查询词典 numerical analysis

The pseudostatic method, Newmark method,numerical simulation and method of comprehensive evaluation combined with post-seismic-hazards survey ,experimental research ,probability analysis ,reliability mathematics, and other methods are included.

包括拟静力法、Newmark法、数值模拟法、模型试验研究方法以及概率分析、可靠性数学分析等其他研究方法的应用及特点。

In addition, the blank holding force that is required to avoid wrinkle and rupture during conical part deep drawing is researched. The necessity of reasonable blank holding force in pressing is expounded. From the view of mechanical analysis, the wrinkle critical condition of side-wall is derived for the first time by the stress state of side-wall, the main deformation region on blank. According to the critical condition of plastic instability for flange, side--wall, corner of punch on blank, The blank holding force in conical part deep drawing is divided into four different regions within its forming figure. The basic principle of reasonable blank holding force during stamping is summarized and provided. The mathematical model of reasonable blank holding force that avoids the wrinkle and rupture is established and verified by the finite element numerical simulation and the grid experiment method. The result shows that it is accurate and reliable.

此外，本文还研究了圆锥形件拉深成形过程中，随着拉深变形过程的进行，毛坯为避免产生起皱、破坏缺陷而对压边力的需求情况，阐明了圆锥形件拉深成形过程中压边力合理变化的必要性；由毛坯主要变形区悬空锥壁部分的受力变形情况，从力学分析的角度，首次推导得出了圆锥形零件悬空锥壁起皱失稳的临界条件；并根据主要变形区法兰、悬空锥壁及凸模圆角部分的塑性失稳临界条件，在其成形范围图中，将圆锥形件成形过程中的压边力划分为四个区域；总结并提出了圆锥形件成形过程中压边力合理变化的基本原则；建立了防止起皱、破坏缺陷产生的压边力合理变化的数学模式，并得到了有限元数值模拟及网格实验法的验证，证实了理论分析结果的正确性和可靠性。

Through theoretical analysis, experimental research and numerical simulation, this thesis studied not only in the micro-pressure drip irrigation system itself, but also the effects of micro-pressure drip irrigation to soil water movement and crop growth.

本文正是围绕目前微压滴灌技术存在的一些问题，对微压滴灌技术的应用问题作了大量的基础性研究。

Taking an old gas field in the Sichuan Basin as an example, this paper selected the wells with complete logging suite, and took the core analysis data as the research understructure. On the basis of accurate lithology identification, the log data numerical processing with high precision was completed by applying optimal log interpretation method. The comprehensive reservoir log interpretation was carried Out and a good result was obtained for the fine log processing and interpretation of reservoirs at 10 wells in this old gas field in the Sichuan Basin by use of such a method.

为此，以四川盆地的某老气田为例，提出了利用测井曲线相对齐全的关键井来构建其他老井测井曲线的新方法，并以岩心分析资料为研究基础，应用最优化测井解释方法，在准确识别岩性的基础上对该气田10口井完成较高精度的测井资料进行了数字处理。

In this thesis, the experimental investigations, theoretical analysis and numerical simulations are carried out to study the detonation characteristics of fuel-air mixtures, explosion suppressions and venting. The relevant parameters of heterogeneous detonations, explosion suppression and venting are obtained experimentally, and the mechanism is revealed.

本文以几种常见液态碳氢燃料云雾为重点，从实验测试、理论分析和数值计算三个方面对燃料云雾爆轰性能、云雾爆炸的抑制与泄放过程进行了系统深入的研究，基本揭示了云雾多相爆轰结构特征和作用机理，获得了有关云雾爆炸抑制及泄放的相关特征参数和变化规律，为控制或减缓工业爆炸灾害的作用程度和范围提供了重要的技术思路和途径。

Several numerical algorithms are applied to model the generalized chebyshev filters and diplexers by domestic and foreign researchers based on full-wave analysis. Designers pay much attention to the mode matching method because of its features of high precision and fast simulation speed in passive component design.

国内外学者运用多种数值算法对其进行全波建模，以便快速精确设计广义切比雪夫滤波器和波导双工器，其中，基于严格场理论的模式匹配法因其精度高、运算速度快等优点而得到国内外研究工作者的高度重视。

Numerical simulation and optimization of process parameters in fineblanking process;2. As fineblanking 's wide application in different industries, such as auto mobile, aircraft and general mechanicals, the finite element analysis of fineblanking is playing a more and more important role in the process from design to manufacture.

随着精冲技术在汽车制造、航空器制造、通用机械等领域越来越广泛的应用，针对精冲过程的有限元数值模拟也越来越成为目前精冲应用领域从设计到制造的重要环节，而网格剖分是精冲成形有限元分析的关键技术之一。

As fineblankings wide application in different industries, such as auto mobile, aircraft and general mechanicals, the finite element analysis of fineblanking is playing a more and more important role in the process from design to manufacture. Mesh generation is also one of the key techniques of fineblanking numerical simulation.

随着精冲技术在汽车制造、航空器制造、通用机械等领域越来越广泛的应用，针对精冲过程的有限元数值模拟也越来越成为目前精冲应用领域从设计到制造的重要环节，而网格剖分是精冲成形有限元分析的关键技术之一。

Then, this dissertation reviews several composites plate theories in detail and detects their different practicabilities, by some numerical examples of static analysis of composites laminated beams. In this way, we can know their different practicabilities.

然后，本文通过几个静力分析的实例深入、详细地比较了工程中常用的几种复合材料叠层板模型，得出了各模型的适用范围。

The author presented an accurate numerical method to inspect the undercut and interference of hypoid gear tooth. The author also designed a set of software for the geometry design, analysis and emulation of hypoid gear drives.

提出了根切和齿顶干涉检验的准确数值方法，完成了HFT法加工准双曲面齿轮的完整几何设计、分析和仿真软件，为提高准双曲面齿轮的质量提供了途径。

By the time of its fall, most of the prisoners were writers who had written against the corruptions of the government.

到它被攻陷的时候，里面多数的犯人是写了反对政府贪污文章的作家。

The most obvious variation to ovum morphological character was that the color was changed from light green to sepiaceous in embryonic development, and all the ovums were almost hatched after 96h.

在胚胎发育过程中卵的形态特征最明显的变化是颜色从淡绿到深褐色，卵在发育96h后卵基本全部孵化。