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基于设备因素的数控铣削表面质量研究
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作者 戴永红 韩雄 +1 位作者 祝红英 罗兴华 《制造技术与机床》 北大核心 2019年第7期135-139,共5页
零件表面质量问题在铣削加工方式中较为常见,直接影响产品寿命。为此重点研究高速数控设备因素导致的产品表面质量问题产生原因,通过案例深入分析形成故障的根本原因及排故过程,并探讨如何采用优化系统参数和PLC应用程序进行技术防错的... 零件表面质量问题在铣削加工方式中较为常见,直接影响产品寿命。为此重点研究高速数控设备因素导致的产品表面质量问题产生原因,通过案例深入分析形成故障的根本原因及排故过程,并探讨如何采用优化系统参数和PLC应用程序进行技术防错的途径。 展开更多
关键词 表面质量 波敏感度 角切除 安全集成功能 轮廓控制
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Sensitivity of Some Biological Objects to Repetitive Submicrosecond Microwave Pulses
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作者 L. P. Zharkova M. A. Buldakov +6 位作者 I. R. Knyazeva O. P. Kutenkov N.V. Litvyakov N.V.Mamonova N.V.Cherdyntseva M. A. Bolshakov V. V. Rostov 《Journal of Energy and Power Engineering》 2012年第6期925-931,共7页
The effect of repetitive pulsed microwaves (10 GHz, pulse duration of 100-300 ns, pulse repetition rate of 4-25 pulse per second, peak power density of 0.04-3.5 kW/cm^2) on mastocytoma P815, Ehrlich carcinoma, norma... The effect of repetitive pulsed microwaves (10 GHz, pulse duration of 100-300 ns, pulse repetition rate of 4-25 pulse per second, peak power density of 0.04-3.5 kW/cm^2) on mastocytoma P815, Ehrlich carcinoma, normal spleen cells and wound healing was investigated. It was found that short-time irradiation with an intensity of 0.9-1.5 kW/cm^2 inhibited proliferation of tumor cells in vitro, whereas at same time it contributes to proliferation of normal spleen cells in vitro. The repetitive pulsed microwaves with an intensity of 0.04-1.5 kW/cm^2 stimulated healing of skin wounds and ulcerations in mice. The effects showed a dependence on the pulse repetition rate and irradiation intensity. 展开更多
关键词 Repetitive pulsed microwaves nanosecond pulses biological effects.
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Influence of Unidirectional Tensile External-loading on Electromagnetic Property of the Perforated Frequency Selective Surface Illuminated by Electromagnetic Wave Incident at Arbitrary Angles
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作者 张立军 王德禹 +1 位作者 朱锡 张凌江 《Journal of Shanghai Jiaotong university(Science)》 EI 2010年第1期94-102,共9页
That whether unidirectional tension changes the influence of incident angle on FSS's(frequency selective surface) electromagnetic(EM) property and whether incident angle changes the effect of unidirectional intens... That whether unidirectional tension changes the influence of incident angle on FSS's(frequency selective surface) electromagnetic(EM) property and whether incident angle changes the effect of unidirectional intension on FSS's EM property is researched.The pattern and magnitude of these changes are revealed.Firstly,the analyses for the mechanism of unidirectional tension's influence and the mechanism of the coupling between the influences of unidirectional tension and incident angle are conducted.Then,according to the mechanism of these influences,Mechanics-Electromagnetics co-analysis is conducted based on mechanics finite element method and electromagnetics finite element method.The frequency responses of the FSS which is under different unidirectional tensions and illuminated by EM wave incident at different angles are gained.The concept"unidirectional tensile sensitivity of FSS"is put forward along with two unidirectional tensile sensitivity factors.By using angular sensitivity-factor and unidirectional tensile sensitivity-factor,the influences of unidirectional tension and incident angle,which are coupled with each other,are expatiated respectively.Research results show that these influences have two sides.Meanwhile,basing on Mode Matching Method and according to the results of numerical investigation,one principle for the layout of FSS with apertures is gained.Several suggestions for further research are given. 展开更多
关键词 frequency selective surface (FSS) radar absorbing structure unidirectional tensile sensitivity angular sensitivity mechanics-electromagnetics co-analysis composite ship integrated mast
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