The invention discloses a ship propeller shaft thrust high-precision real-time identification method and device. The method comprises the following steps that a measuring device is machined and installed on a rotating shaft; acquiring longitudinal strain and environment temperature of the measuring device, and constructing a first equation of thrust, temperature and strain; deriving the first equation and discretizing according to time to obtain a second equation, and obtaining a system matrix equation and an observation equation based on the second equation; thrust state prediction of the kth time step is completed based on the matrix equation, and thrust state estimation is completed based on the observation equation; and recurring the time to the (k + 1) th time step, repeating state prediction and state estimation, and finally obtaining a thrust dynamic process. The method has high anti-interference capability, thermal deformation errors caused by environment temperature changes can be compensated, and high measurement precision can be kept in strong interference noise. In addition, the strain gauge is attached to the measuring device, the sensitivity coefficient of the strain gauge can be calibrated in a laboratory, and therefore influences of external factors such as the strain gauge attaching mode and the glue type are eliminated.
本发明公开了一种船舶螺旋桨轴推力高精度实时辨识方法与装置,包括如下步骤:加工测量装置并安装在转轴上;获取测量装置纵向应变及环境温度,构建推力、温度与应变的第一等式;对第一等式求导并按时间离散得到第二等式,基于第二等式得到系统矩阵方程与观测方程;基于矩阵方程完成第k个时间步推力状态预测,基于观测方程完成推力状态估计;将时间递推至第k+1个时间步,重复状态预测与状态估计,最终获得推力动态过程。本发明具有较强抗干扰能力,可补偿环境温度变化引起的热变形误差,能在强干扰噪声中保持较高测量精度。此外,本发明中应变片贴在测量装置上,可在实验室中标定应变片灵敏度系数,从而消除应变片粘贴方式、胶水种类等外因影响。
Ship propeller shaft thrust high-precision real-time identification method and device
一种船舶螺旋桨轴推力高精度实时辨识方法及装置
2023-01-24
Patent
Elektronische Ressource
Chinesisch