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The compliant double parallel four-bar mechanism is a classical parallel guiding mechanism. A multiple-step beams model was established to analyze the static stiffness characteristics of the double parallel four-bar mechanism with right angle flexible hinges based on the symmetry of its structure. Formula for calculating the static stiffness was derived by applying singularity function. On the basis...
In this paper, basic principles of Hilbert-Huang transformation and the theoretical basis, based on which Hilbert-Huang transformation can be applied to analysis acoustic emission signal of fiber reinforced plastics acquired during tensile tests, are expatiated simply. Moreover, through several practical signal processing examples, it is observed that time-frequency characteristics of AE signals are...
In this paper, we extend the Langevin noise (LN) scheme to an anisotropic medium which shows loss and dispersion. And the results are compared with previous work.
Determination of optimal machining parameters - spindle rate, feed rate, and depth of cut - has been a research topic for decades. Since the parameters of CNC machining significantly influence part machining time, part surface quality, and tool life, techniques of determining optimal machining parameters are in high demand in manufacturing industry. Usually the depth of cut and spindle rate are determined...
High Definition (HD) content delivery over IP networks has become a reality in the market of entertainment technologies. This paper presents a professional testbed deployed to emulate a real use case of delivering high definition TV material over an IPTV network. The quality of the delivered H.264/AVC encoded video was evaluated by common objective video quality assessment tools in emulated environment...
The measuring of the real-time discharge of concrete pump is an issue which must be solved urgently. The mathematic model of the concrete pump discharge is established based on the working principle of concrete pump. The measuring method based on pressure is put forward. By measuring and analyzing the pressure in the material cylinder, calculating the real-time pumping efficiency, the real-time discharge...
The characteristics of current measuring methods of concrete pump discharge are analyzed, and the shortage of these methods is pointed out. According to the working principle of concrete pump, the mathematic model of the concrete pump discharge is established. The real-time measuring method of concrete pump discharge, which is based on pressure in the master cylinder, is put forward. By measuring...
Explosion damage effect of Massive Ordnance Penetrator (MOP) is more than 10 times the explosive power of its predecessor, the BLU-109. The targets of MOP will be deeply underground headquarters and hard deeply buried targets. It has been simulated by using LS-DYNA finite-element software to analyze damage effect of MOP, which MOP attacks underground protective works under different deepness from...
Cutting stock problems can be found in various industries. They arise, for examples, with machining, timber processing, paper-making, etc. 1.5-dimensional cutting stock problem is a problem between one-dimensional cutting and two-dimensional cutting. In this study, a two-stage approach is developed for 1.5 dimensional cutting problem. 1.5-dimensional cutting problem is changed into one-dimensional...
Nano-sized powders of transparent conductive aluminum-doped zinc oxide (AZO) have been successfully prepared by electrolysis-modified co-precipitation method. By adding ammonium hydroxide into the precursor solution prepared by electrolytic dissolution of zinc metal in a buffered electrolyte solution of nitric acid and ammonium nitrate with adequate addition of aluminum nitrate, co-precipitate precursors...
In this paper, the far field properties of the lossless metamaterial covered perfectly conductor and air cylinder are discussed. The model configuration is given. Under different geometrical and electromagnetic parameters, the far field properties of the model are investigated through the directivities and normalized radiation resistances. Important regularity is obtained.
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