Possibilities of modelling optimization design problems as the extreme combinatorial graph problems and solving them in MS Excel Solver are studied. Drawbacks of existing models from considering their realization in MS Excel Solver are analyzed.
We have described the way of modernizing the linear motor to increase its initial forcing. We have found the way to compensate for force ripple. The optimum parameters of modernization have been set, and the results of the experiments have been provided
It has been offered the algorithms determine the optimal location of distribution substations or switchgear for the electrical system , taking into account external power line. Optimality criterion selected discounted costs. It is shown that the optimal position location distribution substation (switching substation) is shifted from the centre of electrical loads in the direction of power.
Для процесів кавітаційного очищення стічних вод від органічних домішок розроблено математичні моделі, що адекватно поєднують їх технологічні параметри із показниками якості обробки. У якості стічних вод розглянуто води пивоваріння, молокопереробної промисловості та воду громадського використання.
Methods and results of experimental studies deformation of fragments of monolithic reinforced concrete floor are posted: solid brand DF-1; inserts with transverse marks DF-2; mark DF-3 with longitudinal inserts. Overall dimensions of test samples were the same length 2.05 m, width and height section 355x180 mm. Tested prototypes of two concentrated forces, measuring the deformation of the normal sections in the area of pure bending in 3 inclined sections between the supports and lumped forces and deflections general.
An overview of the existing structural and technological solutions of bridge spans constructions optimization in order to reduce their weight, precast; precast-monolithic and monolithic have been complete.
Passive, broadband targeted energy transfer refers to the one-way directed transfer of energy from a primary subsystem to a nonlinear attachment; this phenomenon is realized in damped, coupled, essentially nonlinear impact or particle dynamic vibration absorber (DVA). An impact damper is a passive control device which takes the form of a freely moving mass, constrained by stops attached to the structure under control, i.e. the primary structure. The damping results from the exchange of momentum during impacts between the mass and the stops as the structure vibrates.
The objective of present study was to determine optimal conditions to achieve satisfactory friction welds between two dissimilar metals namely copper and carbon steel bars of same diameter. Three process parameters namely speed of rotation, axial pressure, and forge pressure were considered for the present study. Two multiple performance characteristics, considered were breaking load strength and upset. The optimization of the process parameters was done using ANOVA.
The analysis of movement modes of cam mechanisms is carried out. The technique of optimum movement modes synthesis is proposed; it allows to receive any modes which reflect certain properties of a cam mechanism. Complex optimum movement modes which simultaneously take into consideration several properties of cam mechanisms are most promising. Such optimum movement modes can be received on the basis of complex criteria taking into account optimum movement modes of cam mechanisms by single integrated criteria.
The paper deals with the methods of calculation and optimization of constructions of the impact dynamic vibration absorbers (DVA ) for the elongated structures. An efficient numerical approach based on the theoretical-experimental method is proposed to maximize the minimal damping of modes in a prescribed frequency range for the tuned-mass impact systems. Methods of decomposition and numerical synthesis are considered on the basis of an adaptive schemes. The influence of dynamic vibration absorbers and basic design elastic and damping properties is under discussion.