Materials Research Society symposia proceedings. Materials Research Society最新文献_第3页

Buckling and post-buckling response of curved, composite, stiffened panels under combined loads including pressurization 弯曲、复合、加筋板在包括加压在内的组合荷载下的屈曲和后屈曲响应

Materials Research Society symposia proceedings. Materials Research Society Pub Date : 2023-11-01 DOI: 10.21741/9781644902813-93

L. Boni

{"title":"Buckling and post-buckling response of curved, composite, stiffened panels under combined loads including pressurization","authors":"L. Boni","doi":"10.21741/9781644902813-93","DOIUrl":"https://doi.org/10.21741/9781644902813-93","url":null,"abstract":"Abstract. In recent years, metal stiffened shells for aerospace applications have been gradually replaced by composite shells, which are widely used in fuselage, tail, and wing structures due to their advantageous properties. Under operating conditions, stiffened panels are subjected to different types of loads, combined in various ways, which can lead to instability. Like their metallic counterparts, allowing post-buckling within the operational envelope could lead to significant weight reductions for composite structures, but unlike the metal case, their response in this state is not fully understood and the potential of composites is not fully exploited. In this context, the main objective of the present work is to investigate the buckling and post-buckling behavior of composite curved panels subjected to combined loads. The buckling behavior of a representative stiffened curved panel has been simulated by non-linear finite element analyses, from the simplest pure compression and pure shear cases to the final analysis of the panel subjected to pressurization, shear, and compression simultaneously. The results of this study quantify the reduction of the critical compression and shear loads due to their simultaneous action, as well as the effect of the pressurization load, which was generally beneficial, but remarkably so in the case of pure shear.","PeriodicalId":87445,"journal":{"name":"Materials Research Society symposia proceedings. Materials Research Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135370934","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}

引用次数: 0

1D numerical simulations aimed to reproduce the operative conditions of a LOx/LCH4 engine demonstrator 一维数值模拟旨在重现液氧/LCH4发动机演示器的工作条件

Materials Research Society symposia proceedings. Materials Research Society Pub Date : 2023-11-01 DOI: 10.21741/9781644902813-141

A. Romano

引用次数: 0

Numerical and experimental studies on BLI propulsor architectures BLI推进器结构的数值与实验研究

Materials Research Society symposia proceedings. Materials Research Society Pub Date : 2023-11-01 DOI: 10.21741/9781644902813-14

A. Battiston

引用次数: 0

Recent developments about hybrid propelled aircraft: a short review 混合动力飞机的最新发展:一个简短的回顾

Materials Research Society symposia proceedings. Materials Research Society Pub Date : 2023-11-01 DOI: 10.21741/9781644902813-99

L.M. Cardone

引用次数: 0

The new transmitting antenna for BIRALES BIRALES的新型发射天线

Materials Research Society symposia proceedings. Materials Research Society Pub Date : 2023-11-01 DOI: 10.21741/9781644902813-104

G. Bianchi

{"title":"The new transmitting antenna for BIRALES","authors":"G. Bianchi","doi":"10.21741/9781644902813-104","DOIUrl":"https://doi.org/10.21741/9781644902813-104","url":null,"abstract":"Abstract. In the last decades the increasing Resident Space Objects (RSOs) population is fostering many Space Surveillance and Tracking (SST) initiatives, which are currently based on the use of ground sensors. These can be distinguished in optical, laser and radar and categorized in tracking and survey sensors. In particular, the survey radars allow to determine the orbit of both catalogued and uncatalogued objects. Italy contributes to the European SST (EUSST) activities with the BIstatic RAdar for LEo Survey (BIRALES), whose transmitter is the Radio Frequency Transmitter (TRF), located at the Italian Joint Test Range of Salto di Quirra in Sardinia, and whose receiver is a portion of the Northern Cross Radio Telescope, located at the Medicina Radio Astronomical Station, near Bologna. The current sensor configuration is undergoing an upgrade process, including the receiver field of view extension and a new transmitter station. The purpose of the work is to present the new transmitting antenna of BIRALES, showing its technological progress and the potential for the monitoring of space debris. The final objective is to produce a high technological radar to improve the performance of the EUSST sensors network. In particular, the aim is to increase both the number of detectable objects and the sensitivity to detect fragments of a few centimetres up to an altitude of 2,000 km, with a remarkable improvement of orbit determination procedures and quality. The transmitting antenna has been designed to be very flexible for any type of observations, modifying its parameters depending on the observation needs and according to the service to offer (monitoring of fragments, re-entry or for collision avoidance). The work presents the system architecture and the transmitting antenna structure, and the performance are assessed through numerical simulations.","PeriodicalId":87445,"journal":{"name":"Materials Research Society symposia proceedings. Materials Research Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135116449","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}

引用次数: 0

Assessment and optimization of dynamic stall semi-empirical model for pitching aerofoils 俯仰翼型动态失速半经验模型评估与优化

Materials Research Society symposia proceedings. Materials Research Society Pub Date : 2023-11-01 DOI: 10.21741/9781644902813-34

E. Galli

{"title":"Assessment and optimization of dynamic stall semi-empirical model for pitching aerofoils","authors":"E. Galli","doi":"10.21741/9781644902813-34","DOIUrl":"https://doi.org/10.21741/9781644902813-34","url":null,"abstract":"Abstract. Dynamic stall is a phenomenon affecting aerofoils in unsteady flows which is particularly relevant in the helicopter field. Semi-empirical models are reliable tools to simulate this phenomenon, especially during preliminary design phases and for aeroelastic assessments. However, they need a large number of tuning parameters to provide reliable estimations of unsteady airloads. To face this problem, a parameter identification procedure based on sequential resolutions of optimization problems by means of a Genetic Algorithm is developed and it is applied to the state-space formulation of a modified version of the so-called \"Second Generation” Leishman-Beddoes model. The effects of the optimal parameters on the model prediction capabilities are discussed and the variability of the parameters with reduced frequency is studied. The estimations of the unsteady airloads obtained by applying the optimization of parameters show a great improvement in the correlation of the experimental data if compared to the predictions obtained by using the parameters provided in literature, especially for pitching moments where the negative peaks are very well described. These improvements justify the need for optimization to set the parameters.","PeriodicalId":87445,"journal":{"name":"Materials Research Society symposia proceedings. Materials Research Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135116712","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}

引用次数: 0

Morphing technology for gust alleviation: an UAS application 缓解阵风的变形技术:无人机应用

Materials Research Society symposia proceedings. Materials Research Society Pub Date : 2023-11-01 DOI: 10.21741/9781644902813-29

F. Montano

{"title":"Morphing technology for gust alleviation: an UAS application","authors":"F. Montano","doi":"10.21741/9781644902813-29","DOIUrl":"https://doi.org/10.21741/9781644902813-29","url":null,"abstract":"Abstract. Atmospheric turbulence can significantly affect aircraft missions in terms of aerodynamic loads and vibration. These effects are particularly meaningful for MALE-HALE UAS because of their high aspect ratios and because of their low speed, sometimes comparable with that of the gust itself. Many studies have been conducted to reach the goal of efficient gust alleviation. A viable solution appears the application of morphing technology. However, the design of morphing aircraft is a strongly multidisciplinary effort involving different expertise from structures to aerodynamics and flight control. In this study, a multidisciplinary wing-and-tail morphing strategy is proposed for attaining gust attenuation in UAVs. The strategy is based on the combined use of: i) an automatic detection system that identifies gust direction and entity and ii) an aeroelastic model stemming from the coupling between a high-order structural model that is able to resolve the motion and the strain and stress distributions of wings with complex internal structures and a Vortex Lattice Method (VLM) model that accounts for the aerodynamics of the wing-tail system. The gust alleviation strategy employs the information from the detection system and the aeroelastic model to determine the modifications of the wing and the tail surfaces aimed at contrasting wind effects, reducing induced loads and flight path errors. Numerical results are presented to assess the capability of the framework.","PeriodicalId":87445,"journal":{"name":"Materials Research Society symposia proceedings. Materials Research Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135117943","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}

引用次数: 0

Trajectory reconstruction by means of an event-camera-based visual odometry method and machine learned features 利用基于事件摄像机的视觉里程计方法和机器学习特征进行轨迹重建

Materials Research Society symposia proceedings. Materials Research Society Pub Date : 2023-11-01 DOI: 10.21741/9781644902813-150

S. Chiodini

引用次数: 0

A numerical parametric study on delamination influence on the fatigue behaviour of stiffened composite components 分层对加筋复合材料构件疲劳性能影响的数值参数研究

Materials Research Society symposia proceedings. Materials Research Society Pub Date : 2023-11-01 DOI: 10.21741/9781644902813-82

A. Russo

{"title":"A numerical parametric study on delamination influence on the fatigue behaviour of stiffened composite components","authors":"A. Russo","doi":"10.21741/9781644902813-82","DOIUrl":"https://doi.org/10.21741/9781644902813-82","url":null,"abstract":"Abstract. This paper investigates the fatigue phenomenon in Carbon Fibre Reinforced Plastic (CFRP) composite materials. Fatigue is a major problem in composite materials, due to their complex microstructures and inhomogeneous properties. In composite materials, fatigue is caused by cyclic loading, which leads to the accumulation of damage and eventually failure. This is related to several factors such as material properties, geometry, loading conditions, and environmental conditions. The fatigue life of composite materials is usually much lower than that of metals, and it is often catastrophic and unpredictable. Therefore, it is mandatory to understand behaviour of composite materials subjected to cyclic loading condition and to develop strategies to improve their fatigue performance. To this end, a Paris Law-based module has been implemented in the well-establish SMart-time XB (SMXB) procedure, being able to accurately numerically simulate the delamination growth caused by cyclic loads in complex composite structures. This process, which takes advantages of the mesh and load independency of the SMXB method in the evaluation of the delamination growth, has been implemented in the Ansys Parametric Design Language to create a highly versatile and parametric procedure. A numerical parametric study has been carried out to investigate the behaviour of a pre-existing circular delamination under cyclic loading, to assess the influence of delamination radius and thickness on the delamination growth. The results of this study will provide important insights into how delamination radius and thickness affect the delamination growth and the durability of composite structures. This study will help to inform the design of composite structures for various applications.","PeriodicalId":87445,"journal":{"name":"Materials Research Society symposia proceedings. Materials Research Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135370396","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}

引用次数: 0

Reduced-attitude stabilization for spacecraft boresight pointing using magnetorquers 利用磁力矩器降低航天器轴向指向的姿态稳定

Materials Research Society symposia proceedings. Materials Research Society Pub Date : 2023-11-01 DOI: 10.21741/9781644902813-133

F. Celani

引用次数: 0