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  • Users: Allen3
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  1. Allen3

    Effect of ripple load on Li-ion battery

    I'm investigating the design of a bi-directional switching DC-DC converter that will be connected to a Li-ion battery. The goal is to make the switching frequency relatively high, in the range of 50-100 KHz. Due to the switching, the converter will place a load on the Li-ion battery that...
  2. Allen3

    Bearing in wrist pin

    I'm designing a machine with a moving joint that looks and functions exactly like the joint between a piston and its connecting rod in reciprocating engine. My thought is that I would use the same type of bearing. AFAIKT, a typical engine will attach the piston to the connecting rod using...
  3. Allen3

    "twisting" force on shaft in journal bearing

    This is kind of a newbie question. Let's say I have a horizontal shaft perfectly aligned in a journal bearing, and at running speed, the bearing is capable of carrying a load of 1000 pounds-force, and by that I mean that I can put 500 pounds of downward force on each end of the shaft, for a...
  4. Allen3

    minimize inefficiency in partial-admission turbine

    This is a question about aerodynamic friction in the context of a partial-admission impulse turbine. The working fluid will be air or some other gas. In this particular turbine, the buckets will be U shaped and will be symmetric, i.e., if the rotor were simply spinning by itself in the air, it...

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