Papers by Keyword: Conditioning

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Authors: Dong Sheng Li, Wen Xing Fu
Abstract: This paper studies the architecture of the ground monitoring system of a certain missile’s distributive guidance module and discusses in some detail the signal processing methods for controlling the power supply voltage, generating and acquiring the switching values, acquiring the analogue quantity and the image etc. The discussion results show that the electricity of the earth monitoring system can be fully insulated from that of the missile under testing, thus ensuring its safety. The signal processing methods can accurately generate and acquire various types of signal through normalization, adaptation and conditioning, thus being applicable to engineering practices
Authors: Pei Lum Tso, Weng Hong Lin
Abstract: The high hardness of brittle materials always make it hard to machine with traditional grinding wheels. Conventionally a diamond grinding wheels was used to improve the poor processing capability. Usually the specific grinding energy had been used as an indicator of machinability. According to its definition, the specific grinding energy increases with the active contact area of the grinding wheel decreases. In other words, reducing the surface contact area of the grinding wheel can enhance the specific grinding energy effectively. Conditioning grooves on grinding wheels not only enhance the specific grinding energy, but also achieve the effect of reducing the heat dissipated during the grinding processes. With the proper selection parameters, the high cost of diamond grinding wheel may be replaced by less expensive conventional green carbon and aluminum oxide wheel. In this studies, the relationship between the surface topography of grinding wheels and the grinding capability of brittle materials was investigated. The results show that, the traditional grinding wheel dressing properly while the depth of cut less than 20μm with the rhombic pattern and the depth of cut more than 20μm with the groove-like pattern can grind the brittle materials as good as using diamond wheel.
Authors: Qing Liu, Mu Qing Wu, Ting Ting Zhang
Abstract: Cognitive Radio is an intelligent radio that should be adapted to the time-varying environment. However, an adaptive fusion rule has been investigated by a rather limited work. In this paper, we present a new approach which is derived from the inspiration of human learning mechanism based on conditioning in behavioural theory. The framework and algorithmic flow are introduced. Moreover, the proposed method is proven to perform well in the dynamic circumstance by the result of the simulation.
Authors: P. Pekarski, Reiner Kirchheim
Authors: Qing Liang Zhao, Jun Yun Chen, Jun Yao
Abstract: In this paper, a copper-resin bonded diamond wheel was applied to machine the optical glass on a precision grinder. The process of truing and pre-dressing with ELID (electrolytic in-process dressing) were first carried out for the grinding wheels, then the ELID assisted grinding experiments were conducted with the special fine and coarse grained diamond wheels. The experimental results show that the fine and coarse grained wheels can all generated the smooth surface with the surface roughness in nanometer scale and the coarse grained diamond wheel correlates to the slightly more surface damage than the fine grained diamond wheel, which also proves that the high efficient grinding of the optical glass with a good surface quality can be realized with the coarse grained copper-resin wheel on a precision grinder and the grinding wheels were all well conditioned with the conditioning method presented in this paper.
Authors: Qing Liang Zhao, Ekkard Brinksmeier, Otmann Riemer, Kai Rickens
Abstract: In order to realize ductile machining of optical glasses using mono-layer nickel electroplated coarse-grained diamond grinding wheel, a novel conditioning technique features using a copper bonded diamond grinding wheels of 15m grain size dressed by ELID (electrolytic inprocess dressing) to condition the 46m grain sized diamond wheel has been developed. During the conditioning process, a force transducer was used to monitor the conditioning force, a coaxial optical distance measurement system was used to in-situ monitor the modified wheel surface status. White-light interferometry (WLI), scanning electron microscopy (SEM) and atomic force microscopy (AFM) were used to characterize the conditioned wheel surface status as well as the ground optical glass surface topography correspondingly. The experimental result indicates that a minimized wheel radial run-out error of less than 2μm as well as the top-flattened diamond grains of constant wheel peripheral envelop profile were generated on a 5-axis ultra-precision machine tool. The grinding experiment proved that the well conditioned 46μm coarse-grained diamond wheel can be used in realizing the ductile grinding of optical glass BK7, which indicates that the newly developed conditioning technique is feasible and applicable to introduce the coarse-grained diamond wheels into precision machining of brittle and hard-to-machine materials.
Authors: Chamlong Phoosodsoong, Chanoknun Sookkumnerd
Abstract: Amount of water content in fresh air phenomena direct heat affect to be changed fresh air to hot air state for reducing refined sugar moisture during drying and conditioning process. A change relative humidity of air results in a significant variation of heat transfer rate. Therefore, in this research energy reduction of refined sugar drying and conditioning process study of these phenomena was conducted both experimentally and theoretically. Several experiments was performed employing a rotary dryer and a conditioning silo. In each experiment one of the air moisture content was changed and the resulting consumption of steam changed on the process was measured. The objective of this research was to reduce exhaust steam to heated up fresh air to hot air by installing dehumidifier. Evaluation of these results showed that the low humidity of fresh air are well suited for applied of refined sugar drying process, giving the perfect performance in which quality of refined sugar impacted can be eliminated and reduction of energy can thereby improve, with the aim of enhancing energy saving.
Authors: Qing Liang Zhao, Da Gang Xie, Ekkard Brinksmeier, Otmann Riemer, Kai Rickens
Abstract: A novel conditioning technique to precisely and effectively condition the nickel electroplated mono-layer coarse-grained diamond grinding wheel of 91m grain size was developed to fabricate a Diamond Micro Tool Array (DMTA) in ductile machining of brittle materials. During the fabricating process, a copper bonded diamond grinding wheels (91m grain size) dressed by ELID (electrolytic in-process dressing) was applied as a conditioner, a force transducer was used to monitor the conditioning force, and a coaxial optical distance measurement system was used to insitu monitor the modified wheel surface status. The experimental result indicates that the newly developed conditioning technique is applicable and feasible to generate required wheel topography of less than 2μm run-out error and grain geometries. The taper cutting test on BK7 proves the fabricated DMTA is capable of realizing ductile machining of brittle materials.
Authors: Edurne Ochoa de Zabalegui, Julian Arriaran, Juan Carlos Bicandi, Daniel Ferrer
Abstract: Using thermal analysis a preliminary study of the evolution of the metallurgical quality was carried out, concluding that it was strongly deteriorated during the Mg treatment, worsened at the pouring furnace. In order to improve the metallurgical quality a new phase of conditioning before the Mg treatment has been implemented. Also a special ladle was designed and built to be able to perform this new process stage in a robust manner. In this way the main objective was reached, increasing the metallurgical quality of the melt inside the treatment ladle and also at the pouring furnace, obtaining at the same time better process stability. The metallurgical quality improvement reflects at the cooling curves (stable solidification patterns), at the microstructure (higher nodule count, better graphite distribution and more ferrite content in the matrix) and at the mechanical properties (less tensile strength, higher elongation, less hardness and higher impact toughness) of the casting parts.
Authors: Danuta Cozma, Ioan Tenu, Cezara Zapodeanu
Abstract: In this paper there are observed some aspects regarding wheat conditioning which has as target phisico-mechanical and structural properties changing, in order to improve the quality of flower obtained by milling. It is presented the research methods which include the use of a milling stand and a hydrothermal treatment device of wheat. The results of the experimental attempts are shown in the tables and graphics and the conclusions obtained are presented at the end of the paper.
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