摘要：The B-spline surface is one of the most commonly used parametric surface in computer aided geometric design and computer graphics. To develop more convenient techniques for designing and modifying B-spline surface is an important problem. A new method for the shape modification of B-spline surface with geometric constraints is presented in this paper. The deformation energy of the physically based B-spline surface is minimized based on finite element method, while geometric constraints including point, curve and boundary continuity constraints can be imposed to control the modified shape. By setting the external force zero, the surface is modified by the constraints solely. This lead to a simplified linear system to be solved and to eliminate the need of internal energy that could convert the iteration process of finite element function to a faster change for control points vector, such that the modified surface satisfies the given constraints. Practical examples are also given.

摘要：用机械合金化方法制备可降解Mg-Zn合金,并用分式析因设计法建立统计学模型来预测块体合金的弹性模量和腐蚀质量损失。研究机械合金化参数(球磨时间、球磨速度、球料比和Zn含量)及其交互作用对合金性能的影响,共涉及4因素2次重复,因此进行了16次2水平分式析因设计。方差分析(ANOVA)、回归分析和R2测试结果表明此模型预测精度高。统计模型预测的可降解Mg-Zn合金的弹性模量为40.18~47.88 GPa,类似于自然骨(30-57 GPa)。添加质量分数为3%~10%Zn(9.32~15.38 mg)后,可以改善合金的耐腐蚀性能,腐蚀后纯Mg质量损失约33.74 mg。最显著的自变量是Zn含量,且只有球磨时间和球料比的交互作用具有显著性,P值小于0.05。建立的模型可以从统计学上有效预测可降解Mg-Zn合金的力学性能(通过弹性模量反映)和耐腐蚀性能(通过重量损失反映)。

摘要：This paper presents a real-time battery management unit designed by applying the Coulomb counting method and intended for use in an integrated renewable energy system for PV-Hybrid power supply. Battery management is required to stabilize hybrid systems and extend battery lifetimes. The battery management unit is divided into three main stages. Firstly, analysis of the basic components of the battery type used in the system is considered. Secondly, the state of charge (SOC) estimation method and the deterioration factor of the battery are analyzed. Finally, the overall battery management system, including a computer-based measurement and control unit, is constructed. The control system displays real-time information through LabVIEW 8.5 by estimating the state of charge through various measurements. The system will issue alerts when malfunctions are detected, and the operator can analyze and react to the system in real time to stabilize the system and extend the battery lifetime.

摘要：采用混合概念设计方法,对油棕复合材料汽车防撞箱进行了概念设计。结合创新问题解决(TRIZ)理论、形态图和仿生学,考虑材料特性、功能规格、力识别、根本原因分析、几何形状和设计选择标准等方面的首要要求。该策略是利用自然物来激发五种创新的ACB结构的概念设计,并运用层次分析法进行两两分析来选择最佳的ACB概念设计。复合ACB的新概念设计考虑到了天然纤维的特性,而不像传统材料如钢合金和铝合金。排名最高(26.6%)的设计被选为最终的概念设计,该设计的最外层具有蜂窝结构,内部结构由蜘蛛网结构强化,中心部位是由啄木鸟海绵组织中提取的纤维泡沫结构支撑,以达到能量吸收能力最大化。新的设计可以解决ACB在碰撞过程中无法吸收最大冲击能量的主要原因-弯曲塌陷的问题。但是,为了生产和装配需要,最后的概念设计仍需修改,这些修改将在今后研究中完成。

摘要：Levulinic acid(LA) has been identified as a promising green,biomass derived platform *** surface analysis(RSA) with a four-factor-five-level central composite design(CCD) was applied to optimize the hydrolysis conditions for the conversion of bamboo(Phyllostachys Praecox ***) shoot shell(BSS) to LA catalyzed with ionic liquid [C4mim]*** effects of four main reaction parameters including temperature,time,C[C4mim]HSO4(initial [C4mim]HSO4 concentration) and XBSS(initial BSS intake) on the hydrolysis reaction for yield of LA were analyzed.A quadratic equation model for yield of LA was established and fitted to the data with an R2 of 0.9868,and effects of main factors and their corresponding relationships were obtained with *** validation and results of CCD showed good correspondence between actual and predicted *** analysis of variance(ANOVA) of the results indicated that the yield of LA in the range studied was significantly(P<0.05) affected by the four *** optimized reaction conditions were as follows:temperature of 145 ℃,time of 103.8 min,C[C4mim]HSO4 of 0.9 mol.L-1 and XBSS of 2.04%(by mass),respectively.A high yield [(71±0.41)%(by mol),triplicate experiment] was obtained at the optimum conditions of temperature of 145 ℃,time of 104 min,C[C4mim]HSO4 of 0.9 mol.L-1 and XBSS of 2%(by mass),which obtained from the real experiments,concurred with the model prediction [73.8%(by mol) based on available C6 sugars in BSS or 17.9%(by mass) based on the mass of BSS],indicating that the model was adequate for the hydrolysis process.

摘要：This paper investigates experimental design (DoE) for the calibration of the triaxial accelerometers embedded in a wearable micro Inertial Measurement Unit (μ-IMU). Firstly, a new linearization strategy is proposed for the accelerometer model associated with the so-called autocalibration scheme. Then, an effective Icosahedron design is developed, which can achieve both D-optimality and G-optimality for linearized accelerometer model in ideal experimental settings. However, due to various technical limitations, it is often infeasible for the users of wearable sensors to fully implement the proposed experimental scheme. To assess the efficiency of each individual experiment, an index is given in terms of desired experimental characteristic. The proposed experimental scheme has been applied for the autocalibration of a newly developed μ-IMU.

摘要：The engineering problems today become more and more complex particularly in the area of new product development. It requires the multi-disciplinary design method to solve complex problems. This paper presents an integrated design system for solving complexity during multi-disciplinary design. Complexity could be solved if the design problems, given by any individuals who are concerned, are structured. The design system uses the multi-viewpoint concept to allow experts to share their information and knowledge in common views. Knowledge modules are used to store semantics from the experts of different disciplines. Then the system agent acts as an internal designer to help support the individuals to translate any semantics provided from one discipline and then propagate to other related disciplines. With these tools, the integrated design system can structure and solve the complexity of design problems.

摘要：各种各样的 3D 建模软件为设计被开发了并且生产。商业地可得到的软件使用土著人文件格式的大多数，它不能被另外的软件读或理解。这份报纸为虚拟生产处理一个 3D 模型变换程序的一条通用途径的开发(VM ) ，用一条词汇分析器生成器法律和开的图形的图书馆(OpenGL ) 。程序能变换在四种通用文件格式之间的 3D 网孔数据，即， Stereolithography (STL ) ，虚拟现实建模语言(VRML ) ，可扩展的标注语言(XML ) ，和目标(OBJ ) 。简单集会功能能被用于进口模型。四元数角度被用于目标旋转克服万向节锁的问题或旋转自由的一度的损失。程序被进口中立格式模型进程序验证了，使用转变，救有一个新坐标系统的新模特儿，并且最后出口进另外的商业软件。结果证明程序能精确地显示并且重排从不同通用文件格式和那的几何学数据它能在 VM 被使用。因此，从一个 VM 系统的产量模型能在一种通用文件格式被转移或进口到另一个 VM 系统。

摘要：Model of elliptical trainer and 3D human body are built with the ergonomic module of CATIA V5 to study ergonomic characteristics of fitness equipments as a preliminary evaluation of elliptical trainer.

摘要：采用基于灰色Verhulst模型(GVM)的智能反分析(IBA)方法确定隧道围岩的岩土参数,并通过对朝鲜“6.13”煤矿−600 m水平主巷道试验验证了该方法的准确性。用于反分析的位移分量为开挖结束时监测到的拱顶沉降和边墙收敛量,以及GVM预测的最终闭合量。利用FLAC3D的人工神经网络(ANN)和Burgers蠕变粘塑性(CVISC)模型,得到了位移与反分析参数之间的非线性关系。然后,利用遗传算法(GA)确定了隧道围岩的最优参数,并利用GVM预测了最终开挖和闭坑时的两组实测位移。采用反分析参数数值模拟的计算位移与原位位移的最大绝对误差(MAE)和标准差(Std)分别小于6 mm和2 mm。结果表明,该方法可用于确定巷道、地下空区、矿山空场和采场的设计参数和稳定性。