Abstract: A method for early detection of the vortex ring state in a helicopter includes steps of establishing flight control signals for flight control with regard to the vertical movement axis of the helicopter, detecting resultant movements in the vertical movement axis of the helicopter, and detecting an impending vortex ring state of the helicopter in accordance with a correlation between the flight control signals and the vertical movements in the vertical movement axis.

Abstract: A method provides detecting a contact state between at least one driver/operator of a vehicle and a control input device designed to control the vehicle, where a frequency spectrum is calculated from sensors detected movement signals based on which the contact state between the control input device and the driver/operator is determined.

Abstract: The invention relates to a method for early detection of the vortex ring state in a helicopter, having the following steps: establishing flight control signals for flight control with regard to the vertical movement axis of the helicopter and detecting resultant movements in the vertical movement axis of the helicopter, and detecting early the vortex ring state of the helicopter in accordance with a correlation between the flight control signals and the vertical movements in the vertical movement axis.

Abstract: The invention relates to a rotatable antifriction bearing (1) having a first bearing ring (2), a second bearing ring (3) which can be rotated with respect to the first bearing ring (2), and a plurality of rolling bodies (4) which are arranged between the first and the second bearing ring (2, 3), at least one rolling body (4) being configured as an electric sensor in such a way that the rolling body (4) is set up for changing a directly electrically detectable characteristic variable as a function of a force which is exerted on said rolling body (4). Moreover, the invention relates to a rolling body for an antifriction bearing of this type, and to a device having an antifriction bearing and an electric monitoring device.

Abstract: The invention relates to a method for detecting a contact state between at least one driver/operator of a vehicle and a control input device designed to control the vehicle were a frequency spectrum is calculated from sensors detected movement signals based on which the contact state between the control input device and the driver/operator is determined.