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... point O2 on line B[B2 extended Bisect line segment B [B2 , and draw a circle of that radius about 02 Label the two intersections of the circle and B[B2 extended, A[ and A2 Measure the length of the ... seen that the designer will have little direct control over the location of the fixed pivots since they are one of the results of the synthesis process It is common for the designer to have some ... defined as the angle between the output link and the coupler * It is usually taken as the absolute value of the acute angle of the pair of angles at the intersection of the two links and varies...

... are then solved to find links and 3, and the appropriate vector components are added together to get the locations of fixed pivots Oz and 04 The link lengths are returned to the main part of program ... by the angles of the position vectors Zl and Zz The angle corresponds to the Equations 5 .31 can be solved using the approach of equations 5.27 and 5.18, by changing W to U and Z to S and ... with the values from equation 5.25 inserted to get the coordinates of vectors W and Z, and a second time with values from equation 5 .31 in the matrix to get the coordinates of vectors U and S...

... example link is the driver, and 8z and OOz are given for the "freeze frame" position shown We wish to solve for 0 04, the angular velocity of link 4, and also for the velocity of slip at the joint labeled ... 6-18 the axis of slip is shown to be tangent to the slider motion and is the line along which all sliding occurs between links and The axis of transmission is defined to be perpendicular to the ... P referenced to the origin of the global coordinate system The right side defines it as the sum of the absolute acceleration of some other reference point A in the same system and the acceleration...

... the direction of motion (velocity) of the follower and the direction of the axis oftransmission.* When = 0, all the transmitted force goes into motion of the follower and none into slip velocity ... defined as the smallest circle which can be drawn tangent to the locus of the centerline of the follower as shown in Figure 8-39 The locus of the centerline of the follower is called the pitch ... matched exactly to the conveyor, in order to carry the tools alongside for a long enough time to their job These cam driven "chaser" mechanisms must then return the tool quickly to its start position...

... stage of the design to accurately determine the best sizes and shapes of the parts We must estimate the masses of the links and other parts of the design in order to make a first pass at the calculation ... golf club In the case of our mallet example, a center of percussion at the head corresponds to a center of rotation near the end of the handle, and the handle is usually contoured to encourage ... spot on the bat The "right place on the bat" to hit the ball is the center of percussion associated with the point that your hands grip the bat (the center of rotation) Hitting the ball at other...

... by the driver (motor) and stored temporarily in the moving links, and the negative pulses of torque as energy attempting to return from the links to the driver Unfortunately most motors are designed ... than the peak torque We would like to provide some means to smooth out these oscillations in torque during the cycle This will allow us to size the motor to deliver the average torque rather ... out of the system needs to be absorbed by the flywheel and then returned to the system during each cycle to smooth the variations in shaft speed the torque curve (see Table 11-1, p 552) and the...

... allow us to size the motor to deliver the average torque rather than the peak torque One convenient and relatively inexpensive means to this end is the addition of a flywheel to the system TORQUE ... by the driver (motor) and stored temporarily in the moving links, and the negative pulses of torque as energy attempting to return from the links to the driver Unfortunately most motors are designed ... out of the system needs to be absorbed by the flywheel and then returned to the system during each cycle to smooth the variations in shaft speed the torque curve (see Table 11-1, p 552) and the...

... program These are noted in the text The student is encouraged to investigate these examples with program ENGINE in order to develop an understanding of and insight to the subtleties of this topic ... one to the other, in order to stagger the motions of the pistons in time It should be apparent from the discussion of shaking forces and balancing in the previous chapter that we would like to ... our intention to make an "engine designer" of the student so much as to apply dynamic principles to a realistic design problem of general interest and also to convey the complexity and fascination...

... diligently attempts to interpret the program's results and relate them to the relevant theory, a more thorough understanding of the kinematics and dynamics can result On the other hand, there is a great ... well as the magnitude and angle of the vector are displayed The programs also allow alternate presentations of polar plots, showing just the vectors, just the envelope of the path of the vector tips, ... change any of the linkage parameters on the Animate screen and then recalculate the results there with the Recalc button The Done button on either the Input or Animate screen returns you to the Home...

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