Design of Pedal Driven Unit: An unconventional alternative Energy Source

Transcription

1 Design of Pedal Driven Unit: An unconventional alternative Energy Source M. S. Giripunje 1, Dr. C. N. Sakhale, S. K. Undirwade 3, S. N. Waghaare Abstract Increasing load shedding, insufficiency of electricity, increase of electricity bill charges & poor people ratio in our country has forced us to think in the direction of utilization of an-power in process achines instead of usual electrically operated achines. Now-a-day a person has to exercise daily on the exercise achine (to keep hiself physically fit) and. So if a person exercise or work out on this pedal driven unit then it can generate Power about 1HP which (if we use heavy Flywheel, power can be aplified up to 5 HP) can run the household achine like water pup, electricity generation achine, washing achine etc. So, the present work is on Pedal Driven Unit which coprises a Bicycle echanis, Flywheel, appropriate clutch for transission & process unit could be any process device such that product quality does not get affected on account of variation in speed of process unit. Keywords: Pedal driven unit, Bicycle echanis, process unit. 1. Introduction Today s India is facing treendous proble of load shedding & power cuts. Many ore countries are also facing proble of liited on earth are ending & of course these are out of reach of coon an as these are costly. We can t use the energy available in the for of power (electricity) whenever we need due to load shedding. Generally, A person can generate four ties ore power by pedaling than by hand-cranking.if a person pedals with his full capacity then continuous pedaling can be done for only short period of about 10in. However pedaling at half power can be sustain for around 60in. Pedal power enable a person to drive device at sae rate as that achieved by hand-cranking but with far less effort & fatigue. So, In this work we use pedaling echanis to generate the power and store the energy in flywheel by using the proper gear ratio & then flywheel runs any process unit. Fig. describes scheatic arrangeent of such Pedal Driven unit which coprises a Bicycle echanis.. Objective of the Proposed Work The energy sources of such types are considered as one for of non- conventional energy source. The iportance of this work is for the reote and interior area for energizing process unit in the range up to 5 Hp. For this range, large nuber of process achines is required to be energized []. For sall farers, it is necessary to adopt this concept to sall agricultural ipleents. Accordingly this type of energy source has been adopted for several processes such as keyed bricks, wood turning, algae foration achine, fodder chopper, oilseed presser [3,4,5,6,7]. Such an energy source if developed and utilized, it will be of great help to poor people / people in villages [1], firstly because it does not need conventional energy and it ay generate work for one of the faily eber. A large area around the vicinity of big cities in Asian countries is a rural area and alost all rural areas in India are affected by load shedding which greatly hapers the daily needs, growth and developent of these rural areas. If the society focuses its research work on replacing the electricity driven process units 118

2 by huan power, then it will be of great help to such rural areas for the overall growth and developent. Also it ay generate eployent for the poor people/ people in villages for their self dependence..1 Huan Power Output The axiu power output fro a huan being occurs in a rowing action because ost uscle groups in the body are used. However, these outputs are loosely approached by those obtained fro the legs applied to oving pedals. Little advantage appeared to be gained fro pedal otions other than siple rotating cranks as on a bicycle and use of cranks gives a fairly sooth rotary otion at speeds of rp. Hand cranking is frequently used but as the ar uscles are saller than the thighs, power output is reduced. The power output to be expected fro noral peddlers are around 0.1HP.This output can be aintained for 60 inutes or ore. Higher outputs can be produced for shorter periods. In static applications, the outputs available tend to be lower than those easured fro the perforance of cyclists because of the effect of winds in reducing body teperature. It ay prove advantageous to provide fans for peddlers in static situations to iprove output. How fast should a person pedal? Huan beings are very adaptable and can produce power over a wide range of pedaling speeds. However, people can produce ore power--or the sae aount of power for a longer tie--if they pedal at a certain rate. This rate varies fro person to person depending on their physical condition, but for each individual there is a pedaling speed soewhere between straining and flailing that is the ost cofortable, and the ost efficient in ters of power production. (For centuries, this fact was apparently not recognized.) The predoinant ethod of huan power production was to strain with axiu strength against a slowly yielding resistance. This is neither cofortable nor efficient. Neither is the opposite extree of flailing at full speed against a very sall resistance. A siple rule is that ost people engaged in delivering power continuously for an hour or ore will be ost efficient when pedaling in the range of 50 to 70 revolutions per inute (rp). See Fig. 1, Fig. and Fig. 3. For siplicity's sake, we will use 60 rp, or one revolution of the pedal crank per second, as an easy reference value for estiates of the gear ratios required to drive a given load.. Power Levels The power levels that a huan being can produce through pedaling depend on how strong the pedaler is and on how long he or she needs to pedal. If the task to be powered will continue for hours, at a tie 75 watts echanical power is generally considered the liit for a larger, healthy non-athlete. A healthy athletic person of the sae build ight produce up to twice this aount. A person who is saller and less well nourished, but not ill, would produce less; the estiate for such a person should probably be 50 watts for the sae kind of power production over an extended period. The graph in Fig. 3 shows various record liits for pedaling under optiu conditions. The eaning of these curves is that any point on a curve indicates the axiu tie that the appropriate class of person could aintain the given average power level. Fig. 1 Variation of optiu pedaling rate with desired power output.3 Pedaling Rate 119

3 Fig. Huan Power Output Peddling (Fro Bicycling Science II Edition, F. R. Whitt, D. G. Wilson, MIT Press) Fig. 3 Variation of sustained level of power with tie to exhaust 3. Design of Main Coponents 3.1 Flywheel W k g Ks Ks = Coefficient of speed Fluctuation. E = The axiu fluctuation of energy. k = Radius of gyration = {0.1[Do + (Do h) ]} 1/ = ean velocity in radians/second h = ri thickness b = ri width Applying Sokolowski s forula to calculate grinding energy per kg of food grain [8, 9, 10, 11, 1, 13, 14], Energy required for grinding (E) is given as: 1 1 E K d D d = particle size after grinding, D = particle size before grinding K = grinding index Let us consider one of the hard quality of wheat (Ardente) for which the value of grinding index K = 47KJkg-11/ Considering the initial size of wheat, D = 5 And the iniu flour particle size, d = E = KJ/kg Consider that, during one cycle, [utilizing the energy stored in flywheel after one inute of peddling], we have to grind 0.5 kg of wheat. Energy required for grinding 0.5 kg of wheat, = 84.07/ =4.035 KJ = 4035 J E = 4,035 J 1 1 I I Nax Nin Ks N ax in ean W k g Ks = k K ω s =IKsω I = Moent Of Inertia of Flywheel. E = 4,035 J, Ks =, rad/sec IK E = sω 4,035 = I (41.866) I = kg- 10

4 We consider, I = 1 kg- Assue D = flywheel ean diaeter = 0.98 k = 0.49 Assuing that the ri provides 95 percent of the required oent of inertia, k = 0.95 I = =11.4 =11.4/ k = 11.4/0.49 = kg Other diensions of flywheel: b = 100, h = 19.7, Do = 1000, No. of ars = 6. Stresses in the flywheel: Centrifugal stress = MPa, Bending stress = MPa, resultant stress = MPa. 3. Chain Drive Rated Power, PR= 900 W Design Power (Pd) : Pr K1 K1 =Load Factor, fro design data book it should be 1. for oderate shock and service of 10 hours per day [1, 13, 14]. Pd = =1080 W =1.44 hp Speed of saller sprocket = 10 rp. Fro design data book graph, Select chain No. 50 for which Pitch (p) = The chain sprocket with the 4 teeth on the saller sprocket and 48 teeth on the larger sprocket is available in the arket. Pitch Diaeter of saller Sprocket (Dp) p D p= 180 sin T T = No. of teeth on saller sprocket = D p = sin =106.5 Pitch Line Velocity (Vp) : Vp= ( Dp N)/60 = ( )/60 Vp = 0.66 /sec Power capacity per strand: 1.41 V V P p 6 5cos T p= chain pitch=15.875, V = Vp =0.66/sec, T =T = P cos P = 175.6W No. of strands = 1080/175.6 =0.84 No. of strands =1 Tooth Load (Ft) = Pd/Vp = 1080/0.66 = N Other diensions: Pitch diaeter of larger sprocket = 3.17, Center distance C = 10.8, Recoended Cin = 85.4, Length of chain in pitch Lp = 7.75, Outer Diaeter of the saller sprocket = = , Outer Diaeter of the larger sprocket = 51.73, Width of the sprocket Gear Design (Stage 1) Pd = 000 W, Module =, pitch diaeter, Dp=0, Vp = , Ft = Pd/Vp = 000/ = / Assuing 1045 steel with heat treatent, So= 10 MPa, [1, 13, 14]. Bending strength, Fb = So.Cv.b.Y. = = Basic strength, So = 10 MPa Velocity factor, Cv=0.3 (trial value) Face width of gears, b= 10 (trial value.) Modified Lewis for factor, Y = /tp = /0 = Fb = Equating Fb = Ft, = /, =.3, select odule, = 3. Dp =.tp = 3 0 = 60. After calculation, the actual values of Vp, Cv & Ft are as follows: Vp=.5119 /sec, Cv = 0.544, Ft = N Calculated diensions for other gears Pinion Gear =3 =3 T=0 t=80 Dp=60 Dp= Bearing 11

5 For shaft 1: The horizontal and vertical coponents of the reactions at two bearings B1 & B are already calculated while designing the shaft. The reactions at two bearings are given by: R B1= R DH +R DV = = N R B = R BH +R BV = = N The expected bearing life (L10) : 60 n L10h L 10 = 6 10 [1, 13, 14]. n = speed of rotation of shaft= 00 rp. L10h = Expected bearing life = 0000 hours ( for the achines used for eight hours of service per day ) L10 = ( )/106 = 40 illion revolutions. The dynaic load carrying capacity (C1 & C): Load factor = 1.5 (for Chain Drive) C1 = P1 [L10]1/3(Load Factor) Considering no axial load, P1 =RB1= N C1 = /3 1.5 = N C = P [L10]1/3(Load Factor) Considering no axial load, P =RB= N C = /3 1.5 = N For the Shaft diaeter 5 following Bearings are available: i) No (C =310 N), ii) No (C = 7610 N), iii) No (C =1100 N) For required dynaic load carrying capacity, Bearing No is suitable at B1 & B. Other diensions of the bearing: Inner diaeter of the bearing = 5, Outer diaeter of the bearing = 47, Axial width of the bearing = 1. Siilarly by calculations, Bearings available for shaft and 3, i) No (C =310 N), For shaft 1 ii) No (C = 1100 N), For shaft iii) No (C =13300 N) For shaft 3 For required dynaic load carrying capacity, Bearing No is suitable at B3 & B4. Other diensions of the bearing: Inner diaeter of the bearing = 30, Outer diaeter of the bearing =55, Axial width of the bearing = Conclusions 1) The energy sources of such types are considered as one for of non- conventional energy source. ) Such an energy source if developed and utilized, it will be of great help to poor people / people in villages, as it does not need conventional energy. 3) In countries like India where aple huan power is available, such huan powered an achine systes will help in a great extend to iprove the econoical condition and eployability of such countries. 4) Such systes are of utost iportance in Asian countries as alost all Asian countries are facing electricity scarcity which results in ten to twelve hours load shedding in rural/undeveloped areas. References [1] Modak, J. P. et all, Manufacturing of Liefly ash-sand bricks using anually driven brick aking achine, a project sponsored by Maharashtra Housing & Area Developent Authority, (MHADA), Bobay, India. [] Modak, J. P., et all, Influence of developent and huan powered process achine and its ipact on energy anageent of rural and interior sector, Proceeding of National Conference on Energy Manageent in Changing Business Scenario, (EMCBS 005), 8-9 October 005, BITS Pilani. [3] Sohoni V.V., H. P. Aware and Modak J. P Manually Powered Manu-facture of Keyed Bricks Building Research & Inforation, U.K. Vol. 5, N6, Pp , 1997 [4] Modak, J. P. and Bapat, A. R, Manually driven flywheel otor operates wood turning process Conteporary Ergonoics, Proc. Ergonoics Society Annual Convention April, Edinburgh, Scotland, pp , 1993 [5] Modak, J. P. and Katpatal A.A., Design of Manually Energized Centrifugal Dru Type Algae Foration Unit Proceedings International AMSE Conference on Syste, Analysis, Control and Design, Layon (France), Vol. 3, 4-6 July 1994, pp 7-3. [6] Zakiuddin K. S. and Modak, J. P., Application of pedal operated flywheel otor as an energy source for fodder chopper International Journal of Agricultural Engineering, Vol. 3 Issue pp 51-56, Oct

6 [7] Dhale A. and Modak, J. P., Forulation of the approxiate generalized data based odel for oilseed presser using huan powered flywheel otor as an energy source International Journal of Agricultural Engineering, [1] Zakiuddin K. S. and Modak, J. P., Application of pedal operated flywheel otor as an energy source for fodder chopper International Journal of Agricultural Engineering, Vol. 3 Issue pp 51-56, Oct. 010 [8] Dariusz Dziki,Janusz Laskowski Influence of wheat grain echanical properties on grinding energy requireents,teka Ko. Mot. Energ. Roln., 006,6A,56-64 [9] Dariusz Dziki, Janusz Laskowski, Infuence of selected factors on wheat grinding energy requireents TEKA Ko. Mot. Energ. Roln., 005,56-64 [10] Dariusz Dziki, Janusz Laskowski, The energy consuing indexes of wheat Kernel Grinding process. [11] E.Beshada,M.Bux,T.Waldenaier Design and Optiisation of a Photovoltai powered Grain Mill,Agricultural Engineering International:the CIGR Ejournal [1] Shiwalkar B. D. Design of Machine Eleents Denett & Co., India. [13] Shiwalkar B. D. Design Data For Machine Eleents Denett & Co., India. [14] Bhandari V. B. Design Of Machine Eleents Tata McGraw Hill Publication, India. 13