上海交通大学：《Design and Manufacturing》课程教学资源（作业）07_Homework cam solutions

ME 371 cam Homework 07 Due in class on NOV.3,2014 CID: Name: Please use A4 size paper and staple them together. Problem1: Find the pressure angle at the point D of following cam mechanisms 3 y serairbe offset Cirde Problem 2: In Fig.P6.5,the displacement-time,velocity-time,and acceleration-time curves are sketched for a follower.The cam rotates at a constant angular velocity and the maximum(peak)value of the acceleration is 5 units.The equation for the acceleration-time curve is as follows: A= B sin (a)Write the equations for the velocity-time and displacement-time curves. (b)Determine the maximum values of displacement and velocity

ME 371 cam Homework 07 Due in class on NOV. 3, 2014 CID: Name: Please use A4 size paper and staple them together. Problem1: Find the pressure angle at the point D of following cam mechanisms Problem 2:

6 (c) Fig 6-5 (a)The equation for the acceleration is given as A=(2 u)sin(管6)，S0 V-2 sin()d8=合w-cost停10] S=vd0=昌huw-sin(管) (b)The maximum peak)value of the acceleration is 5 units was given when日=是.s05 wnits-8Tg Ynaw=台u(0-是 2hu 今Vmax= 1.25units 8hw* TW Smax=hw (6=p) 582 →B mat=- hu =625Punits 8rhw Tw 53*

Fig 6-5

Problem 3: Design a double-dwell cam to move a follower from0to2.5"in60°，dwell for120°， fall 2.5"in 30 and dwell for the remainder.The total cycle must take 4 sec.Choose suitable programs for rise and fall to minimize accelerations.Plot the s y a j diagrams. (using software Dynacam on the course website.Don't forget to change the program property to XP compatible mode and administrative way after installed when on a 64-bit OS)

Problem 3: (using software Dynacam on the course website. Don’t forget to change the program property to XP compatible mode and administrative way after installed when on a 64-bit OS)