针对等直径转轴动态扭矩测试方法计算模型和测量装置复杂以及测试范围受限等问题，提出了一种基于DASP的光电反射式动态扭矩测试方法。建立由光电反射式传感器和DASP系统等组成的动态扭矩测试系统，利用传感器光电脉冲信号的时差和相对转角，来实现动态扭矩测量。实测结果表明，通过调整传感器的位置，就可以实时、精确地实现扭矩的非接触式测量。这种测试方法为转轴的扭矩测试提供了一种新的技术途径。

Aiming at the problems of complex computation model, complex measurement equipment and test range limitation in dynamic torque testing of uniform-diameter rotating shafts, a dynamic torque testing method based on DASP and photoelectric reflex sensors was proposed. A dynamic torque testing system including photoelectric reflex sensors and dynamic data information collection equipment was established. Using the time difference of photoelectric sensor’s pulse signal and the relative angle, the dynamic torques could be measured. Experimental results show that real-time and accurate non-contact measurement of the dynamic torques can be realized through adjusting the sensor’s positions. This technology has provided a new method to test the dynamic torques of rotating shafts. This method is applicable to all kinds of large shaft dynamic torque measurements.

介绍两跨连续梁不同跨径比对振型的影响,并讨论冲击系数的取值。采用槽型梁作为连续梁模型,利用Midas有限元分析软件和DASP设备分别对连续梁进行模态分析,得出不同跨径比下连续梁的前3阶振型及其频率,并将Midas计算结果与试验结果进行对比,证实振型变化的真实性。结果表明,第2、3阶振型随着跨径比减小会出现转折,中支点振型的曲率发生变化;考虑跨中正弯矩效应时,冲击系数宜按照《桥规》采用基频计算;考虑中支点负弯矩效应时,冲击系数应采用第二或第3阶频率计算。

Influence of the span ratio of a two-unequal-span continuous beam on vibration mode is introduced, and the option of impact factor values is discussed. Using a channel-shaped continuous beam as the model, the finite element analysis code of Midas and the equipment of DASP are respectively employed for modal analysis, and the first three modals and frequencies of the continuous beam with different span ratios are obtained. Results of the analyses are compared with those of testing, and the vibration mode change is confirmed. The results demonstrate that (1) with the decreasing of the span ratio, the turning points of the 2nd and 3rd order modals may appear and the curvature of the vibration mode at the mid support will change greatly;(2) when the effect of positive bending moment at the mid-point of the span is considered, the impact factor should be calculated according to the fundamental frequencies shown in the standard of bridge construction;(3) when the effect of negative bending m