移相法在H半桥型励磁电流开关功放中的应用

本文提出采用两路占空比相同但具有一定相位差的PWM控制方法,可以在不影响响应速度的情况下减小电流纹波。分析了H半桥型励磁功放工作原理,给出了0~180°移相的电流纹波统一计算公式。以应用的开关功放为例,进行大量的仿真和实验,结果表明了上述理论分析和纹波计算公式的正确性。该方法简单有效,具有一定的应用价值。     

机械自动变速器换挡冲击对策研究

针对电控机械自动变速器系统在试验过程中产生换挡冲击、同步器异常磨损等问题展开研究,通过分析具体换挡工作过程及机理,提出了消除换挡冲击的控制方法并实车进行验证。实验结果表明,该方法能有效避免换挡冲击并延长同步器使用寿命。     

DCT直线型换挡动力学仿真（续1）

为了使汽车冲击度和离合器滑摩功能够满足换挡品质的要求,文章对装有双离合器自动变速器（DCT）的汽车进行了动力学仿真分析,建立其变速器动力传动系统模型。并针对变速器直线型换挡过程中冲击度和滑摩功难以同时达到最优的问题,采用遗传算法对离合器油压值进行优化控制,获得油压-时间的最优控制曲线,将优化后的控制曲线代入仿真模型,结果表明,冲击度和滑摩功均达到较为理想的状态。     

20.5万吨散货船轴带发电机系统设计研究

为降低大型商业运输船舶无限航区航行时能源消耗,在20.5万吨级大型散货船上采用PWM型轴带发电机,以降低运输成本,提高环保性能,提高经济效益。     

浮式抗冰平台设计理念及水动力特性研究

钻探极地地区近海石油和天然气资源对移动式离岸钻井平台的水动力性能、抗冰性能和作业性能有着极大的要求。本文主要介绍了浮式抗冰平台的设计方案,并结合当今最新一款半潜式抗冰平台的设计理念,分别从频域和时域分析的角度与传统的半潜式平台作对比,分析得出其具有优越的水动力性能,垂荡、横摇、纵摇运动响应都优于传统的半潜平台,为下一步抗冰性能分析及其关键技术的研究做基础,同时也给半潜式平台带来新的设计理念,为浮式抗冰平台的设计建造提供合理思路。     

船舶制冷控制系统的模型研究

主要研究采用变频调速控制的船舶制冷系统的数学模型，其中也介绍了以温度控制和节能为目标的优化控制思路及系统的简单构成。     

广州地铁动车组三相辅助电源用十二脉冲逆变器

介绍了十二脉冲逆变器的基本电路结构，论述了其控制原理，阐述了电压均衡和谐波消除问题，运用表明，该十二脉冲逆变器具有低开关频率，优良的正弦波输出，高抗干扰性等特点。     

Monitoring of suction bucket jackets for offshore wind turbines: Dynamic load bearing behaviour and modelling

Suction bucket foundations for offshore wind turbines (OWT) have considerable advantages compared to conventional foundation types: Due to the installation process with dead weight and applied negative pressure, noise from pile driving can be completely avoided. In addition, the installation process of the whole substructure, consisting of the buckets connected to the jacket, can be carried out in one work step, which increases efficiency. A prototype of the suction bucket jacket was installed in the wind park ‘Borkum Riffgrund 1’ (North Sea) in August 2014. Due to the pre-installed and comprehensive measuring system, it was possible to monitor all installation and operating phases. The data analysis of a storm event show an amplitude and frequency-dependent behaviour of the soil stiffness and the suction bucket foundation without wind turbine. In the frequency range of the first and second eigenfrequency (0.2 Hz < f < 5 Hz), the system behaves linearly. Here, the Frequency Domain Decomposition is used for identification and monitoring. For the lower frequency band (0.05 Hz < f < 0.2 Hz) where higher forces and displacements occur, a non-linear multilayer perceptron is chosen to model the non-linear relations between measurements. By applying two mathematical models for the relevant frequency ranges, all the information from the measurement data can be used for system identification and novelty detection under varying environmental conditions.     

Rollover prevention for heavy trucks using frequency shaped sliding mode control

Control and handling of heavy commercial vehicles carrying liquid cargo are influenced by liquid movement within the partially filled tank. During steering and braking maneuvering tasks, the truck may exhibit unstable behavior at lateral acceleration levels of 0.3 g to 0.4 g [m/s²]. The fluid slosh forces and dynamic load transfers in the lateral and longitudinal directions and parametric uncertainties caused by moving liquid cargo affect the overall dynamics of the vehicle. To solve a physical problem about the minimal excitation of the slosh dynamics associated with the longitudinal and lateral excitation of the vehicle, dynamic sliding surface design combined with recursive backstepping algorithm is introduced. Compensator dynamics are introduced in the sliding mode through a class of switching surfaces which has the interpretation of linear operators such that the resulting closed-loop system retains the insensitivity to uncertainties in the sliding mode while minimizing the excitation of flexible modes and unmodeled dynamics. The frequency shaped backstepping sliding mode algorithm, proposed by Acarman and Özgüner [Frequency shaping compensation for backstepping sliding mode control. Paper presented at the 15th IFAC World Congress, Barcelona, Spain, 2002], is designed to stabilize and to attenuate the sloshing effects of moving cargo by properly choosing the crossover frequencies of the dynamic compensators in accordance with the fundamental frequencies of the slosh dynamics.     

基于先验信息的自适应核函数设计

针对多分量线性调频信号，提出一种新的自适应核函数，并给出了有效的核参数估计方法。相对于自适应高斯核函数而言，该核函数既能获得更好的交叉项抑制效果，又避免了较大的信号能量损失，因而是一种更好的核函数。计算机仿真结果验证了其有效性。