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With the availability of a smaller and cheaper device to measure water density and temperature also below the waters surface, an acquisition of much higher quantity and therefore a much higher data resolution would be possible. The institute for mechatronics in mechanics therefore would like to extend the cheap and simple surface drifter with a device, which allows to dive horizontally vertically and acquire measurement data with the drifters existing sensors. The extension needs to be adaptable to the existing drifter construction and should allow a diving depths of two meters. The diving device shall be designed as an extension and therefore should function independently of the drifter. The interface to the drifter is implemented by a I2C communication to trigger a diving procedure a power connection to the energy supply of the drifter.
CONCEPT IMAGE
Requirement Specification
| ID | Title | Rationale | Values | Module | Importance | Notes |
|---|---|---|---|---|---|---|
| 01 | Diving Depth | The diver should be able to pull the drifter with an upwards buoyant force of 10N down to a maximum depths of 2 meters. | 10N | |||
| 02 | Vertical diving accuracy | The diver should be able to dive to specific water depths and hold this position with an vertical accuracy of +/-0.1m | +/- 0.1m | |||
| 03 | Horizontal diving accuracy | In calm waters, during a diving process, the diver should only move vertical and should have a horizontal positioning error of less then 0.2m for a vertical movement of 1m | 0.2m horizontal/1 vertical m | |||
| 04 | Mass limit | The mass of the diver is limited by the maximum buoyant force of 10N. The drifter should still float, when the diver is attached and turned off. | 10N upwards buoyant force | |||
| 05 | Geometrical limits | The diver should be attached to the drifter and should not increase the outer dimensions of the drifter by more than 10%. | 10% of outer dimensions of drifter | |||
| 06 | Costs | The costs of the components should be kept to less than 75€ | 75€ | |||
| 07 | Computing hardware | The diver should have its own computing unit which controls the diving process. | ||||
| 08 | Power limitation | |||||
| 09 | Logic Requirements | |||||
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Implementation guidelines
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| Interfacing Requirements | ||||||
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Implementation guidelines
The implementation shall be simulated with Matlab Simulink and Simscape....