激振频率是选择性激励红外热成像检测技术的控制参数。从结构共振的角度选取含微裂纹的混凝土简支梁作为激励对象,以简支梁自振频率作为激振频率,测试激励效果;并选用40 k Hz激振频率进行对比试验。试验结果显示,40 k Hz频率激振下的简...激振频率是选择性激励红外热成像检测技术的控制参数。从结构共振的角度选取含微裂纹的混凝土简支梁作为激励对象,以简支梁自振频率作为激振频率,测试激励效果;并选用40 k Hz激振频率进行对比试验。试验结果显示,40 k Hz频率激振下的简支梁出现了显著热激励效果,但自振频率未出现激励效果。结合这一试验现象,在机理层面计算分析了简支梁宏观整体振动、梁内细观质点波动两种振动状态对热激励效果的影响以及它们之间的相互作用规律。分析结果表明:在整个激励过程中,结构整体振动的热激励能力弱于质点波动,并持续消弱质点波动的强度;细观质点波动是热激励效果出现的原因,可选用40 k Hz超声频率激振来降低宏观整体振动强度,消除整体振动对质点波动的弱化作用。展开更多
0433.54 2003010095激光显微喇曼光谱对恐龙化石的研究=A Raman spectroscopicapproach to the dinosaur fossils from Chuxiong[刊,中]/杨群（楚雄师范学院物理系.云南,楚雄（675000））,王怡林…/光电子·激光.-2002,13（5）.-523...0433.54 2003010095激光显微喇曼光谱对恐龙化石的研究=A Raman spectroscopicapproach to the dinosaur fossils from Chuxiong[刊,中]/杨群（楚雄师范学院物理系.云南,楚雄（675000））,王怡林…/光电子·激光.-2002,13（5）.-523-526分析用激光显微喇曼光谱仪测试的楚雄州不同时期、不同地点的6个恐龙化石样品的喇曼谱,确定了其表面主要成分均为CaCO<sub>3</sub>。实验观察到284cm<sup>-1</sup>(CO<sub>3</sub><sup>2-</sup>的整体振动)谱峰的强度变化可能与年代相联系。实验结果为建立楚雄州恐龙化石喇曼光谱数据库提供了重要资料。图3表3参7（于晓光）展开更多
An improved whole model of beam pumping system was built. In the detail, for surface transmission system(STS), a new mathematical model was established considering the influence of some factors on the STS's torsio...An improved whole model of beam pumping system was built. In the detail, for surface transmission system(STS), a new mathematical model was established considering the influence of some factors on the STS's torsional vibration, such as the time variation characteristic of equivalent stiffness of belt and equivalent rotational inertia of crank. For the sucker rod string(SRS), an improved mathematical model was built considering the influence of some parameters on the SRS's longitudinal vibration, such as the nonlinear friction of plunger, hydraulic loss of pump and clearance leakage. The dynamic response and system efficiency of whole system were analyzed. The results show that there is a jumping phenomenon in the amplitude frequency curve, and the system efficiency is sensitive to motor power, pump diameter, stroke number, ratio of gas and oil, and submergence depth. The simulation results have important significance for improving the efficiency of beam pumping system.展开更多
文摘激振频率是选择性激励红外热成像检测技术的控制参数。从结构共振的角度选取含微裂纹的混凝土简支梁作为激励对象,以简支梁自振频率作为激振频率,测试激励效果;并选用40 k Hz激振频率进行对比试验。试验结果显示,40 k Hz频率激振下的简支梁出现了显著热激励效果,但自振频率未出现激励效果。结合这一试验现象,在机理层面计算分析了简支梁宏观整体振动、梁内细观质点波动两种振动状态对热激励效果的影响以及它们之间的相互作用规律。分析结果表明:在整个激励过程中,结构整体振动的热激励能力弱于质点波动,并持续消弱质点波动的强度;细观质点波动是热激励效果出现的原因,可选用40 k Hz超声频率激振来降低宏观整体振动强度,消除整体振动对质点波动的弱化作用。
文摘0433.54 2003010095激光显微喇曼光谱对恐龙化石的研究=A Raman spectroscopicapproach to the dinosaur fossils from Chuxiong[刊,中]/杨群（楚雄师范学院物理系.云南,楚雄（675000））,王怡林…/光电子·激光.-2002,13（5）.-523-526分析用激光显微喇曼光谱仪测试的楚雄州不同时期、不同地点的6个恐龙化石样品的喇曼谱,确定了其表面主要成分均为CaCO<sub>3</sub>。实验观察到284cm<sup>-1</sup>(CO<sub>3</sub><sup>2-</sup>的整体振动)谱峰的强度变化可能与年代相联系。实验结果为建立楚雄州恐龙化石喇曼光谱数据库提供了重要资料。图3表3参7（于晓光）
基金Projects(50974108,51174175) supported by the National Natural Science Foundation of China
文摘An improved whole model of beam pumping system was built. In the detail, for surface transmission system(STS), a new mathematical model was established considering the influence of some factors on the STS's torsional vibration, such as the time variation characteristic of equivalent stiffness of belt and equivalent rotational inertia of crank. For the sucker rod string(SRS), an improved mathematical model was built considering the influence of some parameters on the SRS's longitudinal vibration, such as the nonlinear friction of plunger, hydraulic loss of pump and clearance leakage. The dynamic response and system efficiency of whole system were analyzed. The results show that there is a jumping phenomenon in the amplitude frequency curve, and the system efficiency is sensitive to motor power, pump diameter, stroke number, ratio of gas and oil, and submergence depth. The simulation results have important significance for improving the efficiency of beam pumping system.
