Specially designed to study sleeve bearings machinery

Transcription

1 Expertises vibratoires de machines tournantes Expertises vibratoires de structures Mesures de contraintes Shaft dynamic simulator Specially designed to study sleeve bearings machinery On sleeve bearings machinery, main defaults are due to rub, shaft resonance frequency, oil film instability (WHIP and WHIRL). It s necessary to master their specific diagnostic: orbit analysis, backward or forward whirl to realize a complete predictive maintenance. This simulator allows to study shaft dynamic behaviour in hydrodynamic sleeve bearings machinery. A stainless steel oil tank with pump and pressure gage allows oil flow to the bearings for a good lubrification. Characteristics : Portable, robust and easy learning. Realize a multi-plan balancing. Study main machinery defaults and learn their vibratory signatures. Study shaft critical speed phenomenon. Study main sleeve bearing machinery defaults and learn their vibratory signatures (orbits, GAP). Easy way to create default on the machine. Books with exercises to an individual learning. For specific studies, 34options kits are available. Scalable, robust and functional, Ideal for learning. Specifications : 1/2 HP motor (3 phases) with variable frequency AC drive and multi-featured front panel programmable controller Pressurized fluid film bearings with features to change bearing clearance, length, and type. Includes two full sleeve bearings with multiple oil inlet prots, tapped holes for mounting two proximity probes at 90 degrees, ability to rotate probe at any angle. Oil distribution and pressure adjustment system including of pump, pressure gage, stainless steel oil tank, back flow safety switch, pressure interlock gauge Vibration isolators mounts and base stiffener One 12.7 mm (1/2 )TGP straight steel shaft Dimension : 12cm36cm65cm Weight : ~60kg Discs Three steel disks with one row of 18 holes Safety Impact resistant clear safety cover with safety interlock

2 Option kits to shaft simulator The shaft simulator provides you with a basic setup for performing rotor dynamics experiments and learning vibration signatures of different machine malfunctions. However, a detailed investigation of a particular phenomenon will require additional attachments and fixtures. Technivib has thought carefully about various applications of the expert system. Listed below are several Option Kits to be used for performing different in-depth studies. Each Option Kit provides you with a wealth of information to increase your knowledge of rotor dynamics and machinery fault diagnostics. It is important to note that the expert system is very versatile and can be configured in many more ways than those associated with the standard Option Kits. Study kit WHIRL/WHIP (MR-OWSK-1/2): Learn effects of oil bearing instability. Recognize signature of WHIRL and WHIP. This kit contains 8 pads (4 pairings) to change bearing clearance. 2 specific pads are elliptic to generate whip/whirl instability. Kit to change for a ¾ shaft(mr-bsk-3/4) Study the defaults on a ¾ shaft. This kit contains ¾ pads, ¾ shaft, 2 holed discs and a coupling. Study kit WHIRL/WHIP for ¾ shaft (MR-OWSK-3/4): Learn effects of a stiffer shaft on bearings instability. This kit contains 8 pads (4 pairings) to change bearing clearance. 2 specific pads are elliptic to generate whip/whirl instability. Eccentric Rotor Learn the effects of rotor eccentricity on vibration spectra. Determine relationships between eccentricity and unbalance. Develop techniques to locate and correct the effects of eccentricity. Learn the effect of varying the mass moment of inertia on vibration amplitude. The kit consists of one aluminum rotor with an asymmetrically located center bore and one clamp collar.

3 Cocked Rotor Learn the effects of a sheave that has not been fitted to the shaft properly. Learn vibration signature of a cocked rotor. Develop methods to correct cocked rotor problems. Learn the effect of varying the mass moment of inertia on vibration amplitude. The kit consists of a cocked aluminum rotor and one clamp collar. Set of Four Coupling Types The spectral pattern for shaft misalignment is a strong function of coupling stiffness. Learn the effects of coupling stiffness on rotor dynamics and vibration signature of various defects. Clarify the complexities of machinery shaft misalignment problems. Each kit consists of one gear, one LoveJoy, one rubber, and one rigid steel coupling. Coupling End Bent Shaft The coupling end bent shaft reveals a complicated vibration signature due to gyroscopic effects. Observe the difficulty associated with attempting to balance an overhung rotor with a bent shaft. Learn to cope with the alignment issues due to a bent shaft. Conversion kit to rolling bearing (M-RBK-1/2) Allows to put the shaft on rolling bearings. Kit contains to rolling bearings with their housing for a ½ shaft. 1/2" Shaft Bearing Fault Kit The kit provides deliberately faulted bearings to learn waveform and spectra of classic bearing defects when bearing fault frequencies are not close to multiples of the shaft running speed (RPM). The kit includes four faulted bearings: one outer race, one ball, one inner race, and one combination defect. Cocked Bearing Housing Due to improper seating, bearings are sometimes not installed uniformly in the cavity, creating a cocked situation. Recognizing the signature of a cocked bearing is beneficial in that corrective action can be taken long before failure occurs. The kit consists of one bearing housing designed to exhibit this condition. 3/4" Shaft Bearing Loader Demonstrate how rotor loading affects bearing vibration amplitude. Location can be adjusted axially. A radial load on bearings shows the effects of loading and enhances the spectral amplitude. The kit consists of one 1" bore loader and two clamp collars.

4 3/4" Shaft Bearing Fault Kit Deliberately faulted bearings to learn waveform and spectra of classic bearing defects. Learn about signal processing issues such as averaging techniques, leakage, and spectral resolution on determining bearing faults. Perform experiments while increasing the severity of defects. Determine why ultra-high resolution spectrum is needed to diagnose a bearing fault when fault frequencies are located close to multiples of RPM. Learn how a large signal can mask adjoining low amplitude signals due to spectral leakage. The kit consists of one inner race defect, one outer race defect, one with ball defect, and one combination of defects. The default frequencies are very close to the multiples of shaft RPM. Mechanical Rub Kit This kit permits the evaluation of typical rub phenomena associated with a variety of materials under different angle, loading, and lubricant conditions. Experiments can be performed on the shaft or rotor. Easy to install different materials for rubbing experiments. The kit consists of an adjustable tool holder for the rub material, a vertical post, a horizontal bar, and clamping mechanism. Damped Bearing Housing Kit This kit provides a bearing housing with a higher damping factor than the standard housing. Typical rolling element bearing systems are an allmetal structure with virtually no damping. This item will enable you to add damping to a standard rolling element bearing housing. The amplitude of the resonance of a structure (or critical speed of rotors) is primarily controlled by its damping. A typical rotor resonance amplitude tends to be high, creating violent vibration. This kit can be used to demonstrate the reduction in rotor resonance amplitude due to the installation of damping. This approach can be used in real life situations where the other common techniques such as mass and/or stiffness variation cannot be applied or is cost prohibitive. In many situations, damping is the most cost effective and appropriate means to attenuate resonant vibration. Technivib has unique expertise in damping technology. The kit consists of two special bearing housings and two ½" bearings fitted with isolators.

5 Force Transducer Measure forces exerted on bearings due to coupling misalignment, rotor unbalance, belt misalignment, belt tension Demonstrate how mass unbalance force quadruples when the speed is doubled, but vibration amplitude does not follow the same trend Establish quantitative tensions for drive belt studies Learn to relate the vibration signature to forces associated with common malfunctions such as resonance, bearing faults, and more Witness 180 degree phase shift between heavy and high spots when rotor goes through a critical speed Verify and refine your rotor dynamic models and enhance modeling skills Learn phase relationship between force and vibration spectrum Learn nature of rotor dynamic forces due to common defects There are three options available depending on the customer requirements: Vertical force transducer for 5/8 and ½ diameter shaft Horizontal force transducer for 5/8 and ½ shaft Combined horizontal and vertical force transducer for 5/8 and ½ diameter shaft The kit consists of one appropriate force transducer with cables and one matching signal conditioner and power supply.

6 Example of possible studies : Shaft critical frequency Run-up 83.3 Hz 16.6 Hz In this configuration (discs position), 2 critical speeds at 16.6 Hz and 83.3 Hz are measured. Orbit analysis confirms the behaviour of a critical speed.

7 Phenomenon shown with WHIP WHIRL study kit Tests below show phenomenon that can be seen during a run-up from 0 to 5100 RPM. Tests have been done with resonance kit (12.8mm shaft) and with whirl/whip kit. One dics in a central position was on the shaft for a 1rst critical frequency at 23Hz (1380 RPM). Spectres cascades 3D Order 0.49 Whip Order 1 F0: 5100 RPM Soit 85 Hz Order 0.49 Whirl 1 st critical frequency Order 1 F0 : 360 RPM or 6 Hz Colormap 2D 0.49 f0 Whip 0.49 f0 Whirl 1 ère shaft critical frequency : 23 Hz On this 2 representations, WHIP and WHIRL phenomenon (oil film instability in the bearing) appears clearly.

8 RUB : Orbit shows an abnormal strength applies to the shaft: RUB.