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Warsaw, Poland

Andreev V.I.,MGSU | Avershyev A.S.,MGSU | Jemiolo S.,WUT
Advanced Materials Research | Year: 2014

The article deals with the elastic-plastic state of inhomogeneous array with a spherical cavity. Model is used thick-walled ball of an elastic-perfectly plastic material (Prandtl diagram). It is shown that in the inhomogeneous material, depending on the inhomogeneity functions describing the change of the modulus of elasticity and yield stress of soil plastic deformation may appear on both the inner and outer surface of the ball and inside it. Are found values of the limit loads, displacement diagrams are constructed in an array. © (2014) Trans Tech Publications, Switzerland.

Zgalat-Lozynskyy O.,IPMS | Herrmann M.,IKTS | Ragulya A.,IPMS | Andrzejczuk M.,WUT | Polotai A.,MRA Laboratories Inc
Archives of Metallurgy and Materials | Year: 2012

Consolidation of commercially available titanium nitride nanostructured powder as well as nanocomposite powders in the Si 3N 4-TiN and TiN-TiB 2 systems have been performed by Spark Plasma Sintering (SPS) in the temperature range from 1200°C to 1550 °C. The effect of non-linear heating and loading regimes on high melting point nanocomposites consolidation has been investigated.

Zgalat-Lozynskyy O.,IPMS | Varchenko V.,IPMS | Tischenko N.,IPMS | Ragulya A.,IPMS | And 2 more authors.
Tribology International | Year: 2015

A comprehensive study was performed to evaluate tribological performances of newly developed Si3N4-based nanocomposites enhanced by either Si3N4 nanowhiskers or TiN nanoparticles and consolidated via a Rate Controlled Sintering technique. A wear resistance of Si3N4-based nanocomposites was studied under dry sliding conditions using bearing steel, hard alloy, and Si3N4-based nanocomposites counterparts. The Si3N4-TiN nanocomposites exhibited low sliding friction coefficient o 0.35 with hard alloy and < 0.25 with Si3N4-based nanocomposite. A specific wear rate for the investigated nanocomposites was estimated to be in the range from 2 · 10-7 mm3/N m to 5 · 10-8 mm3/N m. A chemical resistance of the Si3N4-TiN nanocomposite was investigated in aggressive mediums, such as acids and bases at elevated temperatures. © 2015 Elsevier Ltd. All rights reserved.

Wuhan Ligong Daxue Xuebao (Jiaotong Kexue Yu Gongcheng Ban)/Journal of Wuhan University of Technology (Transportation Science and Engineering) | Year: 2011

This paper discusses the multicast routing problem of the wireless sensor networks (WSN) with multiple QoS constraints, which may deal with the delay, bandwidth and surplus energy metrics, and describes a network model for researching the routing problem. It presents an energy-efficient multicast routing algorithm with multiple QoS constraints (EMRA). The EMRA successfully solves the QoS routing problems when multicast nodes change dynamically in the networks. In this paper, the proof of correctness and complexity analysis of the EMRA are also given. The superiority and effectiveness are proved by simulation.

Zhang C.,WUT | Xu C.,WUT
Wuhan Ligong Daxue Xuebao (Jiaotong Kexue Yu Gongcheng Ban)/Journal of Wuhan University of Technology (Transportation Science and Engineering) | Year: 2012

For the structure design and calculation of floating crane arm, BP neural network algorithm is used to simulate the relations between the arm frame structure optimization design variables and arms frame structure stress and displacement, and calling the minimize function of MATLAB optimal toolbox to optimized the arm constraint conditions and the objective function. Comparing and analyzing the result after optimization and the values before optimization, the BP neural network optimization algorithm is fully verified.

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