安排表

Schedule

轻质及超轻材料在航天航空中的应用

Application of Lightweight and Ultralight Materials and Structures in Aerospace Engineering

主讲：刘子顺

Lecturer: Liu Zishun

Soft materials such as hydrogels and shape memory polymer (SMPs) are good candidates for soft machines, which have the elegance of nature’s designs and have great potential application in aerospace engineering. In the emerging field of soft machines, the large deformation of soft materials enables their vital functions. Therefore, large deformation study of soft materials, such as hydrogels and SMPs, is a new and very current research topic. Hydrogels are a network of polymers that have imbibed a large quantity of a solvent and swelled. The gel can deform in response to stimuli other than mechanical forces. Possessing superior capabilities to imbibe solvents and swelling to a large extent, hydrogels are an interesting class of materials which present tremendous potential as the next generation material of choice. SMPs, a kind of smart material, can keep a temporary shape after pre-deformation at a higher temperature and subsequent cooling to a lower temperature. When they are reheated, their original shape can be recovered. Such special characteristics of SMPs make them widely used in soft machine devices. On the other hand, from both scientific and industrial perspectives, silica aerogel, a nano-porous ultra-light material, has played an increasing role in wide areas due to its excellent thermal, optical, acoustical and mechanical properties. The high porosity of silica aerogels leads to a very low thermal conductivity compared to non-porous monolithic amorphous silica, mainly because the large amount of pores effectively reduce the transmission of the local excitation. 

In this presentation, I will review some of the recent works aligned with the direction of providing a better understanding of computational soft materials and ultra-light materials (gels, SMPs and Aerogel). The neutral and environmentally sensitive (such as temperature, pH-value and light) hydrogels are investigated. For the SMPs study, we developed a new viscoelastic model based on phase transition, which can be used for different SMP materials and can be used for large strain large deformation analyses. To validate the model, simulated and predicted results are compared with experimental results. For ultra-light material called silica aerogel, which has the superior thermal, optical, acoustical, and mechanical properties of a nano-porous and ultra-light material, we propose a new analytical-numerical model of silica aerogel to predict its Young’s modulus. The molecular dynamics (MD) simulation method is adopted to model and simulate the backbone of silica aerogels with different densities in an improved negative pressure rupturing method and their mechanical properties are investigated. In the prediction, we proposed a two-level nano-porous structure model according to our simulation outcome and the widely accepted fractal structure of silica aerogel. The Young’s modulus of silica aerogel, which is shown in a power-law relation with the density of samples, is derived by the two-level hierarchical model and uniaxial tension tests. Finally, as many issues related to the mechanics of hydrogel, SMPs and aerogel deformation behaviors remain open, I will list some outlines for plausible future directions in the research of computational mechanics of soft materials and ultra-light material.

未来天空霸主-无人飞行器

Ruler of the Future Sky -Unmanned Air Vehicle

主讲：刘振

Lecturer: Liu Zhen

本课程针对无人飞行器，目的在于通过本课程学习，使得学生了解无人飞行器的基本知识、在战争和民事中的应用以及未来无人飞行器的发展趋势。课程内容包括飞行器基本概念的介绍、无人飞行器系统的组成和功能、无人飞行器飞行的基本原理、无人飞行器的种类、无人飞行器的发展历史、无人飞行器的应用、无人飞行器的优缺点、无人飞行器未来发展的趋势等。

This course mainly focuses on Unmanned Aerial Vehicles (UAVs). The main aim of this course is to help students to learn about the basic knowledge of UAVs, the application of UAVs in the war and civil affairs, and the development of UAVs. The contents include the introduction of UAV, the components and functions of UAV, the category of UAVs, the history of UAVs, the application of UAVs, the advantages and disadvantages of UAVs and the future perspective of UAVs.

中国对外交流简史

China’s Opening: A Historical Review

主讲：冯广宜

Lecturer: Feng Guangyi

本课程通过简要介绍中国文化形成的过程和奠基中国文化的主要渊源，使学生能够系统地把握中国文化的主要核心内容，以及中国文化中的影响。同时，本课程还将对中国传统文化中对现代文明智慧的重要贡献做以简要的分析。

This course aims to give the students a brief and clear understanding about Chinese culture by a brief introduction to the history of major Chinese cultural origins. This course also contains a brief analysis of Chinese culture’s influence to neighboring areas and a case-analysis of the wisdom that is contained in traditional Chinese culture.

航空宇航推进系统

Elements of Aerospace Propulsion System

主讲：雷蒋

Lecturer: Lei Jiang

以火箭发动机为动力的航天器和运载器被广泛用于现代各项军事和民用航天活动中，本报告主要针对航天器和运载器的各类火箭发动机，及其工作原理和基本结构进行介绍。本报告的内容分为四部分：1.飞行器对动力系统的要求，对包括航空器、航天器、运载器在内的飞行器及其动力系统进行了简要介绍，主要集中在航天器和运载器的特点及其需求；2.典型航天推进系统，对获得成功应用的各类火箭发动机进行介绍；3.火箭发动机基本原理，主要介绍火箭发动机的基本分类，以及各类发动机的工作原理和特点；4.火箭发动机的基本结构，对液体和固体火箭发动机的基本结构进行了介绍。

Spacecrafts and space vehicles are widely applied in modern military and civilian space activities. In this lecture, rocket engines frequently used in spacecrafts and space vehicles are introduced, focusing on their operational principles and basic structures. The lecture includes 4 parts: 1.The demand of flying vehicles on propulsion system, introducing aircraft, spacecraft, and space vehicles and their propulsion system; 2.Typical aerospace propulsion systems, introducing several successfully-applied rocket engines; 3. Fundamental principles of rocket engines, introducing their classification, operational principles and characteristics; 4. Basic structures of rocket engines, introducing the structures of both liquid and solid rocket engines.

智能软材料与软机器

Soft Active Materials and Soft Machines

主讲：卢同庆

Lecturer:Lu Tongqing

软物质的概念由诺贝尔奖获得者德热纳提出，是指在很小的外界作用下能够产生很大状态变化的物质，例如柔软的橡胶、水凝胶、液晶等。活性软物质指的是在力、热、光、电等作用下发生明显响应的智能柔性材料。本报告主要介绍目前国际上研究较多的几类典型活性软物质以及基于活性软物质制作的各类软机器，突出力学原理在材料机理分析和机器结构设计方面的应用，最后介绍3D打印软机器领域的最新进展。

Soft materials refer to the materials that respond significantly subject to relatively small excitation. The concept was proposed by the Nobel Prize winner de Gennes in 1991. Soft active materials usually refer to the soft materials stimulated by small force, temperature, PH, electricity. Representative materials are dielectric elastomers, hydrogels, liquid crystals, etc. This talk mainly introduces several soft active materials world-wide frequently discussed in recent years and soft machines made based on these materials. We focus on the applications of mechanics in understanding the new mechanisms and structural design for the soft active materials. We also talk about the recent development of 3D printing technique on soft machines.

燃气轮机高温材料力学行为

High-Temperature Mechanical Behavior of Gas turbine

主讲：张伟旭

Lecturer: Zhang Weixu

主要讲述燃气轮机所涉及的材料力学行为，重点讲述高温透平叶片热障涂层的失效行为。讲座从基本力学概念出发，讲述在燃气轮机具体结构上的力学问题。

In this course, we will discuss the mechanical behavior of materials in gas turbine. We will mainly talk about the failure behavior of thermal barrier coatings of turbine blades. The basic concepts of solid mechanics will be introduced firstly, and then their application in gas turbine will be disscussed.

智能材料力学简介：理论及应用

A Brief Introduction to the Mechanics of Smart Materials: Theories and Applications

主讲：邓谦

Lecturer:Deng Qian

在过去的几十年中，智能材料作为航天、航空、机械、建筑、生物、医疗及电子等行业中应用极为广泛的材料之一受到了大量的关注。由于其特殊的多物理场耦合特性，智能材料在现代工业的发展中起着不可替代的作用。而且，随着智能材料研究领域的快速发展，更多的关于智能材料的应用正不断地被发现。对于智能材料设计、制备及应用等方面的研究，已经不仅仅局限于材料科学的领域，而是已经成为一个横跨物理、化学、力学、电子、生物、医学等众多学科的研究方向。本讲座将对智能材料领域做一个简单的介绍，包括其机理、制备和应用等方面的一些情况。由于力学这门学科是连接物理理论与工业应用之间的一个桥梁，因此对智能材料领域的发展有着重要的作用。本讲座也将聚焦于智能材料力学（智能材料中的力学相关问题），并将展示为什么力学是智能材料研究及应用领域的一门重要学科。

The research field of smart materials, a kind of most used materials in aerospace, mechanical and civil engineering, biology, medicine and electronics, has attracted a fair amount of attentions in the past few decades. Due to its property of multiphysics coupling, smart materials are becoming more and more indispensible for the model industry. With the fast development of smart materials, there are more applications of it being discovered. The research to smart materials including its design, fabrication and application is not limited to the field of material science, but also covers the fields of physics, chemistry, mechanics, electronics, biology and medicine. This lecture will give a big picture of the field of smart materials, including the brief mechanism behind them, how we fabricate and apply them in multiple industries. Since mechanics is a subject that links the theories of physics to their application in industry, it plays an important role in the field smart materials. So, in this lecture, we will also focus on the mechanics of smart materials and try to show why it is important for the field of smart materials.

液滴冲击动力学

Drop Impact Dynamics

Lecturer: Marie-Jean  THORAVAL

由于表面张力的作用，液滴在小尺度上构成液体的基本形式。因此，了解它们的动力学在自然界和工业中都有着广泛的含义，例如喷墨打印、燃烧、气候模拟和冷却技术等。当前的挑战之一是如何能够观测到它们在小尺度上的超快速运动。随着高速成像技术的进展，以每秒1000万帧的帧速探索一个新的世界成为可能。同时，最新的数值模拟也成功地揭示了动力学的一些复杂性，包括改进的数值模拟和更大的并行模拟。这次，我们将回顾一些最近发现的液滴撞击液池或固体表面的动力学，包括液滴飞溅和空气滞留。

Drops constitute the fundamental form of liquids at small scales, due to the action of surface tension. Therefore, understanding their dynamics has a wide range of implication, in nature and the industry, including inkjet printing, combustion, climate modelling and cooling technologies. One of the challenges is to understand their extremely fast motion at small scale. With the recent progresses in high-speed imaging techniques, it has become possible to explore a new world at frame rates up to 10 million frames per second. At the same time, numerical simulations have revealed some of the complexities of the dynamics, with improved numerical modelling and larger parallel simulations. We will review some of the recent discoveries in the dynamics of drop impacts on a pool or a solid surface, including splashing and air entrapment.