Engineering Design - Motorboat analysis, system condition monitoring and maintenance

Résumé du document

The reliability on a motorboat is always high, for instance, if you are in the middle of an ocean you don't want your engine to break down. And because the maintainability affects the reliability, the maintainability has to be easy, quickly accessible and possible everywhere. Nowadays, all parts of the engine are easily accessible, the hull is the only thing that is hard to repair when a failure occurs. However, the engine is more exposed to failure than the hull.

Extraits

[...] This maintenance is established by the experience and data about vibration, oil analysis and life length. The main checks are Check petrol pipes regularly to detect crack and worn signs. Check if there is water in the engine. Check the tanker's vent to see if they suck up well. Check all fasteners for tightness, torque to manufacturer specification. Clean and inspect throttle, shift, spark advance linkages, lubricate according to manufacturer recommendations. Check all connections for tightness. Change annually the gear lubricant. Change the Water pump impeller every two years. [...]

[...] If the motorboat is not used for a long time like in most cases in winter the boat has to be wintered. This operation can be done by the customer and consist of cleaning and lubricating actions. Corrective maintenance Most of the corrective maintenances have to be possible to do in the sea that is why the designers choose a modular design for the engine; hence a customer with the basic knowledge of repairing can make primary repairs to allow him to go in a safe place. [...]

[...] Due to the high number of regular maintenances, to the cost of maintenance and to the need of basic skills in repair for the customer: the designers tend to improve the speed and the efficiency of regular maintenances. In order to achieve this, they decided to increase the modularity, the reliability and the ease of access for every component. Bibliography Dhillon, Balbir S. (2006) Maintainability, Maintenance, and Reliability for Engineers, B. S. Dhillon (1999). Engineering maintainability, Gulf Publishing Company. K.C. Kapur, L.R. Lamberson Reliability in Engineering Design. [...]

[...] Permanent monitoring will avoid the second type of maintenance to occur. Condition Monitoring Condition monitoring is the process of monitoring a parameter of condition in machinery. The intention of condition monitoring is to provide some early warning of impending failure. It's a preventative maintenance technique to help determine the condition of in-service equipment in order to predict when maintenance should be performed. Techniques for condition monitoring can be divided into different categories according to the symptom or potential failure effecting they monitor. [...]

[...] On a motorboat monitoring can be divided in two parts: 1. The monitoring by the engineer: Test the eccentricity of shaft and propeller. Vibration analysis: too much vibration can damage ball bearing and unscrewed some important bolt. Test the torque using the manufacturer data The permanent monitoring: Pressure indicator light lacks of oil, the engines isn't enough lubricate. Heat indicator light (Red) →leak of oil or water. Power indicator light (Green) fail with the alternator belt. Fuel indicator light leak of petrol. [...]