共查询到19条相似文献,搜索用时 171 毫秒
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谐振式微机械加速度计设计的关键技术 总被引:1,自引:0,他引:1
谐振式微机械加速度计直接输出频率信号,具有稳定性好、精度高的特点.分析了谐振式微机械加速度计的工作机理,建立了第一级敏感结构、杠杆机构和第二级敏感结构的数学模型,指出了实现高灵敏度加速度测量的关键技术在于支撑梁、质量块、谐振器和杠杆机构的设计.提出了一种谐振式微机械加速度计结构,进行了结构的优化设计和仿真计算,得出的性能指标:谐振频率98 858 Hz,Q值673.9,灵敏度24.52 Hz/gn. 相似文献
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硅基谐振式微机械加速度计的设计与仿真计算 总被引:1,自引:0,他引:1
分析了硅基谐振式微机械加速度计的工作机理,提出了一种新颖的结构形式,进行了结构的优化设计和仿真计算.用MATLAB软件分析了结构参数对性能指标的影响,用ISIGHT优化软件优化出结构参数,用ANSYS仿真软件对结构进行了静态分析和模态分析,验证了所提出结构的设计思想和优化参数的可行性. 相似文献
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电容式微加速度计的噪声分析 总被引:1,自引:1,他引:0
噪声是以微弱信号处理为特征的电容式微加速度计性能提高的主要制约因素。针对电容式微加速度计的噪声,详细分析和研究了其特性。首先分析了电容式微加速度计的系统噪声由机械热噪声和电路噪声两部分组成;采用热力学均分理论和集成电路噪声特性分别对机械热噪声和电路噪声进行建模、分析和计算,得到了机械热噪声等效噪声加速度和各级电路的噪声值。然后用自行设计的微加速度计表头和接口电路进行试验,实验结果验证了噪声模型的正确性,确认了电容式微加速度计电容检测电路—电荷放大器是最主要的噪声源。 相似文献
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微机械电容式加速度计的基本参数如固有频率、非线性度、分辨率等首先取决于其本身的结构,因此加速度计结构的设计选取至关重要。本文首先综合比较了微机械电容式加速度计的三种常见结构三明治摆式、翘翘板摆式和梳齿式的各自特点,指出了定齿偏置结构的梳齿式微机械加速度计的优点。并以该结构为分析对象,从加速度计的分辨率、量程、稳定性、灵敏度等性能分析比较了多种结构梁,提出了折叠梁的综合性能最好,最后通过分析计算出了折叠梁在检测方向的刚度。 相似文献
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I. M. Anan’evskii T. A. Ishkhanyan 《Journal of Computer and Systems Sciences International》2016,55(3):483-491
Control of an electromechanical system consisting of two rigid bodies connected by an electric motor is considered. Both bodies can rotate about a common axis. This system is a simplified model of a precision turntable mounted on an orbital space vehicle and designed to reduce the apparent accelerations of a container with a payload fixed on the turntable. The accelerations to be reduced are small and may be comparable with the accelerations caused by the friction in the bearings of the electric drive. A feedback control law is proposed, which, after finite time interval, provides a predetermined motion of the second body relative to the first one in the presence of friction with unknown and variable parameters and in the presence of other uncontrollable perturbations. The effectiveness of the suggested control law is illustrated by numerical simulations. 相似文献
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We investigated whether potential differences in head inclinations and accelerations for two highly similar computer work tasks could be detected using (1) a triaxial accelerometer and (2) a simulated uniaxial accelerometer.Ten subjects’ head movements were registered with a triaxial accelerometer system for two similar document-management tasks at their work place: a fully electronic document-management task and one also involving paper documents.In situations where head movements were small, a triaxial accelerometer was able to discriminate between the different degrees of static work of the neck in terms of range of head inclinations and accelerations. A difference in head acceleration was also found by using a simulated uniaxial accelerometer. Thus, in terms of head movement and for work similar to this office work, potential dynamic differences in observationally similar work tasks can be investigated by using a triaxial accelerometer. For acceleration alone, a uniaxial accelerometer can also be used. 相似文献
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A simple plane frame model is described for the lateral load analysis—static and dynamic—of frames in multistory buildings including biaxial load effects. By taking advantage of the shear force-axial force and the torque-bending moment analogies it is possible to model the spatial behavior of the structure, and to consider the combined effects of bidirectional shear due to lateral and torsional displacements on columns pertaining to two orthogonal frames. A numerical example is given. 相似文献
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In this the paper, the problem of mitigating the seismic response of sensitive equipments housed in building structures is addressed by isolating the structure with an innovative device referred to as roll-n-cage isolator. The device is described, characterized and represented by a hysteretic semi-physical mathematical model. A numerical performance assessment is performed by implementing the isolator in a building structure housing equipment in upper floors where accelerations are amplified and motions contain strong components at long periods. The numerical results show that the proposed isolator is efficient in substantially attenuating the structure–equipment response under a wide variety of actual earthquakes while exhibiting robust performance for a wide range of structures. 相似文献