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| report [2020/06/23 02:11] – [7.3 Components] team1 | report [2021/03/23 10:55] (current) – external edit 127.0.0.1 |
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| <WRAP box 800px center> | <WRAP box 800px center> |
| ^ Component ^Material^Link ^Price per unit^ Final price^ | ^ Component ^Material^Link ^Price per unit^ Final price^ |
| |{{:bolt.jpg?400|}} {{:nut.jpg?400|}}| Stainless steel |[[https://www.alibaba.com/product-detail/Factory-price-stainless-steel-304-316_60658500131.html?spm=a2700.galleryofferlist.0.0.156c84e74utjVv|Bolt and nut]]| 0.03€| 0.45€| | |{{:bolt.jpg?400|}} {{:nut.jpg?400|}}| Stainless steel |[[https://www.alibaba.com/product-detail/Factory-price-stainless-steel-304-316_60658500131.html?spm=a2700.galleryofferlist.0.0.156c84e74utjVv|Bolt and nut]]| 0.03 €| 0.45 €| |
| |{{:spring.jpg?400|}}| Stainless steel| [[https://www.alibaba.com/product-detail/helical-disc-M6-M10-M12-conical_1600055798583.html?spm=a2700.7724857.normalList.89.3bcd529dYJxXwv|Spring washer]]|0.02€| 0.30€| | |{{:spring.jpg?400|}}| Stainless steel| [[https://www.alibaba.com/product-detail/helical-disc-M6-M10-M12-conical_1600055798583.html?spm=a2700.7724857.normalList.89.3bcd529dYJxXwv|Spring washer]]|0.02 €| 0.30 €| |
| |{{:washer.jpg?400|}}|Stainless steel| [[https://www.alibaba.com/product-detail/Stainless-steel-din-9021-M5-304_60815554551.html?spm=a2700.galleryofferlist.0.0.40a32428p1FuhF|Flat washer]]|0.02€| 0.6€| | |{{:washer.jpg?400|}}|Stainless steel| [[https://www.alibaba.com/product-detail/Stainless-steel-din-9021-M5-304_60815554551.html?spm=a2700.galleryofferlist.0.0.40a32428p1FuhF|Flat washer]]|0.02 €| 0.6 €| |
| |{{:plasa.jpg?400|}}|PMMA |[[https://www.amazon.com/Annie-Lightweight-Parrot-Fabric-18x54ParrotBl/dp/B072Z71VQH/ref=sr_1_7?dchild=1&keywords=nylon+mesh+netting&pd_rd_r=18c7b827-ec96-4eac-ac66-302fed4e3084&pd_rd_w=ludRT&pd_rd_wg=Na1pR&pf_rd_p=ff875a9e-7810-43da-bae9-ec4c363817ac&pf_rd_r=ZDBN1JCAM7QWJJ37EMPD&qid=1591919485&sr=8-7|Nylon mesh]]| 8€| 8€| | |{{:plasa.jpg?400|}}|PMMA |[[https://www.amazon.com/Annie-Lightweight-Parrot-Fabric-18x54ParrotBl/dp/B072Z71VQH/ref=sr_1_7?dchild=1&keywords=nylon+mesh+netting&pd_rd_r=18c7b827-ec96-4eac-ac66-302fed4e3084&pd_rd_w=ludRT&pd_rd_wg=Na1pR&pf_rd_p=ff875a9e-7810-43da-bae9-ec4c363817ac&pf_rd_r=ZDBN1JCAM7QWJJ37EMPD&qid=1591919485&sr=8-7|Nylon mesh]]| 8 €| 8 €| |
| |{{:sarma.jpg?400|}}|Stainless steel| [[https://www.aliexpress.com/item/32951847244.html?spm=a2g0o.productlist.0.0.64497d698yPgMm&algo_pvid=5fbd5c9e-b69c-481f-95e6-6d85cd9bbc88&algo_expid=5fbd5c9e-b69c-481f-95e6-6d85cd9bbc88-11&btsid=0ab6f82315919948041317534e0d9c&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_|Nylon mesh]]|6.85€/5 meters| 0.685€| | |{{:sarma.jpg?400|}}|Stainless steel| [[https://www.aliexpress.com/item/32951847244.html?spm=a2g0o.productlist.0.0.64497d698yPgMm&algo_pvid=5fbd5c9e-b69c-481f-95e6-6d85cd9bbc88&algo_expid=5fbd5c9e-b69c-481f-95e6-6d85cd9bbc88-11&btsid=0ab6f82315919948041317534e0d9c&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_|Nylon mesh]]|6.85 €/5 meters| 0.685 €| |
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| === - Fluid mechanics === | === - Fluid mechanics === |
| In the process of developing a product that operates in a lake, it is necessary that we consider the mechanics of fluids and the forces on them. | In the process of developing a product that operates in a lake, it is necessary to consider the mechanics of fluids and the relevant forces. |
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| == - Overview == | == - Overview == |
| Archimedes' principle states that any object, wholly or partially immersed in a fluid, is buoyed up by a force equal to the weight of the fluid displaced by the object. | Archimedes' principle states that any object, wholly or partially immersed in a fluid, is buoyed up by a force equal to the weight of the fluid displaced by the object. |
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| An object floats when the weight force on the object is balanced by the upward push of the water on the object. The upwards push of the water increases with the volume of the object that is underwater; it is not affected by the depth of the water or the amount of water. | An object floats when the weight force on the object is balanced by the upward force of the water on the object. The upwards force increases with the volume of the object that is underwater; it is not affected by the depth of the water or the amount of water. |
| If the weight force down is larger than the upward push of the water on the object then the object will sink. If the reverse is true then the object will rise. | If the weight force is larger than the upward push of the water on the object then the object will sink. If the reverse is true, then the object will rise above the waterline. |
| Different objects float at different levels in the water because as most regular objects are lowered into the surface of the water, the upward push of the water steadily increases until it is in balance with the weight force of the object, and the object then continues floating at this level with the two forces in balance. | Different objects float at different levels in the water because, as most regular objects enter the water, the upward push of the water steadily increases until it is in balance with the weight force of the object, and the object then continues floating at this level with the two forces in balance. |
| Many objects that are hollow (and so generally contain air) float because the hollow sections increase the volume of the object (and so the upwards push) for very little increase in weight force down. However, it is not necessary for an object to contain air in order to float. | Many objects that are hollow (and so generally contain air) float because the hollow sections increase the volume of the object (and so the upwards push) for very little increase in weight force down. |
| No object can float without some part of it being below the surface of the water[(floatingsinking)]. | No object can float without some part of it being below the surface of the water[(floatingsinking)]. |
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| If the water level stays at the very top of the inner bin, this implies that the overall weight of the bin is the same as the weight of the water that the bin displaces. | If the water level stays at the very top of the inner bin, this implies that the overall weight of the bin is the same as the weight of the water that the bin displaces. |
| The volume of displaced water consists of the volume of the body submerged, the volume that the pump occupies, and the volume of air inside the body (where the water is falling in like a waterfall). It will also be consider the last-mentioned volume because it is not desired to be filled with water, but with air, so it is also a volume of displaced water. | The volume of displaced water consists of the volume of the body submerged, the volume that the pump occupies, and the volume of air inside the body (where the water is falling in like a waterfall). This latter volume is considered because it is not desired to be filled with water, but with air, so it is also a volume of displaced water. |
| The volume of displaced water is around 47000000 mm<sup>3</sup>, so around 47 liters. The density of water changes with temperature and, very slightly, with pressure. However, its density is approximately 1 g/cm<sup>3</sup>, meaning that 47 liters are equal to 47kg. | The volume of displaced water is around 47 000 000 mm<sup>3</sup>, so around 47 liters. The density of water changes with temperature and, very slightly, with pressure. However, its density is approximately 1 g/cm<sup>3</sup>, meaning that 47 liters are equal to 47 kg. |
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| These 47kg need to be balanced by a body that weighs 47kg. Without an extra weight to balance this, the product weighs around 16.5kg. By adding a small body of water that would allow the pump not to run dry, another 4.5kg is added. To balance the remaining mass, a 26kg body of steel is added to the bottom of the body. | These 47 kg need to be balanced by an equal weight. Without an extra weight to balance this, the product weighs around 16.5 kg. By adding a small body of water that would allow the pump not to run dry, another 4.5 kg is added. To balance the remaining mass, a 26kg body of steel is added to the bottom of the body. |
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