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Unformatted text preview: No allowance was made for the extra volume needed to pressurize the accumulator. Fail-safe design is essential for an elevator to be used by the public. The control circuitry should be redundant. Failures must be easy to spot. For this reason, hydraulic actuation is good: leaks will be readily apparent. The final design must be reviewed, approved, and stamped by a professional engineer since the design involves public safety. The terminology used in the solution is defined in the following table: Symbol Definition Units p System pressure psig A p Area of lift piston in 2 V oil Volume of oil gal D s Diameter of spherical accumulator ft t Wall thickness of accumulator in A w Area of weld in 2 C w Cost of weld $ M s Mass of steel accumulator lbm C s Cost of steel $ C t Total Cost $ A sample calculation and the results of the system simulation in Excel are presented below. σ π t D S 4 2 S D p Results of system simulation:...
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This note was uploaded on 10/19/2011 for the course EGN 3353C taught by Professor Lear during the Fall '07 term at University of Florida.
- Fall '07
- Fluid Mechanics