安楚高速公路SMA混合料组成设计中若干问题的试验研究

通过室内试验,分析级配组成对SMA混合料骨架结构的影响、细集料品质对SMA混合料体积参数的影响、试件击实次数对SMA混合料试件体积参数的影响,并分析木质素纤维状态对SMA混合料的析漏量的影响,为SAM混合料的应用技术提供建设性意见。     

盘海营高速公路SMA路面试验段施工

SMA路面同以往的密级配沥青混凝土路面相比,在抗车辙、防水损害、耐久性、抗滑等指标方面均有显著提高,故此对SMA路面的施工特点、施工工艺行总结分析,对今后该类型路面施工有较好的指导意义及使用价值.     

博尼维沥青混凝土在石黄高速公路中的应用

在沥青混凝土中掺加一定量的短纤维,纤维对沥青混凝土具有改性、加筋和桥联作用,可以大幅度提高沥青混凝土的性能,延长路面的使用寿命。本文介绍了博尼维纤维在国内外的应用情况,通过博尼维沥青混凝土在石黄高速公路中的应用实例,对博尼维纤维的作用机理、使用效果作了说明,并对它进行了效益分析。     

曲轴、凸轮轴传感器故障时的电控柴油机喷射控制

根据故障传感器类别、发动机运转情况的不同将发动机状态分类,并确定了各状态间的转换条件及传感器失效判断算法。对应不同状态,建立了不同的相位判断算法与喷射控制时序,编写了完整的曲轴、凸轮轴传感器故障时的喷射控制软件。实验结果表明,该喷射控制软件可在曲轴、凸轮轴传感器失效或恢复的情况下维持发动机运转。     

数据采集系统在混合动力电动汽车上的应用

对3种不同混合动力电动汽车型式进行数据参数分类,指出不同结构类型下,车辆数据采集的参数数量和方式有所区别。对数据参数的采集要求和参数特性进行分析,并提出了相应的解决方案。通过数据采集系统在串联式和并联式混合动力汽车上的应用,分析城市工况下两种混合驱动模式中蓄电池、发动机、电机和整车工作特性,并对其控制策略进行论述。     

二维PSD在前照灯检测仪对光上的研究

介绍了传统的前照灯检测仪与被检车灯基准中心对准的对光方式。阐述了PSD位置传感器的工作原理,分析了利用二维PSD对前照灯检测仪进行对光的检测原理,进行了试验验证。结果表明,采用二维PSD对前照灯检测仪进行对光,其检测精度高、结构简单熏克服了传统对光方式精度低或成本高的缺点,为前照灯检测仪的研制提供了新思路。     

Evaluation of RAOs of a semi-submersible platform using field measurements: A full-scale model in Caspian sea environmental conditions

The present research investigates the motion response of a semi-submersible platform using measured field data. The Iran-Amirkabir semi-submersible platform (SSP) was considered as full-scale model in operation conditions. First, 14 accelerometer sensors were installed on the platform's hull, and measurements were made in 5 different scenarios in the Caspian Sea environmental conditions. Then, the Response Amplitude Operators (RAOs) for six degrees of motion were extracted using measured accelerator data. The Surge, Sway, and Heave RAOs processed by the Kalman estimation filter, Pitch, Roll, and Yaw RAOs were calculated from the Sensor Array method. Moreover, the boundary element method in ANSYS/AQWA software for the Iran-Amirkabir semi-submersible model was developed, and the RAO results were validated against the extracted field measurements. The obtained results from the Sensor Array method and the Kalman estimation filter are compared with the numerical simulations, which show Root Mean Square Errors of less than 3% and 4%, respectively for rotational and translational movements. The Mean Square Errors between both methods were also close to zero. Therefore, the proposed methods predicted activities of the studied SSP with relatively good accuracy by field data collected in the Caspian Sea.     

Flexural wave bandgap and isolation characteristics of vibration and sound in periodic sandwich plates北大核心CSCD

[目的]旨在研究轻质夹芯板弹性波的传播规律与减振降噪机理。[方法]采用有限元方法结合布洛赫定理,对周期性夹芯板色散关系与弯曲波带隙特性进行研究,分析振动传输特性和声传输特性,研究轻质夹芯板减振降噪特性,并对轻质夹芯板振动传递衰减特性进行实验验证。[结果]研究结果表明,由于布拉格(Bragg)散射调制作用,轻质夹芯板在特定频段存在弯曲波带隙,弯曲振动带隙频率范围内具有良好的减振降噪效果。[结论]轻质夹芯板结构参数对弯曲波带隙具有显著的调节作用,为舰船结构振动噪声控制与声隐身设计提供了新的技术途径。