Practical balancing of flexible rotors for power generation. The instrumentation provides the pilot continuous information on all the helicopter. These generic titles refer to whether or not rotor flexibility is taken into account. A programme dealing in unbalance, its various types, tolerances, measuring unbalance single multi plane, balancing speed, correction of unbalance, correction of unbalance, state of rotors, recommended standards iso 1925, 19401, 2953, 142, working of dynamic balancing machines, field balancing, case studies etc. Instrumentation instrumentation on the exec 162f is normally maintenance free. Alshurafa, vibration engineer saudi electricity company ghazlan power plant.
So, there are procedures to rectify this kind of faults or the problems in the. The system, which is composed of an extremely robust digital triaxial sensor based on mems technology and a computer with preinstalled balancing software, is quite easy to install, in that no setup or accessories such as tachometric sensors or stroboscopic lamps, are necessary. Balancing is a procedure by which the mass distribution of a rotor is. Ga are adopted in this method, which is helpful to simplify the balancing procedure and enhance the balancing accuracy. A rigid rotor can be balanced by making cor rections in any two arbitrarily selected i rnr u i a. The problem of balancing a flexible highspeed rotor on a bmseries balancing machine is addressed. Balancing a highspeed rotor on a balancing machine. In my search for ways to do the motor balancing part i happened on this excellent video from one of the posters, pajonate, on. Twoplane field balancing of an overhung rigid rotor.
Study on online active balancing system of rotating. Unfortunately, it is the theoretical value assuming the rotor was spinning in free. In the manufacturing process, if proper care is taken to ensure that castings. Yes it is necessary to support the component being balanced at the same or near about of the bearing supports for proper results. Rotor balancing with single plane 4runs method youtube. That is, flexible rotor balancing procedures take into account rotor flexibility, while rigid rotor balancing procedures do not. As you can tell, industrial dynamic balancing and vibration analysis are services that are vital to the proper operation and maintenance of a wide variety of scientific, industrial, and technical. Analysis of balancing of unbalanced rotors and long shafts using gui matlab. Dynamic balancing of rotating machinery experiment technical advisor. The only place, which stays accessible for balancing after assembly, is location of compressor impeller tch 2. Pdf practical balancing of flexible rotors for power. Once youve identified the problem areas, youre going to need our dynamic balancing services in lansing, michigan to correct all the issues. The standard vibration analyzer system includes an ipad air or.
The vibration magnitude and phase angle must be obtained using a suitable balancing machine. Applications to a low noise flight procedure and a transient maneuver demonstrates its capabilities. Frequency spectra of the vibration signal, upper before balancing and lower after balancing performing a frequency analysis before an attempt is made at bal alignment, or a bent shaft. The over view of the lecture is that rigid rotor balancing, we will be focusing in todays lecture. Perform a check balance on the fully assembled rotor after the component assembly procedure above, with final corrections normally on two correction planes near the ends of the rotor near bearings a. A portable, handheld, batterypowered rotor balancing calculator has a data port, which includes a host communications port to down load setup data from, and upload collected data to a host computer. In dynamic balancing do we need to support the component on the machine in the same location as in assembly. Rotating machinery rotor balancing lifetime reliability solutions. Fabian wittmer explains how to achieve it through accurate rotor balancing. Analysis of balancing of unbalanced rotors and long shafts using gui matlab, matlab applications for the.
Dynamic balancing services in lansing, michigan hitek. Pdf analysis of autogyro rotor balancing and vibration. A device for the execution of the procedure comprises a balancing machine with at least one tunable support for accommodation of a rotor to be investigated. Analysis of balancing of unbalanced rotors and long shafts. Dynamic balancing international balancing standards industrial. Rotor balancing the importance of smooth running smooth running is the sine qua non of high performance, high availability turbocharging. Rotorway exec 162f maintenance manual pdf download. Piedmont chapter vibration institute training symposium 10.
A new field balancing method of rotor systems based on holospectrum and genetic algorithm. Application notes static and dynamic balancing of rigid. It means no more than an acceptable magnitude of vibration is caused by the unbalance remaining in the rotor. Author links open overlay panel shi liu b liangsheng. With the advancement in control strategies and active vibration control using magnetic bearings, a. Abstract rotor balancing needs to be reexamined in the present days context. I he balancing procedure tor flexible rotors is more complicated, because of the elastic deflections of the rotor. Highspeed balancing hsb of generator and turbine rotors offers a number of advantages.
The aim of rotor balancing is to achieve satisfactory running when installed on site. The correct application of this method ensures the operation of. Formulation of a transfer function between rotor responses. Practical balancing of rotating machinery pdf free download. Twoplane field balancing of an overhung rigid rotor introduction an overhung rigid rotor is one that has its balance correction planes located outside the supporting bearings, as shown in figure 1 1, and whose rotational speed is well below the first critical speed 3. Details of the software products used to create this pdf file can be found in the.
The dynamic balancing of moving components can significantly reduce wear and tear and avoid high replacement costs and downtime in your plant. A rotor is said to be rigid when the flexure of the. Rotating machinery rotor balancing the aim of rotor balancing is to achieve satisfactory running when installed on site. The procedure to acquire the required data and balance the rotor is as follows. The unit under test is bolted to the platform and is rotated either with a belt, air, or end. A new field balancing method of rotor systems based on.
Finally, a specific application instance and procedure based on the proposed method are showed. Rotating machinery rotor balancing lifetime reliability. The file is used in the case the user wants to save the graphical outputs. Dynamic balancing should not be a substitute for poor machining or other compromise manufacturing practices. The article contains excerpts from the paper, rotor balancing tutorial by ray kelm, dustin pavelek and walter kelm of kelm. Run the machine again and measure the 1x rpm vibration level and phase angle once more. A method for lowspeed stepbystep balancing is proposed and implemented by the rotor manufacturer. Balancing procedure an overview sciencedirect topics. Specification and verification of balance tolerances, gives specifications for rotors in a constant rigid state according to their machinery type. Study on online active balancing system of rotating machinery and target control method pan xin, wu haiqi, gao jinji, mu yuzhe beijing key laboratory of health monitoring and selfrecovery for highend mechanical equipment. Rotor balancing is a procedure by which the mass distribution of a rotor or part or module is checked and, if necessary, adjusted to ensure the unbalance tolerance is met. The incremental rotor balancing procedure turbomachinery. Balancing is a process of controlling the mass distribution of a rotor and improving it. Rotor balancing calculator computational systems, inc.
Muscolo et al formulation of a transfer function between rotor responses on a high speed balancing machine and in turbo machinery by system identification. The new proposed method is simple and easy to peel the phase coupling relationship between incentive and response, which can be used to guide dynamic balance weighting for singledisk rotor system on site. Rotor balancing methods may be separated into two categories. Rotor balancing crystal instruments leading innovation. Pdf dynamic balancing and shaft alignment researchgate. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. Mechanical vibration methods and criteria for the mechanical balancing of flexible rotors see other formats disclosure to promote the right to information whereas the parliament of india has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote. A novel method of dynamic balance weighting for single. Check balance process will normally allow limited balance correction, since major corrections would have been. It is, however, extremely important to keep it in perfect operating condition. Initial run till 110% first test run with a test weight on 1 balance plane till 110% test weight must be large enough to see a good change in amppplitude and phase continue first test run with balance weight changes to the other.
Balancing of rotors, hard or soft according to iso142 we always propose the following procedure. In the manufacturing process, if proper care is taken to ensure that castings are sound and machining is concentric, then it follows that the. The data is used in a balancing program for calculating the required balancing weight and position for attaching a balancing mass to the rotor. Correlation procedure and device for rotor balancing. Two plane balancing can also be done by alternately restraining the device at each of two planes, typically near the ends, such that it can only pivot. Just download one of the free spectrum analyzer programs. Rotor balancing is a type of analysis that compares the vibration profile with the rotation of a mechanical element to characterize inconsistent weight distribution around the diameter while calculating the amount and position of the weight necessary to offset the net imbalance. The ability to access optimal weight planes, which are not normally accessible during operation in the machine. The machine usually consists of two rigid pedestals, with suspension and bearings on top supporting a mounting platform. I this international standard specifies a single convention for balancing the individual components shafts or rotors, and fitments of a keyed assembly. Practical balancing of rotating machinery this page intentionally left blank practical balancing of rotating machin. With one of the largest contract dynamic balancing facilities in the north of england, our dynamic balancing services cover balancing of components from 50g to 11 tonnes. A balancing machine is a measuring tool used for balancing rotating machine parts such as rotors for electric motors, fans, turbines, disc brakes, disc drives, propellers and pumps.
The methods employed in shop balancing can have a profound impact on the resulting balance condition of the rotor. Faq on dynamic balancing balancing machine dynamic. Vary the motor speed, recording the unbalance at each speed. General procedure of finding u the steps described below may be applied to all rotors regardless of their mass distribution and the position of the correction planes. The motivation for following this incremental balance procedure is to minimize the unbalance of the rotor in general, but to specifically reduce the modal unbalance that can result if this method is not followed. Smooth operation through the entire speed range up to overspeed. By andy ruehs manager, dynamic analysis engineering there are numerous advantages to highspeed balancing of generator and turbine rotors. In the case of a flexible rotor, it also means that not more than an acceptable magnitude of deflection occurs in the. The impact of shop balance technique is most important when the rotor is relatively flexible andor long as is common with most turbomachinery. He does a great job of outlining the process of dynamically balancing outrunner motors and this is the basis for this howto.
Analysis of autogyro rotor balancing and vibration. This document covers the balancing of rotors with rigid behaviour. The international standards organisation iso publishes several standards which are the global benchmark for industrial balancing. Rotor balancing methods and instrumentation springerlink. First attach two accelerometers, one near each of the bearings of the rotor being balanced. The following describes the procedure for performing single or two plane balancing. Switch the pivot to the balanced plane and balance the other plane.
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