Abstract: A filling level monitoring device for monitoring a filling level of a fluid in a container includes exciter(s), sensor(s), a signal source connected to the exciter(s), a processor, at least one spatial orientation and acceleration sensor, and a filling level indicator. The device uses the signal source and the exciter(s) to couple vibrational loads having multiple frequency components into the container. Sensors measure vibrations in the container after the exciters transmit the vibrational loads into the container. The processor performs spectral analysis of the input signal and of vibration signals from the sensors, comparing these respective spectral functions to extract resonance frequencies of the container, which are based on the spatial orientation of the container.

Abstract: A filling level monitoring device for monitoring a filling level of a fluid in a container includes exciter(s), sensor(s), a signal source connected to the exciter(s), a processor, at least one spatial orientation and acceleration sensor, and a filling level indicator. The device uses the signal source and the exciter(s) to couple vibrational loads having multiple frequency components into the container. Sensors measure vibrations in the container after the exciters transmit the vibrational loads into the container. The processor performs spectral analysis of the input signal and of vibration signals from the sensors, comparing these respective spectral functions to extract resonance frequencies of the container, which are based on the spatial orientation of the container.

Abstract: An aircraft includes a fuel cell device which can be operated with hydrogen from a hydrogen tank and with oxygen drawn from the surrounding air, and further includes a superconducting magnetic energy storage unit (SMES unit) which is disposed, together with the hydrogen tank, in a cryogenic container, wherein the cryogenic container does not have an active cooling system or a liquid hydrogen generating device, and has a volume for holding a maximum of 40 kg liquid hydrogen.

Abstract: A maintenance information device and method for performing condition-based maintenance by monitoring of the condition of a technical system using a sensor. In order to permit the use of relatively simple sensors with relatively simple evaluation logics, the method and device perform decision making processes on the basis of hyperordinal signals from imperfect hyperordinal condition sensors.

Abstract: An aircraft comprises a fuel cell device which can be operated with hydrogen from a hydrogen tank and with oxygen drawn from the surrounding air, and further comprises a superconducting magnetic energy storage unit (SMES unit) which is disposed, together with the hydrogen tank, in a cryogenic container, wherein the cryogenic container does not have an active cooling system or a liquid hydrogen generating device, and has a volume for holding a maximum of 40 kg liquid hydrogen.

Abstract: A maintenance information device and method for performing condition-based maintenance by monitoring of the condition of a technical system using a sensor. In order to permit the use of relatively simple sensors with relatively simple evaluation logics, the method and device perform decision making processes on the basis of hyperordinal signals from imperfect hyperordinal condition sensors.