Design and Selection of Bearing
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Added on 2021-04-24
Design and Selection of Bearing
Added on 2021-04-24
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Design and Selection of Bearing for the Wave Energy converterPrepared By:Dated:
1.INTRODUCTION There is increased need for sustainable energy conversion. In this report, discussion iscentred on the design and selection of bearing. Additionally, the design also considersminimum maintenance requirements. Referring to this new technology, it is at an advanced stage of commercialization; nevertheless, it presents a robust harnessing strategy of oceanic tidal energy. It comprises a float with an arm connecting to the level that provides actuation to the piston pump. The power to be generated would often depend on the magnitude and frequency of the tidal waves. Averagely, it assumed, for the purpose of bearing design, that the wave height is 4m and it is detected after every 5seconds. Once perceived by the floating mechanism, the hydraulic power is transformed into mechanical power via a mechanical system comprising the rigid arm, level and piston and of course the bearing, which provides relative rotational motion for the pump to be actuated. The mechanical power is again transformed into electrical power via generators. In this case, the focus is on the design and selection of the bearing (Khurmi and Gupta, 2005). The aim is to design a bearing that would withstand the oceanic conditions and facilitate minimum maintenance as it is always costly to undertake regular overhaul for the bearing replacement. The type of bearing selected in this case is the journal bearing that exhibits the simplest working mechanism and fit to operate in such an environment (Khurmi and Gupta, 2005).
1.DESIGN AND SELECTION The following refers to the data that was provided for the purpose of design. It should be noted that in cases where some parameters are not provided, a relevant assumption is made with a justification for the same. Table 1: Design dataPARAMETERVALUE (Given ) Calculated Value Area around floater4m2-Arm length 3m-Lever length 1.5m-Wave height 0.4m-Intervals between waves5sec-Force on piston4000N-Force applied by float2000N-Mass of system250kg-Wear on bearingNot more than 1mmElectrical Power1500kW2.2Bearing Design It should be noted that the total electrical power being produced is 1500kWThe system is composed of 10 floats, with uniform energy conversion capacity hence:Each unit therefore must generate about 1500/10= 150kWLet us assume hydraulic and mechanical efficiencies of 87% and 79% respectively given most pumps and generator operate at this range. Hence overall efficiency= 0.87 x 0.79= 0.6873 Hydraulic power = 150/0.6873= 218.245kWTotal Weight of components is given by W= mg= 250x10= 2500NThe resultant force Fr= 2500+2000+4000-2500/2= 7250NTorque on bearing= Fv x L2= 7250 x 3 = 21.75kNmRocking speed is given by Wave height/time+ correction factor for reliability= 0.4/5+0.0045= 0.0845m/s
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