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Efremov

Criterial Estimations of Mechanical Impact
Engineering Education # 08, August 2016
DOI: 10.7463/0816.0843269
pp. 104-120
Systems for the Shock Isolation of Engineering Objects
Engineering Education # 11, November 2015
DOI: 10.7463/1115.0817507
pp. 344-369
Thermoelectrical Generator for a MEMS-Fuze
Engineering Education # 04, April 2015
DOI: 10.7463/0415.0764526
pp.171-188
Magnetoelastic Generator Type Transducer
Engineering Education # 06, June 2014
DOI: 10.7463/0614.0716613
Generator type magnetoelastic transducers are considered as fuze contact target sensors and as means of dynamic force measuring. It is shown that the transducer may have a nontraditional scheme containing only one output coil which is capable of integrating the input force signal. The generating effect in magnetically soft materials is characterized by “piezomagnetodynamic” hysteresis curves as a result of shock loading of the magnetic conductor. The results of experimental evaluation of the dynamic force function of contact target sensor are presented. The magnetoelastic transducer may also be used for the evaluation of bullet-proof vest efficiency.
Approximation of the air resistance law of 1943
Engineering Education # 10, October 2013
DOI: 10.7463/1013.0609269
The author proposes a method of fitting the Siacci air resistance law which was practically approved to the law of 1943. This law is widely used in the Russian Federation for computing parameters of trajectories of projectiles but doesn’t have an analytic description up until today. In this work a corrective multiplier for the Siacci function was introduced; this factor represents analytical approximation of a sequence of discrete compensation factors in the form of a continuous dependence on the projectile speed (Mach number). As a result, computation of the trajectory parameters with the use of a PC is simplified. An example of using the approximation is also provided.
Some features of calculating the response of contact target sensors of fuses
Engineering Education # 08, August 2013
DOI: 10.7463/0813.0605972
In order to determine the initial stage of the interacting process between an explosive item and an obstruction, which is the most important for operation of contact target sensors (CTS), the author proposes two approaches to approximation of initial force characteristic of an obstruction; they were a piecewise function and a dependence of the explosive item’s cross sectional area on displacement. In this process, empirical formulas for the full path of an explosive item’s punching-in into an obstruction were used along with some experimentally derived facts. An example of calculating the response of the cluster ammunition element’s CTS was given. The author considers a possibility of using an integrating type of CTS as a means of measuring the explosive item’s speed after piercing an obstruction and filtering the imposed oscillations.
77-30569/322339 Some features of shock testing
Engineering Education # 02, February 2012
Some issues relating to the simulation of shock pulse excitations were considered. Common schemes of shock equipment were presented as well as the method of calculating of the parameters of elastic and elastic-plastic contact zone of colliding bodies. It was shown that the conditions of simulation testing could be more severe in the sense of strength than the real object performance conditions depending on the dynamic factor value (shock spectrum).
 
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