Papers by Keyword: SPL

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Authors: Da Lin Chen, Nan Chen
Abstract: This paper demonstrates an investigation about the active control of sound radiation in the enclosure cavity consists of two flexible plates. One of the flexible plates is driven by a point force to generate the primary sound field in the cavity, and using some point forces which are located at different locations on the receiving plate to suppressing the panel vibration and then to minimum the cavity sound pressure level (SPL); meanwhile some actuators are located on the other panel surfaces to reduce the sound pressure level at some frequencies that can’t be well reduced by only effect on one panel. The better result shows the possibility of applying distributed cooperative control method to the structural-acoustic coupled system.
Authors: Da Lin Chen, Nan Chen
Abstract: This paper analytically demonstrates the use of some point forces actuators applied on different flexible plates to reduce the radiated sound in the cavity. A rectangular enclosure involving two opposite flexible plates is considered. We want to get the dominant factors that impact the coupling effects and the noise reduction in the cavity with the ASAC method, so we make some point forces located on different plates and to compare their different control effect. The formula was derivate to calculate the sound pressure in the enclosure when there some point forces applied on the flexible plates, and then analyzed and get the simulation of the sound pressure level (SPL) response in the local cavity sound field. The paper indicated that applying distributed cooperative control method can get the better reduction of noise.
Authors: Guo Jun Su, Jin Wang, Li Guo Tian
Abstract: Modeling by Petri net for DEDS has been widely used including the robot technology and Semiconductor production line (SPL). It is critical to build a reliable model of DEDS for assessing and optimizing the scheduling of production resources. The HCTPN (Hierarchical Colored-Timed Petri net) model is proposed in this paper, which can effectively deal with the model explosion of basic Petri net by enhancing the describing ability of basic Petri net (the color factor and the time factor will be introduced to the Petri net) and introducing the hierarchical Petri net. At the last of the paper, the simulation results show the effectiveness and reliability of the established HCTPN model of SPL by CPN Tools.
Authors: L.B. Zhang, J.X. Shi, Ju Long Yuan, Shi Ming Ji, M. Chang
Abstract: Scanning probe microscopy (SPM) has proved to be a powerful tool not only for imaging but also for nanofabrication. SPM-based nanofabrication comprises manipulation of atoms or molecules and SPM-based nanolithography. SPM-based nanolithography, referred to as scanning probe lithography (SPL) in this review, holds good promise for fabrication of nanometer-scale patterns as an emerging generic lithography technique that STM, AFM, and SNOM are directly or otherwise used to pattern nanometer-scale features under appropriate conditions. Patterning methods including mechanical SPL, electrical SPL, thermal SPL, and optical SPL, are described in terms of SPL mechanisms. The newly developed variations of the above-mentioned SPL methods such as dip pen nanolithography, nanoshaving and nanografting, replacement lithography, constructive nanolithography, nanojet lithography, and electrostatic lithography, are also illustrated respectively. Analyses of prospective application of these SPL methods are presented finally.
Authors: Da Lin Chen, Nan Chen
Abstract: Multi-Agent system (MAS) is used to control the radiation noise in a rectangular enclosure, which is surrounded by two flexible plates and four rigid plates. The noise is generateded by the vibration of the exciting flexible plane. A MAS is established to coordinate the active noise control method, and these agents are controlled by a coordination object which includes compete and cooperative rules. These agents are competitiveness, so the MAS can provide fault-tolerant capabilities for the control mechanism. Meanwhile, these agents are independent and modular, and can be used in “Plug-and-Play” control field. The formula is derivate to calculate the sound pressure in the enclosure when there some point forces applied on the flexible plates, and the simulation shows using MAS to control the noise in the cavity is effective.
Authors: Zhao Xin Huang, Sai Ma, Hui Wang
Abstract: Uniform sound pressure level (SPL) distribution of linear phased loudspeaker array is limited by frequency. This paper widens the applicable frequency band of uniform SPL distribution in a linear listening area. By using an improved adaptive genetic algorithm (which contains a novel objective function, modified genetic operators and parameter setups) to control the directivity pattern details accurately, uniform distribution of SPL on a linear listening line in a wider frequency is achieved. The simulation and experimental results show that the SPLs on the test listening line are basically uniform from 200Hz to 500Hz, which demonstrates that the improvement of adaptive genetic algorithm is effective.
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