Abstract: A system for actively controlling the charging profile of a battery uses a software-based alternator control unit to control the charging voltage. The system optimizes battery and alternator life. The system, on a dynamic basis, uses battery open-circuit voltage (OCV) to estimate battery state-of-charge (SOC). Also, the charging current of the battery is periodically estimated; this, after processing, provides an estimated SOC of the battery.

Abstract: A system for actively controlling the charging profile of a battery uses a software-based alternator control unit to control the charging voltage. The voltage applied to the battery is initially increased over normal values following battery discharge, to charge the battery back as fast as possible without damaging the battery or alternator. The voltage is then reduced to a normal charging level, and subsequently further reduced to a float level.

Abstract: An apparatus for absorbing vibrations in a structural member, such as in an aircraft fuselage, has first and second plates for attaching to the structural member. A mass, which is suspended between the plates, includes a first block connected to the first plate by a first spring and a second block connected to the second plate by a second spring. The springs may be formed by metal straps which allow the mass to move along one axis or by rods which allow two axis movement of the mass. One sensor produces a signal indicating vibration of the structural member and another sensor produces a signal indicating vibration of the mass. A mechanism connected to the first and second block responds to a control signal by varying a distance between the first and second block to alter stiffness of the first and second springs.