报告题目一：Numerical and experimental studies of structural joints
报告人：Professor Hamed Haddad Khodaparast（ Swansea University, UK）
报告时间：2023年7月19日 下午14：00
报告地点：A18号楼526报告厅
主办单位：航空航天结构力学及控制全国重点实验室、航空学院、国际合作处、校科协
报告内容摘要一：
Most mechanical structures consist of different substructures that are assembled using mechanical joints. Bolted joints, among the various types of mechanical joints, are widely preferred due to their simplicity in assembling mechanical structures and their ability to efficiently transfer forces and moments between substructures. Bolted joints offer several advantages over other connection types, such as welded joints, including acceptable strength, safety, and durability.
The damping, stiffness, and dynamic response of mechanical assemblies are greatly influenced by the physics of contact interfaces in joints. This aspect is a major contributor to the nonlinearity and uncertainty observed in structural dynamics. Although there has been substantial research on this topic, the constitutive behavior within the contact interface of such joints still presents challenges and requires further investigation.
This presentation showcases our research conducted on the linear and nonlinear modelling and identification of joints. It explores the sources of uncertainty and introduces stochastic linear and nonlinear model updating techniques. Furthermore, the presentation will highlight the recent results of the TRC project (Tribomechadynamics Research Challenge), which aims to assess the cutting-edge strategies employed by the community for making blind predictions regarding the nonlinear dynamics of jointed structures.
报告题目二：Passive and Active aeroelastic gust load alleviation using morphable winglet
报告时间：2023年7月20日 下午14：00
报告地点：A18号楼526报告厅
报告内容摘要二：
Gust loads are among the most critical situations an aircraft can encounter. Mitigating these loads enables the design of a lighter structure, thereby reducing production and fuel consumption costs. Additionally, alleviating the loads also extends the fatigue life of the aircraft's structure. To optimize wing load distribution, various strategies have been proposed by the academic and aircraft manufacturer communities.
Load alleviation strategies can be categorized into two types: active and passive load alleviation. Active load alleviation systems utilize sensor information to adjust the position of control surfaces and reduce the loads. On the other hand, passive load alleviation techniques rely on the structural deformation capability to limit loads during specific perturbations, such as wind gusts.
This presentation showcases ongoing research conducted at Swansea University, highlighting numerical and experimental studies of a wing with morphable winglets. These winglets have demonstrated significant potential for load alleviation. The presentation will also include numerical studies on the implementation of active control systems within this concept. Furthermore, the presentation will propose potential future work to be pursued as a continuation of the current project.
报告人简介：
Prof Hamed Haddad Khodaparast is a Chair Professor in Aerospace Engineering, in the Faculty of Science and Engineering at Swansea University. Prof Haddad has extensive research experience in structural dynamics and methods development for stochastic model identification in aeroelasticity. He also collaborated with the CFD group at Liverpool to examine the problem of uncertainty propagating through large CFD-based models. In 2015, he was awarded the Royal Academy of Engineering Industrial Secondment (RAEng IS) and Sêr Cymru National Research Network (NRN) awards and worked with Airbus in the area of gust load predictions in the presence of nonlinearity and uncertainty. He is currently working on problem of structural joint modelling and identification in an EPSRC Programme Digital twins for improved dynamic design. He is also an active collaborator on Semi Aeroelastic Hing (Albatross-one) project in Airbus, working on the problem of gust load alleviation using movable winglet.