| 高精度石英挠性加速度计闭环系统的设计与分析 |
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| 引用本文： | 刘润,蔡体菁,丁昊. 高精度石英挠性加速度计闭环系统的设计与分析[J]. 东南大学学报(自然科学版), 2010, 40(2). DOI: 10.3969/j.issn.1001-0505.2010.02.018 |
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| 作者姓名： | 刘润 蔡体菁 丁昊 |
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| 作者单位： | 东南大学微惯性仪表与先进导航技术教育部重点实验室,南京,210096;东南大学仪器科学与工程学院,南京,210096;南京航空航天大学工程训练中心,南京,210016;东南大学微惯性仪表与先进导航技术教育部重点实验室,南京,210096;东南大学仪器科学与工程学院,南京,210096 |
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| 基金项目： | 国家高技术研究发展计划(863计划)资助项目(2006AA12Z302) |
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| 摘 要： | 探讨了石英挠性加速度计的分辨率影响因素,提出了一种对现有石英挠性加速度计的改进设计.根据重力梯度测量对加速度计分辨率的要求,推导出摆片的固有频率,然后使用有限元方法重新设计加速度计的摆片结构.另外,为了降低加速度计的机械热噪声,对表头抽真空,通过加入比例-微分环节对加速度计的控制回路进行阻尼补偿.计算出系统的开环传递函数,并对其进行动态性能仿真分析.分析结果表明:加速度计系统通过在系统前向通道添加比例微分环节能够补偿系统的阻尼,消除加速度计在固有频率处的振荡,使加速度计闭环后处于临界阻尼状态并保持系统的稳定性.改进后加速度计的系统带宽为515Hz,响应时间为3.7m s,分辨率达到10-10g,能够满足高精度测量的需要.
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| 关 键 词： | 石英挠性加速度计 分辨率 重力梯度 |
Design and analysis of closed-loop system of high resolution flexure pendulum accelerometer |
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| Liu Run,, Cai Tijing, Ding Hao. Design and analysis of closed-loop system of high resolution flexure pendulum accelerometer[J]. Journal of Southeast University(Natural Science Edition), 2010, 40(2). DOI: 10.3969/j.issn.1001-0505.2010.02.018 |
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| Authors: | Liu Run Cai Tijing Ding Hao |
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| Affiliation: | 1Laboratory of Micro Inertial Instrument and Advanced Navigation Technology of Ministry of Education;Southeast University;Nanjing 210096;China;2School of Instrument Science and Engineering;China;3Engineer Training Center;Nanjing University of Aeronautics and Astronautics;Nanjing 210016;China |
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| Abstract: | The influential factors on the resolution of quartz-flexure accelerometer are analyzed.Modification design of the accelerometer is brought forward.The resonant frequency of pendulum is obtained according to the demand of accelerometer resolution in gravity gradient measurement.Then the structure of pendulum is redesigned by the finite element method.The mechanical Brownian noise is reduced greatly by evacuating the accelerometer.The damping of the accelerometer is increased by adding a damping compensator i... |
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| Keywords: | quartz-flexure accelerometer resolution gravity gradiometer |
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