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54th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference

作者： Williams, R. Brett Fisher, Charles D. Gallon, John C. Raytheon Space and Airborne Systems Power and Interconnect Department 2200 E. Imperial Hwy MS RE/R07/P564 El Segundo CA 90245 United States Jet Propulsion Laboratory California Institute of Technology Instrument Mechanical Engineering Section 4800 Oak Grove Dr M/S 158-224 Pasadena CA 91109 United States Jet Propulsion Laboratory California Institute of Technology Spacecraft Design Section 4800 Oak Grove Dr Pasadena CA 91109 United States

ISBN: (数字)9781624102233

ISBN: (纸本)9781624102233

mechanical springs are a common element in mechanism from all walks of life: cars, watches, appliances, and many others. These springs generally exhibit a linear relationship between force and deflection. In small mechanisms, deflections are small so the variation in spring force between one position and another are generally small and do not influence the design or functionality of the device. However, as the spacecraft industry drives towards larger, deployable satellites, the distances a spring or springs must function over can become considerable so much so that the structural integrity of the device may be impacted. As such, an increasingly common mechanism element is the constant force spring - one that provides a constant force regardless of deflection. These elements are commonly suggested in the conceptual design phase to deal with system-level large deflections, but in the detailed design or integration and test phase they can pose significant implementation issues. This article addresses some of the detailed issues in order for these constant force springs to be properly designed into space systems. © 2013 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.

关键词： Conceptual design

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Comparison of sensor configurations for mass flow estimation of turbocharged diesel engines

Lecture Notes in Control and Information Sciences

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Lecture Notes in control and Information Sciences 2012年 418卷 303-326页

作者： Polóni, Tomáš Rohal'-Ilkiv, Boris Alberer, Daniel Del Re, Luigi Johansen, Tor Arne Institute of Automation Measurement and Applied Informatics Faculty of Mechanical Engineering Slovak University of Technology Bratislava Slovakia Institute for Design and Control of Mechatronical Systems Johannes Kepler University Linz Austria Department of Engineering Cybernetics Norwegian University of Science and Technology Trondheim Norway

ISBN: (纸本)9781447122203

The increasing demands on quality of power, emissions and overall performance of combustion engines lay new goals for the hardware and the software development of control systems. High-performance embedded controllers open the possibilities for application of numerical methods to solve the problems of modeling and control of combustion engines. Algorithms for estimation of state and parameters are essential components of many advanced control, monitoring and signal processing engine applications. A widely applicable estimator is given by the Extended Kalman Filter (EKF) which defines a finite memory recursive algorithm suited for real-time implementation, where only the last measurement is used to update the state estimate, based on the past history being approximately summarized by the a priori estimate of the state and the error covariance matrix estimate. The proposed EKF uses an augmented air-path state-space model to estimate unmeasurable mass flow quantities. The EKF algorithm based on the augmented state-space model considerably reduces the modeling errors compared to the open loop estimator simulation and compared to the EKF without the augmentation which is demonstrated on a standard production Diesel engine data. The experimental validation of the observed state quantities is performed against the measured pressures and turbocharger speed data. The estimated mass flow quantities are indirectly validated through the air compressor flow that is directly validated against air mass flow sensor data. Two two-sensor setups are considered in this study. In the first experiment the intake manifold pressure and the turbocharger speed is used. The second experiment uses the intake manifold pressure and the exhaust manifold pressure as the measurement information for the EKF. The second experiment gives more precise mass flow estimate in term of less bias on the estimates, but more variance due to the high frequency exhaust manifold pressure variations caused by the

关键词： Mass transfer

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Genetic Algorithm for Parameter Identification of Free section Friction

Genetic Algorithm for Parameter Identification of Free Secti...

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第四届国际机械工程与力学会议

作者： Haonan YE Qiang CHEN Guolai YANG Department of Systems and Control Engineering Department of Systems and Control EngineeringNanjing University Department of Mechanical Design and Automation School of Mechanical EngineeringNanjing University of Science and Technology

Friction system is one of the most familiar objects in mechanical system which has nonlinear characteristics. For precise-position and low-speed control, control strategy often relies on friction parameter identification. Considering the limitation of cantilever itself, its friction parameter identification is far more difficult than general. During the research in this paper, real experiment environment and virtual simulation are combined to enhance the understanding of whole mechanical system which is called Augmented Reality Method （ARM）. But when ARM is applied to cognize the system motor process, it is found that traditional method which uses Coulomb Model （CM） is hard to satisfy precision requirement during the system-modeling stage. Because the object of study in this paper is a high-speed process, it is necessary to consider the impact of collision and vibration on cantilever. According to that, sine components are brought in to perfect CM which is called Augmented Coulomb Model （ACM） in order to get a more precise system friction model. After setting up ACM, Genetic Algorithm （GA） is used to realize the parameter identification of the cantilever system. The result points out that the identification precision of using ACM is more precise than CM for high-speed system modeling.

关键词： Cantilever Parameter identification Friction Genetic algorithm

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Modification of an adaptive controller for systems with input saturation and available output derivatives up to the order of relative degree

Modification of an adaptive controller for systems with inpu...

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作者： Takagi, Natsuki Zhuo, Jinxin Oya, Masahiro Wang, Qiang Department of Mechanical Engineering Miyakonojo National College of Technology Miyazaki 8858567 Japan Department of Mechanical and Control Engineering Kyushu Institute of Technology Kitakyushu Fukuoka 8048550 Japan Department of Systems Design and Informatics Kyushu Institute of Technology Iizuka Fukuoka 8208502 Japan

In this paper, the main attention is focused on transient property of control input signal, we propose a novel adaptive controller for time-continuous single-input single-output linear systems with an input saturation in which i-th derivatives of the output signal (i = 1, , relative degree) are available. In the proposed adaptive controller, arbitrary deterministic signals can be used as an input of the reference models. It is shown theoretically that the tracking error between the controlled object output and the reference model output can converge to zero when the initial value of the tracking error satisfies a condition. Moreover, it is also shown theoretically that tracking performance can be improved by setting design parameter. © 2011 Zhejiang University.

关键词： Linear systems

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Improved adaptive steering controller for combined vehicles

Improved adaptive steering controller for combined vehicles

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作者： Wang, Qiang Oya, Masahiro Takagi, Natsuki Department of Systems Design and Informatics Kyushu Institute of Technology 680-4 Kawazu Iizuka-shi Fukuoka Japan Department of Mechanical and Control Engineering Kyushu Institute of Technology 1-1 Sensui-cho Tobata-ku Kitakyushushi Fukuoka Japan Department of Mechanical Control Engineering Miyakonojyo National College of Technology 473-1 Yoshio Miyasaki Japan

If the dynamics of combined vehicles such as tractor-semitrailer varies greatly, it may be very difficult for inexperienced drivers to achieve good handling stability. Moreover, once combined vehicles become unstable, it is very difficult for all drivers to stabilize vehicles. However, if the behavior of actual combined vehicles can track a designed desired combined vehicle, the good handling property can be maintained even when the dynamics of actual combined vehicles varies large. To achieve handling performance better than the conventional control schemes, the authors have proposed the adaptive steering controller. However, in this conventional scheme, the method to improve tracking performance can not be guaranteed theoretically. Therefore, the trial and error method is required in order to improve robust handling performance. In this paper, to overcome this problem, the authors propose a new adaptive steering controller. © 2011 Zhejiang University.

关键词： Automobile steering equipment

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The Research on Time-varying Parameter Identification in Support Beam under Moving Mass

The Research on Time-varying Parameter Identification in Sup...

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第四届国际机械工程与力学会议

作者： Minzhuo WANG Qiang CHEN Guolai YANG Department of Systems and Control Engineering School of Management and EngineeringNanjing University Department of Mechanical Design and Automation School of Mechanical EngineeringNanjing University of Science and Technology

This paper reviews the current knowledge about time-varying parameter identification in support beam under moving mass. The basic models of support beam are described first. Then three classical methods of identification are introduced. Finally, Interpretive Method (IM) is applied to the cantilever and the inertia force which is between the beam and moving mass has been numerical calculated. According to comparison of numerical calculation with different parameters model by using Interpretive Method (IM), relative percentage error is defined. In calculation, only one parameter can be changed, i.e. changing sampling frequency, accuracy of natural frequency or the order of modal. According to the results of identification, the effect of different parameters on the result of identification is discussed and an optimal set of parameters is obtained.

关键词： Time-varying parameter, Inertia force, Identification, Cantilever, Interpretive Method

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Improved adaptive steering controller for combined vehicles

Improved adaptive steering controller for combined vehicles

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International Symposium on Advanced control of Industrial Processes (ADCONIP)

作者： Qiang Wang Masahiro Oya Natsuki Takagi Department of Systems Design and Informatics Kyushu Institute of Technology Fukuoka Japan Department of Mechanical and Control Engineering Kyushu Institute of Technology Fukuoka Japan Department of Mechanical Control Engineering Miyakonojo National College of Technology Miyakonojo Miyazaki Japan

关键词： Vehicles Agricultural machinery Equations Adaptation model Closed loop systems Adaptive systems Driver circuits

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Modification of an adaptive controller for systems with input saturation and available output derivatives up to the order of relative degree

Modification of an adaptive controller for systems with inpu...

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International Symposium on Advanced control of Industrial Processes (ADCONIP)

作者： Natsuki Takagi Jinxin Zhuo Masahiro Oya Qiang Wang Department of Mechanical Engineering National College of Technology Miyakonojo Miyazaki Japan Department of Mechanical and Control Engineering Kyushu Institute of Technology Fukuoka Japan Department of Systems Design and Informatics Kyushu Institute of Technology Fukuoka Japan

In this paper, the main attention is focused on transient property of control input signal, we propose a novel adaptive controller for time-continuous single-input single-output linear systems with an input saturation in which i-th derivatives of the output signal (i = 1, ..., relative degree) are available. In the proposed adaptive controller, arbitrary deterministic signals can be used as an input of the reference models. It is shown theoretically that the tracking error between the controlled object output and the reference model output can converge to zero when the initial value of the tracking error satisfies a condition. Moreover, it is also shown theoretically that tracking performance can be improved by setting design parameter.

关键词： Closed loop systems Polynomials Convergence Adaptive control Lead

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Modeling and experimental analysis of a 6-high industrial rolling mill vibration response

Modeling and experimental analysis of a 6-high industrial ro...

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7th International Conference on Condition Monitoring and Machinery Failure Prevention Technologies 2010, CM 2010/MFPT 2010

作者： Gryllias, Konstantinos C. Antoniadis, Ioannis A. National Technical University of Athens School of Mechanical Engineering Machine Design and Control Systems Section Dynamics and Structures Laboratory Athens 15773 Greece

ISBN: (纸本)9781618390134

During cold rolling of thin sheet, the operation is often accompanied by a variety of undesirable mechanical vibrations, generally referred to as chatter. Chatter is often associated with high rolling speeds and high thickness reductions, conditions that are generally desirable in order to increase mill productivity. Chatter can lead to unacceptable gauge fluctuations, sheet corrugations, surface imperfections, damage to mills and undesirable noise in the work environment. Four and six degree of freedom (DOF) systems describing chatter in sheet rolling in a 6-High rolling mill are proposed. The natural frequencies and the modes of the systems are extracted. The investigation includes the additional plastic deformation of the sheet in the roll-bite that is present during chatter as well as the force displacement relation between the cylindrical rolls being pressed together which is inherently nonlinear due to the changing contact area. It appears that the models are capable of predicting third octave chatter, in addition to fifth octave chatter. A number of mill operational parameters are considered. The models are validated using measurements performed at an industrial 6-high aluminium rolling mill.

关键词： Cold rolling

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A Device that can Produce Net Impulse Using Rotating Masses

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engineering（科研） 2010年第8期2卷 648-657页

作者： Christopher G. Provatidis Laboratory of Dynamics & Structures Mechanical Design & Control Systems Section School of Mechanical Engineering National Technical University of Athens

This paper describes a device capable of producing net impulse, through two synchronized masses, which move along a figure-eight-shaped orbit. In addition to the detailed description of the mechanical components of this device, particular attention is paid to the theoretical treatment of the innovative principle on which the device is based. In more details, the mechanical system consists of two independent but simultaneous rotations, the former being related to the formation of the figure-eight-shaped path and the latter to an additional spinning. Based on the parametric equations of motion of the lumped masses, and considering semi-static tensile deformation of the connecting rods carrying them, it was found that the resultant impulse towards the direction of the spin vector includes a non-vanishing term that is linearly proportional to the time. In addition, reduced but encouraging experimental results are reported. These findings sustain the capability of the proposed mechanism to achieve propulsion.

关键词： Inertial Propulsion Centrifugal Force Net Impulse Rotating Figure-Eight Mechanism

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