ItemFailure ModeCauseLocal-SystemEffectRisk Priority RatingRecommended ImprovementRisk Priority Rating

SevProbDetRPNSevProbDetRPN

Navigation mechanismMotor does not work properly Wrong connections to the boardFailure in achieving the minimum goals.

32424Check connections carefully follow guidelines if necessary.3139

Propeller unable to push the watercraft

Propeller being too weak 3126Choose a suitable propeller based in calculations and estimations.3113

Unable to avoid walls and change direction.

Wrong connection or programing of the navigation sensorWrong performance of the servo

Very low probability of collecting the box.23530Design a novel Arduino code to optimize performance.Make sure connections are well done.Calibrate and test the servo.22416

ChassisPresents filtering holesPoor material selectionPossible damage of the componentsA waste of all the other efforts.4114Put special emphasis in the design and the workshops assuring that the structure and material accomplish with their functions.4114

Unable to hold all the componentsPoor design 42184114

Power SupplyDoes not provide energy suitablyIncorrect calculation and or connection.Prototype remains useless.Imposibility of determining if the other components are functional.32318Test previously with the same sort of power supplies.Have more than one item.3126

DetectionSensorDoes not detecting the boxWrong wire-connection.Detection interruption.Principal objective unachieved

24540Make sure the sensor is well installed and connected with previous test.

2248

Wrong calibration

Gripping mechanismUnable to collect the boxMistakes in the designImpossibility to return the black box23318Check and test the design many times estimating the possible setbacks and implementing the way to overcome them in the design.2228

Arduino UnoSends wrong commands to the componentsNot functional codePrototype behaving unexpectedly.

33545Create a good code test it and verify that it gives the correct commands for every single signal32530

The prototype was divided into 6 main parts (items) to be analyzed with the FMEA method, the values for severity probability and determination ratings were graded according to the tables. From the analysis the item with the highest RPN indicator (45) is the Arduino Uno controller. Therefore there are some improvements planned in order to avoid a failure of this item, which could be dangerous for the assessment marks and the total performance of the prototype. With those, the team could reduce its RPN indicator to two thirds its original value (30), which is much better in terms of performance of the project. Also there were some improvements implemented to the other items for the same reason. To ensure security no toxic substances are going to be used as materials, a determination of that was made with a comparison to the HSIS (Hazardous Substances Information System) consolidate list. Moreover safety protocols will be followed in each part of the development of the project in order to assure all the safety precautions are taken.

Table 1: These tables outline the weighting of different criteria used in the FMEA and Risk Analysis.Severity

IndicatorMagnitude

1No effect

2Marks or economic loss

3System does not work

4System is damaged

5Injuries or life thead

Probability

IndicatorMagnitude

1Not probable

2Hardly probable

3Probable

4High probability that happens

5Certain

Determination

IndicatorMagnitude

1Evident

2Needs careful observation

3Needs to be touched or analyzed

4Needs to be dissemble or opened

5Needs to be tested