5 research outputs found
Disturbance impulse effects on large umbrella space reflector dynamics
Large umbrella space antennas are essential for communication, monitoring and observation of Earth and space objects. Despite investigations devoted to space antenna dynamics, the disturbance impulse shape effect on the root mean square error of spacecraft antenna reflecting surface has not been studied. This paper overcomes this gap describing disturbance impulse impact on root mean square error of spacecraftantenna reflecting surface relative to paraboloid via nonlinear finite element method. Based on numerical results root mean square dependency on disturbance time for rectangular and sine impulses was calculated. This approach could be applied in studying antenna reflecting surface response on disturbance impulse for different types of perspective large space antennas
Underground pipeline laying using the pipe-in-pipe system
The problems of resource saving and environmental safety during the installation and operation of the underwater crossings are always relevant. The paper describes the existing methods of trenchless pipeline technology, the structure of multi-channel pipelines, the types of supporting and guiding systems. The rational design is suggested for the pipe-in-pipe system. The finite element model is presented for the most dangerous sections of the inner pipes, the optimum distance is detected between the roller supports
Algorithm of iterative transformation for effective modules of multicomponent isotropic composite
We consider the effective modules of Voigt, Reiss for isotropic elastic composites. We have reformed the method for constructing iterative transformation of the upper and lower estimates of fork (Voigt-Reuss) towards two-component composite in case of an arbitrary number of components. The method is based on the fact that effective modules of Voigt and Reuss can be regarded as elementary symmetric functions introduced by Gauss. The conditions, which the iteratively β transformed efficient modules must fulfill at every iteration, are shown
ΠΡΠΎΠ³Π½ΠΎΠ·Π½Π°Ρ ΠΎΡΠ΅Π½ΠΊΠ° ΡΡΠ°Π΅ΠΊΡΠΎΡΠΈΠΈ ΡΡΠΊΠΈ ΠΎΠΏΠ΅ΡΠ°ΡΠΎΡΠ° Π΄Π»Ρ ΡΠ΅ΡΠ΅Π½ΠΈΡ ΠΎΠ±ΡΠ°ΡΠ½ΠΎΠΉ Π·Π°Π΄Π°ΡΠΈ Π΄ΠΈΠ½Π°ΠΌΠΈΠΊΠΈ ΠΏΡΠΈ ΠΊΠΎΠΏΠΈΡΡΡΡΠ΅ΠΌ ΡΠΏΡΠ°Π²Π»Π΅Π½ΠΈΠΈ
ΠΠ΄Π½ΠΎΠΉ ΠΈΠ· Π²Π°ΠΆΠ½Π΅ΠΉΡΠΈΡ
Π·Π°Π΄Π°Ρ ΡΠΎΠ²ΡΠ΅ΠΌΠ΅Π½Π½ΠΎΠΉ ΡΠΎΠ±ΠΎΡΠΎΡΠ΅Ρ
Π½ΠΈΠΊΠΈ ΡΠ²Π»ΡΠ΅ΡΡΡ ΡΠ°Π·ΡΠ°Π±ΠΎΡΠΊΠ° ΡΠΎΠ±ΠΎΡΠΎΠ² Π΄Π»Ρ Π²ΡΠΏΠΎΠ»Π½Π΅Π½ΠΈΡ ΡΡΡΠΈΠ½Π½ΡΡ
, Π²ΡΠ΅Π΄Π½ΡΡ
ΠΈ ΠΎΠΏΠ°ΡΠ½ΡΡ
Π²ΠΈΠ΄ΠΎΠ² ΡΠ°Π±ΠΎΡ Π±Π΅Π· Π½Π΅ΠΏΠΎΡΡΠ΅Π΄ΡΡΠ²Π΅Π½Π½ΠΎΠ³ΠΎ ΡΡΠ°ΡΡΠΈΡ ΡΠ΅Π»ΠΎΠ²Π΅ΠΊΠ°. ΠΠ΅ΡΠΌΠΎΡΡΡ Π½Π° Π°ΠΊΡΠΈΠ²Π½ΠΎΠ΅ ΡΠ°Π·Π²ΠΈΡΠΈΠ΅ ΡΠ΅Ρ
Π½ΠΎΠ»ΠΎΠ³ΠΈΠΉ ΠΈΡΠΊΡΡΡΡΠ²Π΅Π½Π½ΠΎΠ³ΠΎ ΠΈΠ½ΡΠ΅Π»Π»Π΅ΠΊΡΠ°, Π½Π° Π΄Π°Π½Π½ΡΠΉ ΠΌΠΎΠΌΠ΅Π½Ρ ΡΠΎΠ±ΠΎΡΠΎΡΠ΅Ρ
Π½ΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΡΠΈΡΡΠ΅ΠΌΡ Π½Π΅ ΡΠΏΠΎΡΠΎΠ±Π½Ρ Π·Π°ΠΌΠ΅Π½ΠΈΡΡ ΡΠ΅Π»ΠΎΠ²Π΅ΠΊΠ° ΠΏΡΠΈ ΡΠ΅ΡΠ΅Π½ΠΈΠΈ ΡΠ»ΠΎΠΆΠ½ΡΡ
Π·Π°Π΄Π°Ρ Π² Π΄ΠΈΠ½Π°ΠΌΠΈΡΠ΅ΡΠΊΠΎΠΉ ΡΡΠ΅Π΄Π΅. ΠΠ°ΠΈΠ±ΠΎΠ»Π΅Π΅ ΠΏΠ΅ΡΡΠΏΠ΅ΠΊΡΠΈΠ²Π½ΡΠΌΠΈ Π΄Π»Ρ ΠΏΡΠΈΠΌΠ΅Π½Π΅Π½ΠΈΡ Π² Π±Π»ΠΈΠΆΠ°ΠΉΡΠ΅Π΅ Π²ΡΠ΅ΠΌΡ ΡΠ²Π»ΡΡΡΡΡ ΡΠΎΠ±ΠΎΡΡ, ΡΠ΅Π°Π»ΠΈΠ·ΡΡΡΠΈΠ΅ ΠΊΠΎΠΏΠΈΡΡΡΡΠΈΠΉ ΡΠΈΠΏ ΡΠΏΡΠ°Π²Π»Π΅Π½ΠΈΡ, ΠΈΠ»ΠΈ ΡΠ°ΠΊ Π½Π°Π·ΡΠ²Π°Π΅ΠΌΠΎΠ΅ Π²ΠΈΡΡΡΠ°Π»ΡΠ½ΠΎΠ΅ ΠΏΡΠΈΡΡΡΡΡΠ²ΠΈΠ΅ ΠΎΠΏΠ΅ΡΠ°ΡΠΎΡΠ°. ΠΡΠΈΠ½ΡΠΈΠΏ ΠΊΠΎΠΏΠΈΡΡΡΡΠ΅Π³ΠΎ ΡΠΏΡΠ°Π²Π»Π΅Π½ΠΈΡ ΠΏΠΎΡΡΡΠΎΠ΅Π½ Π½Π° Π·Π°Ρ
Π²Π°ΡΠ΅ Π΄Π²ΠΈΠΆΠ΅Π½ΠΈΡ ΡΠ΄Π°Π»Π΅Π½Π½ΠΎ Π½Π°Ρ
ΠΎΠ΄ΡΡΠ΅Π³ΠΎΡΡ ΠΎΠΏΠ΅ΡΠ°ΡΠΎΡΠ° ΠΈ ΡΠΎΡΠΌΠΈΡΠΎΠ²Π°Π½ΠΈΠΈ ΡΠΏΡΠ°Π²Π»ΡΡΡΠΈΡ
ΡΠΈΠ³Π½Π°Π»ΠΎΠ² Π΄Π»Ρ ΠΏΡΠΈΠ²ΠΎΠ΄ΠΎΠ² ΡΠΎΠ±ΠΎΡΠ°. ΠΠ»Ρ ΡΠΏΡΠ°Π²Π»Π΅Π½ΠΈΡ ΠΏΡΠΈΠ²ΠΎΠ΄Π°ΠΌΠΈ ΠΌΠΎΠ³ΡΡ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°ΡΡΡΡ ΡΠ»Π΅Π΄ΡΡΠΈΠ΅ ΡΠΈΡΡΠ΅ΠΌΡ ΠΈΠ»ΠΈ ΡΠΈΡΡΠ΅ΠΌΡ Π½Π° ΠΎΡΠ½ΠΎΠ²Π΅ ΠΏΠ»Π°Π½ΠΈΡΠΎΠ²Π°Π½ΠΈΡ Π΄Π²ΠΈΠΆΠ΅Π½ΠΈΡ. Π‘Π»Π΅Π΄ΡΡΠΈΠ΅ ΡΠΈΡΡΠ΅ΠΌΡ Π±ΠΎΠ»Π΅Π΅ ΠΏΡΠΎΡΡΡ, ΠΎΠ΄Π½Π°ΠΊΠΎ ΡΠΈΡΡΠ΅ΠΌΡ Π½Π° ΠΎΡΠ½ΠΎΠ²Π΅ ΠΏΠ»Π°Π½ΠΈΡΠΎΠ²Π°Π½ΠΈΡ Π΄Π²ΠΈΠΆΠ΅Π½ΠΈΡ ΠΏΠΎΠ·Π²ΠΎΠ»ΡΡΡ Π΄ΠΎΠ±ΠΈΡΡΡΡ Π±ΠΎΠ»ΡΡΠ΅ΠΉ ΠΏΠ»Π°Π²Π½ΠΎΡΡΠΈ Π΄Π²ΠΈΠΆΠ΅Π½ΠΈΡ ΠΈ ΠΌΠ΅Π½ΡΡΠ΅Π³ΠΎ ΠΈΠ·Π½ΠΎΡΠ° Π΄Π΅ΡΠ°Π»Π΅ΠΉ ΠΎΠ±ΡΠ΅ΠΊΡΠ° ΡΠΏΡΠ°Π²Π»Π΅Π½ΠΈΡ. ΠΠ»Ρ ΡΠ΅Π°Π»ΠΈΠ·Π°ΡΠΈΠΈ ΡΠΏΡΠ°Π²Π»Π΅Π½ΠΈΡ Π½Π° ΠΎΡΠ½ΠΎΠ²Π΅ ΠΏΠ»Π°Π½ΠΈΡΠΎΠ²Π°Π½ΠΈΡ Π΄Π²ΠΈΠΆΠ΅Π½ΠΈΡ Π²Π²ΠΎΠ΄ΠΈΡΡΡ ΠΈΡΠΊΡΡΡΡΠ²Π΅Π½Π½Π°Ρ Π·Π°Π΄Π΅ΡΠΆΠΊΠ° ΠΌΠ΅ΠΆΠ΄Ρ Π΄Π²ΠΈΠΆΠ΅Π½ΠΈΡΠΌΠΈ ΠΎΠΏΠ΅ΡΠ°ΡΠΎΡΠ° ΠΈ ΠΎΠ±ΡΠ΅ΠΊΡΠ° ΡΠΏΡΠ°Π²Π»Π΅Π½ΠΈΡ Π΄Π»Ρ Π½Π°ΠΊΠΎΠΏΠ»Π΅Π½ΠΈΡ Π½Π΅ΠΎΠ±Ρ
ΠΎΠ΄ΠΈΠΌΡΡ
Π΄Π°Π½Π½ΡΡ
.
Π¦Π΅Π»Ρ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ β ΡΡΡΡΠ°Π½Π΅Π½ΠΈΠ΅ Π·Π°Π΄Π΅ΡΠΆΠΊΠΈ, Π²ΠΎΠ·Π½ΠΈΠΊΠ°ΡΡΠ΅ΠΉ ΠΏΡΠΈ ΡΠΏΡΠ°Π²Π»Π΅Π½ΠΈΠΈ ΠΏΡΠΈΠ²ΠΎΠ΄Π°ΠΌΠΈ Π°Π½ΡΡΠΎΠΏΠΎΠΌΠΎΡΡΠ½ΠΎΠ³ΠΎ ΠΌΠ°Π½ΠΈΠΏΡΠ»ΡΡΠΎΡΠ° Π½Π° ΠΎΡΠ½ΠΎΠ²Π΅ ΡΠ΅ΡΠ΅Π½ΠΈΡ ΠΎΠ±ΡΠ°ΡΠ½ΠΎΠΉ Π·Π°Π΄Π°ΡΠΈ Π΄ΠΈΠ½Π°ΠΌΠΈΠΊΠΈ ΠΏΡΠΈ ΠΊΠΎΠΏΠΈΡΡΡΡΠ΅ΠΌ ΡΠΈΠΏΠ΅ ΡΠΏΡΠ°Π²Π»Π΅Π½ΠΈΡ Π² ΠΌΠ°ΡΡΡΠ°Π±Π΅ ΡΠ΅Π°Π»ΡΠ½ΠΎΠ³ΠΎ Π²ΡΠ΅ΠΌΠ΅Π½ΠΈ. ΠΡΠ΅Π΄Π»Π°Π³Π°Π΅ΡΡΡ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°ΡΡ Π΄Π»Ρ ΠΏΠ»Π°Π½ΠΈΡΠΎΠ²Π°Π½ΠΈΡ Π΄Π²ΠΈΠΆΠ΅Π½ΠΈΡ Π½Π΅ ΠΈΠ·ΠΌΠ΅ΡΠ΅Π½Π½ΡΠ΅, Π° ΠΏΡΠΎΠ³Π½ΠΎΠ·Π½ΡΠ΅ Π·Π½Π°ΡΠ΅Π½ΠΈΡ ΠΎΠ±ΠΎΠ±ΡΠ΅Π½Π½ΡΡ
ΠΊΠΎΠΎΡΠ΄ΠΈΠ½Π°Ρ ΡΡΠΊΠΈ ΠΎΠΏΠ΅ΡΠ°ΡΠΎΡΠ°. ΠΠ° ΠΎΡΠ½ΠΎΠ²Π΅ ΠΈΠ·ΠΌΠ΅ΡΠ΅Π½Π½ΡΡ
Π·Π½Π°ΡΠ΅Π½ΠΈΠΉ ΠΎΠ±ΠΎΠ±ΡΠ΅Π½Π½ΡΡ
ΠΊΠΎΠΎΡΠ΄ΠΈΠ½Π°Ρ ΡΡΠΊΠΈ ΠΎΠΏΠ΅ΡΠ°ΡΠΎΡΠ° ΡΠΎΡΠΌΠΈΡΡΡΡΡΡ Π²ΡΠ΅ΠΌΠ΅Π½Π½ΡΠ΅ ΡΡΠ΄Ρ ΠΈ Π²ΡΠΏΠΎΠ»Π½ΡΠ΅ΡΡΡ ΠΈΡ
ΠΏΡΠΎΠ³Π½ΠΎΠ·ΠΈΡΠΎΠ²Π°Π½ΠΈΠ΅. ΠΡΠΎΠ³Π½ΠΎΠ·Π½ΡΠ΅ Π·Π½Π°ΡΠ΅Π½ΠΈΡ ΠΎΠ±ΠΎΠ±ΡΠ΅Π½Π½ΡΡ
ΠΊΠΎΠΎΡΠ΄ΠΈΠ½Π°Ρ ΠΈΡΠΏΠΎΠ»ΡΠ·ΡΡΡΡΡ ΠΏΡΠΈ ΠΏΠ»Π°Π½ΠΈΡΠΎΠ²Π°Π½ΠΈΠΈ ΡΡΠ°Π΅ΠΊΡΠΎΡΠΈΠΈ Π΄Π²ΠΈΠΆΠ΅Π½ΠΈΡ Π°Π½ΡΡΠΎΠΏΠΎΠΌΠΎΡΡΠ½ΠΎΠ³ΠΎ ΠΌΠ°Π½ΠΈΠΏΡΠ»ΡΡΠΎΡΠ° ΠΈ ΡΠ΅ΡΠ΅Π½ΠΈΠΈ ΠΎΠ±ΡΠ°ΡΠ½ΠΎΠΉ Π·Π°Π΄Π°ΡΠΈ Π΄ΠΈΠ½Π°ΠΌΠΈΠΊΠΈ. ΠΡΠΎΠ³Π½ΠΎΠ·ΠΈΡΠΎΠ²Π°Π½ΠΈΠ΅ ΠΎΡΡΡΠ΅ΡΡΠ²Π»ΡΠ΅ΡΡΡ ΠΌΠ΅ΡΠΎΠ΄ΠΎΠΌ Π»ΠΈΠ½Π΅ΠΉΠ½ΠΎΠΉ ΡΠ΅Π³ΡΠ΅ΡΡΠΈΠΈ, ΠΈΠΌΠ΅ΡΡΠΈΠΌ ΠΎΡΠ½ΠΎΡΠΈΡΠ΅Π»ΡΠ½ΠΎ ΠΌΠ°Π»ΡΡ Π²ΡΡΠΈΡΠ»ΠΈΡΠ΅Π»ΡΠ½ΡΡ ΡΠ»ΠΎΠΆΠ½ΠΎΡΡΡ, ΡΡΠΎ ΡΠ²Π»ΡΠ΅ΡΡΡ Π²Π°ΠΆΠ½ΡΠΌ ΠΊΡΠΈΡΠ΅ΡΠΈΠ΅ΠΌ Π΄Π»Ρ ΡΠ°Π±ΠΎΡΡ ΡΠΈΡΡΠ΅ΠΌΡ Π² ΠΌΠ°ΡΡΡΠ°Π±Π΅ ΡΠ΅Π°Π»ΡΠ½ΠΎΠ³ΠΎ Π²ΡΠ΅ΠΌΠ΅Π½ΠΈ.
Π Π°Π·ΡΠ°Π±ΠΎΡΠ°Π½Π½ΡΠΉ ΠΌΠ°ΡΠ΅ΠΌΠ°ΡΠΈΡΠ΅ΡΠΊΠΈΠΉ Π°ΠΏΠΏΠ°ΡΠ°Ρ ΠΏΠΎΠ·Π²ΠΎΠ»ΡΠ΅Ρ Π½Π° ΠΎΡΠ½ΠΎΠ²Π΅ ΠΏΠ°ΡΠ°ΠΌΠ΅ΡΡΠΎΠ² ΠΏΡΠΎΠ³Π½ΠΎΠ·ΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΠΈ ΠΌΠ°ΠΊΡΠΈΠΌΠ°Π»ΡΠ½ΡΡ
Π΄ΠΎΠΏΡΡΡΠΈΠΌΡΡ
ΡΡΠΊΠΎΡΠ΅Π½ΠΈΠΉ Π΄Π²ΠΈΠΆΠ΅Π½ΠΈΡ ΠΏΡΠΈΠ²ΠΎΠ΄ΠΎΠ² ΠΌΠ°Π½ΠΈΠΏΡΠ»ΡΡΠΎΡΠ° Π½Π°ΠΉΡΠΈ ΡΠ΅ΠΎΡΠ΅ΡΠΈΡΠ΅ΡΠΊΡΡ ΠΎΡΠ΅Π½ΠΊΡ ΠΏΡΠ΅Π΄Π΅Π»ΠΎΠ² Π·Π½Π°ΡΠ΅Π½ΠΈΠΉ ΠΎΡΠΈΠ±ΠΊΠΈ ΠΏΡΠΎΠ³Π½ΠΎΠ·ΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΡΡΠ°Π΅ΠΊΡΠΎΡΠΈΠΈ Π΄Π²ΠΈΠΆΠ΅Π½ΠΈΡ ΡΡΠΊΠΈ ΠΎΠΏΠ΅ΡΠ°ΡΠΎΡΠ° ΠΏΡΠΈ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΠΈ ΠΏΡΠ΅Π΄Π»Π°Π³Π°Π΅ΠΌΠΎΠ³ΠΎ ΠΏΠΎΠ΄Ρ
ΠΎΠ΄Π° Π΄Π»Ρ ΠΊΠΎΠ½ΠΊΡΠ΅ΡΠ½ΡΡ
Π·Π°Π΄Π°Ρ.
ΠΡΠΎΠ²Π΅Π΄Π΅Π½Π½Π°Ρ ΠΏΡΠΎΠ³ΡΠ°ΠΌΠΌΠ½Π°Ρ ΡΠΈΠΌΡΠ»ΡΡΠΈΡ Π² ΡΡΠ΅Π΄Π΅ Matlab ΠΏΠΎΠ΄ΡΠ²Π΅ΡΠ΄ΠΈΠ»Π° Π°Π΄Π΅ΠΊΠ²Π°ΡΠ½ΠΎΡΡΡ ΠΏΠΎΠ»ΡΡΠ΅Π½Π½ΠΎΠΉ ΡΠ΅ΠΎΡΠ΅ΡΠΈΡΠ΅ΡΠΊΠΎΠΉ ΠΎΡΠ΅Π½ΠΊΠΈ ΠΌΠ°ΠΊΡΠΈΠΌΠ°Π»ΡΠ½ΠΎΠ³ΠΎ Π·Π½Π°ΡΠ΅Π½ΠΈΡ ΠΎΡΠΈΠ±ΠΊΠΈ ΠΏΡΠΎΠ³Π½ΠΎΠ·ΠΈΡΠΎΠ²Π°Π½ΠΈΡ, Π° ΡΠ°ΠΊΠΆΠ΅ ΠΏΠ΅ΡΡΠΏΠ΅ΠΊΡΠΈΠ²Π½ΠΎΡΡΡ ΠΏΡΠ΅Π΄Π»Π°Π³Π°Π΅ΠΌΠΎΠ³ΠΎ ΠΏΠΎΠ΄Ρ
ΠΎΠ΄Π° Π΄Π»Ρ ΠΏΡΠΎΠ²Π΅ΡΠΊΠΈ Π½Π° ΠΏΡΠ°ΠΊΡΠΈΠΊΠ΅
Modeling large pneumatic reflectors based on innovative materials
Large pneumatic structures of deploying space reflector are highly efficient and significantly advantageous due to the following reasons: significant coverage at low material usage and deployment simplicity. At the same time experimental modeling of such structures is time-consuming and costly. So, numerical analysis of such structures is very important in preliminary design. This paper presents the mathematical problem statement of stress-strain state of pneumatic structures, as well as the modal analysis results for two pneumatic reflectors of 50 and 100 meters in size applying such materials as Kevlar and thin polyamide films. The above described problems were solved by well-known nonlinear finite element method