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Economist video. How we designed this week's cover
How we designed this week's cover.
Streaming Video
Dimensional synthesis of motion generation of a spatial RCCC mechanism
A dimensional synthesis method for a spatial RCCC rigid-body guidance mechanism that satisfies non-periodic design requirements is proposed. By solving the 21-dimensional spatial RCCC mechanism motion generation problem in five steps, the dimension of the numerical atlas database is effectively reduced. The installation angle parameters, link twists, link lengths and link offset are matched using the established numerical atlas database. The mechanism geometric parameters obtained from the database are then optimized using a genetic algorithm. On this basis, the equations for calculating the actual sizes and installation position parameters of the objective mechanism are established; thus, the spatial RCCC mechanism motion generation with non-periodic design requirements is realized. Since there are fewer independent variables in each step of the proposed reduced dimensional synthesis method, the computational burden is smaller than existing numerical atlas method. Avoiding the solution of complex nonlinear equations, the method is therefore not limited by the number of prescribed positions compared with the analytical method. Moreover, since the problem of synchronous optimization of input angles and geometric parameters is avoided, the efficiency is far higher than optimization method. Two examples are presented to demonstrate the efficacy and accuracy of the proposed theory.
Journal Article
Noise Reduction of Pipes under Sound Excitation via Various Attached Composite Structures
Pipe systems are broadly used in modern buildings and large transportation vehicles. The reduction of noise from pipes is one of the main concerns in their engineering applications. In this paper, the reduction of the radiated noise from pipes is studied experimentally using various attached structures. An experimental system is constructed in an anechoic room. Three types of attached structures are considered, including foam coatings, distributed absorbers and periodic absorbers. Via the comparison of basic pipe and pipes with different noise control designs, the reduction effects from the attached structures are compared and analysed. The results show that the radiated noise is effectively reduced by the foam coatings and distributed absorbers, especially, at most of the peaks of the noise. The distributed absorbers reduce the noise more on the whole. The low frequency peaks (below 200Hz) of the noise are reduced most by the periodic absorbers. Via the proper design of the structure types and corresponding parameters, the low frequency property, the broadband property and the reduction amplitude will be obviously enhanced.
Journal Article
Designing the editorial experience : a primer for print, Web, and mobile
Find examples of editorial design, audiences for content, what forms the content takes, and how workflow is managed. This book provides a primer on the elements of editorial design that result in rich editorial experiences.
eBook
A Fast, Simple, and Approximate Method for a Minimal Unit Cell Design of Glide-Symmetric Double-Corrugated Parallel-Plate Waveguides
Glide-symmetric double-corrugated parallel-plate waveguides (GS-DCPPWs) have essential technical properties such as an electromagnetic bandgap, lower dispersion, and the ability to control the equivalent refractive index. For this reason, a fast and simple analysis and design of GS-DCPPW structures have great importance to improve related microwave systems. This paper introduces a novel design methodology based on the auxiliary functions of generalized scattering matrix (AFGSM) for the dimensional synthesis of GS-DCPPWs. We test the applicability of the AFGSM method on a variety of numerical examples to determine the passband/stopband regions of single and GS-DCPPWs before applying the design procedure. Certain design specifications are chosen, and unit cell dimensions are constructed in accordance with the proposed design technique. Three design scenarios are considered to assess the success of how well the design criteria can be met with the proposed method. The designed unit cells have been periodically connected in a various finite numbers to create periodic filters as a test application for adjusting the electromagnetic bandgap. The success of the periodic GS-DCPPW filters obtained with the proposed design strategy in meeting the specified design requirements has been tested using full-wave electromagnetic simulators (CST Microwave Studio and HFSS). The results indicate that the combined use of the equivalent transmission line circuit and the root-finding routine provided by the proposed method facilitates rapid, efficient, versatile, and approximate designs for corrugated parallel-plate waveguides. Moreover, the design methodology provides the viability of developing a minimal unit cell and a compact periodic filter performance with respect to the literature counterparts.
Journal Article