Flexible cross-corrugated shells are used to create flexible waveguides that connect rigid waveguides. They compensate for mounting stresses during assembly, provide temperature compensation and vibration damping. These waveguides are widely used in spacecraft communication systems, they are required – flexibility, mechanical strength, geometric accuracy and minimal energy loss when connected to the transmission line. In this paper, the process of corrugating rectangular profile pipes made of BrB 2 bronze to create transversely corrugated shells is investigated. Objectives of the work: 1) analysis of technological processes of corrugation of waveguide pipes to select the most accurate method; 2) conducting a numerical experiment to determine technological parameters. Based on the analysis of the methods of transverse corrugation, the most rational method of corrugation with a liquid punch on a solid matrix has been incorporated. The scientific novelty lies in the creation of a mathematical model based on the theory of bending moments and beam stretching. With its help, a mathematical experiment was carried out, which has an applied benefit for the calculations of technological operations, for the corrugation of a waveguide. The pressures necessary for corrugation for different corrugation geometries are found and patterns are revealed. The mathematical model has an applied use for preliminary calculations of technological operations of corrugation of rectangular pipes. The calculation allows you to choose the most optimal mode of the technological process: fluid pressure, deformation, change in yield strength, allowing you to produce a flexible waveguide qualitatively. The result of the calculations is useful in preliminary design to determine the size of the corrugating equipment and the effort required to implement the technological process of forming the corrugations of rectangular pipes.
{"title":"Mathematical modeling of cross-corrugated waveguide shell formation","authors":"V. V. Timofeev, I. V. Trifanov, E. V. Patraev","doi":"10.26732/j.st.2023.3.05","DOIUrl":"https://doi.org/10.26732/j.st.2023.3.05","url":null,"abstract":"Flexible cross-corrugated shells are used to create flexible waveguides that connect rigid waveguides. They compensate for mounting stresses during assembly, provide temperature compensation and vibration damping. These waveguides are widely used in spacecraft communication systems, they are required – flexibility, mechanical strength, geometric accuracy and minimal energy loss when connected to the transmission line. In this paper, the process of corrugating rectangular profile pipes made of BrB 2 bronze to create transversely corrugated shells is investigated. Objectives of the work: 1) analysis of technological processes of corrugation of waveguide pipes to select the most accurate method; 2) conducting a numerical experiment to determine technological parameters. Based on the analysis of the methods of transverse corrugation, the most rational method of corrugation with a liquid punch on a solid matrix has been incorporated. The scientific novelty lies in the creation of a mathematical model based on the theory of bending moments and beam stretching. With its help, a mathematical experiment was carried out, which has an applied benefit for the calculations of technological operations, for the corrugation of a waveguide. The pressures necessary for corrugation for different corrugation geometries are found and patterns are revealed. The mathematical model has an applied use for preliminary calculations of technological operations of corrugation of rectangular pipes. The calculation allows you to choose the most optimal mode of the technological process: fluid pressure, deformation, change in yield strength, allowing you to produce a flexible waveguide qualitatively. The result of the calculations is useful in preliminary design to determine the size of the corrugating equipment and the effort required to implement the technological process of forming the corrugations of rectangular pipes.","PeriodicalId":33896,"journal":{"name":"Kosmicheskie apparaty i tekhnologii","volume":"160 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135721890","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-26DOI: 10.26732/10.26732/j.st.2023.3.03
A. V. Shagov, V. V. Sukhotin, T. A. Zubov
The article discusses issues related to the development of a computer model of an on-board relay complex with linear signal retransmission for the analysis of phase distortion of the signal. It is very important to know the phase distortion (foray) when determining the coordinates of the radio source by the phase method using a virtual antenna array in satellite communication systems. The literature review given in the article showed that it was not possible to conduct these studies on existing computer models. Based on the classical version of the block diagram of the on-board relay complex, a computer model was developed in the MATLAB R 2016b (Simulink) environment. The model includes a receiving device, an input and output multiplexer and power amplifiers. Mathematical models of Saleh and Gorbanni amplifiers implemented on traveling wave lamps and solid-state amplifiers, respectively, were taken as nonlinear amplifiers. Multiplexers are implemented in the form of bandpass filters connected in parallel. The hybrid divider and ferrite circulators were not included in the model. In the model, it is possible to investigate the dependence of the phase distortion of the signal on the characteristics of the structural blocks of the on-board relay complex. The computer model also provides for the possibility of studying the effect of noise on phase distortion.
本文讨论了用于分析信号相位畸变的具有线性信号重传的星载继电器的计算机模型的开发问题。在卫星通信系统中，利用虚拟天线阵进行相位法确定射电源的坐标时，相位畸变(突进)的研究是非常重要的。文中给出的文献综述表明，不可能在现有的计算机模型上进行这些研究。在经典版板载继电器复合体框图的基础上，在MATLAB R 2016b (Simulink)环境下开发了计算机模型。该模型包括接收装置、输入输出多路复用器和功率放大器。将Saleh放大器和Gorbanni放大器分别实现在行波灯和固态放大器上的数学模型作为非线性放大器。多路复用器以并联的带通滤波器的形式实现。混合分压器和铁氧体环行器不包括在模型中。在该模型中，可以研究信号的相位畸变与板载继电器复合体结构块特性的依赖关系。计算机模型也为研究噪声对相位畸变的影响提供了可能性。
{"title":"Computer model of the transponder for the analysis of phase distortions of the signal","authors":"A. V. Shagov, V. V. Sukhotin, T. A. Zubov","doi":"10.26732/10.26732/j.st.2023.3.03","DOIUrl":"https://doi.org/10.26732/10.26732/j.st.2023.3.03","url":null,"abstract":"The article discusses issues related to the development of a computer model of an on-board relay complex with linear signal retransmission for the analysis of phase distortion of the signal. It is very important to know the phase distortion (foray) when determining the coordinates of the radio source by the phase method using a virtual antenna array in satellite communication systems. The literature review given in the article showed that it was not possible to conduct these studies on existing computer models. Based on the classical version of the block diagram of the on-board relay complex, a computer model was developed in the MATLAB R 2016b (Simulink) environment. The model includes a receiving device, an input and output multiplexer and power amplifiers. Mathematical models of Saleh and Gorbanni amplifiers implemented on traveling wave lamps and solid-state amplifiers, respectively, were taken as nonlinear amplifiers. Multiplexers are implemented in the form of bandpass filters connected in parallel. The hybrid divider and ferrite circulators were not included in the model. In the model, it is possible to investigate the dependence of the phase distortion of the signal on the characteristics of the structural blocks of the on-board relay complex. The computer model also provides for the possibility of studying the effect of noise on phase distortion.","PeriodicalId":33896,"journal":{"name":"Kosmicheskie apparaty i tekhnologii","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135721034","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. S. Titova, A. S. Sablin, M. A. Zagainov, S. A. Kuznetsov
An executive precision universal mechatronic module is considered, which allows performing precision rotational motion of the output kinematic link. The universal mechatronic module is designed to create the kinematics of mechatronic guidance systems and positioning of objects of aerospace technology. The key features of the executive precision universal mechatronic module are high positioning accuracy, low weight and overall dimensions. The aim of the work is to create a finite element model and analyze dynamic loads to assess the resistance of the structure to external vibration loads. The first section describes the creation of a finite element model taking into account the radial and axial stiffness of the supporting structural elements. The second section describes performing static analysis to create a preloaded state, and performing dynamic analysis. The influence of sinusoidal and random vibrations is investigated, the natural frequencies of the universal mechatronic module design are determined.
{"title":"Features of dynamic load analysis of spacecraft rotational drive mechanisms","authors":"A. S. Titova, A. S. Sablin, M. A. Zagainov, S. A. Kuznetsov","doi":"10.26732/j.st.2023.3.02","DOIUrl":"https://doi.org/10.26732/j.st.2023.3.02","url":null,"abstract":"An executive precision universal mechatronic module is considered, which allows performing precision rotational motion of the output kinematic link. The universal mechatronic module is designed to create the kinematics of mechatronic guidance systems and positioning of objects of aerospace technology. The key features of the executive precision universal mechatronic module are high positioning accuracy, low weight and overall dimensions. The aim of the work is to create a finite element model and analyze dynamic loads to assess the resistance of the structure to external vibration loads. The first section describes the creation of a finite element model taking into account the radial and axial stiffness of the supporting structural elements. The second section describes performing static analysis to create a preloaded state, and performing dynamic analysis. The influence of sinusoidal and random vibrations is investigated, the natural frequencies of the universal mechatronic module design are determined.","PeriodicalId":33896,"journal":{"name":"Kosmicheskie apparaty i tekhnologii","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135721887","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Currently, the exploration of the planet Venus is a very relevant and developing direction in space science. The development of rocket and space technologies has expanded the boundaries of accessibility of spacecraft to objects in the Solar System, allow for entire interplanetary expeditions, including flights to terrestrial planets, giant planets, and the outskirts of the Solar System. Currently, a program of planetary exploration for the next decades is being formed. Studying the history of expeditions to Venus and Mars clarifies the need to develop and improve methods for studying the atmosphere of the nearest planets to Earth, in particular, Venus, using vailable technical means, making them as efficient as possible. The exploration of Venus is proposed to be carried out using a technical means– a multirotor aircraft. This object is allocated as a system, and its role in the composition of the supersystem is also defined and described. The paper identifies scenarios for the functioning of the flying apparatus are highlighted, the tasks of its subsystems are described, as well as their interaction with each other. The main external factors affecting the work of the subsystems of the multirotor aircraft are presented. A functional scheme of the system is developed, as well as the main indicators used to assess the effectiveness of achieving the target task. This work is a preliminary stage before building a mathematical model.
{"title":"System engineering research of a multirotor aircraft as a prospective technical means of exploring the atmosphere and surface of the planet Venus","authors":"M. Yu. Yatsenko, V. A. Vorontsov, V. V. Ryzhkov","doi":"10.26732/j.st.2023.3.06","DOIUrl":"https://doi.org/10.26732/j.st.2023.3.06","url":null,"abstract":"Currently, the exploration of the planet Venus is a very relevant and developing direction in space science. The development of rocket and space technologies has expanded the boundaries of accessibility of spacecraft to objects in the Solar System, allow for entire interplanetary expeditions, including flights to terrestrial planets, giant planets, and the outskirts of the Solar System. Currently, a program of planetary exploration for the next decades is being formed. Studying the history of expeditions to Venus and Mars clarifies the need to develop and improve methods for studying the atmosphere of the nearest planets to Earth, in particular, Venus, using vailable technical means, making them as efficient as possible. The exploration of Venus is proposed to be carried out using a technical means– a multirotor aircraft. This object is allocated as a system, and its role in the composition of the supersystem is also defined and described. The paper identifies scenarios for the functioning of the flying apparatus are highlighted, the tasks of its subsystems are described, as well as their interaction with each other. The main external factors affecting the work of the subsystems of the multirotor aircraft are presented. A functional scheme of the system is developed, as well as the main indicators used to assess the effectiveness of achieving the target task. This work is a preliminary stage before building a mathematical model.","PeriodicalId":33896,"journal":{"name":"Kosmicheskie apparaty i tekhnologii","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135721889","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
An important design component of space antenna reflectors is a reflecting surface. At present, metallic knitted mesh fabric is most often used as a reflective surface; it fully meets the requirements for such surfaces in terms of physical and mechanical properties. Particularly important characteristics for large-sized reflectors are low specific gravity and high light transmission coefficient, which a mesh with coarse cells provides. However, the structural features of this mesh fabric impose additional requirements on its use as a reflective surface for large-sized transformable reflectors. The article deals with a special approach to designing patterns for a reflective surface made of mesh with coarse cells. The developed pattern cutting option allows to obtain a reflective surface with the least distortion (error), in accordance formulated criteria. The authors have suggested the option of obtaining cutting patterns of metallic mesh fabric, described the advantages of the proposed option over the classical one. The cutting pattern of the parabolic surface for the offset reflector was obtained. The proposed cutting pattern option was analyzed. Furthermore, optimization was carried out, which made it possible to maintain the integrity of the cellular structure of patterns along one loop row. The compared results show that the developed cutting pattern option completely complies with the requirements and it can be used to form a reflective surface from the metallic knitted mesh with coarse cells.
{"title":"Development method of splitting the radio-reflective large-sized reflector surface into cutting patterns made of mesh with coarse cells","authors":"A. V. Ivanov, K. A. Kushnir, M. S. Simonova","doi":"10.26732/j.st.2023.3.04","DOIUrl":"https://doi.org/10.26732/j.st.2023.3.04","url":null,"abstract":"An important design component of space antenna reflectors is a reflecting surface. At present, metallic knitted mesh fabric is most often used as a reflective surface; it fully meets the requirements for such surfaces in terms of physical and mechanical properties. Particularly important characteristics for large-sized reflectors are low specific gravity and high light transmission coefficient, which a mesh with coarse cells provides. However, the structural features of this mesh fabric impose additional requirements on its use as a reflective surface for large-sized transformable reflectors. The article deals with a special approach to designing patterns for a reflective surface made of mesh with coarse cells. The developed pattern cutting option allows to obtain a reflective surface with the least distortion (error), in accordance formulated criteria. The authors have suggested the option of obtaining cutting patterns of metallic mesh fabric, described the advantages of the proposed option over the classical one. The cutting pattern of the parabolic surface for the offset reflector was obtained. The proposed cutting pattern option was analyzed. Furthermore, optimization was carried out, which made it possible to maintain the integrity of the cellular structure of patterns along one loop row. The compared results show that the developed cutting pattern option completely complies with the requirements and it can be used to form a reflective surface from the metallic knitted mesh with coarse cells.","PeriodicalId":33896,"journal":{"name":"Kosmicheskie apparaty i tekhnologii","volume":"192 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135721891","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. D. Shirokov, D. A. Feoktistov, T. G. Oreshenko, M. S. Fedorov, A. V. Chubar
The aim of the work was to clarify the possibility of determining the frequency characteristics of load devices according to the parameters of transients, the rate of rise of the leading edge, its duration, the presence or absence of overshoot, the form of the transient process. The main objective of the study was to determine the load parameters required to perform the calculation. To confirm this hypothesis about the influence of the selected parameters, the method of physical experiment was used. The specification of indicators for operational parameters may be relevant when organizing the input control of incoming purchased products for various applied tasks. The improvement of input control algorithms, the implementation of time characteristics checks instead of frequency ones will confirm the compliance of the characteristics declared by the manufacturer or supplier of this equipment and provide the possibility of identifying the internal structure of devices to ensure their compatibility with other equipment used in production, as well as expand the technological capabilities of enterprises. The indicated problem seems promising for a number of organizations operating complex electronic equipment, as well as for domestic manufacturers of electronic devices. The relevance of the study also lies in reducing the amount required for the verification process of equipment by increasing the computational load. In addition, dynamic identification by transient parameters increases the speed of verification.
{"title":"Verification of frequency characteristics of load devices declared by the manufacturer","authors":"A. D. Shirokov, D. A. Feoktistov, T. G. Oreshenko, M. S. Fedorov, A. V. Chubar","doi":"10.26732/j.st.2023.3.01","DOIUrl":"https://doi.org/10.26732/j.st.2023.3.01","url":null,"abstract":"The aim of the work was to clarify the possibility of determining the frequency characteristics of load devices according to the parameters of transients, the rate of rise of the leading edge, its duration, the presence or absence of overshoot, the form of the transient process. The main objective of the study was to determine the load parameters required to perform the calculation. To confirm this hypothesis about the influence of the selected parameters, the method of physical experiment was used. The specification of indicators for operational parameters may be relevant when organizing the input control of incoming purchased products for various applied tasks. The improvement of input control algorithms, the implementation of time characteristics checks instead of frequency ones will confirm the compliance of the characteristics declared by the manufacturer or supplier of this equipment and provide the possibility of identifying the internal structure of devices to ensure their compatibility with other equipment used in production, as well as expand the technological capabilities of enterprises. The indicated problem seems promising for a number of organizations operating complex electronic equipment, as well as for domestic manufacturers of electronic devices. The relevance of the study also lies in reducing the amount required for the verification process of equipment by increasing the computational load. In addition, dynamic identification by transient parameters increases the speed of verification.","PeriodicalId":33896,"journal":{"name":"Kosmicheskie apparaty i tekhnologii","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135721894","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Y. Zhukov, E. B. Korotkov, S. Matveev, N. Slobodzyan, O. Shirobokov
The work is devoted to the protection of a spacecraft from the influence of unacceptable internal vibration sources. The urgency of reducing the vibration activity on board the spacecraft to improve the accuracy of the target equipment is indicated. A particular problem of vibration protection of the spacecraft platform from a vibration source – an electric pump unit of a liquid thermal control system – is being solved. The basic requirements for electric pump unit vibration protection have been determined. Possible ways to reduce the level of vibration excited by the electric pump unit on the surface of the spacecraft fixation are considered. Particular attention is paid to such vibration protection methods as damping and vibration isolation, implemented by installing special vibration protection devices between the source (electric pump unit) and the object (spacecraft) – vibration isolators and vibration dampers. The principles of operation of vibration dampers and vibration isolators, the most common materials for vibration dampers are described. Examples of constructive solutions for linear single-axial vibration isolators are considered, recommendations for the use of promising products are developed. Particularemphasis is placed on the use of metal rubber as a material for vibration isolators. With regard to a specific design of electric pump unit, a diagram of the spatial structure of vibration isolation is proposed. Formulas for calculation are given in detail, a mathematical model of the vibration isolation system is developed. The procedure for calculating the parameters of the system has been formed. Based on the model, the maximum possible level of vibration suppression in the mid-frequency region was determined. Minimum required number of operable pixels was identified for monitoring the water surface with sufficient accuracy and reliability.
{"title":"Protection of precision spacecraft equipment from internal sources of vibration","authors":"Y. Zhukov, E. B. Korotkov, S. Matveev, N. Slobodzyan, O. Shirobokov","doi":"10.26732/j.st.2021.4.05","DOIUrl":"https://doi.org/10.26732/j.st.2021.4.05","url":null,"abstract":"The work is devoted to the protection of a spacecraft from the influence of unacceptable internal vibration sources. The urgency of reducing the vibration activity on board the spacecraft to improve the accuracy of the target equipment is indicated. A particular problem of vibration protection of the spacecraft platform from a vibration source – an electric pump unit of a liquid thermal control system – is being solved. The basic requirements for electric pump unit vibration protection have been determined. Possible ways to reduce the level of vibration excited by the electric pump unit on the surface of the spacecraft fixation are considered. Particular attention is paid to such vibration protection methods as damping and vibration isolation, implemented by installing special vibration protection devices between the source (electric pump unit) and the object (spacecraft) – vibration isolators and vibration dampers. The principles of operation of vibration dampers and vibration isolators, the most common materials for vibration dampers are described. Examples of constructive solutions for linear single-axial vibration isolators are considered, recommendations for the use of promising products are developed. Particularemphasis is placed on the use of metal rubber as a material for vibration isolators. With regard to a specific design of electric pump unit, a diagram of the spatial structure of vibration isolation is proposed. Formulas for calculation are given in detail, a mathematical model of the vibration isolation system is developed. The procedure for calculating the parameters of the system has been formed. Based on the model, the maximum possible level of vibration suppression in the mid-frequency region was determined. Minimum required number of operable pixels was identified for monitoring the water surface with sufficient accuracy and reliability.","PeriodicalId":33896,"journal":{"name":"Kosmicheskie apparaty i tekhnologii","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41403172","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Composite materials are widely used in the production of aircraft for various purposes. Having several unique properties, composites, due to their heterogeneous structure, are poorly resistant to shock loads. Impulse action spreads inside the material in the form of stress waves, which are reflected on internal inhomogeneities, can overlap, and create very significant bursts of stress. This often leads to the well-known types of failure – spalling and delamination. Practice shows that these fractures occur almost immediately after the loading impulse. To verify the spalling strength, it is necessary to consider the initial unsteady phase of the response to the external impulse. There are sufficiently reliable theories to verify this strength; usually, they do not take transverse shear into account, otherwise the solution becomes unnecessarily cumbersome and poorly observable. Nevertheless, attempts are often made to refine the calculations by approximate consideration of transverse shear. This article presents the wave theory of laminated plates with approximate consideration of transverse shear. The possibility of specifying the calculation of impulse-loaded plates is considered. The inconsistency of the resulting model is proved.
{"title":"Wave theory of the laminated plates with approximate consideration of the transverse shear","authors":"A. Sibiryakov","doi":"10.26732/j.st.2021.4.07","DOIUrl":"https://doi.org/10.26732/j.st.2021.4.07","url":null,"abstract":"Composite materials are widely used in the production of aircraft for various purposes. Having several unique properties, composites, due to their heterogeneous structure, are poorly resistant to shock loads. Impulse action spreads inside the material in the form of stress waves, which are reflected on internal inhomogeneities, can overlap, and create very significant bursts of stress. This often leads to the well-known types of failure – spalling and delamination. Practice shows that these fractures occur almost immediately after the loading impulse. To verify the spalling strength, it is necessary to consider the initial unsteady phase of the response to the external impulse. There are sufficiently reliable theories to verify this strength; usually, they do not take transverse shear into account, otherwise the solution becomes unnecessarily cumbersome and poorly observable. Nevertheless, attempts are often made to refine the calculations by approximate consideration of transverse shear. This article presents the wave theory of laminated plates with approximate consideration of transverse shear. The possibility of specifying the calculation of impulse-loaded plates is considered. The inconsistency of the resulting model is proved.","PeriodicalId":33896,"journal":{"name":"Kosmicheskie apparaty i tekhnologii","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49302147","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The work is devoted to the reliability and effectiveness of the water surface remote monitoring space system. Analysis of existing monitoring methods has shown a high potential for using nanosatellites to solve the problem. As an object of study, 3U CubeSat was chosen with a payload placed on board in the form of a hyperspectral camera. To assess the reliability of the system, a mathematical model on the failure rates of subsystems is proposed. The structural and parametric reliability of the object was investigated in the Windchill Risk and Reliability software complex, taking into account the cyclogram of work and the specifics of the degradation process of individual components due to the influence of an aggressive space environment. To assess the effectiveness of the nanosatellite application, the dependence of the accuracy of determining water pollution on the operability of the photodetector was analyzed, since the photodetector is the central link in the transmission of optical information. The effective measurement of brightness spectral coefficients over the entire service life of nanosatellite is also obtained. Minimum required number of operable pixels was identified for monitoring the water surface with sufficient accuracy and reliability.
{"title":"The reliability evaluation of the water surface remote monitoring satellite equipment","authors":"A. D. Gubarev, I. L. Yaschuk, Ya. V. Khilinskaya","doi":"10.26732/j.st.2021.4.08","DOIUrl":"https://doi.org/10.26732/j.st.2021.4.08","url":null,"abstract":"The work is devoted to the reliability and effectiveness of the water surface remote monitoring space system. Analysis of existing monitoring methods has shown a high potential for using nanosatellites to solve the problem. As an object of study, 3U CubeSat was chosen with a payload placed on board in the form of a hyperspectral camera. To assess the reliability of the system, a mathematical model on the failure rates of subsystems is proposed. The structural and parametric reliability of the object was investigated in the Windchill Risk and Reliability software complex, taking into account the cyclogram of work and the specifics of the degradation process of individual components due to the influence of an aggressive space environment. To assess the effectiveness of the nanosatellite application, the dependence of the accuracy of determining water pollution on the operability of the photodetector was analyzed, since the photodetector is the central link in the transmission of optical information. The effective measurement of brightness spectral coefficients over the entire service life of nanosatellite is also obtained. Minimum required number of operable pixels was identified for monitoring the water surface with sufficient accuracy and reliability.","PeriodicalId":33896,"journal":{"name":"Kosmicheskie apparaty i tekhnologii","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45721074","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
During the verification of the functioning of the transformed structures in ground conditions, it is necessary to minimize the effect of gravity in order to exclude the occurrence of additional loads on the hinge assemblies and opening mechanisms. To perform this task, when testing a transformable umbrella-type reflector, stands with an active gravity compensation system are used, in which the gravity compensation force is applied to each spoke of the reflector. However, when compensating for the gravity spokes of the reflector, the fixing point of the suspension cable does not coincide with the center of mass of the spoke, which leads to the appearance of additional moments of forces acting on the suspended structure. Therefore, as an object of research, a part of the reflector was considered, consisting of a spoke, with cords of a formforming structure attached to it and a mesh. A 3D model has been developed, using which the positions of the center of mass of the structure under consideration were determined in the key phases of the reflector opening. A computational analysis of the driving forces and moments acting on the structure in the process of disclosure is carried out. The degree of influence of the suspension point position on the inaccuracy of gravity compensation has been established. The results of the analysis presented in the article can be used as initial data for the development of an algorithm for the operation of an active gravity compensation system, which will be able to take into account the position of the suspension point and the center of mass of the structure relative to the axis of rotation of the spoke during the opening of the reflector, by changing the gravity compensation force.
{"title":"Analysis of the umbrella-type reflector opening process on a stand with an active gravity compensation system","authors":"A. V. Ivanov, S. A. Zommer","doi":"10.26732/j.st.2021.4.04","DOIUrl":"https://doi.org/10.26732/j.st.2021.4.04","url":null,"abstract":"During the verification of the functioning of the transformed structures in ground conditions, it is necessary to minimize the effect of gravity in order to exclude the occurrence of additional loads on the hinge assemblies and opening mechanisms. To perform this task, when testing a transformable umbrella-type reflector, stands with an active gravity compensation system are used, in which the gravity compensation force is applied to each spoke of the reflector. However, when compensating for the gravity spokes of the reflector, the fixing point of the suspension cable does not coincide with the center of mass of the spoke, which leads to the appearance of additional moments of forces acting on the suspended structure. Therefore, as an object of research, a part of the reflector was considered, consisting of a spoke, with cords of a formforming structure attached to it and a mesh. A 3D model has been developed, using which the positions of the center of mass of the structure under consideration were determined in the key phases of the reflector opening. A computational analysis of the driving forces and moments acting on the structure in the process of disclosure is carried out. The degree of influence of the suspension point position on the inaccuracy of gravity compensation has been established. The results of the analysis presented in the article can be used as initial data for the development of an algorithm for the operation of an active gravity compensation system, which will be able to take into account the position of the suspension point and the center of mass of the structure relative to the axis of rotation of the spoke during the opening of the reflector, by changing the gravity compensation force.","PeriodicalId":33896,"journal":{"name":"Kosmicheskie apparaty i tekhnologii","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49170181","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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