tailieunhanh - Handbook of Machine Design P49

This chapter deals with the technologies of basic energy transmission systems as used by product- and process-oriented industries and the military establishment. Figure and Table illustrate the essence of these types of systems. These classes of energy transmission systems can be characterized as follows: I. Mechanical rotary input in the form of A. An input speed N1 which can be constant or variable | __CHAPTER 42_ LOAD-CYCLE ANALYSIS Russ Henke . Russ Henke Associates Elm Grove Wisconsin INTRODUCTION LOAD-DOMINATED ENERGY TRANSMISSION SYSTEM MACHINE-CYCLE ANALYSIS LOAD PLOTS REFERENCES GLOSSARY OF SYMBOLS A Area F Force or load N Normal force speed p Pressure Q Flow rate t Time T Torque v Velocity 0 Angular velocity jt Coefficient of friction Angular velocity INTRODUCTION This chapter deals with the technologies of basic energy transmission systems as used by product- and process-oriented industries and the military establishment. Figure and Table illustrate the essence of these types of systems. These classes of energy transmission systems can be characterized as follows I. Mechanical rotary input in the form of A. An input speed V which can be constant or variable B. An input torque T which is variable responding to the instantaneous demand of the energy transmission system . the output impedance of the prime mover STANDARD HANDBOOK OF MACHINE DESIGN FIGURE The energy transmission system is an interface between an input element such as a prime mover and an output element such as a load. The dashed lines indicate interfaces. From Ref. . TABLE Various Energy Transfer Systems as Interfaces between Input and Output Input or source Energy transmission system Output or load AC electric motors DC electric motors Spark-ignition internal-combustion engines Diesel engines Gas turbines Steam turbines Air motors Water motors 1. Electric systems 2. Mechanical systems 3. Fluid power systems Linear output Vq Fo Rotary output NQ To source Ref. . II. Mechanical output in two basic forms A. Linear 1. An output linear velocity v0 or x which can be constant or variable 2. An output force reaction Fo which can be constant or variable responding to the instantaneous changes in load reaction . the output impedance of the actuator B. Rotary 1. Limited-rotation actuators a. An .