共查询到20条相似文献,搜索用时 78 毫秒
1.
计算机代数系统在力学教学中应用非常普遍. 摘录Maple在理论力学、材料力学、弹性
力学和有限元中的应用, 以简便地完成模型求解和结果处理. 并扩展到备课、讲课和
课后作业演练等环节, 提供最大限度地计算支持.
将其引入力学教学, 引导和培养学生利用数学工具的习惯和能力, 强化算
法设计和程序的通用性和灵活性, 为处理复杂问题提供帮助. 相似文献
2.
互动反馈是影响教学效能的重要因素.力学课程是工程领域重要的专业基础课,概念和计算方法较多,学生感觉难度很大.传统教学模式师生互动不足,反馈信息不全面,学生注意力易分散,教学相对低效.本研究尝试在力学课程中构建互动反馈教学模式.首先为全面精细反馈提供技术支持,创建应答技术系统——师生互动平台;然后通过实践探寻多元互动反馈模式在力学课程中的实施策略,并给出具体的案例展示.实践表明,多元互动反馈模式能有效提高教学效能. 相似文献
3.
4.
5.
为了提高非线性有限元的教学和科研水平,经中国力学学会和北京市力学学会批准,清华大学工程力学系于2004年6月17日~19日在北京举办了全国非线性有限元讲习班,聘请了美国西北大学Ted Belytschko教授讲学3天,题目为非线性有限元与计算力学。 相似文献
6.
有限元仿真课程已成为力学等专业新工科人才培养中的重要环节。本文针对该课程的特点,提出了实例驱动型启发式的教学方法。通过对带孔方板受拉问题的教学实例的阐述,详细介绍了实例驱动型教学方法的组成部分和实施要点,讨论了启发式理念在该实例教学中的体现。通过同济大学的教学实践,表明所提方法能显著提高教学效果。 相似文献
7.
8.
9.
10.
力学作为工科基础性课程,在专业课程体系中占有十分重要的位置,但力学课程的教学效果普遍较差,诸多学者提出了各种方法以促进力学课程的教学,由于教学条件、学生层次等原因使其具有一定的局限性.本文在此研究的基础上,以大学生结构设计大赛为导向,详细剖析了力学课程在赛题中的实际应用,对应课程内容初步建立了力学课程三阶段教学方法,通... 相似文献
11.
V. S. Nagornyi 《Journal of Applied Mechanics and Technical Physics》2000,41(2):225-230
The physical and mathematical principles of the method of electrogas-and electrohydrodynamic conversion of electrical signals
to pneumatic (hydraulic) signals and vice versa for control of gas and liquid jets and flows in electropneumohydraulic systems
are considered.
St. Petersburg State Technical University, St. Petersburg 195251. Translated from Prikladnaya Mekhanika i Tekhnicheskaya Fizika,
Vol. 41, No. 2, pp. 25–31, March–April, 2000. 相似文献
12.
Richard E. Whaley 《Experimental Mechanics》1962,2(11):329-334
This paper describes a method of presentation of fatigue data on three commonly used aircraft materials, 2024-T3 and 7075-T6 aluminum alloys and normalized SAE 4130 steel, such that variations in fatigue strength with stress-concentration factor can be shown. Comparisons of the fatigue strengths of 2024-T3 and 7075-T6 aluminum are made for the most useful range of stress-concentration factors. Static-strength results of notched and unnotched specimens of the three materials are presented to show how the strength varies with some parameters of the stress concentration. Comparison of the data with one theory for the strength of cracked specimens was made. 相似文献
13.
STICTION AND ANTI—STICTION IN MEMS AND NEMS 总被引:6,自引:1,他引:6
赵亚溥 《Acta Mechanica Sinica》2003,19(1):1-10
Stiction in microelectromechanical systems (MEMS) has been a major failure mode ever since the advent of surface micromachining
in the 80s of the last century due to large surfacearea-to-volume ratio. Even now when solutions to this problem are emerging,
such as self-assembled monolayer (SAM) and other measures, stiction remains one of the most catastrophic failure modes in
MEMS. A review is presented in this paper on stiction and anti-stiction in MEMS and nanoelectromechanical systems (NEMS).
First, some new experimental observations of stiction in radio frequency (RF) MEMS switch and micromachined accelerometers
are presented. Second, some criteria for stiction of microstructures in MEMS and NEMS due to surface forces (such as capillary,
electrostatic, van der Waals, Casimir forces, etc.) are reviewed. The influence of surface roughness and environmental conditions
(relative humidity and temperature) on stiction are also discussed. As hydrophobic films, the self-assembled monolayers (SAMs)
turn out able to prevent release-related stiction effectively. The anti-stiction of SAMs in MEMS is reviewed in the last part.
The project supported by the Distinguished Young Scholar Fund of NSFC (10225209), key project from the Chinese Academy of
Sciences (KJCX2-SW-L2) and National “973” Project (G1999033103) 相似文献
14.
15.
16.
本文针对现代换热设备设计、两相流动与传热研究的需要,介绍了可供科研使用的水和水蒸汽物性计算方法,完善了计算程序。根据超临界锅炉设计中的超临界水的物性计算,两相流研究和换热设备动态特性研究中对物性导数计算的需要,提供了两个算例,并进行了定性分析。 相似文献
17.
Amit Acharya 《Journal of Elasticity》2011,104(1-2):23-44
A methodology is devised to utilize the statistical mechanical entropy of an isolated, constrained atomistic system to define constitutive response functions for the dissipative driving-force and energetic fields in continuum thermomechanics. A thermodynamic model of dislocation mechanics is discussed as an example. Primary outcomes are constitutive relations for the back-stress tensor and the Cauchy stress tensor in terms of the elastic distortion, mass density, polar dislocation density, and the scalar statistical density. 相似文献
18.
Jean-François Pinton Guillaume Brillant 《Theoretical and Computational Fluid Dynamics》2005,18(6):413-433
We review several aspects of the propagation of sound in vortical flows. We restrict ourselves to isothermal, humidity-free flows at low Mach number M. Since vorticity plays a major role in vortex-flow interactions we focus on vortical flows. We consider two main canonical situations. The first concerns the transmission of sound. We analyze the evolution of acoustic wavefronts as they propagate across a single vortex. The second situation addresses the scattering of sound waves by nonstationary vortices. We study the evolution of the acoustic pressure emitted in the far field, at an angle with the initial direction of propagation. In this geometry one performs direct spectroscopy of the flow vorticity field. In each case, we review theoretical results and compare with experimental measurements and numerical simulations when available. We also briefly report how the following new acoustic techniques have recently been used to study complex or turbulent flows: time-resolved acoustic spectroscopy, speckle interferometry and Lagrangian particle tracking. PACS 43.25, 43.28, 47.32, 67.40 相似文献
19.
20.
Francisco J. Montáns Francisco Chinesta Rafael Gómez-Bombarelli J. Nathan Kutz 《Comptes Rendus Mecanique》2019,347(11):845-855
In the past, data in which science and engineering is based, was scarce and frequently obtained by experiments proposed to verify a given hypothesis. Each experiment was able to yield only very limited data. Today, data is abundant and abundantly collected in each single experiment at a very small cost. Data-driven modeling and scientific discovery is a change of paradigm on how many problems, both in science and engineering, are addressed. Some scientific fields have been using artificial intelligence for some time due to the inherent difficulty in obtaining laws and equations to describe some phenomena. However, today data-driven approaches are also flooding fields like mechanics and materials science, where the traditional approach seemed to be highly satisfactory. In this paper we review the application of data-driven modeling and model learning procedures to different fields in science and engineering. 相似文献