动力学控制模型,以二次型性能指标为成本函数,设计了脉冲推力器为控制执行机构的振动主动控制律,并设计了多管火箭发射系统在燃气流冲击下定向器的振动主动控制系统,获得了最优脉冲控... 应用多体系统传递矩阵法,建立了全新的多管火箭发射动力学控制模型,以二次型性能指标为成本函数,设计了脉冲推力器为控制执行机构的振动主动控制律,并设计了多管火箭发射系统在燃气流冲击下定向器的振动主动控制系统,获得了最优脉冲控制力幅值和脉冲推力器工作次数.应用设计的控制律数值仿真了某多管火箭定向器无控和受控状态下的振动响应,仿真结果表明该法可有效地降低定向器的振动.该方法易于工程实现,对控制多管火箭发射系统的振动、提高多管火箭射击的精度具有重要意义. 展开更多
关键词 多管火箭 多体系统传递矩阵法 振动控制 脉冲推力器
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