Advances in Mechanical Engineering: Selected Contributions by Alexander Evgrafov

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By Alexander Evgrafov

This ebook attracts jointly the main attention-grabbing fresh effects to emerge in mechanical engineering in Russia, supplying a desirable evaluation of the state-of-the-art within the box in that kingdom for you to be of curiosity to a large readership. A huge variety of subject matters and matters in glossy engineering are mentioned, together with dynamics of machines, fabrics engineering, structural energy and tribological habit, delivery applied sciences, equipment caliber and techniques. The e-book contains chosen papers provided on the convention "Modern Engineering: technology and Education", held on the Saint Petersburg nation Polytechnic college in 2014 with the help of the Russian Engineering Union. The authors are specialists in quite a few fields of engineering, and the entire papers were rigorously reviewed. The booklet can be of curiosity to mechanical engineers, teachers in engineering disciplines and engineering graduates.

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In Russian) 18. Ziborov KA, Matsyuk IN, Shlyahov EM (2010) Power analysis of mechanisms using Mathcad. Theor Mech Mach 8(1):83–88. (in Russian) 19. Mkrtychev OV (2013) Computer simulations in the plain mechanisms power calculation. Theor Mech Mach 11(1):77–83. (In Russian) 20. Evgrafov AN, Petrov GN (2008) Computer animation of kinematic schemes in excel and mathcad. Theor Mech Mach 6(1):71–80. (In Russian) 21. Petrov GN (2004) Computer simulation of mechanical systems in the “ModelVision”. Theor Mech Mach 2(1):75–79.

8, a very good agreement with the experimental data [3]. The slight difference from the theoretical piecewise linear relationship (Fig. 7) is due to the presence of nonlinear contact relations. F N N Fig. 8 Simulated bolted connections F Disclosure of interface N* F0 45° 0 N0 N* N Fig. 9 The experimental dependence of the total force in the bolt from the external load Engineering Calculations of Bolt Connections 53 According to the results of numerical simulation (Fig. 9), we find the average value of the coefficient of refined base load to be v ¼ 0:25: ð41Þ With such a load factor of the main joint, stock density will be NÃ 1 ¼ 1:33; ¼ N0 1 À 0:25 ð42Þ which is sufficient to provide a reliable and tight joint.

3 Gauges on wheel (for 1/4 wheel) Modern Methods of Contact Forces Between Wheelset and Rails … 61 The algorithm is based on the relation between a vector of measured strains increments De and a vector of force components with increments and contact points coordinates DR like De ¼ ADR ð1Þ where A is a Jacobi matrix n × m. Here the number of equations n = 64 is higher than the number of unknowns m = 8 and a system of equations usually does not have an exact solution. So a “pseudo solution” DR is used that minimizes a Euclid norm of error kADR À Dek, DR ¼ ðAT AÞÀ1 AT De: ð2Þ A finite element model of a wheelset is used to obtain matrix A coefficients.

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