Abstract Purpose The purpose of this paper is to experimentally and numerically study the transient hydraulic impact overall performance during startup accelerating process mixed-flow pump. Design/methodology/approach In study, impeller rotor vibration characteristics starting period under action fluid–structure interaction was investigated, which based on bidirectional synchronization cooperative solving method for flow field structural response Experimental external characteristic...

The application of train-to-train (T2T) communication in urban rail transit is expected to simplify system structure, reduce maintenance costs, and improve operational efficiency. In particular, train-to-wayside (T2W) coexist with T2T the train control based on communication. To make full use limited spectrum resources, frequency reuse adopted as an efficient technique, but it brings co-channel interference unfortunately, which affects quality service (QoS) for T2W users. this paper, we...

Abstract As an emerging technology, virtual coupling improves the efficiency and flexibility of metro services by forming multiple trains (units) as a virtually coupled train set (VCTS) without mechanical couplers. However, to realize desired VCTS operation in practical services, significant gap be filled is that implicit nonlinear safety constraints are hard addressed real‐time control. Thus, this paper proposes hierarchical control approach with two‐layer framework. In upper layer,...

The behavior of rip currents with changing bar and gap lengths was tested in a series laboratory experiments using video-tracked floating drifters. Qualitatively, showed strong differences overall character topography. As narrow gaps became wider, the circulation tended to first travel parallel shoreline instead immediately offshore, although offshore-directed flows were found for all topographies. Quantitatively, width neck increase slowly when compared increasing channel. Maximum offshore...

Shear-wave velocity logs are useful for various seismic interpretation applications, including bright spot analyses, amplitude-versus-offset analyses and multicomponent interpretations. This paper presents a method predicting the shear-wave of argillaceous sandstone from conventional log data experimental data, based on Gassmann's equations Xu–White model. variable aspect ratio takes into account all influences matrix nature, shale content, porosity size pore geometry, properties fluid...

Considering the intelligent train control problem in long-term evolution for metro system, a new train-to-train communication-based system is proposed, where cooperative formation technology introduced realizing more flexible operation mode. To break limitation of centralized control, pre-exploration-based two-stage deep Q-learning algorithm adopted formation, which one first approaches urban railway control. In addition, comfort-considered given, optimization measures are taken providing...

Based on the structural analysis and roll mechanisms of counterbalanced forklift truck, a novel type 3-link hydraulic supporting mechanism is designed as an actuator for anti-rollover control. A rollover grading control strategy lateral stability truck proposed, which used to design variable universe fuzzy controller. The first-order utilized when in roll, whereas second-order roll. virtual prototype model built Automatic Dynamic Analysis Mechanical Systems (ADAMS). co-simulations vehicle...

Residual moveout based wave-equation migration velocity analysis uses residual to characterize the kinematic error caused by inaccurate model, and computes updates using tomographic operators. However, per iteration cost of this method is even more expensive than that full waveform inversion because construction back-projection offset/angle domain commonimage gathers. In order speed up analysis, we examined its work flow, proposed following acceleration scheme: 1) compressed-sensing...

During the last few years, integration and sharing of urban traffic information is one popular topics, further comparison analysis carried out on these different methodology technology available to issue, 3G network model built. The used discuss transportation based model, it useful formulation unban information.