分类: 工程与技术科学 >> 工程与技术科学其他学科 提交时间: 2024-06-28 合作期刊: 《中国科学院院刊》
摘要: 高超声速技术是未来航空航天领域的制高点,具有重要的战略性和前瞻性意义。文章采用文献计量/综 述、国内外官方机构/权威网站调研等方法对全球高超声速技术发展态势进行分析。研究发现,针对高超声速 技术的研究主要集中在军事领域,其中动力推进技术、制导与控制技术、新型材料和热防护技术等是该领域 的研究重点方向。通过梳理各国研发态势发现,未来涉及高超声速武器研发的相关核心技术仍是研究的重 点,同时各国正加快优先布局高超声速防御系统,加强与合作国在技术研发、联合防空和导弹防御等方面的 合作,以提升地区防御力和威慑力。
分类: 工程与技术科学 >> 工程与技术科学其他学科 提交时间: 2023-11-10 合作期刊: 《应用力学学报》
摘要: 纳米材料可有效改善水泥基的力学性能和耐久性,为探索纳米SiO2、Fe2O3对混凝土材料的增强机理,研制力学性能更优的混凝土,制备了0%~2.0%掺量范围内单掺纳米SiO2、纳米Fe2O3、复掺纳米SiO2和纳米Fe2O3的混凝土试件,对养护龄期为7 d及28 d的混凝土力学性能开展试验研究,结果表明:纳米材料总掺量为1.5%且纳米SiO2掺量为1.0%、纳米Fe2O3掺量为0.5%时改性混凝土的力学性能达到最优,该复掺比例改性混凝土比普通混凝土及同掺量的单掺改性混凝土具有更优异的力学性能。采用冷场发射扫描电镜对纳米改性混凝土内部微观形貌进行观察,并借助能量分散谱仪分析纳米改性混凝土的化学成分,结果表明掺入的纳米SiO2及纳米Fe2O3会发生晶核作用并与Ca(OH)2晶粒发生化学反应,在混凝土内部分别生成珊瑚状、球状水化产物C-S-H凝胶及C-F-H凝胶,晶核的高活性吸附凝胶在其表面聚集,减少Ca(OH)2晶粒的数量,并互补填充形成密实的水化产物,使混凝土结构更加紧实致密。研究成果可为高性能混凝土的研发提供参考。
分类: 工程与技术科学 >> 工程与技术科学其他学科 提交时间: 2023-11-10 合作期刊: 《应用力学学报》
摘要: 基于层合板壳理论,考虑反对称铺设层合板的拉弯耦合效应和后屈曲过程中的非线性几何变形,推导了由应力函数和挠度表示的复合材料层合板的后屈曲控制方程。引入无量纲参数对控制方程和边界条件进行无量纲化,以消除材料参数及几何尺寸对分析结果的影响。采用摄动法将无量纲的非线性控制方程及边界条件展开成一系列非齐次线性摄动方程组,分析各阶摄动方程的通解与特解的构造,并逐次求解,建立了反对称铺设复合材料层合板受单向均布压力作用的临界屈曲荷载及后屈曲平衡路径的理论解。进而运用ABAQUS软件对复合材料层合板在面内压缩载荷作用下的屈曲和后屈曲进行有限元分析,结果表明理论解与ABAQUS结果十分接近,验证了理论解的正确性。在此基础上进一步讨论了铺设角度、铺设层数和拉弯耦合效应等对层合板后屈曲性能的影响。研究发现层合板的屈曲载荷受铺设角度与层数的影响较为显著,而拉弯耦合效应使板的屈后强度大大降低。
分类: 工程与技术科学 >> 工程与技术科学其他学科 提交时间: 2023-11-10 合作期刊: 《应用力学学报》
摘要: 采用大涡模拟(LES)和声比拟(AA)结合的方法,在低马赫数条件下,对SD7003多孔翼型自噪声声场进行计算,研究多孔材料在不同来流迎角下对翼型自噪声远场声压的影响规律,并阐述噪声的影响机理。结果表明:LES与AA相结合的方法能够较为准确地计算多孔翼型的边界层特征以及远场声压,且数值模拟结果与实验结果非常吻合。来流迎角为0°时,多孔翼型整体声压级随着渗透率的减小先减小后增大,渗透率为5×10-11m2时多孔材料的降噪效果最佳。多孔翼型整体声压级随着迎角的增大而增大,但多孔材料的降噪效果随着迎角的增大而减小。多孔材料的存在能够有效地削弱翼型表面的大尺度相干结构,使得翼型表面的RMS压强脉动峰值减小,从而抑制翼型远场噪声。
分类: 工程与技术科学 >> 工程与技术科学其他学科 提交时间: 2023-11-10 合作期刊: 《应用力学学报》
摘要: 民用飞机复材壁板与金属壁板的连接是机身结构设计的重要研究内容,如何将复材帽形长桁和金属Z形/2形长桁连接是研究的重点和难点。本研究提出了一种新型混合连接结构,同时考虑了预埋缺陷和BVID损伤对试验件的影响。通过试验、数值仿真等分析方法研究了混合连接结构的静强度特性,详细分析了试验件的受力情况、失效模式以及破坏位置,很好的解决了复材帽形长桁和金属Z形/2形长桁连接载荷传递问题。研究结果表明:该混合连接结构满足民用飞机结构与强度的设计要求,预埋缺陷和BVID损伤对试验件的破坏载荷和破坏模式无影响。以上研究结果为型号飞机的研制和发展提供重要的指导作用。
分类: 工程与技术科学 >> 工程与技术科学其他学科 提交时间: 2023-11-10 合作期刊: 《应用力学学报》
摘要: 隔振平台连接直升机机体与光电跟瞄吊舱,对机载跟瞄系统的跟瞄精度至关重要。采用多个笼形隔振器并联,设计了一种直升机机载跟瞄系统的被动隔振平台。由欧拉变换描述隔振平台的空间姿态,基于Lagrange方法建立隔振平台的动力学模型,获得了不同激振频率下隔振平台的振动传递率。利用ANSYS动力学仿真验证了隔振平台理论模型的正确性,校核了大过载情况下隔振平台的冗余保护能力。通过实际飞行测试,检验了隔振平台的隔振效果。
分类: 工程与技术科学 >> 工程与技术科学其他学科 提交时间: 2023-09-05
摘要: This paper presents an overview of the theories and computer implementation aspects of phase field models (PFM) of fracture. The advantage of PFM over discontinuous approaches to fracture is that PFM can elegantly simulate complicated fracture processes including fracture initiation, propagation, coalescence, and branching by using only a scalar field, the phase field. In addition, fracture is a natural outcome of the simulation and obtained through the solution of an additional differential equation related to the phase field. No extra fracture criteria are needed and an explicit representation of a crack surface as well as complex track crack procedures are avoided in PFM for fracture, which in turn dramatically facilitates the implementation. The PFM is thermodynamically consistent and can be easily extended to multi-physics problem by 'changing' the energy functional accordingly. Besides an overview of different PFMs, we also present comparative numerical benchmark examples to show the capability of PFMs.
分类: 工程与技术科学 >> 工程与技术科学其他学科 提交时间: 2023-01-10 合作期刊: 《Art & Design Research》
摘要: Cultural confidence is one of the important factors to promote the inheritance and development of excellent national culture. Maonan traditional craft contains excellent national culture, cultural customs and so on, which is a part of carrying forward China's traditional culture confidence. From the perspective of cultural confidence, this paper analyzes the characteristics and advantages of the current Maonan traditional crafts and puts forward suggestions to promote the innovative development of Maonan traditional crafts, which can better promote the inheritance and development of Maonan traditional crafts.
分类: 工程与技术科学 >> 工程与技术科学其他学科 提交时间: 2023-01-10 合作期刊: 《Art & Design Research》
摘要: Driven by the rapid development of omnimedia, the Internet, movies, television, etc. have gradually blend in peoples daily lives, and cartoons are also deeply loved by children. Colleges and universities are an important base for cultivating animation talents, in the process of carrying out animation teaching, due to the short setting up time and other reasons, it is necessary to continuously improve the teaching system of animation professional courses, and comprehensively analyze the current problems in teaching, so as to provide more help for students learning and avoid being affected by a variety of factors that lead to the inability to effectively improve teaching efficiency. In the language environment of omnimedia, it is necessary to actively improve the efficiency of animation teaching, optimize the teaching system according to the actual situation, and implement the teaching of all links to maximize the role of curriculum system reform. Based on this, this paper mainly analyzes the importance and necessity of animation curriculum reform in the language environment of omnimedia.
分类: 工程与技术科学 >> 工程与技术科学其他学科 提交时间: 2023-01-10 合作期刊: 《Art & Design Research》
摘要: Traditional dwellings with high regional artistic expression, is an important carrier of China's national culture, regional characteristics, ethnic customs. The wooden architecture of the Dong Nationality 's residential houses originated from the southern stilt-style architecture. Its unique construction technology is a treasure of national culture. Studying the aesthetic implication of Dong residential buildings will help people understand Dong culture more deeply. From the perspective of artistic aesthetics, this paper makes a detailed study of the dwellings of Dong people from five aspects: the environmental beauty of man-nature harmony, the beauty of building materials, the beauty of structure, the beauty of architectural skills and the beauty of culture. Hope to help readers understand the spiritual core of Dong culture, to better protect the Dong residential buildings wooden.
分类: 工程与技术科学 >> 工程与技术科学其他学科 提交时间: 2023-01-10 合作期刊: 《Art & Design Research》
摘要: In the past 30 years, the development of brownland into green land has become an important way for the sustainable development and management of urban land. Fully understanding the various application scenarios and values of this approach is helpful to explore its efforts in providing ecosystem services and meet the development needs of different types of cities. This paper reviews the practice and literature of brownfield redevelopment from the perspective of landscape architecture, and obtains the process of its theoretical development and its understanding deepening. Through sorting out the relevant discipline literature, the seven main green space types and their potential broad benefits are summarized, and we realize that the brownfield itself has many values that cannot be ignored in the development process. On this basis, it proposes that there is a new cognition of the relationship between brownfield and green space.
分类: 工程与技术科学 >> 工程与技术科学其他学科 提交时间: 2023-01-10 合作期刊: 《Art & Design Research》
摘要: In the post-epidemic era, great turbulence has taken place in the field of human life, especially the travel rate of people has been greatly reduced, but the requirements for urban public space required for travel are constantly improving.As the main social life space carrier of street space requires carrying more functions to meet the requirements of the outbreak era.Through literature search and social investigation, the optimization design strategy is proposed for the problems of weak slow traffic use right, monotonous space function, lack of commercial management, and random public facilities of urban streets. Then, through the legend analysis, the optimization effect of street space in four levels of environmental comfort, functional diversification, management order and facilities refine#2;ment can be achieved to improve the residents' street life experience and return to the public space essence of people-oriented street.
分类: 工程与技术科学 >> 工程与技术科学其他学科 提交时间: 2023-01-03 合作期刊: 《2022年第三届艺术设计、传播与工程科学研讨会》
摘要: With the change in media technology, the pattern of time and space is constantly broken, and the development of media tends to be more and more spatial and temporal freedom. On the social level, the social range of the general public is expanding, and the social distance is shrinking based on the expansion. However, people's senses have also changed, from balance to breaking balance to the constant pursuit of balance. In this paper, we will discuss the body logic of social networks and the future development trend of social networks from the perspective of senses based on the change of senses in the media.
分类: 工程与技术科学 >> 工程与技术科学其他学科 提交时间: 2023-01-03 合作期刊: 《2022年第三届艺术设计、传播与工程科学研讨会》
摘要: In order to explore the cultural connotation and artistic characteristics of Tang Dynasty ceramic decorative patterns, integrate traditional ethnic decorative patterns with modern design, and promote the inheritance and development of excellent traditional culture, this paper first understands the decorative patterns of Tang Dynasty ceramics by reading books and consulting materials, collects representative ceramic utensils of the Tang Dynasty, and extracts the decorative patterns on these cultural relics, analyzes the inner meaning of the patterns through semiotics, and understands their aesthetic characteristics. The use of shape grammar, complexity into simplicity, decomposition and reconstruction of the extracted pattern for innovative design, into the modern aesthetic concept, according to its semantic and visual characteristics into the modern product design and decoration. The Tang Dynasty is a representative period of China's culture, and the combination of Tang Dynasty patterns and modern design is conducive to inheriting the excellent culture of the Tang Dynasty, while increasing the cultural value of modern design and enhancing product competitiveness.
分类: 工程与技术科学 >> 工程与技术科学其他学科 提交时间: 2023-01-03 合作期刊: 《2022年第三届艺术设计、传播与工程科学研讨会》
摘要: The formal aesthetics of calligraphy is an important content in the process of modern Chinese aesthetics. In the first half of the 20th century, Western aesthetics was more active in the Chinese aesthetics and art circles. In the process of meeting with Chinese traditional aesthetics, it had a profound impact on Chinese scholars and promoted their thinking on traditional Chinese aesthetics. The research perspective of most scholars has shifted from the direction of Western aesthetics to Chinese ontology aesthetics. Most of them studied abroad in their early years, focusing on Western aesthetics. After returning to China, they made active contributions to the modernization of traditional Chinese aesthetics. These traditional literati scholars all have a cultural background of middle school and western learning, so when they discuss the issues involved in calligraphy aesthetics, they unconsciously explain both Chinese and Western aesthetic viewpoints. Among them, Deng Yizhe's aesthetic research on painting and calligraphy is the most detailed.
分类: 工程与技术科学 >> 工程与技术科学其他学科 提交时间: 2023-01-03 合作期刊: 《2022年第三届艺术设计、传播与工程科学研讨会》
摘要: Aiming at the current situation that many elderly people with sudden illnesses have lost their lives due to missing the golden time of first aid in the natural landscape tourism environment, in order to solve the waste of medical resources in the rescue station in the natural landscape tourism environment, the relief terrain is complex, Help is not timely and other pain points. Taking the Leshan Giant Buddha Scenic Spot as an example, through the methods of user portraits and questionnaires, we can deeply explore its pain points and internal needs, and provide the basis for the current situation of the elderly in sudden diseases during tourism. Comprehensive analysis is made from the perspectives of the elderly, rescuers, scenic spots, and first-aid equipment, and a public emergency strategy based on the natural landscape tourism environment is constructed. The medical resources in the scenic spot increase the rescue opportunities for patients, and strive for rescue time for the elderly who have sudden illnesses. Improve the first aid knowledge reserve and self-rescue ability of the general population, enhance the sense of social responsibility and security of the whole people, and provide more reference for the improvement of the Internet plus medical system.
分类: 工程与技术科学 >> 工程与技术科学其他学科 提交时间: 2023-01-03 合作期刊: 《2022年第三届艺术设计、传播与工程科学研讨会》
摘要: In the previous studies on yi nationality lacquer, scholars mostly studied the shape, pattern, function and industry of lacquer, but few studied it from the cultural perspective. With the development of The Times and the integration of different cultures, lacquerware is no longer a daily item for every Yi family, and its cultural connotation is paid little attention to. Based on the method of literature research and field research, the research will study the cultural origin, cultural structure, characteristics and functions of liangshan Yi lacquer ware in Sichuan and its cultural connotation, and put forward suggestions for the development of Liangshan Yi lacquer ware.
分类: 工程与技术科学 >> 工程与技术科学其他学科 提交时间: 2023-01-03 合作期刊: 《2022年第三届艺术设计、传播与工程科学研讨会》
摘要: In response to the short life cycle, serious waste of resources, and cumbersome steps in the product use process in the stationery market, from the perspective of sustainability and ergonomics, comprehensively apply the KANO model and TRIZ theory to study the improved design of stationery sets. Taking the target user as the interview object, firstly conduct user interviews and discover the pain points of the existing stationery sets on the market; propose improved demand points for the concentrated pain points, and conduct KANO questionnaire distribution and analysis to obtain the key requirements for improving user satisfaction; combine the key requirements , Using the 39-factor Altshuller contradiction matrix table provided by TRIZ theory and 40 invention principles, through comparison and screening, the final optimized design plan is obtained, which provides solutions for the improved design of stationery sets, so as to improve the product and the user, The relationship with the use environment, to achieve the purpose of product sustainability.
分类: 工程与技术科学 >> 工程与技术科学其他学科 提交时间: 2023-01-03 合作期刊: 《2022年第三届艺术设计、传播与工程科学研讨会》
摘要: To optimize the cultural experience of users in using digital creative products of intangible cultural heritage and enhance the promotion of intangible cultural heritage projects, this paper proposes a corresponding product design method based on the Flow theory. Taking the factors of the Flow theory as the starting point, this paper combines the user experience process corresponding to the use scenario of NRM digital creative products, from which the the Flow journey diagram of general users in the NRM experience is summarized and optimized, and the specific design solution process is constructed in this way. This paper introduces the Flow theory to NRM. And this paper introduces the Flow theory into the design and application of digital creative products of intangible cultural heritage, to improve the immersion experience of existing digital creative products of intangible cultural heritage, enhance the bond between users and intangible cultural heritage, and also provide theoretical and practical references for the preservation and innovative transformation of intangible cultural heritage.
分类: 工程与技术科学 >> 工程与技术科学其他学科 提交时间: 2023-01-03 合作期刊: 《2022年第三届艺术设计、传播与工程科学研讨会》
摘要: The advent of extended reality (XR) in red tourism is revamping tourist experience. Compare to tour guide service in other-directed travel, the influence of XR technology in self-directed travel on perceived value and behavior intention needs further research. This paper constructs a conceptual model based on the relationship between tourist experience, perceived value and behavior intention. Basic data in the memorial hall in a memorial park dedicated to the Battle of the Xiangjiang River during the Long March were obtained through questionnaire survey. After collecting the data, this paper uses structural equation model to verify the hypotheses. As a result of this analysis, the present study offers the following conclusions: First, self-directed tourist experience has positive influence on knowledge value and experience value. Second,other-directed tourist experience has positive influence on knowledge value and sentimental value. Third, experience value, self-directed tourist experience and other-directed tourist experience has positive influence on behavior intention.