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关于扬琴声学系统与律制问题
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作者 唐俊 《黄河之声》 2009年第16期56-58,共3页
本文根据韩宝强先生提出"乐器声学系统"的概念,对扬琴振动、激励、传导、共鸣和调控五个声学系统进行了分析,同时在扬琴声学特征和扬琴律制做了逐一介绍,并通过声学阻尼振动理论解决了扬琴"狼音"问题。
关键词 扬琴 声学系统 声学特征 阻尼振动理论 律制
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Static-deformation based fault diagnosis for damping spring of large vibrating screen 被引量:7
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作者 彭利平 刘初升 +1 位作者 李珺 王宏 《Journal of Central South University》 SCIE EI CAS 2014年第4期1313-1321,共9页
Based on the statics theory, a novel and feasible twice-suspended-mass method(TSMM) was proposed to deal with the seldom-studied issue of fault diagnosis for damping springs of large vibrating screen(LVS). With the st... Based on the statics theory, a novel and feasible twice-suspended-mass method(TSMM) was proposed to deal with the seldom-studied issue of fault diagnosis for damping springs of large vibrating screen(LVS). With the static balance characteristic of the screen body/surface as well as the deformation compatibility relation of springs considered, static model of the screen surface under a certain load was established to calculate compression deformation of each spring. Accuracy of the model was validated by both an experiment based on the suspended mass method and the properties of the 3D deformation space in a numerical simulation. Furthermore, by adopting the Taylor formula and the control variate method, quantitative relationship between the change of damping spring deformation and the change of spring stiffness, defined as the deformation sensitive coefficient(DSC), was derived mathematically, from which principle of the TSMM for spring fault diagnosis is clarified. In the end, an experiment was carried out and results show that the TSMM is applicable for diagnosing the fault of single spring in a LVS. 展开更多
关键词 static deformation suspended mass method large vibrating screen damping spring fault diagnosis
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Experimental analysis of Tuned Liquid Damper (TLD) for high raised structures
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作者 S. Arash Sohrabi Samad Dehghan 《Journal of Civil Engineering and Architecture》 2009年第5期40-45,共6页
Tuned liquid damper is one the passive structural control ways which has been used since mid 1980 decade for seismic control in civil engineering. This system is made of one or many tanks filled with fluid, mostly wat... Tuned liquid damper is one the passive structural control ways which has been used since mid 1980 decade for seismic control in civil engineering. This system is made of one or many tanks filled with fluid, mostly water that installed on top of the high raised structure and used to prevent structure vibration. In this article we will show how to make seismic table contain TLD system and analysis the result of using this system in our structure. Results imply that when frequency ratio approaches 1 this system can perform its best in both dissipate energy and increasing structural damping. And also results of these serial experiments are proved compatible with Hunzer linear theory behavior. 展开更多
关键词 TLD seismic table structural system Hunzer linear behavior
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