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检索条件"丛书名=Mechanisms and Machine Science"

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Dynamics of the Unbalanced Support Centrifuge with Cavity Partially Filled with a Multiphase Liquid Medium 10

Dynamics of the Unbalanced Support Centrifuge with Cavity Pa...

引用

10th International Conference on Vibration Engineering and Technology of machinery (VETOMAC)

作者： Kydyrbekuly, Almatbek Khajiyeva, Lelya Al Farabi Kazakh Natl Univ Fac Mech & Math Alma Ata 050040 Kazakhstan

ISBN: (纸本)9783319099170

The paper studies dynamics of the statically unbalanced support centrifuge with a cylindrical cavity partially filled with a multiphase liquid medium and mounted on an elastic foundation. The centrifuge is a rotor, installed cantilevered on the shaft. It is fixed at the lower hinged bearing and the upper elastic bearing and rotates with a constant angular velocity. It is easy to pass from the dynamic model of the support centrifuge to the model of the suspended centrifuge. A mathematical model of the system "centrifuge-multiphase liquid-foundation" is developed and solved analytically.

关键词： Rotor Dynamics Unbalanced support centrifuge Liquid vibrations Foundation vibrations

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Inverse Dynamics of 2-DOF Parallel Mechanism Used for Orientation 5

引用

5th European Conference on Mechanism science (EUCOMES)

作者： Itul, T. Gherman, B. Cocorean, D. Pisla, D. Tech Univ Cluj Napoca Cluj Napoca Romania

ISBN: (纸本)9783319094106

The paper presents the dynamic model of a 2-DOF orientation mechanism, where the Euler's second law has been used. The kinematics, workspace and singularities of the mechanism are also presented. The dynamic model is developed using the motion equations of the mobile platform. Simulations results using the mentioned model as well as a commercial simulation software are shown.

关键词： 2-DOF parallel mechanism Orientation angles Kinematics Inverse dynamics

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Hybrid Permanent Magnet and Foil Bearing System for Complete Passive Levitation of Rotor 10

Hybrid Permanent Magnet and Foil Bearing System for Complete...

引用

10th International Conference on Vibration Engineering and Technology of machinery (VETOMAC)

作者： Bekinal, Siddappa Iranna Anil, Tumkur Ramakrishna Rao Kulkarni, Sadanand Subhas Jana, Soumendu Natl Aerosp Labs Prop Div Bangalore 560017 Karnataka India Gogte Inst Technol Dept Mech Engn Belgaum 590008 Karnataka India

ISBN: (纸本)9783319099170

This paper deals with the complete passive levitation for a typical Jeffcott rotor and rotation of the same at the speeds around 40,000 rpm. The passive levitation is achieved by supporting the rotor axially by a permanent magnet bearing and discrete bump foil bearings for the radial support. The permanent magnet bearing is made up of three pairs of ring magnets arranged in Halbach pattern. Bump foil bearings are designed for rotor weight to provide the radial support to the rotor system. The proposed rotor-bearing configuration is analysed using Finite Element Analysis (FEA) software (ANSYS) for rotor dynamic characteristics. The designed rotor bearing system is fabricated and tested up to the speeds of 40,000 rpm. The system response is acquired using advanced rotor-dynamic data acquisition system. The experimental results show that the rotor is completely airborne and stable at the desired speed.

关键词： Foil bearings Permanent magnet bearings Halbach structure Passive levitation and rotor dynamics

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Crack Propagation in a 500 MW LP Turbine in Service 10

Crack Propagation in a 500 MW LP Turbine in Service

引用

10th International Conference on Vibration Engineering and Technology of machinery (VETOMAC)

作者： Hahn, Wolfgang Futter, David EDF Energy West Burton Power Stn Retford DN22 9BL Notts England EON New Build & Technol Ltd Technol Ctr Nottingham NG11 0EE England

ISBN: (纸本)9783319099170

A 500 MW turbine generator set that operated through a rigorous two shift regime had developed a crack whilst in service. The shaft line was regularly subjected to multiple starts with oil whirl manifesting on load during certain operational conditions. First observations on generator no. 11 bearing showed an increase in the 1x component over a period of time, with changes through the critical speed during run-down triggering close monitoring. Further observations over time revealed that the Low Pressure turbine three, 1x and 2x components increased during steady state in conjunction with changes in phase angles and critical speed during transient conditions. Early indications showed that the likelihood of a crack in the main turbine shaft was high. Further observations over time revealed that the 1x and 2x steady state trends continued to increase up to the ISO limits set for the turbine generator set. The unit was shut down and qualitative inspections undertaken. The findings revealed that a crack had developed on the main rotor body in the pencil shaft.

关键词： Cracked rotor Vibration Low pressure turbine Oil whirl

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Axis Cross-Coupling Reduction on a High Bandwidth XY Flexure Stage 3rd

Axis Cross-Coupling Reduction on a High Bandwidth XY Flexure...

引用

3rd Conference on Microactuators and Micromechanisms (MAMM)

作者： Ruiz, A. Campa, F. J. Altuzarra, O. Petuya, V. Pinto, C. Hernandez, A. Univ Basque Country UPV EHU Dept Mech Engn Bilbao Spain

ISBN: (纸本)9783319158624;9783319158617

Flexure stages are widely used in the field of micro and nanopositioning because of their repeatability and precision, which is due to the lack of joints that induces uncertainty. In the present Twork, a XY flexure stage has been analyzed and redesigned to reduce the axis cross-coupling, which is due to a parasitic motion in the amplification stage of the mechanism. The performed modifications result in a high reduction of the undesired motion, while maintaining a similar amplification and natural frequencies. The main advantage of the redesign is that the cross-coupling reduction is achieved mechanically, instead of using the position control loops.

关键词： Micro/Nanopositioning Flexure stage Compliant mechanisms Mechatronics

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Identification of Hysteretic Behavior of Magnetorheological Dampers Using NLARX Model 10

Identification of Hysteretic Behavior of Magnetorheological ...

引用

10th International Conference on Vibration Engineering and Technology of machinery (VETOMAC)

作者： Shehata, A. Metered, H. Oraby, W. Helwan Univ Cairo Egypt

ISBN: (纸本)9783319099170

Magnetorheological (MR) dampers are the most promising devices for vibration control applications because it has many advantages such as mechanical simplicity, high dynamic range, low power requirements, large force capacity and robustness. In this paper, a new approach for studying the forward and inverse dynamical behavior of an MR damper using Non-Linear Autoregressive Models with Exogenous Inputs (NLARX) is presented. NLARX is a built-in function related to the identification toolbox, MATLAB/Simulink software, used to identify the nonlinear behavior of dynamic and engineering systems. The training and validation of the proposed model are done theoretically using the data generated from the modified Bouc-Wen model. Validation data sets representing a wide range of working conditions of the damper show that the use of the NLARX model to predict the forward and inverse dynamical behavior of MR dampers is reasonably accurate.

关键词： Identification Magnetorheological (MR) damper NLARX model

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On the Experimental Intradiscal Pressure Measurement Techniques: A Review 5

引用

5th European Conference on Mechanism science (EUCOMES)

作者： Araujo, A. Peixinho, N. Pinho, A. Claro, J. C. P. Univ Minho Braga Portugal

ISBN: (纸本)9783319094106

The intradiscal pressure has been essential for prevent the spinal complaints by forming a basis for clinical advice to promote the correct sitting postures. As a consequence, it is evident the need of an accurate method for measure the intradiscal pressure, to better understand the disc response to hydrostatic pressure fluctuations. Numerous reviews regarding disc mechanics are available, including intradiscal pressure benchmarks;however, an analysis on the techniques of intradiscal pressure measurement is needed. Therefore, this review will remain focused on the methodologies adopted for measure the intradiscal pressure in several conditions: for different daily activities, under external loads and for values where occurs annulus fibrosus disruption. The importance of the intradiscal pressure on disc function will be discussed as well as the some guidelines for design new measurement techniques will be defined.

关键词： Intervertebral disc Intradiscal pressure

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A Three-Dimensional Multibody Model of the Human Ankle-Foot Complex 5

引用

5th European Conference on Mechanism science (EUCOMES)

作者： Malaquias, T. M. Goncalves, S. B. Tavares da Silva, M. Univ Lisbon Inst Super Tecn IDMEC P-1699 Lisbon Portugal

ISBN: (纸本)9783319094106

In this work, a three-dimensional foot and leg model is proposed, which combines six rigid bodies and five kinematic pairs to produce an articulated system of four segments (toes, mid-forefoot, rearfoot and leg) with thirteen independent degrees-of-freedom. The model is described using a multibody dynamics formulation with natural coordinates and estimated anthropometric parameters. A massless link is used to model the anatomical offset between the talocrural and talocalcaneal joints, avoiding the inclusion of a specific rigid body to model the talus bone. The reliability of the model was tested through its application to the study of the kinematic and dynamic patterns of the human gait. A male subject was analyzed and his data compared with literature, enabling to attest the consistency and realism of the proposed model.

关键词： Multi-segment foot model Multibody dynamics Kinematics Kinetics Gait analysis

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Analysis of Locally Nonlinear Two Dimensional Periodic Structures Using NOFRFs 10

Analysis of Locally Nonlinear Two Dimensional Periodic Struc...

引用

10th International Conference on Vibration Engineering and Technology of machinery (VETOMAC)

作者： Cheng, C. M. Peng, Z. K. Zhang, W. M. Meng, G. Shanghai Jiao Tong Univ State Key Lab Mech Syst & Vibrat Shanghai 200240 Peoples R China

ISBN: (纸本)9783319099170

The analysis of locally nonlinear two dimensional (2D) periodic structures is studied using the concept of nonlinear output frequency response functions (NOFRFs). NOFRFs are a series of one-dimensional functions of frequency, which allow the analysis of nonlinear systems to be implemented in a manner similar to the analysis of linear system in the frequency domain. By inspecting the relationships between the NOFRFs of unit cell in the locally nonlinear two dimensional periodic structures, a series of properties about the NOFRFs of the nonlinear system are derived. The correctness of these properties is demonstrated by numerical studies. These properties obtained in this paper are of significance to the frequency response analysis for nonlinear 2D periodic structures. One important potential application of these properties is the location of damage in 2D periodic structures, which make system behave locally nonlinearity.

关键词： Volterra series Nonlinear output frequency response function (NOFRF) Two dimensional (2D) periodic structure Damage detection

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Development of Adaptive Compliant Gripper Finger with Embedded Actuators 3rd

Development of Adaptive Compliant Gripper Finger with Embedd...

引用

3rd Conference on Microactuators and Micromechanisms (MAMM)

作者： Milojevic, A. Pavlovic, N. D. Univ Nis Fac Mech Engn Dept Mechatron & Control Nish Serbia

ISBN: (纸本)9783319158624;9783319158617

Developing a gripper that can grasp objects of widely varying shapes represents a challenging task. Compliant mechanisms with embedded actuators are one way to obtain the gripper which could accommodate its grasping surface to any irregular and sensitive grasping object. This paper presents the new solution of adaptive compliant gripper finger with embedded actuators. Embedded actuators (within gripper finger structure) are able to morph shape of the grasping surface to accommodate different objects. Novel approach to the synthesis of compliant mechanisms with embedded actuators is also presented. The main contribution of this approach is that optimization of the actuator placement is included in the design process. It will be shown that gripper finger can achieve many complex grasping patterns via embedded actuators.

关键词： Adaptive gripper finger Compliant mechanism Embedded actuators Shape morphing surface Synthesis

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