Abstract: Methods for balancing rotating machinery, such as gas turbine engines, to minimize vibrations. An optimal engine balance solution is obtained using a hybrid optimization technique based on vibration data from one or more vibration sensors and corresponding influence coefficients which quantify the change in vibration level at the vibration sensors due to a unit increase in unbalance level at unbalance source locations. More specifically, balance weight and angular position are determined based on multiple optimization methods which concurrently process the vibration data, the multiple optimization methods comprising local and global optimization algorithms.

Abstract: An apparatus is provided for implementation of a mid-surface modeler including a receiver, selector, clusterer and mid-surface constructor. The receiver is to receive a solid model of a structural product composed of structural components, with the solid model representing the components by a collection of geometry. The selector is to select a group of geometry from the geometry in the solid model, with the group of geometry having approximately the same shape, and being perpendicular to an axis of a local coordinate system. The clusterer is to cluster geometry of the group of geometry into one or more clusters of geometry based on a relationship between the geometry, with each cluster of the cluster(s) representing a component of the component(s). And the mid-surface constructor is to construct a mid-surface model of the product, including computation of respective one or more mid-surfaces for the cluster(s).

Abstract: Disclosed herein is a method for transferring files between different operating systems that includes sending one or more files from a first computing device executing a first operating system to a second computing device executing a second operating system. The first operating system is incompatible with the second operating system. The method also includes processing data of the one or more files using one or more applications executing within the second operating system on the second computing device. Further, the method includes receiving results of the data processing on the first computing device executing the first operating system.