基于TEAMS的直升机传动系统测试性建模分析

直升机以其垂直起降和卓越的机动性能,在战场作战、战场运输、战损评估、应急、救援等多个领域得到广泛应用.由于直升机的飞行环境恶劣,工况多变,其动部件(主要包括:旋翼系统、传动系统和发动机)的故障时有发生,可能会造成严重事故.据研究人员统计,在由机械故障引起的直升机飞行事故中,超过一半多的事故原因可以归咎于动部件故障.在1...     

3D characteristic diagram of acoustically induced surface vibration with different landmines buried

The 3D characteristic diagram of acoustically induced surface vibration was employed to study the influence of different buried landmines on the acoustic detection signal. By using the vehicular experimental system for acoustic landmine detection and the method of scanning detection, the 3D characteristic diagrams of surface vibration were measured when different objects were buried underground, including big plastic landmine, small plastic landmine, big metal landmine and bricks. The results show that, under the given conditions, the surface vibration amplitudes of big plastic landmine, big metal landmine, small plastic landmine and bricks decrease in turn. The 3D characteristic diagrams of surface vibration can be used to further identify the locations of buried landmines.     

如何正确认识和运用工程量清单计价模式

实行工程量清单计价是建筑业市场化的必然要求，各建筑企业应充分认识工程量清单计价的意义，重视并着手整理编制自己的企业定额。     

在改革的道路上开拓前进——纪念党的十一届三中全会召开十周年

十年前召开的党的十一届三中全会,实现了我党历史上具有深远意义的伟大转折,扭转了“左”倾错误方向,把全党的工作重点转移到社会主义现代化建设上来。并逐步确立一条建设具有中国特色的社会主义的正确道路。十年来,全党和全国人民坚持四项基本原则,坚持改