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By first measuring the static moment of the individual turbine blades and then sorting them into the ideal order, jet engine manufacturers have found that they can greatly reduce the time and effort required to balance the rotor of an engine. More recently a new concept has emerged: if a computer record is kept of […]

Static balancing a gimbaled sensor assembly will virtually eliminate jitter in many applications. However, in the case of the most demanding applications, or when the gimbal design has forced major asymmetry in component mounting, residual jitter may still occur. The remaining angular jitter is induced by the existence of a dynamic imbalance excited by random […]

The success of a satellite mission is highly dependent on the accuracy of the measurement of its mass properties before flight and the proper ballasting of the satellite to bring the mass properties within tight limits. Failure to properly control mass properties can result in the satellite tumbling end over end after launch, or quickly […]

Since March 1, 2006, the United States Golf Association (USGA) has imposed a limit on maximum moment of inertia (MOI) of golf clubheads. The limit is on moment of inertia around the vertical axis through the clubhead center of gravity (Izz). On April 11th 2006, the USGA announced that the maximum allowed MOI has been […]

Aerodynamic Flutter on Aircraft Control Surfaces – Testing and Measurement Analysis Flutter is of great concern to any pilot, since excessive flutter has caused a number of aircraft to lose control and crash. Although any surface on an aircraft which is exposed to air flow can experience aerodynamic flutter, the most common type of flutter […]