Recent content by jeffc0987

  1. J

    Optimizing Solar Panel and Battery Setup for a 24/7 Pump System

    I have measured the Ah draw that the pump needs (Assume in this case to be simple it draws 2Ah). The problem is figuring out how many solar panels I would need to supply this current. I will be using a voltage regulator to supply 12V to the motor. I have also stated the amount the sun...
  2. J

    Optimizing Solar Panel and Battery Setup for a 24/7 Pump System

    Right now I am working on a small pump that is capable of running on solar power for 24 hours a day. So far, I have solar panels with specs at typical irradiance/temp of 1000Wm^-2 and 25C: Pmax = 135 W Vpmax = 17.7 V Ipmax = 7.63 A Voc = 22.1 V Isc = 8.37 A Area = 1m^2 and batter(ies) with...
  3. J

    How to Calculate Average Power of a Train Pulling an Object on a Slope

    Few more relative equations Power is the change in work over the change in time. Work is the force multiplied by the displacement. Finding the force required to move it, the distance the train travels, and the time it takes the train to travel that far should get you to your answer pretty...
  4. J

    Statics question: when do I need to find the support reactions?

    I know in the method of joints there are certain joints that can be ignored called "zero force members" as the name implies. Since the question is so general I'm not sure if this is at all what you are looking for. Theres plenty of reference material on the internet to help you out though I am...
  5. J

    Egg Safety Vehicle (Egg Drop Project in a car)

    I'd suggest a harness inside for the egg suspended with rubber bands to the sides of the frame. Gotta make sure they are tight enough to keep it suspended away from the walls when falling down the stairs though. I've seen things kinda like this before for egg drops. I'd say focus on offense...
  6. J

    Best MS Student Calculator for 3rd Year Mech Eng Student

    I always regretted not buying a TI-89. When I went to thermo tutorials the guy who led them would put programs on everyones calculators that would solve problems that were almost guaranteed to show up on the test. It would literally ask what information you were given and spit out step by...
  7. J

    Max Horizontal Force: Calculate with Cam Setup & Motor Torque

    I'm still having trouble with this problem because testing shows this setup (picture attached) can produce up to ~150lb. of force using 84 lb*in of torque. This seems way too high--shouldn't it only be able to produce near that amount of force in the X direction when phi=90 and the entire force...
  8. J

    Max Horizontal Force: Calculate with Cam Setup & Motor Torque

    I am having to figure out the maximum horizontal force our cam is able to produce on a pushrod that slides back and forth through bushings. I have attached a picture showing the basic setup. The motor torque, and RPM's are known and for this estimate I am ignoring frictional forces. I'm...
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