To investigate the vibration response of the comprehensive transportation hub structure under multiple-source excitations,an on-site vibration measurement was carried out at Wuhan Railway Station in China.The characte...To investigate the vibration response of the comprehensive transportation hub structure under multiple-source excitations,an on-site vibration measurement was carried out at Wuhan Railway Station in China.The characteristics of each floor vibration were obtained through the time domain and frequency domain analyses.Based on the vibration characteristic under multiple-source excitations,the proposed attenuation model was derived.In addition,a vibration comfort evaluation on the Wuhan Railway Station was conducted.The results show that the effect of the number of vibration sources on horizontal acceleration is more significant than that regarding vertical acceleration.When the structure is under the effects two vibration sources with different frequencies,a high-frequency vibration can amplify a low-frequency vibration.The derived attenuation model can precisely predict the vibration attenuation and reduce the subsequent vibration test workload.Based on the annoyance rate model result,the annoyance rate of Wuhan Railway Station is high,which is harmful to the staff of the station.展开更多
The advancement of wearable devices continues to face the challenge of ensuring a sustainable power supply.Traditional human motion energy harvesters often suffer from low energy harvesting efficiency due to their rel...The advancement of wearable devices continues to face the challenge of ensuring a sustainable power supply.Traditional human motion energy harvesters often suffer from low energy harvesting efficiency due to their reliance on a single energy source.This study presents a novel pendulum inertial electromagnetic energy harvester(PI-EEH)to harvest multiplesource low-frequency human motion energy.The PI-EEH can simultaneously harvest both the leg swing energy and the foot impact energy during walking.A horizontal universal pendulum,combined with a frequency-up conversion mechanism,transforms irregular human motion into unidirectional high-frequency rotation.The output performance of the PI-EEH is evaluated through both theoretical analysis and experimental testing.A treadmill test is also conducted across various motion speeds to illustrate the benefits of PI-EEH.The peak power of PI-EEH can reach 54 mW at a speed of 3 km/h.Additionally,the PI-EEH can easily supply power for some wearable devices,like a GPS module and an acceleration sensor.The designed PIEEH offers a viable approach to harvesting energy from multiple-source human motion,which will have broad prospects in smart healthcare and IoT applications.展开更多
提出一种基于协同进化蚁群算法的求解QoS(Quality of Service)多播路由问题的新算法。算法中控制参数及路由选择策略根据迭代过程所处的不同阶段自适应调整。综合考虑QoS路由中所有约束条件的同时,也充分考虑各个约束自身的独立特性。...提出一种基于协同进化蚁群算法的求解QoS(Quality of Service)多播路由问题的新算法。算法中控制参数及路由选择策略根据迭代过程所处的不同阶段自适应调整。综合考虑QoS路由中所有约束条件的同时,也充分考虑各个约束自身的独立特性。仿真结果证明了算法收敛速度快,能满足实际网络服务质量的要求。展开更多
基金Science Fund for Distinguished Young Scholars of Hubei Province under Grant No.2023AFA103National Natural Science Foundation of China under Grant No.52078395+1 种基金Open Projects Foundation of State Key Laboratory for Health and Safety of Bridge Structures under Grant No.BHSKL19-07-GFYoung Top-Notch Talent Cultivation Program of Hubei Province。
文摘To investigate the vibration response of the comprehensive transportation hub structure under multiple-source excitations,an on-site vibration measurement was carried out at Wuhan Railway Station in China.The characteristics of each floor vibration were obtained through the time domain and frequency domain analyses.Based on the vibration characteristic under multiple-source excitations,the proposed attenuation model was derived.In addition,a vibration comfort evaluation on the Wuhan Railway Station was conducted.The results show that the effect of the number of vibration sources on horizontal acceleration is more significant than that regarding vertical acceleration.When the structure is under the effects two vibration sources with different frequencies,a high-frequency vibration can amplify a low-frequency vibration.The derived attenuation model can precisely predict the vibration attenuation and reduce the subsequent vibration test workload.Based on the annoyance rate model result,the annoyance rate of Wuhan Railway Station is high,which is harmful to the staff of the station.
基金the support from the National Natural Science Foundation of China(Grant No.12232014)the Fundamental Research Funds for the Central Universities(Grant No.N2403027)the Ten Thousand Talents。
文摘The advancement of wearable devices continues to face the challenge of ensuring a sustainable power supply.Traditional human motion energy harvesters often suffer from low energy harvesting efficiency due to their reliance on a single energy source.This study presents a novel pendulum inertial electromagnetic energy harvester(PI-EEH)to harvest multiplesource low-frequency human motion energy.The PI-EEH can simultaneously harvest both the leg swing energy and the foot impact energy during walking.A horizontal universal pendulum,combined with a frequency-up conversion mechanism,transforms irregular human motion into unidirectional high-frequency rotation.The output performance of the PI-EEH is evaluated through both theoretical analysis and experimental testing.A treadmill test is also conducted across various motion speeds to illustrate the benefits of PI-EEH.The peak power of PI-EEH can reach 54 mW at a speed of 3 km/h.Additionally,the PI-EEH can easily supply power for some wearable devices,like a GPS module and an acceleration sensor.The designed PIEEH offers a viable approach to harvesting energy from multiple-source human motion,which will have broad prospects in smart healthcare and IoT applications.
文摘提出一种基于协同进化蚁群算法的求解QoS(Quality of Service)多播路由问题的新算法。算法中控制参数及路由选择策略根据迭代过程所处的不同阶段自适应调整。综合考虑QoS路由中所有约束条件的同时,也充分考虑各个约束自身的独立特性。仿真结果证明了算法收敛速度快,能满足实际网络服务质量的要求。
