TAILIEUCHUNG - Handbook of Mechanical Engineering Calculations P21

TRANSMISSIONS, CLUTCHES, ROLLER-SCREW ACTUATORS, COUPLINGS, AND SPEED CONTROL Constructing Mathematical Models for Analyzing Hydrostatic Transmissions | Source HANDBOOK OF MECHANICAL ENGINEERING CALCULATIONS __SECTION 21 TRANSMISSIONS CLUTCHES ROLLER-SCREW ACTUATORS COUPLINGS AND SPEED CONTROL Constructing Mathematical Models for Analyzing Hydrostatic Transmissions Selecting a Clutch for a Given Load Clutch Selection for Shaft Drive Sizing Planetary Linear-Actuator Roller Screws Designing a Rolling-Contact Translation Screw Selection of a Rigid Flange-Type Shaft Coupling Selection of Flexible-Coupling for a Shaft Selection of a Shaft Coupling for Torque and Thrust Loads High-Speed Power-Coupling Characteristics Selection of Roller and Inverted-Tooth Silent Chain Drives Cam Clutch Selection and Analysis Timing-Belt Drive Selection and Analysis Geared Speed Reducer Selection and Application Power Transmission for a Variable- Speed Drive CONSTRUCTING MATHEMATICAL MODELS FOR ANALYZING HYDROSTATIC TRANSMISSIONS Construct a mathematical model of vehicle performance for a construction vehicle powered by a hydrostatic transmission when the vehicle is driven by a 45-hp engine at 2400 rpm with a high idle-speed of 2600 rpm. The vehicle has a supercharge pump rated at 2 hp kW . Other vehicle data are loaded radius rL in cm gross vehicle weight W4 8500 lb 3825 kg weight on drive wheels Ww 5150 lb 2338 kg final drive ratio Rfd 40 1 coefficient of slip Cs and coefficient of rolling resistance Cr 60 lb 1000 lb kg 454 kg of gross vehicle weight. The vehicle is powered by a hydrostatic transmission with a rev 41-mL rev displacement pump rated at 5000 lb in2 . Compare the performance produced by using a rev 41-mL rev displacement fixed-displacement motor and a rev 41-mL rev displacement variable-displacement motor with an 11-degree displacement stop. Other pump and motor data are given on performance curves available from the pump manufacturer. Downloaded from Digital .

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