Project and financial analysis of investment potential of hydraulic test stand for repair companies and service centers

Currently, stationary domestic and foreign test stands are used for assessing the technical condition of bulk hydraulic drives in the repair enterprises and service centers. However, the used domestic stands have disadvantages associated with low accuracy and reliability of the results obtained, limited ranges of diagnostic parameters, and the inability to implement the methods of manufacturers. (Research purpose) The research purpose is in evaluating the investment attractiveness of the hydrostand for repair companies and service centers of hydroelectric unit manufacturers and make a conclusion about its competitiveness. (Materials and methods) Authors have developed a hydrostand for monitoring and evaluating the technical condition, adjustment and post-repair running-in of hydraulic units of a volumetric hydraulic drive. The article presents the estimated cost of its production. The article presents the methodology for calculation of economic efficiency of developed and implemented hydroscand. (Results and discussion) The article shows the feasibility of development by conducting a design and financial analysis of investment attractiveness in relation to the currently operating small innovative enterprise LLC "Agroservice", Saransk. The project was the implementation of designed hydroscand at site for repair of volumetric hydraulic actuators. The cost of manufacturing a new hydrostand was determined in the course of research and is of 1557910 rubles, which is 10.4 percent of the cost of foreign and 44.5 percent of the cost of domestic analogues with higher technical capabilities. (Conclusions) The analysis showed that hydrostand has a relatively low payback period, a high value of the return index and internal rate of return, and a lower cost. These indicators increase its competitiveness and attractiveness among potential consumers.

Purification engineering of mono-diacylglycerol using creaming demulsification technique in 20 kg-scale

Glycerolysis is the easiest, cheapest, and most widely used method for producing monodiacylglycerol (MDAG). The crude MDAG resulting from chemical glycerolysis still contains a glycerol residue of more than 7.5% so it needs to be purified. Purification with a simple method using a creaming demulsification technique (CDT) on a laboratory scale has been proven to produce MDAG with a glycerol content of less than 1%. This study was aimed to apply CDT on a scale of 20 kg and determine the process conditions that need to be adjusted so that the results are not different from the laboratory scale. Through trial and error method, the process condition adjustment was done iteratively to produce MDAG glycerol content after purification of less than 1.5%. The initial content of crude MDAG was 12.48%, application of CDT on a scale of 20 kg produces pure MDAG with a glycerol residue content of 3.07% (without adjusting the process conditions) and was 1.15% (with adjusting the process conditions). The adjustments meant include: increasing the operating temperature from 65 to 70°C, changing the type of stirrer from a propeller into a 2-level impeller, applying the nozzle for electrolyte mixing, providing longer skim and cream separation opportunities (applying repeated settling), using 1.5 times more hot water for washing, the washing technique was set twice, the first washing using nozzle without stirring and the second using nozzle with stirring. The adjustments were able to increase the purity of the MDAG produced and has met the European Union and FAO/ WHO standards.

Characterization and on-line adjustment of the sagittal-bent Laue crystal profile

The sagittal-bent Laue monochromator can provide an ideal way to focus high-energy X-ray beams. However, the anticlastic curvature induced by sagittal bending has a great influence on the crystal performance. Thus, characterizing the bent-crystal shape is very important for predicting the performance of the bent-crystal monochromator. In this paper the crystal profile is measured by off-line optical metrology and on-line X-ray experiments. The off-line results showed that the bent-crystal surface could be well fitted to a saddle surface apart from a redundant cubic term which was related to the different couples applied on the crystal. On-line characterization of the meridional and the sagittal radius of the bent crystal includes double-crystal topography and ray-tracing measurement. In addition, the double-crystal topography experiment could be used as a quick diagnostic method for the bending condition adjustment. The sagittal radius of the bent crystal was characterized through a ray-tracing experiment by using a particularly designed tungsten mask. Moreover, rocking curves under different bending conditions were measured as well. The results were highly consistent with analytical results derived from the elastic theory. Furthermore, radii along different vertical positions under various bending conditions were measured and showed a quadratic relationship between the vertical positions and the meridional radii.

Methodological Aspects of Evaluation of Foundry Technologies Effectiveness

A brief analysis of the capabilities of the methodological evaluation of foundry technologies effectiveness is presented by the example of temperature condition adjustment of foundry procedure. It has been revealed that the methodological analysis as applied to different variants of foundry technologies allows determining the most effective ways of development of the foundry technology and increase in its efficiency. A reference to various examples shows the presence of the hidden reserves in foundry technologies. The authors conclude that the methodological analysis allows effective and timely adjustment in the development and modification of foundry technologies and enhancement of its effectiveness. The result of the conducted methodological evaluation is elaboration of the guidelines on the enhancement of foundry technologies effectiveness, aimed at the search of the hidden reserves of already functioning technologies.

DINAMIKA RUANG WISATA RELIGI MAKAM SUNAN GIRI DI KABUPATEN GRESIK

Space is the product of an activity, which involves economic and technical activities owned by a group of people, so it has political and strategic nature. The relationship between space and activity is very close, where the space has a concept of a container and content. This study concerns the dynamics of space in Sunan Giri Tomb formed because of the conflict and activities in the tomb tourist site. The visitors’s space dimension of Sunan Giri Tomb can not be physically limited as each visitor has his own movement space and purpose of his activities. The aim of this study is to analyze the dynamics of space for visitor’s activity in the tomb. The method used is descriptive qualitative, deciphering the visitor’s behavior as the research object. The finding shows that space once had a specific function, but because of the activity and condition adjustment at one time, then the dynamics in space happen. The dynamics contain changes in the function and meaning or the space character which is associated with the context of time and influenced by human activities.

Two Vanishing Points Error Estimation Based on Line Clustering and Condition Adjustment with Parameters

In close-range digital photogrammetry and computer vision, a major challenge is the automation of 3D reconstruction from 2D-images. And single image calibration is a fundamental task in these areas for research. It is known that camera parameters can be recovered by the vanishing points of three orthogonal directions. However, three reliable and well-distributed vanishing points are not always available. Therefore, how to estimate the error of two vanishing points is very significant for us to analyze the precision of camera calibration. New methods for vanishing point detection and error estimation are presented, which can be illustrated as follows. Firstly, the line clustering, which parallel to object lines and correspond to the vanishing points, are detected based on RANSAC (Random Sample Consensus). Secondly, "condition adjustment with parameters" is utilized to estimate a nonlinear error equation. Thirdly, the error of vanishing point is expressed by error ellipse that is derived by co-factor matrix according to adjustment principle. Finally, experimental results of vanishing points coordinates and their errors are shown and analyzed.

The Method of Complex Worthiness Assessment of an Engineering Object in the Process of its Use and Service

A focus of the paper is concerned with the issue that optimal actions of regulation, diagnostics and reliability tests of technical objects are required from the maintenance staff involved in their use and servicing, and on the other hand, that they are performed independently and autonomously in the current maintenance practice instead of being accomplished in a strictly coordinated and complex way. It was noticed that only one and common information on the object exists and provides a solid basis for coordination of the regulation, diagnostics and reliability tests. This information can be applied many times for solving various problems no matter if they concern regulation, diagnostics or reliability. Next, this paper presents an original approach of conversion of the considered information into explicit time-and-space determined “number of threshold value overshoots” of signals related to the object and its environment as well as theoretical foundations (based on various configurations of the state equation) for conversion of the considered piece of information, expressed by the aforementioned “numbers”, into the parameters of the object ability condition (i.e., its technical condition, adjustment and reliability). The theses of the presented complex method for the assessment of technical object ability were subjected to long-term verification with positive result in the study of the Allison 250 engine bearing system.