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D.G. Myasishchev, A.S. Vashutkin, A.S. Lorents Complete text of the article:Download article (pdf, 0.5MB )UDСUDC 621.825+62-592.1DOI:10.17238/issn0536-1036.2016.4.112AbstractThis article analyzes the potential increase of the relative speed of deformation of the elastic member in the calculating and dynamic system of a friction pair of “brake shoe (band) – counterface” of the automotive brake at the beginning and the end of braking, and therefore the corresponding components of a friction pair of a real brake to reduce the self-oscillations due to the compressed air supply on the friction surfaces during braking. The problem of the research is the theoretical attempt to analyze qualitatively the influence of the positive phys-ical phenomena of the investigated braking process of a vehicle wheel on the self-oscillations and their resonant consequences. We offer to use the technical and theoretical approaches related to the compressed air supply on the brake friction surface in the process of braking during the period of the friction pair entering in full contact, up to a complete stop of a wheel. Due to the high speed of airflow we should expect the fewer amounts of wear products in the micropits of surface roughness in the process of compressed air supply-ing during wheel braking and the kinematic friction into the variable clearance between the friction surfaces than without scavenging. In addition, the expected intensification of cool-ing of the friction surfaces is real. As a result, the undesirable smearing and vulcanization processes of the facing material are less active; and the elastic properties of the wheeled brake facing have a longer life, compared with the existing designs. This fact reduces the self-oscillations in the brake devices, which in case of possible short-term resonance phe-nomena are a source of noise of the wheeled automobile brakes and a reduction of increased wear of the friction facing material, as well as to a decrease of the response time of facing. As an example, the idealized diagram of a friction pair of a drum brake is mathematically modeled; the positive effects obtained after the introduction of the compressed air supply circuit in the current clearance of the friction pair in the process of closing and separation at the automobile braking action are reflected.AuthorsD.G. Myasishchev, Doctor of Engineering Sciences, Professor A.S. Vashutkin, Candidate of Engineering Sciences, Associate Professor A.S. Lorents, Postgraduate StudentAffiliationNorthern (Arctic) Federal University named after M.V. Lomonosov, Naberezhnaya Severnoy Dviny, 17, Arkhangelsk, 163002, Russian Federation;e-mail: d.myasishchev@narfu.ru, a.vashutkin@narfu.ru, a.lorents@narfu.ru Keywordslumber truck, brake device, reduction, self-oscillation.References1. Aleksandrov M.P. Tormoznye ustroystva v mashinostroenii [Braking Devices in Mechanical Engineering]. Moscow, 1965. 676 p. 2. Borisov S.M. Friktsionnye mufty i tormoza stroitel'nykh i dorozhnykh mashin [Friction Clutches and Brakes of Building and Road Machines]. Moscow, 1973. 167 p. 3. Vashutkin A.S., Ul'yanovskiy I.E., Myasishchev D.G. Teoreticheskoe issledovanie vliyaniya faktorov na rabotu tormoznogo mekhanizma pri podache szhatogo vozdukha mezhdu tormoznymi kolodkami i tormoznym barabanom [A Theoretical Study of the Influ-ence of Factors on the Brake Device at Pressure Air Supply Between the Brake Shoes and the Brake Drum]. Izvestiya Samarskogo nauchnogo tsentra RAN [Proceedings of the Samara Scientific Center of the Russian Academy of Sciences], 2011, pp. 946–949. 4. Myasishchev D.G., Vashutkin A.S., Shvetsov A.M. Sposob podachi szhatogo vozdukha na friktsionnye poverkhnosti tormoznogo mekhanizma i ustroystvo dlya ego osushchestvleniya [Pressure Air Supply Method on the Friction Surface of the Brake Device and a Device for Its Implementation]. Application for an Invention, no. 2012147970/11, 2012. 5. Kosterin Yu.I. Mekhanicheskie kolebaniya pri sukhom trenii [Mechanical Vibra-tions at Dry Friction]. Moscow, 1969. 76 p. 6. Kragel'skiy I.V. Trenie i iznos [Friction and Wear]. Moscow, 1968. 480 p. 7. Myasishchev D.G., Vashutkin A.S. Eksperimental'noe issledovanie funktsion-irovaniya barabannykh tormoznykh mekhanizmov avtolesovozov [Experimental Study of the Drum Brake Device Operation of Lumber Trucks]. Aktual'nye problemy razvitiya le-snogo kompleksa: materialy mezhdunar. nauch.- tekhn. konf., 7–9 dek. 2010 g. [Actual Problems of the Forestry Complex: Proc. Int. Sci. Eng. Conf., 7–9 December, 2010]. Volog-da, 2010, pp. 166–169. 8. Myasishchev D.G., Vashutkin A.S. Organizatsiya i planirovanie eksperi-mental'nogo issledovaniya podvoda szhatogo vozdukha mezhdu tormoznymi kolodkami i tormoznym barabanom v protsesse tormozheniya [Organization and Planning of the Exper-imental Study of Compressed Air Supply between the Brake Shoes and Brake Drum During Braking]. Lesnoy zhurnal, 2013, no. 1, pp. 70–77. 9. Myasishchev D.G., Vashutkin A.S. Rezul'taty eksperimental'nogo issledovaniya protsessa podvoda szhatogo vozdukha mezhdu friktsionnymi poverkhnostyami tormoznogo mekhanizma [The Results of an Experimental Study of Compressed Air Supply between the Drum Brake Friction Surfaces]. Lesnoy zhurnal, 2013, no. 4, pp. 40–46. 10. Myasishchev D.G., Vashutkin A.S., Shvetsov A.M. Matematicheskoe modeliro-vanie pnevmaticheskoy sistemy “istochnik vozdukha – zazor kolesnogo tormoza lesovoz-nogo avtomobilya – atmosfera” v protsesse tormozheniya [Mathematical Modeling of the Pneumatic System of “Air Source – Wheel Brake Clearance of a Lumber Truck – Atmos-phere” During Braking. Mir nauki, 2014, no. 12, pp. 58–61. 11. Myasishchev D.G., Vashutkin A.S., Shvetsov A.M. Optimizatsiya parametrov i kharakteristik kolesnogo tormoza lesotransportnoy mashiny s tsel'yu maksimizatsii tormoz-noy sily [Parameter Optimization of the Wheel Brake of a Timber Car with the Objective of Braking Force Maximization]. Lesnoy zhurnal, 2014, no. 6, pp. 82–87. Received on March 04, 2016 Reduction of Relaxation Oscillation Resonance of Wheel Brake Devicesof Lumber Trucks |
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