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DESIGN OF MACHINERYAN INTRODUCTION TO THE SYNTHESIS AND ANALYSIS OF MECHANISMS AND MACHINES phần 8

Các chương trước đã thảo luận về thiết kế của cơ chế trượt quây như được sử dụng trong động cơ đốt trong xi-lanh đơn và bơm piston. Bây giờ chúng ta sẽ mở rộng thiết kế để multicylinder cấu hình. Một số trong những vấn đề với các lực lượng bắt và mômen xoắn có thể được giảm nhẹ bởi sự kết hợp thích hợp quây trượt nhiều mối liên kết trên một trục khuỷu chung. | 636 DESIGN OF MACHINERY CHAPTER 13 Answers in Appendix F. 113-4 A slider-crank linkage has r 4 and z 15 and a piston bore B 3. The peak gas pressure in the cylinder occurs at a crank angle of 5 and is 600 pressure units. Calculate the gas force and gas torque at this position. 113-5 Repeat Problem 13-3 using the exact method of calculation of gas torque and compare its result to that obtained by the approximate expression in equation 13.8b p. 613 . What is the percent error 113-6 Repeat Problem 13-4 using the exact method of calculation of gas torque and compare its result to that obtained by the approximate expression in equation 13.8b p. 613 . What is the percent error 113-7 A connecting rod of length I 12 has a mass rriỊ 0.020. Its mass moment of inertia is 0.620. Its CG is located at 0.4 1 from the crankpin point A. a. Calculate an exact dynamic model using two lumped masses one at the wrist pin point B and one at whatever other point is required. Define the lumped masses and their locations. b. Calculate an approximate dynamic model using two lumped masses one at the wrist pin point B and one at the crankpin point A. Define the lumped masses and their locations. c. Calculate the error in the mass moment of inertia of the approximate model as a percentage of the original mass moment of inertia. 113-8 Repeat Problem 13-7 for these data z 15 mass m3 0.025 mass moment of inertia is 1.020. Its CG is located at 0.25 z from the crankpin point A. 113-9 A crank of length r 3.5 has a mass m2 0.060. Its mass moment of inertia about its pivot is 0.300. Its CG is located at 0.30 r from the main pin point Ỡ2- Calculate a statically equivalent two-lumped mass dynamic model with the lumps placed at the main pin and crankpin. What is the percent error in the model s moment of inertia about the crank pivot. 113-10 Repeat Problem 13-9 for a crank length r 4 a mass m2 0.050 a mass moment of inertia about its pivot of 0.400. Its CG is located at 0.40 r from the main pin point Ơ2-