为了研究开关电接点的机械抖动特性和测量机械抖动情况,研制了机械抖动测量系统。论述了测量系统的硬件设计和软件设计,给出了测量系统的电路原理图,以及关键程序源代码。对轻触按钮开关、复式按钮开关、单刀双掷开关的机械抖动次数进行了测量,测量结果表明:机械抖动次数是随机数,为0~625;对于复式按钮开关而言,前沿抖动次数明显小于后沿抖动次数。人们在操作按钮开关时,要迅速果断且用力要恰当,这样有助于减小机械抖动次数。

In order to study mechanical dithering feature of switch electric contact and measure the number of mechanical dither , we designed the measuring system of the mechanical dither .The article relates the design of hardware and software of the measuring system .Its circuit diagram as well as the key program source code has been put forward .The mechanical dithering number of nudging button , compound button SDPT switch has been measured , which shows that:the number of mechanical dither is a random digit in 0 to 625;for compound but-ton, front edge dithering number is less than back edge dithering number obviously .When pressing the button switch, people need to operate it quickly and decisively and force it appropriately , which helps to reduce the mechanical dithering number .

激光陀螺的输出信号中包涵外界输入角速度、机械抖动角速度两部分信息,而机械抖动角速度是一个叠加了一定噪声的标准正弦振动;在此提出了一种正弦抖动剥除技术,能极大地衰减激光陀螺输出信号中的正弦分量,实现对陀螺输出信号的初步解调,并采用FPGA作为实现工具;文章首先对激光陀螺输出信号特性进行了分析,提出了一种新型的抖动剥除技术的理论模型;然后具体介绍了这种技术在FPGA上的实现方法;最后利用基于本技术设计的FPGA+DSP系统对某型号激光陀螺进行了测试,通过观察证明本方法能很好地实现激光陀螺正弦抖动剥除,剥除后的激光陀螺正弦幅值能衰减到原始值的1/70。

In the output signal of laser gyro,there is not only containing the external input angular rate signal,but also the angular rate of dithered signal.The dithered signal is a standard sinusoidal vibration which superposes certain noises.This paper studies a sinusoidal dithered-stripping technology,which can greatly attenuate the sinusoidal component in the output signal of laser gyro,then realize the pri-mary demodulation.FPGA is the implemental tool in this paper,firstly article analyses the characteristics of laser gyro’s output signal,and propose a new type of dithered-stripping theoretical mode.Finally,according to this technology designed with the FPGA + DSP system , which has been tested for different laser gyros,this method can well realize the sinusoidal dithered-stripping technology and the sinusoidal’ amplitude can decay to the original value’1/70.

机载干涉SAR平台在飞行过程中通常会受气流、机械振动等因素的影响，造成柔性基线抖动，从而严重影响干涉 SAR 系统的性能。该文针对柔性基线机载干涉 SAR 系统中的基线抖动问题，首先推导了基线抖动下的斜距误差模型，然后从1次、2次和一般斜距误差建立了SAR复图像信号模型和双通道相关系数模型，并理论分析了基线抖动对SAR成像和干涉性能的影响。最后通过回波仿真实验验证了理论分析的正确性。

The airborne interferometric SAR platform suffers from instability factors, such as air turbulence and mechanical vibrations during flight. Such factors cause the oscillation of the flexible baseline, which leads to significant degradation of the performance of the interferometric SAR system. This study is concerned with the baseline oscillation. First, the error of the slant range model under baseline oscillation conditions is formulated. Then, the SAR complex image signal and dual-channel correlation coefficient are modeled based on the first-order, second-order, and generic slant range error. Subsequently, the impact of the baseline oscillation on the imaging and interferometric performance of the SAR system is analyzed. Finally, simulations of the echo data are used to validate the theoretical analysis of the baseline oscillation in the airborne interferometric SAR.

在口服液灯检机杂质检测系统中,口服液瓶体由于履带搓瓶的急停会有轻微的抖动,造成高速工业摄像机拍摄的前后两帧口服液瓶体图像中位于相同空间位置的像素无法重合在一起,导致前后两帧图像做差分结果出现错误。由于口服液中的杂质很小,一般会达到微米级别,因此机械的扰动以及口服液瓶体上的污点都有可能因位置偏差对检测结果造成影响。采用尺度不变特征检测(SIFT)对系统采集的前后两帧图像进行位置配准。SIFT算法稳定性精度很高,适用于高精度口服液杂质检测系统。基于抖动幅度微弱,对该算法进行了一定的改进与简化,以获得最佳配准结果。在实际检测过程中算法稳定,检测结果准确率很高。

In the light inspection machine system for oral liquid impurity detection, due to slight vibration of oral liquid bottle caused by sudden halt of crawler belt used for bottle spinning, in the sequential two pictures of oral liquid bottle cap-tured from high-speed industry camera, pixels sharing the same partial positions cannot be overlapped, which may lead to incorrect result after differential operation of the two pictures. For impurity in oral liquid is very small about micrometer level, mechanical dithering or dirt on the bottle of oral liquid shall pose influence on inspection accuracy because of afore-mentioned reason. This paper will harness SIFT algorithm to register the sequential two pictures. SIFT algorithm is suit-able for high accuracy oral liquid impurity detection system on account of its stability. It improves SITF a little in the aim of adapting to slight vibration range which will generate satisfactory result. In the real process of detection, the algorithm

针对双馈风力发电机工作环境恶劣，使用机械传感器进行速度和位置信号检测导致的故障率高、检修不便等问题，提出了一种基于双馈电机定子磁链的滑模M RA S转速估计器。方法是利用双馈电机定子磁链电压模型作为参考模型，利用双馈电机定子磁链电流模型作为自适应模型，利用两模型输出的叉积构造滑模面，并利用小信号模型分析了滑模存在和到达条件。同时，通过引入连续的饱和函数，解决了传统滑模观测器的高频抖动问题。最后，基于Matlab/SimuLink对提出的控制方法性能进行了验证。

Under the execrable operating environment ,the mechanical sensor for detecting the position and speed signals of the doubly-fed wind power generator leads to more faults and inconvenient maintenance . To solve the problem ,a stator flux-based sliding-mode model reference adaptive system (MRAS) speed estimator was proposed .In the proposed sliding-mode MRAS estimator ,the stator flux voltage model of the doubly-fed wind power generator was used to obtain the reference model and its current model as the adaptive model ,and a slide-mode surface was designed according to the two model output cross product , and the reaching conditions for the sliding mode were analyzed by using the small-signal model .Meanwhile the continuous saturation function is introduced to overcome the high frequency chattering problem .And the performances of the proposed control method were tested in Matlab/SimuLink .