In order to accommodate higher speeds,heavier axle weights,and vibration damping criteria,a new floating slab structure was proposed.The new type of floating slab track structure was composed of three prefabricated fl...In order to accommodate higher speeds,heavier axle weights,and vibration damping criteria,a new floating slab structure was proposed.The new type of floating slab track structure was composed of three prefabricated floating slabs longitudinally interconnected with magnesium ammonium phosphate concrete(MPC).This study investigated the dynamic performance of the structure.We constructd a full-scale indoor experimental model to scrutinize the disparities in the impact performance between a longitudinally connected floating slab track and its longitudinally disconnected counterpart.Additionally,a long-term fatigue experiment was conducted to assess the impact performance of longitudinally connected floating slab tracks under fatigue loading.The findings are described in the following.1)The new structure effectively suppresses ground vibrations,exhibiting a well-balanced energy distribution profile.However,the imposition of fatigue loading leads to a reduction in the damping performance of the steel spring damping system,thereby reducing its capacity to attenuate structural vibrations and leading to an increase in ground vibration energy;2)After 107 loading cycles,the attenuation rate of the vibration acceleration for the MPC increases by 171.9%.Conversely,at the corresponding disconnected location,the attenuation rate of ground vibration acceleration decreases by 65.6%.In conclusion,longitudinally connected floating slab tracks exhibit superior vibration reduction performance.While the vibration reduction performance of longitudinally connected floating slab tracks may diminish to some extent during long-term service,these tracks continue to meet specific vibration reduction requirements.展开更多
In order to solve the problem of discontinuity of target tracking and large number of false alarm targets given to the same target by multi-node sonar system,a joint SVM-GAN algorithm for interrupted track association...In order to solve the problem of discontinuity of target tracking and large number of false alarm targets given to the same target by multi-node sonar system,a joint SVM-GAN algorithm for interrupted track association connection is proposed.Based on the association of acoustic features of the target track before and after the interruption,support vector machine(SVM)is used to establish the association relationship among the spatio-temporal non-overlapping tracking tracks,and the generative adversarial network(GAN)is used to continue the track set which is formed the association relationship.Meanwhile,a feedback mechanism is established to synchronically place the complete track into the training set to improve the adaptability of the algorithm to the application environment.The simulation and measured data processing results show that the proposed method can correlate the track with the acoustic characteristics of the target and track the interrupted track continuously.The association accuracy is more than 80%,and the number of false alarms is effectively reduced.It can be used for large range acoustic target monitoring at sea.展开更多
基金Project(2022-Major-14)supported by the Science and Technology Research and Development Program Project of China Railway Group Limited。
文摘In order to accommodate higher speeds,heavier axle weights,and vibration damping criteria,a new floating slab structure was proposed.The new type of floating slab track structure was composed of three prefabricated floating slabs longitudinally interconnected with magnesium ammonium phosphate concrete(MPC).This study investigated the dynamic performance of the structure.We constructd a full-scale indoor experimental model to scrutinize the disparities in the impact performance between a longitudinally connected floating slab track and its longitudinally disconnected counterpart.Additionally,a long-term fatigue experiment was conducted to assess the impact performance of longitudinally connected floating slab tracks under fatigue loading.The findings are described in the following.1)The new structure effectively suppresses ground vibrations,exhibiting a well-balanced energy distribution profile.However,the imposition of fatigue loading leads to a reduction in the damping performance of the steel spring damping system,thereby reducing its capacity to attenuate structural vibrations and leading to an increase in ground vibration energy;2)After 107 loading cycles,the attenuation rate of the vibration acceleration for the MPC increases by 171.9%.Conversely,at the corresponding disconnected location,the attenuation rate of ground vibration acceleration decreases by 65.6%.In conclusion,longitudinally connected floating slab tracks exhibit superior vibration reduction performance.While the vibration reduction performance of longitudinally connected floating slab tracks may diminish to some extent during long-term service,these tracks continue to meet specific vibration reduction requirements.
基金supported by the National Key Research and Development Program of China(2022YFC2807800)the National Natural Science Foundation of China(U20A20329).
文摘In order to solve the problem of discontinuity of target tracking and large number of false alarm targets given to the same target by multi-node sonar system,a joint SVM-GAN algorithm for interrupted track association connection is proposed.Based on the association of acoustic features of the target track before and after the interruption,support vector machine(SVM)is used to establish the association relationship among the spatio-temporal non-overlapping tracking tracks,and the generative adversarial network(GAN)is used to continue the track set which is formed the association relationship.Meanwhile,a feedback mechanism is established to synchronically place the complete track into the training set to improve the adaptability of the algorithm to the application environment.The simulation and measured data processing results show that the proposed method can correlate the track with the acoustic characteristics of the target and track the interrupted track continuously.The association accuracy is more than 80%,and the number of false alarms is effectively reduced.It can be used for large range acoustic target monitoring at sea.
