8/15/2023 0 Comments Monark cycle ergometer![]() Now that the kilojoules has been determined, the minimum input power can be converted into the units for work based on the relationship for kilograms per meter (Kgm) and kilojoules (KJ). The first step in solving this problem is converting the minimum power input from Watts into Kilojoules so that it can be converted into the units for work. Knowns: Watt = 8W, seconds = 60s, coefficient of rolling resistance (Crr) = 0.005, Normal force (N) = 1.1Kg, applied force (F) = 12Kg, x = 60 rpm, time (t) = 1min Unknowns: kilojoules (KJ), work (Kgm), wheel circumference (D), wheel diameter (d) The coefficient of rolling resistance (Crr) based on production bike tires at 31mph measured on rollers is: 0.005 The max applied force based on previous cycle ergometer models is: 12Kg Knowing this then the equation for work can be used to determine the circumference and thus the diameter that the wheel needs to be.Īssumptions: the main wheel of the machine is a disc wheel with a mass of: 1.1Kg īased on previous cycle ergometer models the minimum power needed to power on the machine is: 156W at 60rmp Question: Find the minimum diameter that the wheel can be in order to power the cycle ergometer at max applied forceįig 1: Assumed forces acting on the wheel of the cycle ergometerīackground: Knowing what the minimum input wattage it takes to power the cycle ergometer, it is possible to use the conversion relationships for wattage and Kilojoules and Kilojoules and work to convert wattage into the minimum workout output needed to power the machine. Determining the optimized size of this wheel allows for adjecent compoenets to be appropriately designed so that the cycle ergometer is as compact as possible but still fully functional. The wheel is the main component of a cycle ergometer machine since it is the component that is being used to measure work output. The unknown being solve for is the size of the wheel since this will give a known distance that the user has “travelled” per revolution and thus the equation for work (Work = Force*Distance) can be applied to find the unknown. The motivation for this is that a smaller wheel allows for the machine to be more compact, lighter, and more portable allowing for greater home or clinical use ![]() An engineering problem in designing a cycle ergometer is determining the optimal size of key components like the wheel and thus the overall machine. When designing a cycle ergometer for repeated exercise usage it is improtant to think about what are the key components of the machine, the intended usage, how closely the machine can simulate road bike cyclig, storage, and the impact of that the device can have on the user and their exercice. Cycle ergometers are a common type of ergometers used for cardio-pulmonary exercieses and sports medicince diagnostic and performance testing which uses the task of cycling. ![]() This work outuput can be used to determine how much power has been produced and how much metabolic energy has been consumed. The basic principle of any ergometers is to measure the distance traveled in relation to an applied force to output the work that has taken to perform that task. Monark Ergometer 879E Monrk Ergomedic 839E
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