The development and expansion of overseas short - duration turbine testing techniques were summarized and analyzed by comparing the advantages and disadvantages of short / long duration turbine testing techniques 摘要对国外短周期涡轮实验技术的发展及其应用范围开拓的情况进行了综述和分析，比较了长短周期涡轮实验技术各自的优点和不足。
As the wing - pivot frequency decreases , it couples with the vehicle short - period mode resulting in dynamic instability . a similar instability sometimes occurs when the pivot mode couples with the fuselage - bending mode 随其频率降低,它与飞行器短周期模态耦合时会导致飞行器动不稳定,而与机身弯曲模态耦合时同样会导致模型动不稳定性。
As an important basic study platform , short - duration turbine testing plat form has developed in the mechanism research field and has now been applied to validation of new design concept and check of cfd software 同时，作为重要的基础研究平台，短周期涡轮实验台在机理研究领域也有所拓宽，开始被应用于新设计理念的验证、 cfd设计分析软件的校验等新的领域。
Spurred by the demand of developing high performance aeroengine , the short duration turbine testing technique was improved greatly to achieve the measurement accuracy of long - duration turbine testing technique 近年来，在发展高性能航空发动机的需求带动下，短周期涡轮实验技术正在努力克服自身的薄弱环节，力争达到长周期涡轮实验技术所能达到的性能测试精度。
Therefore , how to develop products with lower cost and higher quality within a short lead - time turn into a key to enhance enterprises " competition and shake off their predicaments , and is also a " bottleneck " that baffles most enterprises 在较短周期内开发出低成本高质量的产品是企业提高竞争力、摆脱困境的关键，也是大多数企业实现自身发展面临的一个“瓶颈” 。
We also analyzed the influence of the short - period changes on the spatial correlation of daily variation and found that the influence of the hour - period on the spatial correlation is larger than the shorter period 同时分析了短周期成份对日变化空间相关性的影响，发现对日变化空间相关性影响较大的周期成份在小时级左右，而更短周期成份的变化对日变化空间相关性影响不大。
However , b ecause t he d isplacement o f v ibration t able u sed i n t he t est i s 1 imited t o 4cm , the results of the testing could prove only partially the damping effect for ground motions with significant short - period contents 由于振动台振动位移的限制，振动台试验仅能进行短周期成分丰富的地震动试验，不能全面地评价断路器的抗震性能和铅合金减震器的减震效果。
The paper discusses a few problems related to methods and techniques of fast and precise updating of the land use database by means of " 3s " technology , and provides reference for a short - term survey of land use status and a new round of detailed survey of national land use change 文中探索了利用35技术快速、准确地更新土地利用数据库的几个技术方法问题，以实现短周期调查更新土地利用现状，为新一轮全国土地详查提供参考。
Simultaneously , along with market acute competition , the fashion period of textile industry is getting shorter and shorter , it is a remarkable trend for modern textile manufactures to pursue zero stock , short period , small batch , high frequency and quickly delivering 同时，纺织行业时尚流行的周期变得越来越短，市场不确定性增加，个性化、短周期、小批量、高频率、快速交货和追求零库存成了现代纺织制造业的显著趋势。
