集成主被动式安全带的性能评估及优化分析

针对高级驾驶员辅助系统（ADAS）功能多、集成度低的情况,提出了将可逆预紧式安全带与车道偏离预警系统、前方碰撞预警系统和疲劳驾驶监测系统集成为一体的集成式主被动安全系统。在探讨了该集成系统的工作原理和控制策略基础上,通过开展志愿者实车道路实验研究了前方预警系统的碰撞时间阈值、安全带预紧力以及安全带预紧时产生的噪声三个因素对乘员主观感受的影响。对志愿者的主观评价和实验数据的对比分析表明：该集成系统的控制策略逻辑合理,在各个工况下能够主动触发以提醒和约束乘员;但是初期由于预警提醒的频次过高和噪声较大影响了乘员的驾驶体验。经过降低预警系统碰撞时间阈值和优化调整安全带的传动结构,提高了乘员的驾驶体验。该集成式主动安全系统可有效地辅助驾驶员驾驶,且满足乘员的主观可接受度。     

Morpho‐palynological investigations of natural resources: A case study of Surghar mountain district Mianwali Punjab,Pakistan

Surghar mountain belt has comparatively less natural resources of floral diversity because it is composed of minerals of different kinds making it less favorable for the growth of different vegetation. The pollen morphology of some selected plants from Surghar belt Mainwali has been evaluated. The pollen grains were measured and demonstrated using scanning electron microscopy (SEM). The examined plant specimens have a difference in size, shape, polarity, and their exine ornamentation. The pollen taxa show a huge variation in size and sculpture. Pollen fertility has also been estimated, shows that the selected plants are well‐known in the Surghar belt. The need of the hour is to conserve these plants having a higher fertility rate to cope with the deforestation in an area. The conclusion does not favor theories in which deforestation results in fast growth in population. It shows that the irrational management and unlawful cutting down of woods neglected by the forest department are the main causes of deforestation in the mountain belt of Mianwali. The findings show the importance of morphological characteristics in the identification of natural resource species in the area.     

PETROLEUM SYSTEMS MODELLING IN A FOLD‐AND‐THRUST BELT SETTING: THE INVERTED CAMEROS BASIN,NORTH‐CENTRAL SPAIN

The Mesozoic Cameros Basin, northern Spain, was inverted during the Cenozoic Alpine orogeny when the Tithonian – Upper Cretaceous sedimentary fill was uplifted and partially eroded. Tar sandstones outcropping in the southern part of the basin and pyrobitumen particles trapped in potential source rocks suggest that hydrocarbons have been generated in the basin and subsequently migrated. However, no economic accumulations of oil or gas have yet been found. This study reconstructs the evolution of possible petroleum systems in the basin from initial extension through to the inversion phase, and is based on structural, stratigraphic and sedimentological data integrated with petrographic and geochemical observations. Petroleum systems modelling was used to investigate the timing of source rock maturation and hydrocarbon generation, and to reconstruct possible hydrocarbon migration pathways and accumulations. In the northern part of the basin, modelling results indicate that the generation of hydrocarbons began in the Early Berriasian and reached a peak in the Late Barremian – Early Albian. The absence of traps during peak generation prevented the formation of significant hydrocarbon accumulations. Some accumulations formed after the deposition of post‐extensional units (Late Cretaceous in age) which acted as seals. However, during subsequent inversion, these reservoir units were uplifted and eroded. In the southern sector of the basin, hydrocarbon generation did not begin until the Late Cretaceous due to the lower rates of subsidence and burial, and migration and accumulation may have taken place until the initial phases of inversion. Sandstones impregnated with bitumen (tar sandstones) observed at the present day in the crests of surface anticlines in the south of the basin are interpreted to represent the relics of these palaeo‐accumulations. Despite a number of uncertainties which are inherent to modelling the petroleum systems evolution of an inverted and overmature basin, this study demonstrates the importance of integrating multidisciplinary and multi‐scale data to the resource assessment of a complex fold‐and‐thrust belt.     

管状带式输送机使用故障分析及对策

简要介绍了管状带式输送机的结构和特点,根据某电厂输送燃煤用管状带式输送机现场使用情况,分析了管状带式输送机使用过程中常见的胶带扭曲、跑偏、折叠及胀管等故障的成因。针对故障提出了调整承载托辊角度、装设限位开关、设置头部过渡段压辊以及操作方法改进等预防及处理措施,有效解决了管状带式输送机的故障,可为类似故障处理提供参考。     

金属网编织过程断经问题的研究

对金属丝网编织过程中的断经问题进行分析。介绍断经产生的原因:综吊的位置过低或过高;合绞时间过早;压砣过重,丝网张力大;织机转速过快,或织机自停和保险装置失灵;剑带不光滑;综片有毛刺;送经量少于卷网量;钢筘夹丝、剑带跑斜或运动不稳等。提出防止经丝断头的方法:金属丝材力学性能稳定,符合技术要求;工艺参数准确;接扣必须要接好;断经抽头要接顺;保证自停电气装置正常;确定剑带不挂丝,运行平稳;及时理顺经辊上的多余丝头。     

芳纶机织骨架材料增强轻型输送带的拉伸性能研究

轻型输送带的拉伸性能是其产品质量的重要指标,作为染整印花工作平台的轻型输送带对拉伸性能提出了更高的要求.为提高芳纶机织增强轻型输送带的拉伸性能,分别针对芳纶骨架材料定型处理的工艺和成品测试试样的规格对芳纶织物增强轻型输送带拉伸性能的影响进行观察与分析.结果表明:涂胶预定型处理能有效提高芳纶骨架材料增强输送带的拉伸强度、...     

新型高效聚酯平带摩擦传动的探讨

为了提高平带的传动效率、降低自身能耗并延长其使用寿命,分析了新型高效聚酯平带的结构,重点阐述了其高速传动中的受力状况、应力状况、运动特性及其摩擦性能;应用实践表明:高速平带研发时应采用高新技术功能材料,带体应向强、薄、轻、柔方向发展,橡胶层须具有适度的弹性和优异的摩擦驱动性能,才能降低传动过程中离心力、弯曲应力和弹性滑...     

同步带传动失效及疲劳寿命研究

通过实验及理论分析，探讨了带的张力、带及带轮的节距差、齿形等对同步带传动的失效形式及疲劳寿命的影响，并分析了同步带产生疲劳破坏的机理．     

闭合环形金属薄带纠偏控制系统的设计与实现

介绍了一种新型印染机上用的金属薄带纠偏控制系统的设计与实现,该系统是一套利用旋转编码器为传感器,可编程控制器为控制装置,脉冲驱动步进电机为驱动器的智能化纠偏装置.文中详细阐述了装置的工作原理、设计思想与实现方法.     

气垫带式输送机专用风机的试验研究

依据 GB 12 36 - 85“通风机空气动力性能试验”、 GB/T 2 888- 91“风机和罗茨鼓风机噪声测量方法”和GB 10 178- 88“通风机现场试验”,结合气垫带式输送机供风系统的性能要求和使用特点 ,介绍了气垫带式输送机专用风机的空气动力性能试验、噪声试验和现场试验的方法。