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Alexander V. Orlov
Kostroma State University
Evgeny L. Pashin
Kostroma State Argicultural Academy
IMPROVING THE METHOD OF PENDULUM IMPACTOR VERIFICATION IN REGARD TO ENERGY LOSS DUE TO FRICTION
Orlov A. V., Pashin E. L. Improving the method of pendulum impactor verification in regard to energy loss due to friction. Technologies & Quality. 2023. No 3(61). P. 17–22. (In Russ.) https://doi.org/10.34216/2587-6147-2023-3-61-17-22.
DOI: https://doi.org/10.34216/2587-6147-2023-3-61-17-22
УДК: 677.017.4:620.171.3
EDN: ZKJAJW
Publish date: 2023-09-08
Annotation: Article presents an attempt to improve the method of pendulum impactors, such as tensile strength testing machine K-1 in regard to energy loss due to friction. Analysis of existing methods suggests a discre- pancy caused by ignoring the relationship between the energy loss caused by the tested material sample and that caused by friction. This introduces a systemic error and limits the applicability of such testing machines. Thanks to the modern rotational motion registration methods it becomes possible to estimate the intensity of friction at different points of the pendulum’s trajectory. This leads to a model of friction forces’ magnitude consisting of a linear combination of known motion parameters, such as angular coordinate, velocity and acceleration. The coefficients of this model can be determined using the non-negative variant of the least- squares method. This algorithm has been implemented into a software module for the K-1 testing machine.
Keywords: pendulum, friction, verification, inertial momentum, angular velocity, energy loss, K-1 tensile strength tester
Literature list: 1. Orlov A. V., Pashin E. L. Measurement and testing system for tensile properties of fibers and threads undergoing high-speed stretching. Zavodskaja laboratorija. Diagnostika materialov [Factory laboratory. Material diagnostics]. 2019;2:60–64. (In Russ.) 2. GOST 10708–82. Kopry mayatnikovye. Tekhnicheskie usloviya [State Standart 10708–82. Pendulum impactors. Technical specifications]. Moscow, Publishing House of Standards, 1998. 8 p. (In Russ.) 3. GOST 34373–2017. Plastmassy. Verifikaciya mayatnikovogo kopra dlya ispytaniya na udar. Ispytanie na udarnuyu vyazkost' po SHarpi, Izodu i pri udarnom rastyazhenii [State Standart 34373–2017. Plastics Pendulum inspection for shock test. Charpy, Izod and impact tensile impact test]. Moscow, Standartin- form Publ., 2018. 33 p. (In Russ.) 4. Pashina L. V., Pashin E. L. Method of estimating flexibility of fibers or bast of bast plant strains. Russia patent no 2368902, published 27.09.2009, bulletin no 27. (In Russ.) 5. Artunin A. I. Taking into account friction forces in pendulum supports during research into the process of rotor autobalancing. Sovremennye tehnologii. Sistemnyj analiz. Modelirovanie [Modern technologies. System analysis. Modelling]. 2019;63,3:53–58. (In Russ.) 6. Orlov A. V., Pashin E. L. Improving algorithm of measuring tensile strength of textile fibers using pendulum-based testing machine. Izvestiya Vysshikh Uchebnykh Zavedenii. Seriya Teknologiya Tekstil'noi Promyshlennosti [Proceedings of Higher Educational Institutions. Series Textile Industry Technology]. 2022;1:103–107. (In Russ.) 7. LIR-158B. Incremental rotary encoder. SKB IS : website. URL: https://skbis.ru/catalog/rotary/ incremental-rotary-encoders/lir-158b (accessed 4.06.2023). 8. Orlov A. V., Pashin E. L. Modernization of measurement method of tensile properties of fibers using pendulum-based tensile strength testing machine. Dizajn i tehnologii [Design and technologies]. 2020;80:81–89. (In Russ.) 9. Linnik Yu. V. Least squares method and the basics of mathematical and statistical theory of observation processing. Moscow, Fizmatgiz Publ., 1962, 349 p. (In Russ.) 10. Vapnik V. N. Statistical learning theory. New York, John Wiley, 1998. 736 p. 11. Orlov A. V., Pashin E. L. Improving the method of calculating angular acceleration of active clamp on pendulum-based testing machine when measuring tensile strength of textile fibers. Izvestiya Vysshikh Uchebnykh Zavedenii. Seriya Teknologiya Tekstil'noi Promyshlennosti [Proceedings of Higher Educa- tional Institutions. Series Textile Industry Technology]. 2022;4:37–42. (In Russ.)
Author's info: Alexander V. Orlov, Kostroma State University, Kostroma, Russia, aorlov@list.ru, https://orcid.org/0000-0002-4995-3393
Co-author's info: Evgeny L. Pashin, Kostroma State Argicultural Academy, Kostroma, Russia, evgpashin@yandex.ru, https://orcid.org/0000-0002-5871-874Х