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针对船舶动力定位状态估计时使用扩展卡尔曼滤波导致模型失配而产生滤波精度不高甚至滤波发散的问题,设计一种融合无迹卡尔曼滤波和粒子滤波的动力定位船舶状态估计算法.该算法以粒子滤波作为整体框架,运用无迹卡尔曼滤波对粒子状态的每次更新进行最优化估计,从而最优化了每个粒子的状态,再根据每个粒子的重要性分布,得出船舶复合运动中的低频状态.Matlab仿真结果表明,该方法能够从含有高频和噪声干扰的测量信息中估计出的船舶低频运动状态,相比于直接使用UKF,该方法的滤波精度更高,滤波性能也比较稳定. 相似文献
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船舶动力定位系统已广泛应用于海洋工程中,状态估计是动力定位系统的重要组成部分。在工程应用中,状态估计方法主要采用基于卡尔曼滤波的算法,但是这些算法对于船舶首向的滤波效果并不理想。alphabeta滤波是一种不基于模型的稳定常增益滤波器,其结构与卡尔曼滤波类似。本文设计了一种混合滤波器,采用alpha-beta滤波对船舶首向进行滤波,扩展卡尔曼滤波对船舶横向和纵向进行滤波,以改善船舶首向的滤波效果。通过将混合滤波器的滤波效果与扩展卡尔曼滤波器进行对比,验证了alpha-beta滤波用于船舶首向滤波的可行性和有效性。 相似文献
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针对噪声干扰条件下传统的扩展卡尔曼滤波方法在电力系统频率和谐波估计精度问题,本文提出了基于复数无迹卡尔曼滤波的频率和谐波估计方法.利用欧拉公式,对电力系统信号进行适当变换,获得电力系统信号复数状态空间模型,实现了系统信号频率和谐波估计.为了验证噪声干扰条件下本文方法参数估计有效性,通过在系统信号中增加不同信噪比噪声干扰,分别利用本文方法和通用扩展卡尔曼滤波方法对参数进行估计.结果表明,在噪声干扰条件下,本文方法的估计精度优于通用扩展卡尔曼滤波方法,这表明本文方法更适于强噪声干扰条件下的系统信号频率和谐波估计. 相似文献
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在动力定位系统对风和流的作用力进行前馈控制的基础上,将卡尔曼滤波的状态估计方法运用于估算船舶低频运动信号,提出一种基于专家经验的模型预测控制算法.为检验该算法的控制精度和控制稳定性等技术指标,结合目标船的实际情况,对动力定位系统的水池试验进行了设计.不同模拟环境下的试验结果表明,该控制算法能够满足目标船对动力定位控制系统的技术要求,具有良好的控制精度和稳定性. 相似文献
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针对2 000 t回转起重船定位及SRI-VC2110DP动力定位系统的需求,在建立回转起重船数学模型的基础上,提出2种动力定位系统预测控制策略。该控制策略在风和流的前馈控制基础上,采用基于卡尔曼滤波的状态估计方法用于估算船舶低频运动信号。仿真结果表明,所提出的方法能够有效的对船舶进行动力定位控制。 相似文献
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It is essential for a safe and cost-efficient marine operation to improve the knowledge about the real-time onboard vessel conditions. This paper proposes a novel algorithm for simultaneous tuning of important vessel seakeeping model parameters and sea state characteristics based on onboard vessel motion measurements and available wave data. The proposed algorithm is fundamentally based on the unscented transformation and inspired by the scaled unscented Kalman filter, which is very computationally efficient for large dimensional and nonlinear problems. The algorithm is demonstrated by case studies based on numerical simulations, considering realistic sensor noises and wave data uncertainties. Both long-crested and short-crested wave conditions are considered in the case studies. The system state of the proposed tuning framework consists of a vessel state vector and a sea state vector. The tuning results reasonably approach the true values of the considered uncertain vessel parameters and sea state characteristics, with reduced uncertainties. The quantification of the system state uncertainties helps to close a critical gap towards achieving reliability-based marine operations. 相似文献
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《船舶与海洋工程学报》2019,(4)
Monitoring and evaluating the health parameters of marine gas turbine engine help in developing predictive control techniques and maintenance schedules. Because the health parameters are unmeasurable, researchers estimate them only based on the available measurement parameters. Kalman filter-based approaches are the most commonly used estimation approaches; however, the conventional Kalman filter-based approaches have a poor robustness to the model uncertainty, and their ability to track the mutation condition is influenced by historical data. Therefore, in this paper, an improved Kalman filter-based algorithm called the strong tracking extended Kalman filter(STEKF) approach is proposed to estimate the gas turbine health parameters. The analytical expressions of Jacobian matrixes are deduced by non-equilibrium point analytical linearization to address the problem of the conventional approaches. The proposed approach was used to estimate the health parameters of a two-shaft marine gas turbine engine in the simulation environment and was compared with the extended Kalman filter(EKF) and the unscented Kalman filter(UKF). The results show that the STEKF approach not only has a computation cost similar to that of the EKF approach but also outperforms the EKF approach when the health parameters change abruptly and the noise mean value is not zero. 相似文献
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在处理目标跟踪等动态系统实时估计问题中,通常采用EKF作为状态估计方法提高估计精度。由于EKF进行非线性估计存在一些缺陷,将系统进行线性化近似存在估计误差,从而影响目标跟踪的精度。为了获得更高的估计精度,介绍了几种非线性滤波算法,包括unscented卡尔曼滤波算法、简单粒子滤波算法以及无味粒子滤波算法(UPF)。分析了这几种算法的原理和实现,对各种算法的适应性进行了比较。通过目标跟踪仿真实验,表明UKF、PF较EKF估计精度和收敛速度有所提高。 相似文献
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研究了无味粒子滤波器的基本思想和具体算法实现步骤,在给出的闪烁噪声统计模型基础上,将PF、UKF和UPF算法应用在雷达目标跟踪中,解决了闪烁噪声情况下的雷达目标跟踪问题,仿真结果表明,UPF的状态估计性能优越。 相似文献
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This paper mainly focuses on the heading control of a position-moored vessel operating under level ice regime. A dynamic ice simulator interconnecting the vessel motions with the ice dynamics is used for the design of the heading control system. The strategy is to ensure that the vessel is kept at an appropriate position within the safe limits. Using a heading controller based on a Kalman filter, the desired control force is computed to counteract the environmental disturbances. A thrust allocation method is developed to go with the heading controller. To keep the ice forces to a reasonable level, the moored vessel should be aligned with the ice drift direction and small angles up to 15° in changes on heading against the ice flow could be possible. Therefore, heading control of a moored vessel exposed to level ice with drift angle 0° and 15° is simulated since the dynamic positioning system needs to resist ice yaw moments and lateral ice forces on the hull. The simulation indicates that the proposed control strategy performs satisfactorily for a moored vessel in level ice. 相似文献