Volker Baumbach

Multi-Parameter Monitoring System für Hydraulische Flüssigkeiten

Zusammenfassung Es wird ein miniaturisiertes Messsystem für hydraulische Flüssigkeiten vorgestellt. Das System besteht aus zwei Teilen: (i) einem opto-chemischen Sensor, der die Stärke und die energetische Lage der O-H Absorption in der Umgebung von 3500 cm−1 detektiert, und (ii) einem Partikelsensor, der auf einem Lichtschrankenprinzip beruht. Der erste Sensor misst den Wasser- und den Säuregehalt und der zweite die Anzahl fester Teilchen in der Flüssigkeit. Abstract A miniaturised sensor system for aviation hydraulic fluids is presented. The system consists of an optochemical sensor and a particle sensor. The optochemical sensor detects the form of the O-H absorption feature around 3500 cm−1 to reveal the water and acid contamination in the fluid. The particle sensor uses a light barrier principle to derive its particle contamination number.

Optimal routing of pipes in a virtual environment using nonlinear programming

Abstract Nowadays the routing of pipes inside or outside of structural components is usually done with CAD tools like CATIA. Up to now it is the task of design-engineers to manually find a connection between two points in which on one hand respects all design directives and on the other hand minimises the weight of the pipe. As in general the number of feasible routings is very high, if not infinite, it is almost impossible to find an optimal solution without a powerful algorithm and an immense amount of development time. This paper presents a mathematical framework which allows the designer to automatically generate the optimal routing. To do so, the aforementioned problem is treated as an optimisation problem. With the mass of the pipe as the cost function to be minimised and the design directives handled as equality and inequality constraints, this leads to a nonlinear problem (NLP) which is solved by WORHP – a large-scale sparse NLP solver. A series of practically relevant scenarios like routings close to structural components, routings with standard bending angles as well as network routings for metallic and non-metallic pipes are investigated. First tests with real assemblies reveal that a significant reduction of the total mass is achieved by optimising the existing routing.