scholarly journals Internal friction influence on the calculation results and rod system optimization under impulse action

2021 ◽  
Vol 2131 (3) ◽  
pp. 032086
Author(s):  
G Grebenuk ◽  
M Veshkin
Keyword(s):  
Internal Friction ◽  
Optimal Solution ◽  
System Optimization ◽  
Dynamic Responses ◽  
Active Movement ◽  
Elastic Rod ◽  
Variable Parameters ◽  
Impulse Action ◽  
Rod System ◽  
Calculation Results

Abstract An algorithm for calculating elastic rod systems under the action of impulse loads, using a complex model of internal friction in the material, has been developed and implemented in software. Very short (instantaneous) and extended in time impulses are considered as variants of impulse action. The importance of taking into account the vibration energy dissipation due to internal friction in the material of the structure is shown, considering impulse effects. The implemented software module is used to calculate the dynamic responses of the system in the search for the optimal solution of the control program for the selected variable parameters, target and restrictive functions. The problem of optimizing a flat frame system loaded with static and impulse loads has been posed and solved. An algorithm for finding an optimal solution is considered. Variants of dividing variable parameters into generalized groups are discussed. The minimum volume of material, spent on the structure, is taken as an optimality criterion. Analysis of the influence of the pulse duration of a given value on the calculation results without and with internal friction, as well as a comparative analysis of the optimal designs obtained without and with internal friction in the material and various tolerances for horizontal displacements. The results obtained indicate a significant effect of internal friction on the characteristics of the optimal design, especially with active movement restrictions.

Hybrid Photovoltaic-Diesel Energy System Optimization (Case Study of Electric Power Supply for Buildings under the Weather Conditions of Montenegro)

2014 ◽  
Vol 627 ◽  
pp. 357-364 ◽  
Author(s):  
Goran Radovic ◽  
Vera Murgul ◽  
Nikolai Vatin ◽  
Ekaterina Aronova
Keyword(s):  
Power Systems ◽  
Electric Power ◽  
Power Supply ◽  
Optimal Solution ◽  
Weather Conditions ◽  
System Optimization ◽  
Energy System ◽  
Energy Performance ◽  
Electric Power Supply ◽  
Continuous Power

The article deals with the concept of solar photovoltaic systems use in power supply systems. An analysis of local solar resources potential has been carried out, and optimal orientation points of radiant heat absorbing photovoltaic panels have been chosen to achieve maximum energy performance. Simulation of electric power systems having different configurations has been implemented using the software program Homer. It has been stated that a combination of solar and diesel energy systems is considered to be an optimal solution under the weather conditions of Montenegro. The systems working together make it possible to reduce maintenance costs significantly and adjust capacity generation schedule with due account for energy consumption features to a maximum extent. This allows generating electric power at less cost and results in a more reliable and continuous power supply without failures for a consumer chosen.

scholarly journals Optimization of the truss beam. Verification of the calculation results

2018 ◽  
Vol 230 ◽  
pp. 02037 ◽  
Author(s):  
Glib Vatulia ◽  
Sophia Komagorova ◽  
Mykhailo Pavliuchenkov
Keyword(s):  
Theoretical Calculations ◽  
Optimality Criteria ◽  
Constant Load ◽  
Bending Moments ◽  
Convergence Criteria ◽  
Variable Parameters ◽  
Software Complex ◽  
Comparison Of Results ◽  
Calculation Results ◽  
Construction Optimization

The article presents a comparison of results of optimized calculation of a truss beam which was chosen as a combined construction. The results of calculation of a beam are compared using the method based on the properties of spacer systems and the calculation of the construction designed in LIRA software complex. The article is dedicated to verification of adequacy of the results of theoretical calculations of construction optimization. Values of longitudinal forces and bending moments appearing in a truss beam are chosen as convergence criteria. Two variants of construction loading are considered: a truss beam exposed to constant load only and a truss beam exposed to constant and temporary load. In the case under consideration, the minimum value (weight) of construction is an optimality criteria, variable parameters include beam panel length and camber height of a trussing rod. As a result, the construction will be considered optimal, if bearing and maximal (between the pillars) bending moments are equal in it. The result of verification of the obtained data is the value of error.

scholarly journals Response Analysis of Asphalt Pavement under Dynamic Loadings: Loading Equivalence

2019 ◽  
Vol 2019 ◽  
pp. 1-15 ◽  
Author(s):  
Lian-sheng Gao ◽  
Han-cheng Dan ◽  
Liang Li
Keyword(s):  
Fatigue Life ◽  
Dynamic Responses ◽  
Traffic Load ◽  
Asphalt Pavements ◽  
Response Analysis ◽  
Simulation Performance ◽  
Dynamic Loadings ◽  
Calculation Results ◽  
Load Function ◽  
Sinusoidal Load

This paper establishes the equivalent relationships between the half-sinusoidal load, triangular load, vertical stepwise load, and moving traffic load. The governing equation was established for analyzing the dynamic responses of pavement, and half-sinusoidal load, triangular load, and vertical stepwise load functions were transformed into Fourier series expressions. The partial differential governing equations were simplified as ordinary differential equations and the analytical solutions were obtained. Further, the solutions were validated through comparing the theoretical results with numerical simulated results. Calculation results revealed that, for unchanged load periods, increasing the amplitudes of the three loads by 1.06, 1.31, and 1.35 times can better simulate the moving traffic loads. For unchanged load function amplitudes, increasing the function periods by 1.07, 2.23, and 2.1 times (for half-sinusoidal, triangular, and vertical stepwise loads, resp.) can improve the simulation performance. The fatigue life of asphalt pavements under the moving traffic load agrees with that of the three load simulations, indicating that the fatigue life of asphalt pavements is only associated with the load amplitude but not the load patterns.

scholarly journals Determining the vehicles routes by considering its different types and capacity (heterogeneous) to minimize the total distribution cost

2018 ◽  
Vol 154 ◽  
pp. 01069
Author(s):  
Nurhidayat ◽  
Annie Purwani
Keyword(s):  
Optimal Solution ◽  
Fixed Cost ◽  
Routing Problem ◽  
Total Cost ◽  
Vehicle Type ◽  
Different Types ◽  
Insertion Algorithm ◽  
Calculation Results ◽  
Distribution Cost ◽  
Alternative Solutions

Packaged sugar is one of the products in sugar cane manufacture, PT Madubaru Yogyakarta. Currently, the company deals with a high distribution cost because there is no plan to determine the vehicle route, vehicle type, and capacity for distributing the product. In this research, the optimum route of the distributing vehicles is developed. The company has three different types and capacity of vehicles: L300, HD, and PS. A problem in determining the distribution route here is called as Vehicle Routing Problem (VRP). The basic form of classic VRP says that all vehicles owned by a company have the same capacity (homogenous), meanwhile not all companies have the vehicles with same capacity. The heterogeneous variant is used to minimize the fixed cost of vehicles and distribution variant cost using Sequential Insertion Algorithm. This research has three purposes; are minimizing the number of vehicles used (NV), Total time of Completion tour (TCT) and Distribution Total Cost (TCD). The results based on a test calculation of a shipment date (August 19, 2016) of the company show three alternative solutions to distribute the packaged sugar to 12 consumers. The third alternative solution is the optimal solution and chosen as the decision result of the packaged sugar shipment. Based on the calculation results, it is needed 2 vehicles type HD with capacity 7,000 kg and type PS with capacity 3,500 kg, with total time of completion tour (TCT) is 828.49 minutes or 13.81 hours, and distribution total cost is IDR. 959,011.

Reactive Power Optimization in Distribution Network with PV Station Based on Intelligence Algorithm

2013 ◽  
Vol 753-755 ◽  
pp. 2429-2432
Author(s):  
Xin Wei Ren ◽  
Jian Zheng Xu
Keyword(s):  
Power Loss ◽  
Reactive Power ◽  
Optimal Solution ◽  
Active Power ◽  
Reactive Power Optimization ◽  
Pv System ◽  
Voltage Level ◽  
Bacterial Colony ◽  
Calculation Results ◽  
Power Problem

Reactive power problem of PV station in distribution power system is discussed. Probability theory is introduced to calculate the expectation of active power, which is approximately used to replace the randomly changing output. Reactive output can be adjusted by changing some related parameters of the grid-connected PV system. Considering reactive power of PV station as control variables, a model with voltage level constraints of minimizing the active power loss is established and its optimal solution is figured out with IBCC (Improved Bacterial Colony Chemotaxis). Case calculation results show the validity of above-mentioned model and algorithm.

Analysis of Platform on Piles Application on Deformation Control of Underground Pipe in Reclamation Areas

2014 ◽  
Vol 580-583 ◽  
pp. 344-348 ◽  
Author(s):  
Dong Ni Zhou ◽  
Qin Shang ◽  
Bi Xiao
Keyword(s):  
Finite Element ◽  
Soft Soil ◽  
Optimal Solution ◽  
Underground Pipeline ◽  
Deformation Control ◽  
Underground Pipe ◽  
Specification Method ◽  
Design Program ◽  
Coastal Beach ◽  
Calculation Results

At coastal beach soft soil area, reclamation projects may have great effect on the deformation of the existing underground pipeline. In this paper, the engineering specification method and the finite element method are used respectively for the pipe deformation calculation of the application of platform on piles to handle such underground pipeline deformation control. The results show that the application of platform on piles can effectively diminish the settlement deformation of the existing underground pipe. Co mparing the two calculation results and the monitoring results, the finite element calculation results are more in line with the actual. By appropriately increasing the width of the platform and the pile spacing, the initial design program can achieve a more optimal solution.

Introducing Thermal System Optimization in an Introductory Engineering Thermodynamics Course

2001 ◽  
Author(s):  
Aaron R. Byerley ◽  
Harry N. Newton ◽  
John R. Tuite
Keyword(s):  
System Analysis ◽  
Pressure Ratio ◽  
Linear Equations ◽  
Optimal Solution ◽  
System Optimization ◽  
Ideal Gas ◽  
Problem Definition ◽  
Thermal System ◽  
Design And Optimization ◽  
Design Variables

Abstract This paper describes a thermal system analysis, design, and optimization project that has been successfully used for two years in an introductory engineering thermodynamics course. The project has provided the students with an opportunity to gain a first-order understanding of the optimization process through the use of spreadsheets and math applications packages. The assignment has been based on the modeling and optimization of a non-ideal gas turbine cycle for use in an Unlimited Class Hydroplane. Student teams are guided through the five steps of the engineering design process including 1.) “information gathering” using mostly web-based material; 2.) “problem definition and alternative generation” using the rules published by the Unlimited Class Hydroplane Racing Association; 3.) “evaluation” of the alternatives using a predictive model based upon thermodynamic principles; 4.) “decision making” using graphical and numerical results generated by spreadsheets and math applications packages; and 5.) “presentation” of the design recommendations in both oral and written reports. Compressor pressure ratio and isentropic efficiencies for the compressor and turbine were the three design variables. Penalty functions were assigned to each to account for component cost, weight, volume, and complexity. The objective function was defined as the ratio of “shaft power to total penalty units” and was maximized using surface plots generated in Excel 97. The optimal solution was also obtained using Mathcad 8.0, Mathematica 3.0, Solver (an add-in tool for Excel 97), and Ada 95, a general programming language. Animated surface plots clearly illustrated the underlying mathematical operations of optimizing a system of non-linear equations.

scholarly journals New Concept of Combined Microwave Delay Lines for Noise Radar-Based Remote Sensors

Sensors ◽  
2019 ◽  
Vol 19 (22) ◽  
pp. 4842
Author(s):  
Szczepaniak ◽  
Susek
Keyword(s):  
Phase Shifter ◽  
Delay Line ◽  
Vital Signs ◽  
Optimal Solution ◽  
Delay Lines ◽  
Noise Radar ◽  
Digitally Controlled ◽  
Calculation Results ◽  
The Time Domain ◽  
Microwave Techniques

Delay lines with a tunable length are used in a number of applications in the field of microwave techniques. The digitally-controlled analogue wideband delay line is particularly useful in noise radar applications as a precise detector of movement. In order to perform coherent reception in the noise radar, a delay line with a variable delay value is required. To address this issue, this paper comprises a new concept of a digitally-controlled delay line with a set of fine distance gates. In the paper, a solution for micro-movement detection is proposed, which is based on direct signal processing in the time domain with the use of a microwave analogue correlator. This concept assumes the use of a microwave analogue tapped delay line structure. It was found that the optimal solution for a noise radar with an analogue signal correlator is a combined delay line consisting of switched reference sections, a tapped delay line, and a precision phase shifter. The combined delay line presented in this paper is dedicated to serving as the adjustable reference delay for a noise radar intended for the detection of micro-movement. The paper contains the calculation results and delay line implementation for a given example. The new structure of the analogue tapped delay line with the calculation of optimal parameters is also presented. The precise detector of movement can be successfully used for the remote sensing of human vital signs (especially through-the-wall), e.g., breathing and heart beating, with the simultaneous determination of position.

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