一种数字式静电陀螺仪测角系统

该文就静电陀螺仪对极轴位置分辨率和稳定性的高要求 ,研究了一种数字式测角系统。这一系统基于球形转子赤道面上的锯齿图谱 ,采用光学传感器拾取信号 ,通过信号处理电路 ,将转子的极轴位置信号转换为数字脉冲信号的数字式测角系统。文中探讨了此数字式测角系统的方案 ,介绍了新研制的信号处理电路 ,并进行了测角试验 ,给出了系统精度。     

Capacitance Sensing and Software-Realized Lock-in Amplifier for the Electromagnetically Levitated Micro Gyroscope

In the novel prototype of micro-gyroscope structure,the new configured capacitance sensing scheme for the micro gyroscope was analyzed and the virtual instrument based detection scheme was implemented.The digital lock-in amplifier was employed in the capacitance detection to restrain the noise interference.The capacitance analysis shows that 1 fF capacitance variation corresponds to 0.1 degree of the turn angle.The differential capacitance bridge and the charge integral amplifier were used as the front signal input interface.In the implementation of digital lock-in amplifier,a new routine which warranted the exactly matching of the reference phase to signal phase was proposed.The result of the experiment shows that digital lock-in amplifier can greatly eliminate the noise in the output signal.The non linearity of the turn angle output is 2.3% and the minimum resolution of turn angle is 0.04 degrees.The application of the software demodulation in the signal detection of micro-electro-mechanical-system(MEMS)device is a new attempt,and it shows the prospective for a high-performance application.     

A Statistical Parameter Analysis and SVM Based Fault Diagnosis Strategy for Dynamically Tuned Gyroscopes

Gyro's fault diagnosis plays a critical role in inertia navigation systems for higher reliability and precision. A new fault diagnosis strategy based on the statistical parameter analysis (SPA) and support vector machine (SVM) classification model was proposed for dynamically tuned gyroscopes (DTG). The SPA, a kind of time domain analysis approach, was introduced to compute a set of statistical parameters of vibration signal as the state features of DTG, with which the SVM model, a novel learning machine based on statistical learning theory (SLT), was applied and constructed to train and identify the working state of DTG. The experimental results verify that the proposed diagnostic strategy can simply and effectively extract the state features of DTG, and it outperforms the radial-basis function (RBF) neural network based diagnostic method and can more reliably and accurately diagnose the working state of DTG.     

基于单轴陀螺平台的摆式列车倾摆检测系统

提出了基于单纯陀螺平台的摆式列车检测系统，详细分析了单纯陀螺平台系统的工作原理有其在摆式列车检测中的应用。对平台系统进行的分析表明，陀螺仪的漂移和国速度计的零偏是影响平台系统工作精度的主要误差因素。     

T360G大角速率动力调谐陀螺仪性能实现的机理

介绍一种国内新型动力调谐陀螺仪。陀螺仪实现最大可感角速率达到4000/s(可持续4s)以上,可承受的冲击大于200g,电机启动快,可在3s内达到稳定的调谐转速的性能。满足大机动运载器用捷联惯导系统的要求。其采用的特殊支承及单力矩器结构,为提高陀螺加矩速率开阔了新的技术途径。     

面向舰船应用的光纤陀螺工程化关键技术

光纤陀螺在国内已经进入高速发展时期,其面向舰船的应用也越来越受人瞩目.在高精度光纤陀螺工程化过程中,目前若干关键性技术仍未获得突破.本文介绍了光纤陀螺的基本原理,着重对干涉式光纤陀螺的结构和工作原理进行了说明;介绍了光纤陀螺国内外最新发展水平,以及在舰船上的应用情况;对高精度光纤陀螺工程化过程中所遇到的2项关键技术,即光纤陀螺长期温度稳定性技术和抗振技术进行了分析,并结合多年的实验经验,提出了具有实际参考意义的解决途径和措施.     

OPTIMUM PARAMETERS AND DESIGN OF TUNED MASS DAMPER FOR BUILDING FRAMES UNDER GROUND ACCELERATION

IntroductionTuned mass damper(TMD) was proposed byOrmondroyd and Den Hartog[1] and was studied bymany researchers[2～ 7] .TMD is effective in reduc-ing the wind- induced response of structures.Fur-thermore,TMDs have been successfully installedin many actual building such as the2 4 4 m highJohn hancock tower and the 2 80 m high Citicorpcenter office building in the mitigation of the wind-induced excessive vibration.For seismic applica-tions,however,there has not been a generalagreementon …     

硅微陀螺仪数字化温度补偿系统的实现

分析了温度影响陀螺零偏的机理,由温度实验得出硅微陀螺仪零偏与温度呈较复杂的非线性关系;根据实验数据拟合出零偏与温度在三个温度段内的数学表达式;设计了相应的温度补偿系统,该系统以新华龙C8051F363单片机为核心,根据实时测量的温度值经由拟合的多项式计算出各温度下的补偿值,将陀螺原始信号减去补偿值即可得到补偿后的陀螺信号.经温控实验测定,在-40℃-80℃的范围内,补偿后陀螺零偏随温度变化的趋势项基本被消除,且陀螺零偏减小了一个数量级,补偿效果明显.     

Periods and energy dissipations of a novel TLD rectangular tank with angle-adjustable baffles

A novel tuned liquid damper (TLD) rectangular tank with two angle-adjustable baffles was presented. The numerical analysis was performed using the commercial code FLUENT. The standard kinetic energy and dissipation rate turbulent model was employed, which was solved using volume of fluid (VOF) method able to treat both the free surface motion and the viscous stresses over the rigid walls accurately. The relationship between the natural periods of water and the angles of its baffles was studied by numerical sim- ulating of a case, and the changes of energy dissipations were investigated. The natural periods and dampers of the novel TLD can be changed in a wide range by adjusting the baffles' angle, thus it is more effective in controlling the vibration of structures in a wide frequency range.     

船用光纤陀螺动态建模方法研究

提出了一种基于沃尔什函数(Walsh)的船用光纤陀螺动态建模方法,引入沃尔什函数可直接由光纤陀螺的时域动态标定数据得出其动态模型微分方程或连续传递函数的系数．文章有效解决了沃尔什矩阵的产生、沃尔什变换时信号采样点的选取等问题．仿真及实测数据的研究表明,该方法获得了良好的建模效果,可以应用于建立光纤陀螺的动态模型．