Development and Validation of a Bump Detection Alarm System for Recreational Boats
Bäck, Sabina (2024)
2024
Julkaisu on tekijänoikeussäännösten alainen. Teosta voi lukea ja tulostaa henkilökohtaista käyttöä varten. Käyttö kaupallisiin tarkoituksiin on kielletty.
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi-fe2024062658852
https://urn.fi/URN:NBN:fi-fe2024062658852
Tiivistelmä
Owners of recreational watercrafts may be concerned of the safety of their boats’ hull while it is moored in the harbour. Utilizing existing hardware in a multifunctional device (MFD), this thesis seeks to contribute to enhancing boat safety by developing an alarm system for boats. The objective is to investigate the possibilities for and implement an alarm system, called the Bump Detection Alarm System, for a MFD to alert boat owners when a potentially harmful collision has happened. When the watercraft is powered off a microcontroller (MCU) is going through sensor data regularly and it draws power from the boat’s battery. Therefore, strict power limitations are to be considered developing the alarm system. The memory of the MCU is at maximum capacity leading to strict memory limitations that also needs to be considered developing the alarm system.
An inertial measurement unit (IMU) is embedded in the MFD and using its accelerometer data a potential solution will be sought for. Since the alarm system will send notifications to the boat owner’s mobile application, an excessive number of notifications is to be avoided rather than notifying them of every potential harmful collision. Tests have been conducted iteratively and a solution have been proposed, where the MFD does not draw too much power from the boat’s battery. Using continuous sampling of the IMU at an output data rate (ODR) of 204Hz, a g-scale range of 2g and jerk, or rate of change of acceleration, the device will send a notification to the boat owner’s mobile application at most every 10 minutes if potential harmful collisions occur. The boat owner will be able to set the sensitivity of the Bump Detection Alarm System through the application. The alarm system has been approved for testing in a larger scale and might yet be improved according to test results.
An inertial measurement unit (IMU) is embedded in the MFD and using its accelerometer data a potential solution will be sought for. Since the alarm system will send notifications to the boat owner’s mobile application, an excessive number of notifications is to be avoided rather than notifying them of every potential harmful collision. Tests have been conducted iteratively and a solution have been proposed, where the MFD does not draw too much power from the boat’s battery. Using continuous sampling of the IMU at an output data rate (ODR) of 204Hz, a g-scale range of 2g and jerk, or rate of change of acceleration, the device will send a notification to the boat owner’s mobile application at most every 10 minutes if potential harmful collisions occur. The boat owner will be able to set the sensitivity of the Bump Detection Alarm System through the application. The alarm system has been approved for testing in a larger scale and might yet be improved according to test results.