Abstract
Air springs have many advantages; besides, air spring dampers hold much promise for application in car suspension systems. A thermodynamic model of pneumatic elements is proposed in this study. Unlike the standard model generally accepted at present, this one does not imply that the rubber-cord membrane is absolutely flexible, and its middle surface is inextensible. The force and geometric characteristics of pneumatic elements not depending on the temperature are considered. Two examples of mathematical modeling of force and geometric characteristics of Firestone pneumatic springs with rubber-cord membranes of bellow and rolling-lobe types illustrate the proposed method. Compared to the standard model, the accuracy of coincidence with the experimental data has increased significantly.
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Abbreviations
- A e :
-
Effective area
- A ext :
-
Work of external forces
- A int :
-
Work of internal forces
- a int :
-
Specific work of internal forces
- β :
-
Specific heat sources external
- C x,p :
-
Isobaric heat capacity at constant height
- c E, c ε :
-
Specific heat capacity without deformation
- d :
-
Differential with respect to space
- d :
-
Differential with respect to time
- E :
-
Total energy
- E :
-
The green-St. venant strain tensor
- ε :
-
The infinitesimal strain tensor
- F :
-
Free energy (helmholtz potential)
- F :
-
Deformation gradient tensor
- G :
-
Free enthalpy (gibbs potential)
- I :
-
Unit tensor
- I E :
-
Enthalpy of deformation
- K :
-
Kinetic energy
- L E, L ε :
-
Latent heat tensor of deformation
- m :
-
Mass
- n :
-
Polytropic coefficient
- n :
-
Unit vector of the outer normal
- P :
-
Force
- p :
-
Absolute pressure
- p u :
-
Overpressure
- p atm :
-
Atmospheric pressure
- P E :
-
Reduced stress tensor (second piola-kirchhoff stress tensor)
- Q ext :
-
Heat from external sources
- q ext :
-
Specific heat from external sources
- q V :
-
Specific heat sources internal
- q :
-
Heat flux vector
- ρ :
-
Density
- S :
-
Entropy
- Σ :
-
Volume boundary
- T, θ :
-
Absolute temperature
- T :
-
Stress tensor
- t :
-
Time
- U :
-
Internal energy
- U E :
-
Deformation energy
- U θ :
-
Thermal energy
- u :
-
Specific internal energy
- u E :
-
Specific deformation energy
- u θ :
-
Specific thermal energy
- V :
-
Volume
- v :
-
Velocity
- x :
-
Height of pneumatic element
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The work was completed in Omsk State Technical University, Russia, Omsk.
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Korneyev Vladimir Sergeyevich is a Doctor of Science (Eng.) and Associate Professor at the Department of Foundations of the Theory of Mechanics and Automatic Control, Omsk State Technical University.
Korneyev Sergey Alexandrovich is a Doctor of Science (Eng.). He is a Professor at the Department of Foundations of the Theory of Mechanics and Automatic Control, Omsk State Technical University.
Shalay Viktor Vladimirovich is a Doctor of Science (Eng.). He is a Professor, an Honorary Worker of the Higher School of Russia, a President of Omsk State Technical University, and a Head of Transport, Oil and Gas Storage, Standardization, and Certification Department, Omsk State Technical University.
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Korneyev, V.S., Korneyev, S.A. & Shalay, V.V. The improvement of scientific foundations for the technical theory of pneumatic elements with rubber-cord membranes: thermo-dynamic model of force and geometric characteristics of air springs. J Mech Sci Technol 38, 49–65 (2024). https://doi.org/10.1007/s12206-023-1205-z
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DOI: https://doi.org/10.1007/s12206-023-1205-z