Jul 12, 2017 how to perform various rotor analyses in the comsol software. The modal analysis of the centrifugal pump is performed using fem technology to find the centrifugal rotor natural frequencies. Modal analysis is the study of the dynamic properties of structures under vibrational excitation. Unit lateral analysis for all new equipment, rerates, and modifications train lateral analysis for coupled machines.
Lateral resonant frequencies can excite on the rotor and result in high damaging rotor vibration. Rotordynamics module analyze the dynamics of rotating machinery with the rotordynamics module. Lateral vibration of a shaft rotor is due to instability, unbalance, or other forces. The torsional frequencies are plotted on the same graph to form a campbell type diagram. Lateral critical speed analysis of multistage centrifugal pump rotor using fea naveena m1, dr.
Rotordynamics analysis services engineering dynamics. Concerned with the rotor part of the pump, the lateral analysis is performed to assess the potential for high vibration, associated degradation, and eventual equipment failure after pump installation. Using axstream rotordynamics, different types of rotating machinery analysis can be performed. Pdf lateral critical speed analysis of multi stage. Lateral rotordynamic analysis rotor bearing technology and. In the video the lateral rotordynamic analysis of a steam turbine rotor on tilting pad bearings with the software madyn 2000 is shown. Basic torsional analysis with the rotor dynamics software. Lateral vibration of a shaft rotor is due to instability, unbalance, or other forces acting on the rotor. Rotor train lateral and torsional resonances and mode shapes. Rotor dynamics rotorbearingssupports lateral vibration. Elliott also uses rotor dynamic studies to troubleshoot operational problems with existing equipment. For horizontal pumps with flexible couplings, only the pump rotor has. The software s front end was redesigned with our customers and industrys input to incorporate the most logical, efficient, and productive techniques to model and analyze complex rotor bearing systems for lateral vibrations.
Rotordynamics design rotor bearing solutions international. The programs are written using 64 bit, double precision code which gives a 15 digit accuracy. Dyrobes rotordynamics software is capable of analyzing lateral, torsional, and. Predictive analysis can lead to better rotating machinery designs. Rotorcalc is an economical rotordynamic analysis program for calculating the undamped lateral and torsional natural frequencies using the wellknown. Coupled lateraltorsionalaxial analysis postprocessor. Basic lateral analysis with rotordynamics software madyn 2000. Dyrobes rotor is capable of linear and nonlinear analyses of free and forced vibrations lateral, torsional, and axial as well as static deflections of multishaft and multibranch flexible rotorbearingsupport. Objectives of rotor dynamics analyses turbomachinery blog. Dec 10, 2016 one of the more notable novel aspects of api610 is that it recommends that there are a number of situations for which lateral rotordynamics analysis is overkill, and therefore its cost can be avoided. Rotordynamics design rotordynamic analysis and design.
Axstream rotordynamics, softinway integrated software platform for rotor dynamics, capable of lateral, torsional, and axial rotor dynamics for all widely used rotor types using the finite element method on either beam or 2daxisymmetric elements, and is capable of being automated. Sep 04, 2019 the purposes and objectives of rotor dynamics analysis rotor dynamics analysis procedure rotorbearing system modeling lateral rotor dynamics torsional rotor dynamics this series will endeavor to get readers feet wet in the world of rotor dynamics, which is still considered a niche discipline of rotating equipment and. Dyrobes rotor is capable of linear and nonlinear analyses of free and forced vibrations lateral, torsional, and axial as well as static deflections of multishaft and multibranch flexible rotor bearingsupport systems. Lateral rotor vibration lrv is radialplane orbital motion of the rotor spin axis. It is with this in mind that rotor dynamics software is arguably one of the most important tools in the turbomachinery design process. Rotordynamics software for predictive analyses of rotating. An accurate model of a rotor system is a model that permits accurate calculation of the actual rotor systems dynamic characteristics. Rotordynamics software for predictive analyses of rotating machines. Rigid coupling and flexible connection made up of elastic coupling units are widely applied to rotorbearing system with multibranched shafting system. Lateral and torsional rotordynamic analyses delta js. Determination of risks due to lateral frame forces caused by torsional. Rotor dynamic analysis experience is present on rotordynamic analysis. Typically components such as bearings and couplings are tuned in order to fulfil specifications.
Engineering consultants for lateraltorsional rotordynamics, rotorbearingseal design, structuralpiping analysis, failuremetallurgical investigations developers of advanced rotating machinery dynamics. Modal analysis is the study of the dynamic properties of. You can also perform a timedependent analysis of the rotor at different angular speeds. We perform rotordynamics design verification and modeling using finite element analysis with dyrobes software, including. How rotordynamics influences pump selection turbomachinery. In this installment, well be looking at the specific purposes and objectives of performing rotor dynamics analyses. New, advanced rotordynamic software new, innovative rotordynamics software for industrial use is under development.
This code solves for steady state critical speeds, force response, and damped mode shapes. Custom rotordynamic software various special analysis software needs can be developed for particular needs and the software provided to the end user with a manual. Resources listed under rotor control software category belongs to software. Torsional analysis for pumps according api 610 pump. One of the more notable novel aspects of api610 is that it recommends that there are a number of situations for which lateral rotordynamics analysis is overkill, and therefore its cost can be. Static deflection analysis allows calculating deflection of the rotor under its own weight as well as reaction on each of the bearings in the system. Rotor control software category is a curation of 10 web resources on, pstrotator, rotorcraft, satellite tracking with winrotor. Modal analysis is the field of measuring and analysing the dynamic response of structures, when excited by an input. In this installment, well be looking at the specific purposes and objectives of performing rotor dynamics. Rotor dynamics is the branch of engineering that studies the lateral and torsional vibrations of rotating shaft, with the objective of predictive the rotor vibrations and containing the vibration level under an. Suresh p m2 pg student, department of mechanical engineering, ksit, bangalore, karnataka, india1 professor, department of mechanical engineering, ksit, bangalore, karnataka, india2 abstract. The program contains extensive modeling, analysis, and postprocessing capabilities. External excitation is applied for measurement of the specific natural.
Rotor dynamics is the branch of engineering that studies the lateral and. Lateral, torsional and structural analyses of pumps can avoid. Axstream rotordynamics, softinway integrated software platform for rotor dynamics, capable of lateral, torsional, and axial rotor dynamics for all widely used rotor types using the finite element. Lateral vibration analysis rotordynamics, critical speed. Identify and correct resonance situations within casings, baseplates and piping as well as rotor lateral and torsional critical speeds. The softwares front end was redesigned with our customers and industrys input to incorporate the most logical, efficient, and productive techniques to model and analyze complex rotorbearing systems for lateral vibrations. A straight line is drawn in the diagram connecting the twice slip line speed yaxis to the rotor synchronous speed xaxis. Suresh p m2 pg student, department of mechanical engineering, ksit, bangalore.
Modal synthesis method of lateral vibration analysis for. A lateral analysis simulates the rotating system, calculates critical speeds, predicts. Page 2 lateral rotor dynamic analysis study reports are generated by turbo machine vendor as normal practice with the help of various software models. Rotor dynamics analysis of a multistage centrifugal pump. Lateral critical speeds analysis for fixed and variable support stiffnesses. Without proper rotor dynamics analysis, rotating machinery is at a higher risk of failure during operation. The torsional frequencies are plotted on the same graph to form a. Rotor dynamics is the branch of engineering that studies the lateral and torsional vibrations of rotating shaft, with the objective of predictive the rotor vibrations and containing the vibration level under an acceptable limit. It is with this in mind that rotor dynamics software is arguably one of the most important tools in the. The analyses are normally carried out according to standards, e. This analysis tool solves for up to six degrees of freedom per node for coupled lateral, axial, and torsional analyses. Lateral systems software and apps simpson strongtie. Static deflection analysis allows calculating deflection of the rotor under its own. This windows based software is very user friendly and easy to use.
Axstream rotordynamics turbomachinery design software. The first step required for calculating lateral critical speeds is to generate an accurate shaft model, which considers each significant section length and diameter and includes all. These situations are when the new pump is identical or very similar to an existing pump, or if the rotor is classically stiff. Romac analysis codes university of virginia school of.
Jul 08, 2016 in the video the lateral rotordynamic analysis of a steam turbine rotor on tilting pad bearings with the software madyn 2000 is shown. The rotor bearing solutions international capability to perform practical rotordynamic analyses and design includes. Simpson strongtie category lateral systems software and apps. Lateral analysis the first goal of a lateral analysis is to determine lateral wet natural frequencies of a rotor system. Rotor dynamics rotorbearingssupports lateral vibration analysis. Lateral and torsional rotordynamics for centrifugal and. Primer on rotor vibration vibration concepts and methods onedegreeoffreedom model multidof models modes, excitation, and stability of multidof models lateral rotor vibration analysis. A key deliverable is a campbell diagram that pictorially identifies which natural frequencies are closest to excitation.
All of the software programs used by rotating machinery consulting were developed using the absoft fortran compiler. The aim of this study is to collect different research paper on the rotor bearing system. Torsional vibration analysis tva vibration, dynamics. Rotors with multiple load lines such as a rotor with a through bolt. The different improved mathematical modeling of rotor bearing system and the application of finite element. Concerned with the rotor part of the pump, the lateral analysis is performed to assess the potential for high vibration, associated degradation, and eventual equipment failure after pump. Steady state rotor response due to base harmonic motion. The following capabilities and features are provided for lateral rotordynamic analysis. The softwares front end was redesigned with our customers and industrys input to incorporate the most logical. Engineering consultants for lateraltorsional rotordynamics, rotorbearingseal design, structuralpiping analysis, failuremetallurgical investigations developers. Lateral analysis also called rotordynamics analysis simulates the rotating system, calculates the critical speeds, predicts vibration amplitudes, and provides recommendations to reduce vibration risks.
This program has been developed for the analysis of free and forced vibrations lateral, torsional, and axial of multishaft and multibranch flexible rotorbearingsupport systems. Xlrotor is the worlds best rotordynamic software because it blends unmatched easeofuse with extensive analytical features. In the video the torsional rotor dynamic analysis of a compressor train with the software madyn 2000 is shown. Empowering our customers with xlrotor, you can analyze any rotating. The acronym, dyrobes, denotes dynamics of rotor bearing systems. Rotor dynamics is different from structural vibrations analysis. Lateral analysis also called rotordynamics analysis simulates the rotating system, calculates the critical. Hello and welcome to the next edition in our introductory series to rotor dynamics analysis. External excitation is applied for measurement of the specific natural frequencies and mode shapes. Whirl speed and stability analysis a revolution in rotor.
In this work an attempt is made to evaluate the lateral critical speeds using ansys software by plotting campbell diagrams and is compared with theoretical calculations and rbts rotor bearing. This feature allows calculation of steady state rotor response of a rotor due to motion of an offshore oil platform, for example. Both lateral and torsional analysis can be executed. Kelm engineering uses the finite elementbased software dyrobes from eigen technologies, inc. Empowering our customers with xlrotor, you can analyze any rotating machine quickly and accurately. Torsional vibration analysis integrated with the pulsation and mechanical vibration analysis ensures superior study results. Torsional forced steadystate response is similar to imbalance response calculation in the lateral analysis.
Train torsional modal, transient, harmonic and reciprocating machines analysis. Moreover, dynrot is a matlabbased code for rotordynamic computations based on fe method. How to perform various rotor analyses in the comsol software. Engineering consultants for lateral torsional rotordynamics, rotor bearingseal design, structuralpiping analysis, failuremetallurgical investigations developers of advanced rotating machinery dynamics armd software for rotor bearing analysis. Jun 14, 2016 in the video the torsional rotor dynamic analysis of a compressor train with the software madyn 2000 is shown. Primer on rotor vibration vibration concepts and methods onedegreeoffreedom model multidof models modes, excitation, and stability of multidof models lateral rotor vibration analysis models simple linear models formulations for rda software insights into linear lrvs nonlinear effects in rotor dynamical systems torsional rotor vibration analysis models rotor based spinning. Lateral, torsional and structural analyses of pumps can. Turbosystems engineering scientific and engineering. The object of the analysis is to calculate the critical speeds of a rotor to find out if there are sufficient margins of separation between critical speed and the rotor operating speed.
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