In order to find out the influence of the instability of angular velocity of the rotating carrier itself on the stability of silicon micromachined gyroscope, the digital models for relative error of the high and low d...In order to find out the influence of the instability of angular velocity of the rotating carrier itself on the stability of silicon micromachined gyroscope, the digital models for relative error of the high and low damping gyroscope's output signal are given respectively, based on the motion equations of the silicon micromachined gyroscope. Theory proves that the output signal error of the silicon micromachined sensor is mainly caused by the instability of damping factor and the angular velocity of the rotating carrier itself. The experiment result indicates that the error of proportionality coefficient of output voltage which is caused by the instability of the angular velocity of the rotating carrier itself reaches to 4.1 %. Theoretical demonstration and experimental verification show that the instability of angular velocity of the rotating carrier itself has an important effect on the stability of low damping silicon micromachined gyroscope.展开更多
文摘目的:评估机械性踝关节不稳(mechanical ankle instability,MAI)患者是否存在动态稳定性下降的缺陷,为此类患者的治疗策略提供依据。方法:42名测试对象纳入本研究,其中23名为机械性踝关节不稳患者(A组),19名健康对照人群(B组)。每名测试对象均在平衡测试训练仪(Neuro Com Balance Manager)上进行运动控制测试(motor control test,MCT),评估其在突发外源干扰时迅速恢复平衡的能力。采用重心对称评分(weight symmetry,WS)和潜伏期评分(latency score,LS)对受试者动态稳定能力进行评估。结果:两组间在性别、年龄、身高、体重方面差异无统计学意义(P>0.05)。MAI患者在所有后向摆动及前向小幅摆动WS均高于对照组,差异具有统计学意义(P<0.05),表明MAI患者利用患侧肢体来维持重心的能力明显下降。两组间LS在前、后摆动状态下差异均未见统计学意义。组内比较,患侧与健侧在前、后摆动状态下LS差异也未见统计学意义(P>0.05)。结论:机械性踝关节不稳患者存在动态平衡功能异常,利用患侧肢体来维持身体重心的能力下降。在临床治疗中,应当注意这些异常,并进行针对性康复训练。
基金The author would like to thank the Nature Science Foundation of China (Grant No.60627001)the Beijing Key Laboratory for Sensor(No.KM200810772001)
文摘In order to find out the influence of the instability of angular velocity of the rotating carrier itself on the stability of silicon micromachined gyroscope, the digital models for relative error of the high and low damping gyroscope's output signal are given respectively, based on the motion equations of the silicon micromachined gyroscope. Theory proves that the output signal error of the silicon micromachined sensor is mainly caused by the instability of damping factor and the angular velocity of the rotating carrier itself. The experiment result indicates that the error of proportionality coefficient of output voltage which is caused by the instability of the angular velocity of the rotating carrier itself reaches to 4.1 %. Theoretical demonstration and experimental verification show that the instability of angular velocity of the rotating carrier itself has an important effect on the stability of low damping silicon micromachined gyroscope.
