MEEG439
MACHINE DYNAMICS
SPRING2006
Limit Positions
CrankRocker
1
b a d b a
c
2 + c 2 - (d - a ) 2 b 1 = cos 2bc 2 = 0
-1
c
a + b ) 2 + d 2 - c 2 ( 2 = cos 2 ( a + b) d
-1
2
d b a
2
c d c
2 + c 2 - (d + a ) 2 b 2 = cos -1 2bc 2 = 180 b - a ) 2 + d 2 -
MEEG439
MACHINE DYNAMICS
SPRING2006
4.6 Fourbar SliderCrank Position Solution
3 A r2 a O
2
r3 2 r1 d
b rs c r4
B
4
Offset slider crank slider axis does not pass through the crank pivot Need only 3 vectors r2, r3, rs, but we will use r4, r5 in place of
MEEG439
MACHINE DYNAMICS
SPRING, 2006
Chapter 4 Position Analysis
4.0 Introduction We need to analyze the mechanisms synthesized in Chapter 3 Eventually we need stresses in all members to assure no parts fail Need force, and acceleration
o Force: both sta
Cams
6.1 Introduction
6.1.1 A Simple Experiment: What is a Cam?
Figure 6-1 Simple Cam experiment Take a pencil and a book to do an experiment as shown above. Make the book an inclined plane and use the pencil as a slider (use your hand as a guide). When y
Acceleration Analysis
MEEG439 SPRING 2006
1
Vector Derivation
Angular acceleration: = d / dt r r Vector Form: A = dV / dt r r j j VPA = dRPA / dt = pje d / dt = p je r r APA = dVPA / dt = d ( p je j ) dt = = jp ( e j d / dt + j e j d / dt ) = p je j - p 2
DESIGN OF MACHINERY
SOLUTION MANUAL 4-18b-1
!
PROBLEM 4-18b
Statement:
Scale Figure P4-5b to obtain dimensions for the problem. Find and plot the angular position of links BC and CD and the transmission angle as a function of the angle of wheel W as it ro
MEEG439
Lecture Cams
Introduction
A cam is an irregular shaped machine member which serves as a driving link and which imparts motion to a driven link called the follower Examples: Translating
Translating roller follower cam Rotating roller follower flat-
Force Analysis of Machinery
I. Introduction:
In a dynamic analysis, we create equations that relate force and motion of a body (as in ME 233) or in our case a mechanism or machine. These are called equations of motion. There are 2 directions to these prob
Gears
Gears are machine elements that transmit motion by means of successively engaging teeth. The gear teeth act like small levers.
7.1 Gear Classification
Gears may be classified according to the relative position of the axes of revolution. The axes may
PETROLEUM INSTITUTE MECHANICAL ENGINEERING MACHINE DYNAMICS, MEEG439 HW3 Q1. Find all the instant centers of the linkages shown in the figure below.
Q2. The linkage in Figure b has link1 at -360 and link2 at 570 in the body XY coordinate system. Find 4, V
MEEG439
MACHINE DYNAMICS
SPRING 2006
THE PETROLEUM INSTITUTE MECHANICAL ENGINEERING MACHINE DYNAMICS, MEEG439 HW5
1 On the figure below, link 4 is sliding to the right at 2 units/sec. For the position shown, (a) find the angular velocities of links 2 and
Mechanisms Modeling and Analysis
Purpose:
1. 2. 3. 4. Provides insight and intuition about the deice Low cost of a model compared to actual device Safer, cheaper, faster Better Final Results
General Approach:
The idea is to replace the physical elements o
Part VII: Gear Systems: Analysis This section will review standard gear systems and will provide the basic tools to perform analysis on these systems. The areas covered in this section are: 1) 2) 3) 4) 5) Gears 101: The geometric details about standard ge
Part I: Kinematics, the fundamentals
This section will provide an overview of the fundamental concepts in kinematics. This will include the following topics: 1. What is Kinematics? 2. Kinematics within mechanics 3. Key definitions 4. Motion and kinematics
KINEMATICS FUNDAMENTALS
(O) (b)
FlGURE 2-25
seiwae-e t ; z V. MM
Compliant bistable silicon micromechonism in WC posiiions Courtesy of Professor Larry L
Howell, Brigham Young University
2.17 PRACTICAL CONSIDERATIONS
There are many fac
Analytic Approach to Mechanism Design
MEEG439 SPRING 2006
1
Position synthesis
Analytic Approach
Would like to solve for:
Position Velocity Acceleration Forces and torques at each position
Can be done graphically Our approach will be analytic for gener
Computer-Aided Design and Analysis of the Whitworth Quick Return Mechanism
Matt Campbell Stephen S. Nestinger Computer-Aided Mechanism Design, Project Department of Mechanincal and Aeronautical Engineering University of California Davis, CA 95616
March 20
Dynamic Mechanism Design
It is essential that you have completed the previous two tutorials on mechanisms from this series before starting this one. The part and assembly files for this model can downloaded from the internet and can be found at http:/www.
MEEG439
MACHINE DYNAMICS
SPRING 2006
Example
Design a double dwell cam to move a follower from 0 to 2 in in 60, dwell for 150, fall 2 in in 90 and dwell for the remainder. The cycle time is 4 sec. 1. Choose a suitable profile for the rise and fall to mini
MEEG439
MACHINE DYNAMICS
SPRING 2006
Chapter 8 Cam Design
8.0 Introduction
Easy to design, difficult to make Equivalent to four-bar linkage with variable length links Function generation This chapter deals with design of cams to meet specific goals Class