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The article describes the procedure of structurally-parametrical optimization of technological process by Dijkstra's method with using of Dijkstra’s functional (recurrent) equation and Mathcad system.
#Soil excavator last oasis software#
The proposed procedure of mechanical driving-gear dynamic analysis using Mathcad software significantly decreases time and working costs on execution of such computations and helps to execute investigations related with changing of driving-gear elements parameters efficiently. This approach provides high level of the driving-gear dynamic analysis, including the received results presentation, which is especially important on the earliest stages of mechanical driving-gear design. On the fourth stage the mechanical driving-gear modelling is performed and calculation data in numerical and graphical forms is obtained. On the third stage computer model of driving-gear performance using system Mathcad is created and initial data is defined. There is a standard method for writing a higher-order RDE as a system of the first-order RDEs.
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The system of second-order regular differential equations is transformed into a system of first-order regular differential equations. Mathematical model of mechanical driving-gear is a system of second-order regular differential equations (RDEs). On the second stage mathematical model of driving-gear performance with using of mnemonic rule is created. The driving-gear is represented in a graphic kind by means of the marked graph. On the first stage driving-gear is represented in the form of consistently connected rotation bodies. The proposed procedure of automation of optimization technological process using Bellman’s method and system Mathcad significantly decreases time and labour costs on execution of such calculations and efficiently to execute investigations related with change of equipment parameters.Ī new approach of mechanical driving-gear dynamic analysis, which includes several modelling stages is observed in the article. The second phase is definition of the required optimum set of equipment which is carrying out all technological process with the minimum expenses. The first phase is calculations of the minimum expenses for execution of all partial technological processes, from last operation of process to the first. The algorithm of the decision of a problem by Bellman’s method includes two phases. It is necessary to execute automation of optimization technological process with the minimum expenses. Expenses for execution by k equipment i operation can depend on the equipment - j, which executed previous ( i-1 ) operation. Expenses (cost, time, …) on execution of i operation by k equipment after execution by j equipment ( i-1 ) operation are known - c (i, j, k). As rule the technological processes includes n of operations and each operation can be executed by various types of equipment. The article describes the procedure automation of optimization discrete technological processes with using of Bellman’s functional (recurrent) equation and system Mathcad. The step-by-step calculation and imaging of each section of the operating zone eventually represents the entire operating zone of the excavator equipped with backhoe attachment. Mathcad software is provided for calculation of each section of the zone making its graphical representation. The operating zone of soil excavation of the excavator equipped with backhoe attachment includes six sections. The solution of this problem requires using of modern computer systems taking of certain system engineering measures. The kinematic analysis is conducted in order to determine the coordinates of any joint or reference point of any component of working attachment, e.g., to determine the motion path of bucket tooth in main frame of reference 00x0y0 with due regard to potential movements of bucket, stick and boom. However, the detailed description of interconnected components in the main frame of reference is required to obtain parameters of the item in greater generality. In general, for simplicity the descriptions of every component of equipment and attachment are provided in local coordinates referenced to the designed or studied component. The determination of operating zone is a complex and time-taking process. The operating digging zone is one of important parameters of a single-bucket excavator attachment and depends on the dimensions of the components of working attachment and their angles of swing. The article describes the method, procedure and software applications of Mathcad Software System used to determine an operating zone of soil excavation of the excavator equipped with backhoe attachment.