By Alexander Evgrafov
This booklet attracts jointly the main fascinating contemporary effects to emerge in mechanical engineering in Russia, delivering a desirable evaluate of the cutting-edge within the box in that state on the way to be of curiosity to a large readership. A huge diversity of subject matters and matters in sleek engineering are mentioned, together with dynamics of machines, fabrics engineering, structural power and tribological habit, shipping applied sciences, equipment caliber and recommendations. The booklet contains chosen papers awarded on the convention "Modern Engineering: technological know-how and Education", held on the Saint Petersburg nation Polytechnic collage in 2014 with the help of the Russian Engineering Union. The authors are specialists in a variety of fields of engineering, and the entire papers were conscientiously reviewed. The publication should be of curiosity to mechanical engineers, teachers in engineering disciplines and engineering graduates.
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Additional resources for Advances in Mechanical Engineering: Selected Contributions from the Conference “Modern Engineering: Science and Education”, Saint Petersburg, Russia, June 2014
For a metric thread, a ¼ 60 ; w % 2 : We write the equation of the balance of forces on the tangent and the vertical axis. Fig. A. Sukhanov Fs ¼ fR cos w þ R sin w; a F0 ¼ R cos cos w À fR sin w: 2 Here R is a normal reaction in the thread. Except for R, we ﬁnd the time thread to be MP ¼ Fs dP f þ tgw dP ¼ F0 : a cos 2 À f Á tgw 2 2 ð11Þ Note that (11) coincides exactly with the formula obtained in . Then, the tightening torque is ⎛ ⎞ ⎜ k k ⎟ f + tgψ + M = M +M =⎜ f ⎟ F0 d . 35 × 10−5 f 4 ) F0 d .
MDDE MEEF ! MEDE Transformation matrix 0 cosðÀaD Þ sinðÀaD Þ @ À sinðaD Þ cosðÀaD Þ 0 0 Á MCCD ! MDCD MBAB ! G. A. Galiullin Table 1 (continued) Name À EF Á MF ! MEEF À À À À MFFA ! MFEF MAFA ! MFFA MAAB ! MAFA MBAB ! MAAB Coordinate systems Á 0 Á 0 Á 0 Á 0 cosðÀaF Þ @ À sinðÀaF Þ 0 sinðÀaF Þ cosðÀaF Þ 0 1 0 0A 1 1 0 0 À1 @0 1 0 A 1 0 0 cosðaA Þ @ À sinðaA Þ 0 sinðaA Þ cosðaA Þ 0 1 0 0A 1 1 0 0 1 @ 0 1 0A À1 0 0 0 À Transformation matrix 0 1 0 0 1 @ 0 1 0A À1 0 0 Á AB MDDE ! MB cosðÀaD Þ sinðÀaD Þ 0 1 0 0 0 À1 1 B C B C ¼@ À sinðaD Þ cosðÀaD Þ 0 A Á @ 0 1 0 A 0 0 1 1 0 0 0 1 0 1 cosðaC Þ sinðaC Þ 0 0 0 À1 B C B C Á @ À sinðaC Þ cosðaC Þ 0 A Á @ 0 1 0 A 0 0 1 1 0 0 0 1 cosðaB Þ sinðaB Þ 0 B C Á @ À sinðaB Þ cosðaB Þ 0 A 0 0 1 ð8Þ Kinematic Research of Bricard Linkage Modiﬁcations À Á AB MDDE !
D nominal (outer) bolt diameter d0 the inner diameter of the thread (diameter of the solid body below the threads of the bolt) d0 þ d the average diameter of the thread dP ¼ 2 size nut turnkey d dC the average diameter of the support ring contact nut h thread pitch d clearance hole f friction coefﬁcient pairs bolt/nut, nut/washer friction between the joined parts f pd 2 nominal cross-sectional area of the bolt S¼ 4 2 pd sectional area of a threaded bolt S ¼ 0 0 4 k0 ¼ dd0 ; kP ¼ ddP thread coefﬁcients nut coefﬁcient kC ¼ ddC nut torque M d h f d M f d δ f d d Fig.
Advances in Mechanical Engineering: Selected Contributions from the Conference “Modern Engineering: Science and Education”, Saint Petersburg, Russia, June 2014 by Alexander Evgrafov