| Abstract | On many occasions it is necessary to perform dynamic balancing in the field as an in-situ balancing application. In-situ field balancing is one of the most practical and effective balancing methods because it is not necessary to remove the rotor from the assembly and transport it to the balancing machine location, and then to machine the adaptor housings to fit to the balancing machine, etc. Two-plane dynamic balancing can be used for most rigid rotor balancing, and unless the rotor is flexible, multiplane dynamic balancing with more than two planes is seldom needed.
Until recently, it was impractical if not impossible, for staff of the Engine Laboratory to perform two-plane dynamic balancing in the field. The hand calculation method is very long, and therefore is prone to mistakes. Although a computer program for multiple plane dynamic balancing is available, the time-sharing computer system of NRC is not accessible in the field unless a portable time-sharing terminal as well as a telephone line to the NRC Computation Center are at hand. These difficulties have been overcome by the purchase of a HP41-C hand-held programmable calculator and the suitable accessories. The accessories are 2 extra memory modules and a card reader. The memory modules provide sufficient memory space and the card reader provides back-up for the program so that the program can be re-entered in case the calculator memory is accidentally changed or erased. |
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