DESIGN OF MACHINERYAN INTRODUCTION TO THE SYNTHESIS AND ANALYSIS OF MECHANISMS AND MACHINES phần 6 potx

... on it to the product to the next work station where it again stops for another operation to be per- the Atheneum Club in formed. The forces and power required to accelerate and decelerate the large ... suit- ed to the problem and is a form of qualitative synthesis. t This is perhaps the most diffi- cult task for the student as it requires some experience an...

Ngày tải lên: 08/08/2014, 12:23

... respectively) on the coupler (link 3). We wish to solve for the coordinates of vectors W, Z, D, and S, which define not only the lengths of those links but also the locations of the fixed pivots Oz and 04 in ... using the approach of equations 5.27 and 5.18, by changing W to U and Z to S and using the definitions of the constants given in equation 5.3...

Ngày tải lên: 08/08/2014, 13:20

... the fixed and moving centrodes for any linkage input to it. Input the datafiles F 06- l4.4br, F 06- 15aAbr, and F 06- l5bAbr into program FOURBARto see the centrodes of these linkage drawn as the linkages ... angular velocity of link 4, and also for the velocity of slip at the joint labeled A. In Figure 6- 18 the axis of slip is shown to be tangent to the...

Ngày tải lên: 08/08/2014, 13:20

... the next step is to size the cam. There are two major factors which affect cam size, the pressure angle and the radius of curva- ture. Both of these involve either the base circle radius on the ... side and high dwell on the other, note that the velocity function is multivalued. There are discontinuities at these boundaries. The effect of these discontinuities is...

Ngày tải lên: 08/08/2014, 13:20

... 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. We will then have to iterate to better and better ... on the rolling centrodes of a Grashof double-crank fourbar linkage. Centrodes are the loci of the instant centers of the linkage and were described i...

Ngày tải lên: 08/08/2014, 13:20

... us to size the motor to deliver the average torque rather than the peak torque. One convenient and rel- atively inexpensive means to this end is the addition of a flywheel to the system. TORQUE ... the driver (motor) and stored temporarily in the moving links, and the negative pulses of torque as energy at- tempting to return from the links to the dri...

Ngày tải lên: 08/08/2014, 13:20

... us to size the motor to deliver the average torque rather than the peak torque. One convenient and rel- atively inexpensive means to this end is the addition of a flywheel to the system. TORQUE ... the driver (motor) and stored temporarily in the moving links, and the negative pulses of torque as energy at- tempting to return from the links to the dri...

Ngày tải lên: 08/08/2014, 13:20

... the program. These are noted in the text. The student is encouraged to investigate these ex- amples with program ENGINE in order to develop an understanding of and insight to the subtleties of this topic. ... the length of the balance shafts/crank- shaft being designed. The magnitude and angular locations of the balance masses can then be calculated by the...

Ngày tải lên: 08/08/2014, 13:20

... as the magnitude and angle of the vector are displayed. The programs also allow alternate presentations of polar plots, showing just the vec- tors, just the envelope of the path of the vector ... 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 o...

Ngày tải lên: 08/08/2014, 13:20

... experience and the relationship between mental and physical states. Then, in chapters 3 and 4, I move on to discuss certain gen- eral theories of the nature of mental states and some attempts to explain ... evidence for the existence of things whose existence is at least genuinely possible. And the provision of just such a conception is one of the principal t...

Ngày tải lên: 01/11/2013, 07:20