摘要：车架作为摩托车的复杂总成,在增强驾驶体验、确保行驶安全等方面发挥着关键性作用。为提升装配精度,管控设计难度,推动车架的轻量化,文章以wave方法为框架,通过设计思路的调整与设计方法的创新,实现摩托车车架设计的动态化与数字化,极大提高车架设计效率,压缩设计周期,增强设计效能。因此,本文针对基于wave方法的摩托车车架设计进行研究。

摘要：In this paper, we theoretically and numerically study a combined monopole–dipole measurement mode to show its capability to overcome the issues encountered in conventional single-well imaging, i.e., the low signal-to-noise ratio of the reflections and azimuth ambiguity. First, the azimuth ambiguity, which exists extensively in conventional single-well imaging, is solved with an improved imaging procedure using combined monopole–dipole logging data in addition to conventional logging data. Furthermore, we demonstrate that the direct waves propagating along the boreholes with strong energy, can be effectively eliminated with the proposed combined monopole–dipole measurement mode. The reflections are therefore predominant in the combined monopole–dipole data even before the signals are filtered; thus, the reflections' arrival times in each receiver are identified, which may help minimize the difficulties in filtering conventional logging data. The optimized processing flow of the combined measurement mode logging image is given in this paper. The proposed combined monopole–dipole measurement mode may improve the accuracy of single-well imaging.

摘要：Resistance analysis is an important analytical method used to evaluate the hydrodynamic performance of High Speed Craft (HSC). Analysis of multihull resistance in shallow water is essential to the performance evaluation of any type of HSC. Ships operating in shallow water experience increases in resistance because of changes in pressure distribution and wave pattern. In this paper, the shallow water performance of an HSC design concept, the semi-Small Waterplane Area Twin Hull (semi-SWATH) form, is studied. The hull is installed with fin stabilizers to reduce dynamic motion effects, and the resistance components of the hull, hull trim condition, and maximum wave amplitude around the hull are determined via calm water resistance tests in shallow water. These criteria are important in analyzing semi-SWATH resistance in shallow water and its relation to flow around hull. The fore fin angle is fixed to zero degrees, while the aft fin angle is varied to 0o, 5o, 10o, and 15o. For each configuration, investigations are conducted with depth Froude numbers (FrH) ranging from 0.65 to 1.2, and the resistance tests are performed in shallow water at the towing tank of UTM. Analysis results indicate that the resistance, wave pattern, and trim of the semi-SWATH hull form are affected by the fin angle. The resistance is amplified whereas the trim and sinkage are reduced as the fin angle increases. Increases in fin angle contribute to seakeeping and stability but affect the hull resistance of HSCs.

摘要：对自动推断的优化工程设计技术及主要内容作了简要的描述,介绍了这种技术中对装配体上下文中约束的实现方法和根据设计要求进行各零件自动更新的实现过程,将这种设计思想运用于柴油机曲轴连杆总成部件设计中,并介绍了在ZH1120柴油机曲轴连杆总成部件设计中的应用实例。

摘要：以棉籽油为原料,KOH为催化剂,通过超声波强化制备生物柴油(FAME)。采用四因素二次正交旋转组合设计实验。结果表明:采用超声波强化与机械搅拌反应体系相比,反应时间从40min缩短至20min,节能效果明显;得出了超声强化合成FAME的最佳工艺条件为:醇油比6.5:1,超声时间20min,占空比28%,催化剂用量0.9%,FAME的得率为97.35%,所得生物柴油各项指标基本达到欧洲EN14214和0#生物柴油标准。

摘要：该项目位于榕城闽江旁,设计师在本次软装设计中解构流行与文化,突破风格界限,带着自我意识中对人文的理解和态度重新审视了陈设艺术与生活百态。设计从把控力的均衡上给人以稳定的心理感受。硬装设计干净明亮,软装则贯彻现代极简主义的原则。整个空间在协调中寻求冲突,在微妙的反差中获得鲜明的互补平衡。空间中的变调是色彩引发的视觉体验,颜色合而不同,中性灰作为过渡的中间色不偏不倚,让其他色彩在其衬映下呈现出最本质的面貌,一切都那么自然而然。

摘要：为了提高通信系统的能效,提出了一种高效正交载波调制方法。在该方法中,基于能效优先原则,采用频谱混叠、时域正交的椭圆球面波函数(prolate spheroidal wave function,PSWF)设计基带脉冲波形,通过正交的同频载波实现载波调制。理论分析及数值仿真了该调制方法的差错性能、频域能量集中度。仿真结果表明,带内能量聚集度可达99.8%,该特性可大幅减小对相邻用户的电磁干扰,并有利于提高信号的抗干扰性能。

摘要：设计了一种基于FPGA的高精度TDC,通过延迟链插值和多沿采样等方法,达到与全定制专用集成电路相同的时间精度,实测结果好于9 ps。采用多路选择器阵列和加法器构造的编码器将转换死时间降低到1个时钟周期。设计还使用了自校准的机制,增加了可移植性,可广泛应用于粒子飞行时间探测、核医学影像等领域。

摘要：20世纪 8 0年代参数化特征建模技术的崛起 ,使得零件的编辑修改更加方便 ,数据的可重复利用率和产品设计效率大大提高 ,是CAD技术的突破。但是 ,参数化特征建模技术是基于零部件级的技术 ,而超变量几何相关性技术wave是基于装配级的全相关总体参数化技术 ,特别适合于大型复杂产品的设计 ,是产品系列化、变型产品的快速设计变更的强有力工具 ,是参数化造型设计与系统工程的有机结合 。

摘要：以D型圆柱形氢镍电池作为研究对象,其结构关联性紧密,电池造型复杂,传统自底向上的设计流程已经达不到当今市场对设计的要求。介绍了NX/wave技术和思想及自顶向下的设计方法。基于此技术方法,研究了圆柱形氢镍电池结构设计的wave技术,这样可以有效地梳理辨析出电池结构之间的关联关系和配合关系,解决电池结构设计知识有效重用的问题。很大程度地减少了电池的设计所需设计周期,设计效率也得到提升,wave技术的价值优势在此得到体现。