Download e-book for iPad: A Background to Engineering Design by Peter Polak (auth.)

By Peter Polak (auth.)

ISBN-10: 0333187717

ISBN-13: 9780333187715

ISBN-10: 1349027073

ISBN-13: 9781349027071

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Extra resources for A Background to Engineering Design

Sample text

The two basic Watt linkages are shown in figure 38. The instantaneous centre still tends to follow point P. An indirect use of a Watt linkage produces the vertical motion of pantograph current-collectors for electric railways. These require vertical, not angular, motion, so that trains can go forwards or backwards without trouble arising from frictioninduced bounce at the contacts; the moving parts should have low friction and low inertia, making a linkage the natural choice (figure 39). These collectors are not pantographs in the classical sense; a true pantograph uses parallelogram linkages to enlarge or reduce the motion of a point.

It is allowed to deflect slightly sideways (which is detrimental to stability in extreme cases) and as it moves it skews slightly, pointing into the bend and thus compensating for the outward drift in proportion to the side-force. Figure 47 shows how this compensation can be obtained without allowing axle side-movement by using body-roll which is also proportional. to side-force although it takes a little time to develop. Omitting a great deal of detail essential for the vehicle but not essential for this explanation, the rear axle is located by arms A.

Net cross section Figure 21. f. Theory __ L _____ _ -·B=t}d Radius=0·15 d 1·5 2 in. 50mm Figure 22. Effect of size on endurance test results Figure 23. Stress- raisers in shrink- fitted assemblies p high, partial yield ddci-d -·uu-·err·I I I Figure 24. I 0 compressive Figure 25. Autofrettage 21 practice) or shot-peening which affects the surface finish and is appropriate for springs. Some case-hardening treatments, notably nitriding, also induce compressive stress. These stresses normally arouse a balancing tensile stress below the surface which is generally harmless but should not be forgotten.

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A Background to Engineering Design by Peter Polak (auth.)


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