Recently,ambient vibration test(AVT)is widely used tu estimate dynamic characteristics of large civil struc- tures.Dynamic characteristics ean be affected by various envirnnmental factors such as humidity,intensity of...Recently,ambient vibration test(AVT)is widely used tu estimate dynamic characteristics of large civil struc- tures.Dynamic characteristics ean be affected by various envirnnmental factors such as humidity,intensity of wind,and temperature.Besides these environmental conditions,tire mass of vehicles may change the measured valnes when traffic-in- duced vibration is used as a source of AVT tor bridges.The effect of vehicle mass on dynamic characteristics is investigated through traffic-induced vibration tests on three bridges;(1)three-span suspension bridge(128m+404m+128m),(2) five-span continuous steel box girder bridge(59m+3@ 95m+59m),(3)simply supported plate girder bridge(46m). Acceleration histories of each measurement location under normal traffic are recorded for 30 minutes at field.These recor- ded histories are divided into individual vibrations and are combined into two groups aceording to the level of vibration;one by heavy vehicles such as trucks and buses and the other by light vehicles such as passenger cars.Separate processing of the two groups of signals shows that,for the middle and long-span bridges,the difference can be hardly detected,but,for the short span bridges whose mass is relatively small,the measured natural frequencies can change up to 5.4%.展开更多
对某型履带车辆悬挂系统合理简化,建立了加速度激励下多输入-输出的整车主动悬挂系统动力学模型;按照研究半主动悬挂控制的一般步骤,应用线性二次高斯(Linear Quadratic Gaussian,LQG)理论,接合工程软件M at lab,设计了考虑数据采集系...对某型履带车辆悬挂系统合理简化,建立了加速度激励下多输入-输出的整车主动悬挂系统动力学模型;按照研究半主动悬挂控制的一般步骤,应用线性二次高斯(Linear Quadratic Gaussian,LQG)理论,接合工程软件M at lab,设计了考虑数据采集系统受环境噪声影响的最优控制力和半主动控制力;仿真结果显示,车辆平顺性得到大幅度改善,验证了模型及控制策略的有效性.展开更多
基金the Ministry of Construction and Transportation,Korea Highway Corporation and Hyundai E&C Co.Ltd.under Project No.R&D/970003-2.
文摘Recently,ambient vibration test(AVT)is widely used tu estimate dynamic characteristics of large civil struc- tures.Dynamic characteristics ean be affected by various envirnnmental factors such as humidity,intensity of wind,and temperature.Besides these environmental conditions,tire mass of vehicles may change the measured valnes when traffic-in- duced vibration is used as a source of AVT tor bridges.The effect of vehicle mass on dynamic characteristics is investigated through traffic-induced vibration tests on three bridges;(1)three-span suspension bridge(128m+404m+128m),(2) five-span continuous steel box girder bridge(59m+3@ 95m+59m),(3)simply supported plate girder bridge(46m). Acceleration histories of each measurement location under normal traffic are recorded for 30 minutes at field.These recor- ded histories are divided into individual vibrations and are combined into two groups aceording to the level of vibration;one by heavy vehicles such as trucks and buses and the other by light vehicles such as passenger cars.Separate processing of the two groups of signals shows that,for the middle and long-span bridges,the difference can be hardly detected,but,for the short span bridges whose mass is relatively small,the measured natural frequencies can change up to 5.4%.
文摘对某型履带车辆悬挂系统合理简化,建立了加速度激励下多输入-输出的整车主动悬挂系统动力学模型;按照研究半主动悬挂控制的一般步骤,应用线性二次高斯(Linear Quadratic Gaussian,LQG)理论,接合工程软件M at lab,设计了考虑数据采集系统受环境噪声影响的最优控制力和半主动控制力;仿真结果显示,车辆平顺性得到大幅度改善,验证了模型及控制策略的有效性.
