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基于小波神经网络的船舶冷却水系统的传感器故障诊断   总被引:1,自引:1,他引:0  
船舶冷却水系统是保证船舶动力装置安全可靠运行的系统之一,是故障诊断系统的重要组成部分,具有十分重要的工程意义.以船舶冷却水系统传感器故障检测问题为目标,提出了基于小波神经网络预测器的传感器故障诊断方法.该方法避免了神经网络结构设计上的盲目性及训练过程易陷入局部最小等问题,同时采用同伦算法优化网络,解决小波神经网络对初始值敏感的问题.采集大连海事大学实验船的传感器数据,以温度传感器为例,对1℃偏差故障、0.03℃/s速率漂移故障及不同方差下的精度等级下降故障进行了仿真,结果表明同伦小波网络的诊断率高达95%,证明了该方法的有效性.  相似文献
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We describe a homotopy algorithm for the computation of equilibriain Stochastic Finance Economies. The algorithm solves a nonlinearsystem of equations consisting of the first-order conditions of theagents' utility maximization problems and market-clearing conditions.Moreover, we discuss the use of a straightforward homotopy approach for localcomparative statics. Using our methods we evaluate price, volatility,and welfare effects of options in incomplete asset markets.  相似文献
3.
Results are reported for a series of experiments involving numerical curve tracking on a shared-memory parallel computer. Several algorithms exist for finding zeros or fixed points of nonlinear systems of equations that are globally convergent for almost all starting points, that is, with probability one. The essence of all such algorithms is the construction of an appropriate homotopy map and then the tracking of some smooth curve in the zero set of this homotopy map. HOMPACK is a mathematical software package implementing globally convergent homotopy algorithms with three different techniques for tracking a homotopy zero curve, and has separate routines for dense and sparse Jacobian matrices. The HOMPACK algorithms for sparse Jacobian matrices use a preconditioned conjugate gradient algorithm for the computation of the kernel of the homotopy Jacobian matrix, a required linear algebra step for homotopy curve tracking. A parallel version of HOMPACK is implemented on a shared-memory parallel computer with various levels and degrees of parallelism (e.g., linear algebra, function, and Jacobian matrix evaluation), and a detailed study is presented for each of these levels with respect to the speedup in execution time obtained with the parallelism, the time spent implementing the parallel code, and the extra memory allocated by the parallel algorithm.  相似文献
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In this paper, a constraint set swelling homotopy (CSSH) algorithm for solving the single-level non-convex programming problem with designing piecewise linear contractual function which is equivalent to the principal-agent model with integral operator is proposed, and the existence and global convergence is proven under some mild conditions. As a comparison, a piecewise constant contract is also designed for solving the single-level non-convex programming problem with the corresponding discrete distributions. And some numerical tests are done by the proposed homotopy algorithm as well as by using fmincon in Matlab, LOQO and MINOS. The numerical results show that the CSSH algorithm is robust, feasible and effective.  相似文献
5.
胡晖 《计算机与应用化学》2007,24(12):1677-1680
石油化工及其深加工中经常涉及三相精馏过程,模拟该过程对化工分离设计具有十分重要的意义。文中提出一种新算法Newton同伦-同时校正混合法模拟三相精馏过程,该算法将同时校正法有机地嵌入同伦法中,采用同伦弧长微分法求解,在保持同伦算法大范围收敛特性的同时,提高了计算效率。采用Michlesen稳定性判据作为液相稳定性判据。以丙烯腈-乙腈三相萃取精馏塔为例,验证了算法的有效性。  相似文献
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本文在集成控制的框架下研究了工业过程中产品质量和生产过程的实时一体控制问题.首先,基于双速率采样数据提出了产品质量和生产过程的集成控制方案.然后,把控制器设计问题归结为求解一组非线性矩阵不定式,进而提出基于同伦算法的控制器设计方法.最后,通过数值仿真说明所提方法的有效.  相似文献
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