环形超声波电机定子振动模式分析

论述了环形超声以电机的工作原理首次引入等效梁的概念，建立了环形超声波电机关键结构即定子复合振子的数学模型，给出了其振动模式的解析解和仿真计算结果；分析了定子表面粒子的椭圆运动及超声波电机的本质；并给出了实际的样机结构。     

关于光纤温度传感器的研究

本文首先从理论上较系统的描述了GaAs半导体光纤温度传感器的构成原理,并据此建立了有关的设计计算方法和技术。提出用LED耦合双尾纤的方法构成光纤温度传感系统,可有效解决长时间实时温度遥测的问题。文章还介绍了利用单板机实现数据采集的硬件和软件技术。这一研究成果使这种传感器具有多路智能化温度实时监测能力,向实用化阶段前进了一步。     

铸锭补缩特性曲线的三次样条研究及其规律探讨

本文根据铸锭用空心微珠冒口缩孔形成过程的特点,以实验测试的方法测定了冒口的补缩过程。通过对数据样条研究的结果表明:冒口的补缩特性受浇注工艺等诸因素的影响,但均具有指数函数y=Ae~(-B/x)的特征。作者认为,其结果有助于深入认识铸件的凝固机理,特别是对冒口下偏析规律的研究。并为定量地研究冒口对铸件的补缩以及冒口的热工过程提供了依据。     

低温等离子体处理填料对填充塑料性能影响的研究——等离子处理填料的表面改性效果评价

本文是用 Ar-C_3H_6低温等离子体处理重质碳酸钙粉末及其对填充塑料性能影响的系列研究工作之一,在本文中主要研究了用浸润热测量法对等离子体处理粉末的改性效果进行评价和不同处理条件对重质碳酸钙粉未改性的影响。结果表明:用浸润热测量法评价等离子体处理粉未的改性效果是可行的;处理时间、气体流量和放电功率等各种处理条件均能影响重质碳酸钙粉未的改性。     

基于FPGA的脉冲分频技术研究

为了对运动控制系统中的脉冲进行精确控制以减少累计误差,需要对脉冲进行分、倍频和合成处理.介绍了通用的各种形式分频器的实现方法,给出了在Ahera公司的Cyclone II系列EP2C8Q208C8型号FPGA芯片上实现的电路原理图和测试结果,验证了设计的正确性和可行性.由于设计采用了参数化的方法,因此具有广泛的应用价值.     

Soft -ideals of soft BCI-algebras

Molodtsov [D. Molodtsov, Soft set theory–First results, Comput. Math. Appl. 37 (1999) 19–31] introduced the concept of soft set as a new mathematical tool for dealing with uncertainties that is free from the difficulties that have troubled the usual theoretical approaches. Jun [Y. B. Jun, Soft BCK/BCI-algebras, Comput. Math. Appl. 56 (2008) 1408–1413] applied first the notion of soft sets by Molodtsov to the theory of BCK/BCI-algebras. In this paper we introduce the notion of soft p-ideals and p-idealistic soft BCI-algebras, and then investigate their basic properties. Using soft sets, we give characterizations of (fuzzy) p-ideals in BCI-algebras. We provide relations between fuzzy p-ideals and p-idealistic soft BCI-algebras.     

Notes on redefined fuzzy implicative filters of lattice implication algebras

The concept of -fuzzy implicative filters of lattice implication algebras is introduced and some of its related properties are investigated. In particular, the relationships among the ordinary fuzzy implicative filters, the (∈,∈∨q)-fuzzy implicative filters and the -fuzzy implicative filters of lattice implication algebras will be studied.     

A quantitative methodology for acquiring engineering characteristics in PPHOQ

Quality function deployment (QFD) is a planning and problem-solving methodology that is widely used for translating customer requirements (CRs) into engineering characteristics (ECs) of a product. Acquiring ECs in product planning house of quality (PPHOQ) is a crucial step of QFD methodology. In previous studies, methods for acquiring ECs are qualitative and subjective. In this paper, a novel quantitative methodology for acquiring ECs in PPHOQ is presented. In the proposed methodology, a hierarchical framework for generating the refined set of EC candidates from the EC candidates obtained by brainstorming is established. A concept of a general relationship between a CR and an EC is introduced, and then a novel approach for identifying the general relationship measures with the help of intelligent characteristics of rough set is proposed. Another concept of the intension threshold of the general relationship corresponding to a CR is introduced, and then a set-operation-based method of acquiring ECs used in PPHOQ is presented. An example of a two-cylinder washing machine is used to demonstrate the proposed methodology.     

Sliding-mode observers for systems with unknown inputs: A high-gain approach

Sliding-mode observers can be constructed for systems with unknown inputs if the so-called observer matching condition is satisfied. However, most systems do not satisfy this condition. To construct sliding-mode observers for systems that do not satisfy the observer matching condition, auxiliary outputs are generated using high-gain approximate differentiators and then employed in the design of sliding-mode observers. The state estimation error of the proposed high-gain approximate differentiator based sliding-mode observer is shown to be uniformly ultimately bounded with respect to a ball whose radius is a function of design parameters. Finally, the unknown input reconstruction using the proposed observer is analyzed and then illustrated with a numerical example.