Design and optimization method of a twodisk rotor system. Browse through a list of free utilities, drivers, software, and links to topicrelated sites. Intelligent approach to robust design optimization of a rotor. In optimization of flexible rotorbearing systems, commonly used design variables are bearing locations 5,12 and bearing parameters such as dynamic coefficients 6,14 15 1617. Mar 04, 2020 this is considerably easier when your software for modeling bearings, seals, and the machines aerodynamic properties are all connected to your rotor dynamics tool.
Hydrodynamic journal bearings optimization considering rotor. The rotary inertia and the internal damping in rotor were included in their analysis. Mutual coupling effect between sliding bearing and rotor is considered in the optimization model. Rotor dynamics fundamentals, basic design rules and analyses according api and other standards, bearing simulation aspects and more are explained. Unbalanced response and design optimization of rotor by ansys. An elliptical sliding bearing of shafting has been optimized, and the solution result shows that the shafting stability has been increased, it indicates this method is feasible. Conjugated optimization for the entire rotorbearing system is a cha llenging task due to various conflicti ng desig n requirements, which should be fulfilled. Response is determined at six stations 1 left extreme of shaft, 2disc, 3first bearing. The standard rotordynamic code for agnetic m bearing systems cannot meet the industrial.
The axial shift of the rotor is performed automatically by hydraulic pistons. Evaluating the impact of bearing misalignment on rotor. Multiobjective rotor dynamics optimization of the plain. Evgen kashtanov lead rotordynamics and bearing engineer. Numerical and experimental study on the multiobjective. Multiobjective optimization of rotorbearing system with. Rotor dynamic analysis and bearing optimization study of a.
Rotordynamics software with nonlinear magnetic bearings, flexible rotor, flexible foundation and high fidelity catcher bearing. Two methods are proposed for the identification of the unbalance characteristics. Centrifugal compressor optimization for watercooled chillers. Meanwhile, the paper analyzes the sensitivity of the system on the first two critical speeds towards structural parameters. An extremely useful book is the optimization software guide, by jorge more and stephen wright, from siam books. This 3day 8 hours per day course covers rotor dynamics analysis and bearings simulation for different types of rotors and bearings journal, gas, rolling elements and thrust. Errors tracking, tasks creating, development control, bug fixing. In the present study, optimum design parameters of a rotor bearing system are found by employing multiple multiobjective optimization schemes for simultaneously minimizing unbalance response, maximizing stability limit speed, and minimizing system weight. This webinar will include and discuss why rotorbearing systems are the most. Study of parametric and nonparametric optimization of a. Bearingrotor coupled system stability optimization design.
Rotor dynamics and bearings were done by my initiative, now sales grows up. Mar 26, 2015 this paper presents the results of the rotordynamic analysis and design optimization performed for a turboprop engine rotor system consisting of a freepower turbine and a gas generator. The performance enhancement feature of the hydraulic clearance optimization upgrade is achieved by shifting the rotor against flow direction to optimize turbine clearances during steady state operation. More specifically, the damping and stiffness characteristics of the bearing can influence the location and the severity of the rotors critical speed and amplification factor which, as we have seen, are critical to understanding the safe operation of a rotorbearing assembly. Optimization rotor hole to reduce force in cold pressing rotor into crankshaft chengguo chu jiaxipera compressor co. Conjugated optimization for the entire rotor bearing system is a cha llenging task due to various conflicti ng desig n requirements, which should be fulfilled. Empowering our customers with xlrotor, you can analyze any rotating machine quickly and accurately. The finite element method has been widely used in modeling and analyzing the complex rotor bearing systems with minimal numerical problems. Huang and lin obtained the natural frequencies and the critical speeds of a typical rotor bearing system by solving the frequency equation in terms of receptances. Study on dynamic optimization design of the rotor system. Constrained design optimization of rotortilting pad bearing systems. Analysis was carried out to aeroelastic dynamics of bearingless rotor.
This paper presents the highlights of a complete rotor dynamics analysis and bearing optimization study that was performed on a 3800 hp multistage steam turbine. The bearing support is modeled by an equivalent stiffnessbased approach via the journal bearing node provided in the beam rotor interface. More specifically, the damping and stiffness characteristics of the bearing can influence the location and the severity of the rotor s critical speed and amplification factor which, as we have seen, are critical to understanding the safe operation of a rotor bearing assembly. Also included in the simulation is the material and geometric properties of the rotor as well as important parameters for the fluid film on the bearings, such as the dynamic viscosity. Engineering students looking for a comprehensive, theoryrich and handson course allowing them to meet the requirements of their future customers. The structure parameter of sliding bearing has significant influence on entire shafting. Meshing was performed using shell elements and the necessary material properties like permeability and bh curve were defined along with the load conditions. The optimal designs, however, must be finalized to meet other requirements not considered during the optimization. This fact depicts the importance of an efficient optimization method to be used. Identification and optimization of unbalance parameters in. This is considerably easier when your software for modeling bearings, seals, and the machines aerodynamic properties are all connected to your rotor dynamics tool. Hydraulic clearance optimization hco modernization and. Trc continuation proposal 2015 2016 rotordynamics software. This unit is coupled to a three stage, postertype, centrifugal air compressor with two high speed pinion shafts engaging a common bull gear.
Romac current research university of virginia school of. The bearing design variables are selected as parametric design variables and topology optimization is applied to the support structure. Jul 12, 2017 you can model this rotor using the beam rotor interface in the comsol multiphysics software. Rotor is rotated by engine pulley through belt drive system, whil. A part of these studies focused the optimization process on the geometrical characteristics of the rotor 23, considering the bearing supports as idealized springs with nonspeed dependent stiffness coefficients. Paul is a cofounder of rotor bearing solutions international. Multiobjective optimization of rotorbearing systems with an. Apr 01, 2020 different bearings can influence the rotors behavior differently.
This is resource for finite element analysis, finite element method fea, fem, cae and design optimization. The design will be performed in order to generate simplified models for both the bearings individually, as well as for the full rotor bearing system. Softinway, a leading turbomachinery software and service provider, has accumulated a wealth of experience in the field of design and analysis of manifold rotorbearing systems such as steam and gas turbines rotors, axial and radial compressors, turbochargers, pumps, generators and motors, and so on. Easy to use with a hydraulic press, will not hurt the bearing, assures a perfect fit every time. Threshold performance optimization of a rotorbearing system. In critical speed calculations of rotor bearing systems, beam188 and matrix27 elements are adopted. Rotor bearing installationremoval tool designed by david atkins in the early 80s. The main goal of this work is to motivate and give an idea to designers who are willing to deal with optimization of rotorbearing sytems. The purpose of this study is to utilize taguchi method, which can prove to be a handy and effective tool for determining minimum vibration. In this work, the optimization technique has been used to find diameters of shaft elements and bearing supports so that the optimized rotor bearing system can sustain a larger fluid leakage force. In the proposed method, the pce method instead of the. The beam rotor with hydrodynamic bearing interface enables you to capture the behavior of this assembly, easily coupling the behavior of the rotor and bearings. Sep 29, 2018 the paper describes the identification and optimization of unbalance parameters in rotor bearing systems.
Without proper rotor dynamics analysis, rotating machinery is at a higher risk of failure. Optimization of rotor shaft shrink fit method for motor using robust design eiji toma1 received. How to perform various rotor analyses in the comsol software. Hydrodynamic journal bearings optimization considering.
Multiobjective optimization of rotorbearing systems with. Managing and support of the software development rotor dynamics, bearing. Rotorsupport model illustrated in figure 1 is a general twolevel rotorsupport model showing the major components represented by the transient analysis model. Once you have taken all these steps, the model may need to be refined according to the data that is collected during mechanical testing if the critical speeds differ by more than 5%. Structural dynamics optimization of rotor systems for a small. Experimental optimization of a hybrid foilmagnetic bearing. The campbell diagram of the freepower turbine rotor system is significantly affected by the optimization. In the present study, optimum design parameters of a rotorbearing system are found by employing multiple multiobjective optimization schemes for simultaneously minimizing unbalance response, maximizing stability limit speed, and minimizing system weight.
Different authors tried to analyze the rotor bearing assembly using ansys software. This article is an open access publication abstract this research is collaborative investigation with the generalpurpose motor manufacturer. The software model determines the optimal indexing and squaring of the shafts to the rotor modules as well as rotortorotor mating. The paper establishes the mechanical model of sfdsliding bearing flexible rotor system, adopting rungekutta method to solve nonlinear differential equation, thus acquiring the unbalanced response curve and then gaining the first two critical speeds of the system. It contains references to 75 available software packages, and. The first level outboard of the shaft is labeled the oil film and connects the rotor with the pedestal supports. Integrated design and optimization of gas bearing supported rotors. Testing software manual mostly, results validation. This paper presents experimental optimization of a hybrid foilmagnetic bearing to support a flexible rotor. Structural dynamics optimization of rotor systems for a. Commercial feabased software for rotordynamics, multibranch torsional vibration, fluidfilm bearings hydrodynamic, hydrostatic, and hybrid design, optimization, and performance evaluation, that is used worldwide by researchers, oems and endusers across all industries. Constrained design optimization of rotortilting pad bearing. Hybrid foilmagnetic bearing is a synergistic crossfertilization of two oilfree bearing technologies.
Application of optimization methods in rotor dynamics. Energy analysis to the design of rotorbearing systems. Axstream rotordynamics turbomachinery design software. To find the minimum peak amplitude values by experimenting different combinations of the rotor bearing system set needs a lot of experiments for reaching solution.
Armd advanced rotating machinery dynamics is a new generation software package, developed by rbts, to bring you the most advanced and complete rotorbearing analysis capabilities for evaluating practically any bearing, rotorbearing system, or mechanical drive train. Chen is the creator of dyrobes dynamics of rotorbearing systems. May 14, 2019 the beam rotor with hydrodynamic bearing interface enables you to capture the behavior of this assembly, easily coupling the behavior of the rotor and bearings. Optimization of rotor shaft shrink fit method for motor. Shafting logarithmic decrement is taken as the objective function, the bearing widthdiameter ratio, relative clearance and main design parameters such as ellipticity is taken as design. Optimization design of magnetic bearing reaction wheel rotor using.
Rotor clutch subassembly is one of the very important subassemblies sa of an automotive compressor as it delivers the required torquepower to run the compressor. Moreover, the solution proves costly because of the time consumed in doing many experiments. The results show that the threshold performance of rotor bearing systems can be significantly improved by slight modifications of the shaft diameters. These factors play very important roles in designing a. Experimental optimization of a hybrid foilmagnetic. Rotor bearing solutions international is an engineering consulting services firm in charlottesville, virginia specializing in rotordynamics, bearing analysis, analysis active and passive magnetic bearing systems, and vibration analysis. Sep 18, 2014 the bearing design variables are selected as parametric design variables and topology optimization is applied to the support structure.
Optimization rotor hole to reduce force in cold pressing. Unbalanced response and design optimization of rotor by. In this paper, multiobjective genetic algorithm was used to optimize the weight and stability of a rotor system, so that the stability of the rotor system was improved while the weight was reduced. In this webinar, we will present an overview of chiller technology before going into both the control optimization of existing compressors to maintain maximum coefficient of performance cop at all operating conditions, and a novel method of compressor design that optimizes iplv across multiple intended operating points. Lee and choi analyzed a multistepped rotor supported by two angular contact ball bearings by using transfer matrix method and reduced the weight of the rotor through optimization. The study on rotor dynamics optimization of the plain bearingrotor system was conducted.
In this paper, an intelligent robust design approach combined with different techniques such as polynomial chaos expansion pce, radial basis function rbf neural network, and evolutionary algorithms is presented with a focus on the optimization of the dynamic response of a rotor system considering support stiffness uncertainty. Design optimization of rotorbearing system considering critical. Pareto front of multiobjective optimization design for bearingless rotor was acquired by. The system is solved using frontal solver to find response of the system in terms of amplitude and phase angle plots. Rotor bearing solutions international a company with. Transient modal analysis of nonlinear rotorbearing systems. Afterwards, a multiobjective optimization model for reducing vibration and aeroelastic dynamic of bearingless rotor was built. Methods for detection of rotor crack and bearing wear on free shipping on qualified orders. Nonlinear simulation of defected rotorbearing systems. Ansys solution once the finite element model has been prepared, harmonic analysis is performed by applying an unbalance force at the rotor assuming an eccentricity of 0. Design optimization of rotorbearing system considering.
In this project, the 3d model of helicopter main rotor hub shall be done in unigraphics and imported into ansys software to perform static analysis to analyse the strength of rotor hub and optimise by using different materials. In the threedimensional software, we create assembly model about crankshaft and rotor, calculate the press force by. Xlrotor is the worlds best rotordynamic software because it blends unmatched easeofuse with extensive analytical features. Armd, unique to the world, is the only software that integrates all of these powerful analytical tools into a single package. The proposed procedure can also be used to improve the system stability by considering the design variables. Threshold performance optimization of a rotorbearing.
Softinway, a leading turbomachinery software and service provider, has accumulated a wealth of experience in the field of design and analysis of manifold rotor bearing systems such as steam and gas turbines rotors, axial and radial compressors, turbochargers, pumps, generators and motors, and so on. Rotor support model illustrated in figure 1 is a general twolevel rotor support model showing the major components represented by the transient analysis model. The structural optimization of elliptical sliding bearing based on the genetic algorithm theory is studied in the paper. Buy nonlinear simulation of defected rotorbearing systems. The stock mazda rotor bearing tool is about twice as expensive and doesnt work as well. The design will be performed in order to generate simplified models for both the bearings individually, as well as for the full rotorbearing system. For easier maintenance and transport, weight of such systems is also a critical criterion. The paper describes the identification and optimization of unbalance parameters in rotorbearing systems. Intelligent approach to robust design optimization of a.
Instability threshold and stability boundaries of rotor. Different bearings can influence the rotor s behavior differently. Also for the package ansys, with tips, tricks, macros and faq. In this work, the optimization technique has been used to find diameters of shaft elements and bearing supports so that the optimized rotorbearing system can sustain a larger fluid leakage force. Request pdf optimization design of magnetic bearing reaction wheel rotor using isight software this paper analysed the modal of control system aiming at. This page is dedicated to finiteelementanalysisbased optimziation, especially in structural mechanics, structural optimization and engineering optimization. The result is a straight assembly with optimized performance.
Making the most of your assets requires focused efforts in all areas, from inventory optimization to maintenance planning. In 1980 he started the rotating machinery and controls industrial research lab, at the university of virginia with several other professors and was its first director. Vibration characteristic analysis and optimization of. To find the minimum peak amplitude values by experimenting different combinations of the rotorbearing system set needs a lot of experiments for reaching solution. The results show that the threshold performance of rotorbearing systems can be significantly improved by slight modifications of the shaft diameters. Automatic system optimization design with genetic algorithms, to guide users on. Performance optimization of compressor rotor clutch sub.
Fegade et al 8 used alternative method named harmonic analysis to find frequency of rotor bearing assembly using ansys. It mainly consists of rotor and bearing, stator, hub and armature. Rma develops and supports software for rotating machinery analysis. Since 1994, rma has been helping engineers model and analyze rotating equipment quickly, efficiently, and reliably. Software provides a predictive rotortorotor andor rotortoshaft mating model for assembled rotors and their respective shaft. The entire optimization workflow is constructed in the commercial software isight, and abaqus and atom abaqus topology optimization module are used for rotordynamics analysis and topology optimization. The dynamic analysis of sfdsliding bearing flexible rotor. The results obtained and presented in this study are to provide a comparison with numerical optimum design methods such as gradient. Rotordynamics software with nonlinear magnetic bearings, flexible rotor.
Pdf constrained design optimization of rotortilting pad. Rotor bearing system design turbomachinery design software. In optimization of flexible rotor bearing systems, commonly used design variables are bearing locations 5,12 and bearing parameters such as dynamic coefficients 6,14 15 1617. Rotordynamics software with nonlinear magnetic bearings, flexible.
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