Papers by Keyword: Geometric Design

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Authors: Jin Huang, Song Chen, Ping Wang
Abstract: A magnetorheological (MR) valve is a device that uses the MR fluid flowing through a cylindrical orifice. In this paper, based on volumetric flow rate equation in the cylindrical MR valve, the necessary active MR fluid volume and the thickness between two cylinders of the valve are carried out. They are the minimum active fluid volume and gap of MR fluid exposed to the magnetic field. The equations for the volume and the gap derived to provide the theoretical foundation for the key geometric design in the valve. The results indicate that the volumetric flow rate can be continuously adjusted by an external magnetic field. The thickness and the volume for the cylindrical MR valve can be calculated based on MR fluid properties, the desired control pressure ratio, and the pressure of the valve.
Authors: Liang Chen, Cheng Hui Gao, Guo Dong Jin
Abstract: The essence of the multidisciplinary collaborative design problem (MCDP) is the coordination of the design variables among multiple disciplines on the basis of the all constraints of all disciplines. There exist some problems such as the early detection of design conflicts and the determination of the consistency domains of the design variables, etc. The resolving of these problems can help designers avoid bad decision-making, reduce the design iteration and improve the design efficiency. Aiming at the problems, this paper proposes a constraint-net model to describe and manage all the design variables and constrains of all disciplines, discusses the reformulating method of the MCDP to improve computation efficiency, and develops the interval propagation algorithm to determine the consistency domains of the design variables, etc. A gear drive is taken as an example to illustrate the effectiveness of the proposed method.
Authors: Jing Xue, Nan Li, Xiang Dong Yang
Abstract: A multi-spiral capacitive sensor is proposed to improve the sensor performance, and the relation between the geometric parameters design of the sensor and the sensor performance is discussed. Compared to traditional sensors, under the same measurement conditions, the electrical field distribution of the multi-spiral-shaped sensor is presented. The detail effects of the sensor design parameters, such as gaps between the sensor electrodes, the effective area and the geometry of the sensor plates are qualitative analyzed. The experimental results prove that the complex structure sensor can improve the measurement linearity, signal strength and measurement sensitivity.
Authors: Jian Jun Zhou, J.X. Hu, Min Huang
Abstract: Geometric design procedures for the cycloidal drive with ceramic ball meshing elements were introduced. Using the theory of conjugate surfaces, the equations of meshing of the cycloid drive and the cycloid raceway profiles were derived. Design examples were presented to demonstrate the design procedure and feasibility. The ceramic balls were used as the meshing elements. Prototype of this research was made and tested with satisfying results. The results of this work are suitable for computeraided design and manufacture of industrial applications.
Authors: Ta Shi Lai
Abstract: This paper presents geometric design procedures for a new type of roller drive. Here, the pinion has two circularly arrayed cylindrical teeth instead of one circularly arrayed. This proposal is based on coordinate transformation and envelope theory, from which the epicycloid profiles are obtained. The centers of the cylindrical teeth of the pinion are determined by equidistant offset a distance 3 ρ (pinion-tooth radius). The real pinion profiles are the equidistant curve of the epicycloid profiles. Two examples are presented to demonstrate that this approach is feasible.
Authors: Li Lun He, Xi Bin Wang, Zhi Bing Liu, Ming Chen, Zong Wei Xu
Abstract: The mathematical modeling of the cutting tools is an important aspect for the design and manufacturing engineers from the viewpoint of shape realization. Taper mill is composed of side and end edges. In order to make each patch closely combined, the groove section is designed by considering the relation among tapered radius, groove depth and radius of inner land. Through translation and rotation of shape curve, the side flute and end flute model can be established. These models can be rendered in three dimensional software according to parametric design of taper end mills. And this methodology can be easily extended to design, manufacture other tools.
Authors: Ya Ping Zhou, Hong Bin Zhuang
Abstract: An intersection with protected pre-signal is proposed in the paper to explore the potential capacity of intersections. The space between the main signal and the pre-signal is isolated as an exclusive waiting area. The relationship between the capacity and the arrival rates in the design is investigated and the sensitivities of length of waiting area, signal timing and arrival rates are presented. The comparison among Continuous Flow Intersection, the method Xuan (2011) proposed and the design in the paper is proposed. The results show that Median U-Turn intersections with protected pre-signal is expected to increase the capacity and decrease the average delay of intersections.
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