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Sổ tay tiêu chuẩn thiết kế máy P49

Tham khảo tài liệu 'sổ tay tiêu chuẩn thiết kế máy p49', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | __CHAPTER 42_ LOAD-CYCLE ANALYSIS Russ Henke P.E. Russ Henke Associates Elm Grove Wisconsin 42.1 INTRODUCTION 42.1 42.2 LOAD-DOMINATED ENERGY TRANSMISSION SYSTEM 42.4 42.3 MACHINE-CYCLE ANALYSIS 42.5 42.4 LOAD PLOTS 42.7 REFERENCES 42.9 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 42.7 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 42.1 and Table 42.1 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 i.e. the output impedance of the prime mover 42.1 42.2 STANDARD HANDBOOK OF MACHINE DESIGN FIGURE 42.1 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. 42.1 . TABLE 42.1 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. 42.1 . 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 i.e. the output impedance of the actuator B. Rotary 1. Limited-rotation actuators a. An .