Advanced Dynamics and Model-Based Control of Structures and by Tadaharu Adachi, Masahiro Higuchi (auth.), Hans Irschik,

By Tadaharu Adachi, Masahiro Higuchi (auth.), Hans Irschik, Michael Krommer, Alexander K. Belyaev (eds.)

The booklet comprises 26 clinical contributions via best specialists from Russia, Austria, Italy, Japan and Taiwan. It provides an outline on contemporary advancements in complex Dynamics and version established regulate of buildings and Machines. major subject matters are nonlinear keep watch over of buildings and structures, sensing and actuation, energetic and passive damping, nano- and micromechanics, vibrations and waves.

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2 Sections of the fold for some values of the critical parameter 4 The case of torque at drillstring’s end In this case Mt1 ¤ 0 and the closed form solution of the boundary-value problem, (7) and (9), is given by 0 ˚ « D 2 arccos k sin am a« C F '1 ; k 2 ; k 2 ; r kD 2 C cos2 1 2 ; ws Rp D ; 2a  1 1 '1 D arcsin cos k 2 (11) à : (12) Figure 3 shows the angle of rotation 1 vs. 0 for a« D 2 and some values of the non-dimensional torque D Rp Mt1 =2aGIp . One can observe that increase in the external torque improves the stability of rotation.

A number of problems remain to be tackled. First, the effect of the friction should be studied. Second, the problem of dynamic analysis of the jumps is of interest. Clearly, this challenging problem is associated with propagation of the bending-torsional waves in the drillstring and is much more difficult than the present quasi-static analysis. References 1. : Analytical Mechanics. Springer-Verlag, Berlin-Heidelberg (2002) 2. : Mechanics of Elastic Bodies (in Russian). P STU, St. Petersburg (1999) 3.

5(3), 81–86 (1992) 4. : The efficiency of resonantly tuned ultrasonic machines. Machinovedenie (Machine Science) 6. (in Russian) (1981) 5. : Methods of ultrasonic machine efficiency increase. Stanki i Instrumenti (Machine-tools and Tools) 3. (in Russian) (1982) 6. : Ultrasonic cutting as nonlinear (vibro-impact) process. Ultrasonics 36(1–5) (1998) 7. : Ultrasonic Processes and Machines. Springer, Berlin (2007) 8. : Experimental investigation of ultrasonic machine dynamics. Machinovedenie (Machine Science) 4.

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