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BalancePro

From EverybodyWiki Bios & Wiki

BalancePro is a software to balance rigid rotors in single-plane and two-plane. The software acquires the vibration signal from an accelerometer and the phase signal from a laser tachometer, both signals are processed by the software to provide the 1X running speed vibration amplitude in Velocity units and the rotor's heavy spot phase angle to determine the amount and location of the rotating unbalance. Depending on the rotor configuration the software will provide a balancing solution by using different balancing methods.

History[edit]

The first version of this software was developed by David Bukowitz in 1997 to work in Windows OS, the system used a National Instruments Data Acquisition card connected to a PC computer to acquire the vibration amplitude and phase signals from a velocity sensor and a tachometer. The software was capable of providing a balancing solution for single-plane and two-plane for overhung and inboard rotors, using the vectorial method and the influence coefficients method[1] respectively.

In 2010 the algorithm was converted to work in iOS platform for iPhone and iPod Touch and published by SPAT, LLC by the name iBalanceCalc. The iOS App was capable of providing a balancing solution for Single Plane rotors using the 4-Runs Method and the Vectorial Method; and for two-plane rotors using the Influence Coefficient Method.

The algorithm was used to create the rtrBalanceTools.framework and was Copyrighted by the US Copyright Office under the number ©TX0008883411.

In 2011 Motionics, LLC adapted the App to work with the iPad and to acquire the signals from a DAQ box manufactured by GTI Spindle Technology that was connected through the docking connector, providing the cheapest and more effective solution for rotor balancing in the market at that moment. The System was capable of providing real-time phase and amplitude values using a sampling rate of 44kHz with a resolution of 0.33 Hz. The App was commercialized through the iTunes AppStore by the name iRotorBalancer

In 2013 the rtrBalanceTools.framework was licensed to GTI Predictive Technology to be used as the core of the BalancePro app, with a more sophisticated user interface, the use of Augmented Reality for rotor weight placement and cloud report support.

Operation[edit]

The software provides balancing solutions for 4 basic types of situations:

  • Single-Plane Rotor Balancing using the Vectorial Method: After installing the vibration and phase sensors on the machine, the algorithm will process the filtered vibration value at the running speed frequency and its phase and suggest the amount and location of a trial weight. Once the trial weight is mounted on the rotor, the software will measure the new phasor and provide a correction weight amount and angle that will reduce the imbalance. If the residual imbalance (ISO 1940[2]) is still above the required tolerance, the software will acquire a new unbalance vector and provide a trim weight amount and angle to be added or subtracted.
  • Single-Plane Rotor Balancing using the 4-Runs Method: After installing the vibration sensor on the machine (no tachometer is required), the algorithm will process the vibration value and register it as an original amplitude. Then software will ask to run 3 more tests using a trial weight amount located in three different angles and will provide the correction weight amount and location.
  • Two-Plane Inboard Rotor Balancing: The software uses the input of the vibration sensor and the tachometer to obtain the original imbalance vector for both planes. Then trial weights will be added in the first and second plane respectively to obtain the influence coefficients of the system. The algorithm will calculated the correction weight amount and angle for each plane.
  • Two-Plane Overhung Rotor Balancing: The software uses the input of the vibration sensor and the tachometer to obtain the original imbalance vector for the nearest plane and using the vectorial method finds the correction weight that solves the static imbalance of the rotor. A second part of the test measures the imbalance vector in the far plane to obtain two weights values and angles, which will solve the couple imbalance.

Applications[edit]

  • Field Rotor Balancing in Single-Plane and Two-Plane of electrical motors, fans, blowers, compressors, turbines, centrifugal pumps, pulleys, etc. Field balancing requires the use and correct placement of the vibration and phase sensors to obtain reliable information for the system imbalance[3]. The software algorithm uses the Vectorial Method[4] to solve the single-plane rotor balancing problem and the Influence Coefficient Method[5] to solve the two-plane rotor balancing problem.
  • Shop Rotor Balancing using Soft-Bearing balancing machines
  • Shop Rotor Balancing using Hard-Bearing balancing machines

Variations[edit]

References[edit]

  1. Rieger, Neville F. "Balancing of Rigid and Flexible Rotors" The Shock and Vibration Information Center of the United States Department of Defense (1986): 219-228.
  2. ISO 1940-1:2003(E) "Mechanical vibration - Balance quality requirements for rotors in a constant (rigid) state. Part 1: Specification and verification of balance tolerances" ISO International Standard (Second Edition 2003-08-15): 219-228.
  3. Bukowitz-Kulka, David O., and Juan C. Ustiola-Borjas. "Dynamic balancing of a Ruston TA 1750 turbine. Effect in the location of the vibration sensors." Dyna Magazine (2008): 415-420.
  4. Nakhaeinejad, Mohsen, and Bukowitz, David "Practical Vibration Analysis of Machinery: Case Studies." CreateSpace (2011): 21-45.
  5. Bukowitz, David "Vibration Analysis in Machinery: 15 Study Cases." CreateSpace (2011): 88-96.


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