气流式水平姿态传感器的敏感机理  

Sensitive mechanism of airflow level posture sensor

作　　者：朴林华[1] 李言杰[1] 李白华[1] 

机构地区：[1]北京信息科技大学北京市传感器重点实验室,北京100101

出　　处：《东南大学学报（自然科学版）》2009年第S1期244-247,共4页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金资助项目(60772012);新世纪优秀人才支持计划(NCET)资助项目;北京市优秀人才培养资助项目;北京市重点实验室开放课题资助项目;北京市属高校人才强教计划资助项目

摘　　要：解释了气流式水平姿态传感器的敏感机理.采用有限元方法,利用ANSYS-FLOTRANCFD软件,通过建模、划分网格、加载和求解等途径,计算了在不同倾斜状态下二维密闭腔中两点热源引起的对流场.计算结果表明:两热源处的气流速度之差随着倾斜角度的变化而改变,倾斜角度加大,气流速度之差也增加.在水平状态时两热源处的气流速度相等,两热电阻丝上的电流相等,电桥电路输出为零;在倾斜状态下时,两热源处的气流速度之差随着倾斜角度而变化,引起两热电阻丝上电流之差也随之变化,电桥输出一个对应于倾斜角度的电压.有限元计算方法为气流式水平姿态传感器的优化设计开辟了有效的研究途径.The sensitive mechanism of airflow level posture sensor is explained by finite element method.The stream field by two points heat source,when the two-dimensional enclosure is inclined,is obtained by a series of procedure such as model building,meshing,loads applying and equation solving.In the process ANSYS-FLOTRAN CFD program is applied.The numerical results show that the velocity difference of airflow at two points heat source changes with the tilt angle;the difference between airflow velocity increases with the increase of the tilt angle.In horizontal status,the velocities of airflow at two points heat source are equal,so the currents of both hot wires are also equal.The output of the bridge circuit is zero.In tilting status,the velocity difference of airflow at two points heat source changes with the tilt angle,leading to change of the current difference of both hot wires;the bridge outputs a voltage signal corresponding to the tilt angle.This calculation method provides a new way for optimization of airflow level posture sensor.

关 键 词：有限元法 气体摆 对流场 敏感机理 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]