study on the dynamic problems of double-disk rotor
Theoretical and experimental study on the dynamic response
The dynamic response of a multi-disk rotor system with coupling misalignment is investigated theoretically and experimentally considering the nonlinear oil film force The rotor is simplified to a lumped mass model and the governing equations are derived considering the gyroscopic effect
Dynamic Balancing of Rotating Machinery in the Field
the rotor usually one near each end of the rotor as shown in Fig 1 The farther apart these corrective planes are the smaller in general may be the corrective weights When balancing such a rotor in a balancing machine the rotor may be mounted elastically in such a way that it is pivoted to oscillate about some chosen radial axis
Look Ahead Based Control Strategy for Hydro
Oct 09 2020Energies 2020 13 5240 5 of 22 where Jr is the Moment of Inertia of the rotor tpump is the torque due to resistance in the rotor which is modelled as [1 2] tpump = V˜ pDP p h mech p (9) DP pis the differential pressure in the transmission line which is also the two pump inlets h mech is the Pump Mechanical Efficiency V˜ p is the Pump Displacement which in our study is a dynamic
Study of Twin Rotary Compressor for Air
rotor top in a twin rotary compressor comparison with a single rotary compressor An about 50% cut in the amount of whir ling in the twin rotary compressor below that of the single rotary compressor attests to its exceptionally improved dynamic balance
Dynamic Balancing
Dynamic balancing becomes necessary for a wide range of commercial and industrial equipment for the obvious reason that virtually all rotors eventually become unbalanced from a variety of conditions For example some operational causes of unbalance include rotor fouling from accumulated dirt or other deposits on the rotor bowing of rotors due to uneven heating or shaft damage loss of rotor
Rotating Machinery Rotor Balancing
Rotating Machinery Rotor Balancing The aim of rotor balancing is to achieve satisfactory running when installed on site It means no more than an acceptable magnitude of vibration is caused by the unbalance remaining in the rotor In the case of a flexible rotor it also means that not more than an acceptable magnitude of deflection occurs in the
Dynamic Analysis of a Dual
This paper deals the dynamic analysis of a flexible low-speed rotor model having both rotational asymmetries and transverse shaft cracks Asymmetric disks or transverse shaft cracks in rotors lead to parametric inertia (or stiffness) excitations in rotor-bearing system When both of them appear in a rotor system prediction of parametric instability behavior has not gained sufficient attention
Calculation of Journal Bearing Dynamic Characteristics
tion (I C ) engine or rotor dynamic behavior The journal bearing lubrication problem has been extensively studied over the past forty years Among the first studies are those using the mobility method (Booker (1) (2)) It is widely used for crankshaft and connecting rod bearings due to its simplic-
About dynamic analysis procedures
Abaqus offers several methods for performing dynamic analysis of problems in which inertia effects are considered Direct integration of the system must be used when nonlinear dynamic response is being studied Implicit direct integration is provided in Abaqus/Standard explicit direct integration is provided in Abaqus/Explicit Modal methods are usually chosen for linear analyses because in
Dynamic Balancing
Dynamic balancing becomes necessary for a wide range of commercial and industrial equipment for the obvious reason that virtually all rotors eventually become unbalanced from a variety of conditions For example some operational causes of unbalance include rotor fouling from accumulated dirt or other deposits on the rotor bowing of rotors due to uneven heating or shaft damage loss of rotor
Study on Balance System of Rotary Compressor
In order to study on the balance system of a rotary compressor not only the inertia force of eccentricity but also the gas force is taken into account to build a mechanical model of the rotor system The rotor system is constitutive of a crankshaft (including a roller) a motor rotor
Vibration Signature Analysis of 4 Jaw Flexible Coupling
Figure 3 (two rotors in intermediate position in two planes) It consists of a D C motor a flexible coupling and a double disk rotor The rotor shaft is supported by two identical ball bearings and has a length of 660 mm with a bearing span of 460 mm The diameter of the rotor shaft is 20 mm Two disks of 128 mm in diameter and 10 mm
Dynamic Balancing
Dynamic balancing becomes necessary for a wide range of commercial and industrial equipment for the obvious reason that virtually all rotors eventually become unbalanced from a variety of conditions For example some operational causes of unbalance include rotor fouling from accumulated dirt or other deposits on the rotor bowing of rotors due to uneven heating or shaft damage loss of rotor
Study Questions/Problems Week 8
Study Questions/Problems Week 8 Chapters 11 Formulates and apply Newton's laws to rotating systems defines angular momentum and illustrates how conservation of angular momentum is a powerful problem-solving tool Again this chapter covers many aspects of rotational statics and dynamics hence another long list of problems Chapter 11:
Shape memory alloys applied to improve rotor
DINAME 2015 - Proceedings of the XVII International Symposium on Dynamic Problems of Mechanics V Steffen Jr D A Rade W M Bessa (Editors) ABCM Natal RN Brazil February 22-27 2015 Shape memory alloys applied to improve rotor-bearing system dynamics – an experimental investigation Sren Enemark 1 Ilmar F Santos and Marcelo A Savi2
A REVIEW OF WAVE ROTOR TECHNOLOGY AND ITS
rotor at a correctly designed speed is negligible [4 5] It only needs to overcome rotor windage and friction in the bearings and contact sealing if used Alternatively rotors can be made self-driving This configuration known as the "free-running rotor" can drive itself by using the momentum of the flow to rotate the rotor [6 7]
Linear Dynamic study with harmonic loads: Why n
Nov 14 2018This is supported in normal (non linear dynamic - had to add quotes on that so as not confuse people) frequency study I don't use Swx sim for this not sure if this can be done there or not Seems pretty odd that it would be supportEd in a frequency study but not in a linear dynamic study
Nonlinear Dynamic Behavior of Double
In the case of considering the shear effect and gyroscopic effect a finite element model is developed to study the nonlinear dynamic behavior of a double-disk isotropic rotor- bearing system with axial rub-impact in this paper The influences of rotational speed and initial phase difference on the operation stability of the rotor-bearing system are discussed
A Novel Dual
2 1 Rotor Parameterization using Actuator Disk/Line/Surface Models Numerical modeling of wind turbine/farm aerodynamics can be classi ed into two categories based on whether or not rotor geometry is resolved When the relevant length scale in the problem is smaller or comparable to blade chord (e g in dynamic load computations or very
A Novel Dual
2 1 Rotor Parameterization using Actuator Disk/Line/Surface Models Numerical modeling of wind turbine/farm aerodynamics can be classi ed into two categories based on whether or not rotor geometry is resolved When the relevant length scale in the problem is smaller or comparable to blade chord (e g in dynamic load computations or very
Non
Vibration is a major issue in rotor systems Due to the presence of material property dispersions manufacture or assembling errors and time-varying working status rotor systems are always subject to uncertainties The uncertainties should be taken into consideration to understand the dynamic characteristics of rotors more thoroughly In this study interval analysis is carried out to
Motor Current Signature Analysis (MCSA)
3 Rotor Fault A rotor bar defect is identified by comparing the Pole Pass Frequency side band to the line frequency (50Hz) and analysing the data through an FFT Analyser The difference in amplitude would normally be 50dB or greater Broken rotor bars also cause skewed or erratic inductance patterns at the peak of the sinewave 4 Air Gap
Abaqus Users
I am working on rotor dynamics to study the behavior of a turbine shaft I have some problems with abaqus/CAE and it is defining rotor dynamic force in order to take in to account the effects of this force I define ROTDYNF but it has no effect on the behavior of the shaft and all of the stresses are zero
Shape memory alloys applied to improve rotor
DINAME 2015 - Proceedings of the XVII International Symposium on Dynamic Problems of Mechanics V Steffen Jr D A Rade W M Bessa (Editors) ABCM Natal RN Brazil February 22-27 2015 Shape memory alloys applied to improve rotor-bearing system dynamics – an experimental investigation Sren Enemark 1 Ilmar F Santos and Marcelo A Savi2
The ERCOFTAC centrifugal pump OpenFOAM case
IAHR WG Meeting on Cavitation and Dynamic Problems in Hydraulic Machinery and Systems Brno 5 The ERCOFTAC centrifugal pump (ECP) cases that are currently available are listed here: Steady state frozen rotor cases using MRF (Multiple Reference Frames) ECPGgi2D: The frozen rotor approach and the GGI between the impeller and the diffuser







