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

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Using Roving Disc and Natural Frequency Curves for Crack Detection in Rotors 10

Using Roving Disc and Natural Frequency Curves for Crack Det...

引用

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

作者： Haji, Zyad N. Oyadiji, S. O. Univ Manchester Sch Mech Aerosp & Civil Engn Manchester M13 9PL Lancs England

ISBN: (纸本)9783319099170

In this work, a simple crack identification and localisation approach, which is based on a finite element model of a cracked rotor, is proposed. The model simulates the behaviour of a cracked rotor to provide data to be used to identify the location and depth ratios of a crack in stationary rotor systems. The cracked region, which is an open crack type, is modelled as time-varying stiffness. The rotor is considered as a simply-supported beam carrying a roving disc as an auxiliary mass which transverses along the shaft from one end to the other. A new technique, which is called frequency curve product (FCP) method, is presented to identify and locate a crack clearly in rotor systems. The proposed technique is based on the normalised natural frequency curves (NNFCs) of cracked and intact rotors using the principle of roving masses and natural frequency curves. This technique is developed in order to firstly, solve the disappearance of a crack effect from NNFCs when the crack is close to or exactly at a node of a mode shape. Secondly, FCP curves combine the first four NNFCs in a single plot to identify the crack location clearly. Different pairs of the normalised natural frequencies of different modes of vibration are multiplied together in order to enhance the identification and location of cracks. It is shown that this technique identifies the exact crack location through unifying all the first four natural frequency curves at the maximum positive value in the plot.

关键词： Rotor dynamics Vibration analysis Crack identification Roving disc Open crack Finite element modelling

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Effect of Structural Dynamics on the Shaft Line Rotor Response in Turbomachines 10

Effect of Structural Dynamics on the Shaft Line Rotor Respon...

引用

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

作者： Meli, E. Pallini, G. Rindi, A. Capanni, F. Rossin, S. Univ Florence Ind Engn Florence Italy GE Oil & Gas Auxiliary Syst Engn Florence Italy

ISBN: (纸本)9783319099170

The accurate model of the complicated dynamic phenomena characterizing rotors and support structure represents a critical issue in the rotor dynamic field. A correct prediction of the whole system behavior is fundamental to identify safe operating conditions and to avoid instability operating range that may lead to erroneous project solutions or possible unwanted consequences for the plant. Although a generic rotating machinery is mainly composed by four components (rotors, bearings, stator and supporting structure), many research activities are often more focused on the single components rather than on the whole system. The importance of a combined analysis of rotors and elastic supporting structures arises with the continuous development of turbomachinery applications, in particular in the Oil and Gas field where a wide variety of solutions, such as off-shore installations or modularized turbo-compression and turbo-generator trains, requires a more complete analysis not only limited to the rotor-bearing system. Complex elastic systems such as rotating machinery supporting structures and steel foundations might, in some situations, strongly dominate the entire shaft line rotor dynamic response (mode shapes, resonance frequencies and unbalance response). They give birth to transfer functions which will introduce coupling phenomena between machines bearings, becoming enablers of a new shaft line dynamic. Since FEM theory offers a number of different solutions to represent the rotor and the rotating machine support system (beam models, solid models, transfer function, etc.), in this paper a great emphasis is given to the results of an experimental campaign done on a centrifugal compressor as validation of the new rotor dynamic approach.

关键词： Rotating machines Shaft line Structural dynamics Dynamics stiffness Bearings Dynamic interaction

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Solving the Dynamic Equations of a 3-PRS Parallel Manipulator 5

引用

5th European Conference on Mechanism science (EUCOMES)

作者： Diaz-Rodriguez, M. Bautista-Quintero, R. Carretero, J. A. Univ Los Andes Merida Venezuela Inst Tecnol Culiacan Culiacan Mexico Univ New Brunswick Fredericton NB Canada

ISBN: (纸本)9783319094106

This paper presents and compares three approaches for solving the inverse dynamic model of a general 3-PRS parallel manipulator. The first method obtains the inverse dynamic model by describing the manipulator as three open kinematic chains. Then, the vector-loop closure constraints introduce the relationship between the dynamics of the open kinematic chains and the original closed loop chains. The second method exploits the characteristic of parallel manipulators such that the platform and the links are considered as subsystems. The third method is similar to the second method but uses a different formulation of the Jacobian matrix. This work provides some insight on some advantages and/or disadvantages on how to formulate the dynamic model of a lower mobility parallel manipulator, which can be considered in topic such as the optimal design, parameter identification, and model-based control.

关键词： Limited-DOF parallel manipulator Inverse dynamics analysis Jacobian formulation

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Lab Experiences with LARM Clutched Arm for Assisting Disabled People 5

引用

5th European Conference on Mechanism science (EUCOMES)

作者： Copilusi, C. Kaur, M. Ceccarelli, M. Univ Craiova Craiova Romania Univ Cassino & South Latium Cassino Italy

ISBN: (纸本)9783319094106

Laboratory experiences are reported for an assistive manipulation task by using a prototype of LARM clutched arm. The design and operation of LARM clutched arm are revised to achieve a fairly simple use in an application for assisting disable people in food feeding actions. Results show a suitable arm behavior and proper motion properties in lab tests with arm programing that have been performed mainly by student as user-oriented implementation.

关键词： Service robots Experimental robotics Robotic arms Clutched systems Assistive food feeding robot

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Implementation of VDI Guidelines in Parametric 3D CAD Systems and Their Functional Extension to Dynamically Associative Optimization Tools 1

引用

3rd Conference of the mechanisms Transmissions and Applications

作者： Ahl, Christian Lohe, Rainer Univ Siegen Siegen Germany

ISBN: (数字)9783319170671

ISBN: (纸本)9783319170671;9783319170664

Design guidelines, such as the VDI guidelines, help the designer in the synthesis of gears and mechanisms for standard recurring tasks. The guidelines provide graphical and computational methods, leading the designer systematically to solve the task. In addition to the actual synthesis process, they often contain diagrams and formulas to support identification of a "good" mechanism. This paper shows how the synthesis method derived from such guidelines can be integrated into modern 3D parametric CAD systems. In addition, design criteria can be used in the search for "good" mechanisms which are specifically tailored to the particular application and thus cannot be covered in general guidelines. In order to take into account such criteria in the individual optimization, the editor should work dynamically, interactively and associatively. Simultaneously with the modification of the mechanism via the graphical input device of his of her CAD system, the editor has to identify and manage the new mechanism dimensions, space requirement and the quality of its criteria. The paper clearly shows also that by using design guidelines in conjunction with parametric CAD systems, synergies are realized. The design engineer is offered a good guide to the solution of the task in his or her usual working environment. The use of features and parameters in CAD systems is explained and solutions are shown to design the mechanism according to requirements. Typical applications are shown using the 3D CAD systems CATIA V5 and Pro/Engineer Wildfire 5.0.

关键词： VDI guidelines CAD systems Mechanism synthesis Graphical methods Design criteria

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Composite Shaft Rotor Dynamics: An Overview 10

Composite Shaft Rotor Dynamics: An Overview

引用

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

作者： Gupta, K. Indian Inst Technol IIT Delhi Dept Mech Engn New Delhi 110016 India

ISBN: (纸本)9783319099170

This paper summarizes research on dynamics of composite shafts, with an objective to develop light weight rotor systems. A review of available literature post-1996 is presented here, since a comprehensive review on similar topic was published in 1997 by Singh et al. Specifically the various aspects covered are, theories for dynamic analysis of fiber reinforced composite shaft, their modeling and analysis, experimental work, and design optimization procedures. All these aspects are important for full development of ` Composite Rotors' for light weight high performance transmission systems. Directions for future research are outlined.

关键词： Composite rotors Composite shafts Fibre reinforced shaft Drive shafts Optimization of shafts Composite rotor instability Laminate theory EMBT LBT Smart rotors

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Hybrid Viscous-Structural Damping Identification Method 10

Hybrid Viscous-Structural Damping Identification Method

引用

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

作者： Arora, Vikas Univ Southern Denmark Inst Technol & Innovat DK-5230 Odense Denmark

ISBN: (纸本)9783319099170

Damping still remains one of the least well-understood aspects of general vibration analysis. The effects of damping are clear, but the characterization of damping is a puzzle waiting to be solved. A major reason for this is that, in contrast with inertia and stiffness forces, it is not clear which state variables are relevant to determine the damping forces. In this paper, a new hybrid viscous-structural damping identification method is proposed. The proposed method is a direct method and gives explicit structural and viscous damping matrices. The effectiveness of the proposed structural damping identification method is demonstrated by two numerical examples. First, numerical study of lumped mass system is presented which is followed by a numerical study of fixed-fixed beam. The effects of coordinate incompleteness and different level of damping are investigated. The results have shown that the proposed method is able to identify accurately the damping of the system.

关键词： Damping identification Hybrid viscous-structural dynamic system Direct method

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Cable Function Analysis for the Musculoskeletal StaticWorkspace of a Human Shoulder 2

Cable Function Analysis for the Musculoskeletal StaticWorksp...

引用

2nd International Conference on Cable-Driven Parallel Robots

作者： Lau, Darwin Eden, Jonathan Halgamuge, Saman K. Oetomo, Denny Univ Melbourne Dept Mech Engn Melbourne Vic 3010 Australia

ISBN: (纸本)9783319094892;9783319094885

The study of cable function allows the contribution of particular cables towards the generation ofmotion to be determined for cable-driven parallelmanipulators (CDPMs). This study is fundamental in the understanding of the arrangement of cables for CDPMs and can be used within the design of optimal cable arrangements. In this paper, the analysis of cable function for the musculoskeletal static workspace of a human shoulder is performed. Considering the muscles within the shoulder as state dependent force generators, the set of muscles required in sustaining the gravity force is determined for each workspace pose. As a result, the set of poses that each muscle is responsible for (muscle function) can be computationally determined. By comparing the results to the muscle function from biomechanics studies, it is shown that the results from the proposed cable function analysis are consistent with that reported in the literature of human studies.

关键词： Cables

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Validation of an Enhanced Cylindrical Contact Force Model Using Numerical and Analytical Approaches 5

引用

5th European Conference on Mechanism science (EUCOMES)

作者： Pereira, C. Ramalho, A. Ambrosio, J. Polytech Inst Coimbra Coimbra Portugal Univ Coimbra Coimbra Portugal Univ Tecn Lisboa Lisbon Portugal

ISBN: (纸本)9783319094106

A numerical study is conducted to evaluate the suitability of a new enhanced contact force model to describe contact between cylindrical bodies for very low clearances. An analytical comparison with the behaviour presented by the Johnson cylindrical contact force model is also conducted. Results demonstrate that the enhanced cylindrical model ensures the accuracy of the Johnson cylindrical model although with the simplicity of the Hertz contact model. Differences lower than 6 % separate the numerical results from those obtained with the enhanced model for the application domain analysed.

关键词： Contact mechanics Contact dynamics Cylindrical contact force models Finite element models

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Dynamic Balancing Conditions of Planar Parallel Manipulators 3rd

Dynamic Balancing Conditions of Planar Parallel Manipulators

引用

3rd IFToMM Symposium on Mechanism Design for Robotics (MEDER)

作者： Acevedo, Mario Maria Reyes, Jose Univ Panamer Fac Engn Mexico City DF Mexico

ISBN: (纸本)9783319181264;9783319181257

Force and moment balancing (dynamic balancing) of rigid body linkages with constant mass links is a traditional but still very active area of research in machine dynamics and robotics. The shaking force and the shaking moment caused by all moving links can be reduced in different ways but all having a common difficulty named to derive the so-called balancing conditions, that in general can be cumbersome. In this article a novel method to find the dynamic balancing conditions based on the use of Natural Coordinates is introduced. The method is direct, efficient, and easy to automate through the application of a computer algebra system. It can be used to obtain the shaking force and the shaking moment balancing conditions for planar and spatial mechanisms.

关键词： Dynamic balancing Parallel manipulators Natural Coordinates

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