The current trend of technology development in the educational process is based on Internet communications, online calculations and mobile microprocessor gadgets. The article shows an example of developing a universal and reliable server platform for interactive online applications that can be used in the learning process. A web service implemented in the PERL programming language using secure CGI client-server technology is presented. The implementation of the technology is considered in detail on the example of a typical problem of the course "Technical Mechanics of Liquids and Gases" to determine the critical depth of flow in the open channel. The analysis of possibilities and - most importantly - limitations of various modern trends in the implementation of computer algebra systems in comparison with the development of an interactive web form of online calculations, which is developed specifically for each educational task. An experimental project of educational and methodical material with web forms of online calculation of individual tasks is a variant of modern universal online technology. This example combines a wide range of microprocessor gadgets and operating systems without restrictions. The calculations are presented in tabular format of the output of the entire volume of iterative calculations and graphical visualization of the results. Conclusions of calculations in a graphical format with scaling avoids conventionality or formal schematics in the process of analysis and conclusions about the results of the calculation. At each stage of using the web form, the size, size and format of data entry are controlled. The main purpose of the implementation of an interactive web form with the conclusion of scaled visualization of the results of calculations - to bring conditional learning examples to real practical calculations.
The paper considers the design of a two-component strain gauge construction for measuring pulsation characteristics in turbulent flows. The analysis is carried out and the shortcomings of the existing sensor models and their influence on the reliability and accuracy of the experimental results are shown. The limited frequency range of such sensors is also emphasized. The design of the previous types of sensors is based on a plate on which wire or film strain gauges are glued. In such models, the main part of the perceiving hydrodynamic pressure goes to the formation of stresses in the elastic plate, and only a small part (up to 4%) - to create stresses in the strain-sensitive elements. Such sensors require an increase in the size of sensitive elements, this causes an additional disturbance in the flow, which in turn also reduces the accuracy of the measurement. The use of glue in the design of the sensor is associated with adverse effects such as creep and aging of the glue. The proposed sensor used strain gauges in the form of constantan wires stretched parallel to each other, which helped to get rid of elastic plates and glue, and also reduced the size of the sensing element. A construction of the sensor is shown and its design is described. The sensor has a free vibration frequency in water of more than 300 Hz, which is more than an order of magnitude higher than the frequency of water flow oscillations. This allows a more accurate measurement of pulsation characteristics. The principle of operation of the strain gauge is considered. The presence in the construction of four correspondingly located tensile strands made it possible to measure the longitudinal and transverse components of the pulsation velocities in turbulent flows.
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