With the improvement of the economic level and the development of automobile technology, the vehicle interior noise control is required to reduce the sound pressure level. In addition, it is necessary to improve the sound quality by adjusting the sound characteristics. In order to meet this goal, ma...

Taking a 6-cylinder, four-stroke, two-stage turbocharged marine diesel engine as the research object, the coupled simulation model of Miller cycle and exhaust gas recirculation (EGR) of two-stage turbocharged diesel engine was established, and the influences of Miller cycle and EGR coupling on the f...

Using the high-frequency fatigue dynamic stiffness test platform and combining with the actual operation conditions of high-speed railway, the stiffness characteristics of Vossloh W300 fastener system under assembly state were studied, and following results were obtained. 1) Under different preloadi...

In the carbon neutral target scenario, a calculation model for total cost of ownership (TCO) of fuel cell vehicles was developed, and the learning curve theory was applied to predict the cost trend of the key components of fuel cell vehicles. The future cost of hydrogen production for the current ma...

As a high-precision motion platform, the micro positioning platform driven by the voice coil motor is widely used in precision machining, micro-electromechanical and other fields. Aiming at the high-precision and stable tracking control problem of the micro positioning platform driven by the voice c...

The shaft is deformed with the action of load. The misalignment due to deformation caused by the action of load is considered. The fluid-structure interaction method was used. Navier-Stokes equation was solved directly. The three-dimensional transient analysis of shaft and oil film in journal bearin...

During the process of machine tool precision optimization design, it often regards the error as constant and ignores error distribution in the traditional precision allocation. Based on the analysis of traditional precision allocation method, a precision allocation optimization design of five axis m...

Accurate acquisition and distortion compensation of point cloud model was the key to 3D laser scanning technology for inspection of parts. A method of obtaining high-precision 3D point cloud model by distortion compensation is proposed. The 3D point cloud model of parts was reconstructed by using a ...

To improve the deficiency that the traditional filter-x least mean square (FxLMS) algorithm can not take into account the steady-state error and convergence speed, a variable step size FxLMS (Cosh-FxLMS, ChFxLMS) algorithm based on cosh function was proposed. The relationship between the error signa...

Aluminum and steel were welded by laser keyhole spot welding technology. The laser keyhole spot welding of Al/steel was tested by orthogonal experiment, influences of time, laser power and defocusing amount on mechanical properties of the joint were studied. The results show that the influence of la...

Phospholipase PLA2G1B is closely related to diet-induced obesity and related metabolic disorders. Studies have shown that some natural flavonoid compounds can inhibit phospholipase. An integrated molecular docking and pharmacophore strategy was used to screen PLA2G1B-targeted small molecule inhibito...

Aggregation-induced emission (AIE)-active materials show important applications in organic photoelectric functional materials. By introducing a phenyl ring, a deplanarization core into the 4-site of naphthalimide chromophore through the typical Suzuki coupling reaction, two new AIE molecules (NIRF2 ...

The 2UPR/UPS/UP redundant parallel mechanism (PM) with three degrees of freedom was taken as the research object. According to constraint conditions of this PM, the inverse solution of position and the Jacobian matrix were solved by establishing closed-loop vector equation of each branch. Based on k...

Considering the regional differences of the Yangtze River Delta urban agglomeration, the ecological environment vulnerability assessment differences index system of the Yangtze River Delta urban agglomeration was constructed based on the sustainable development pressure-state-response (PSR) model, a...

The emergence of virtual fitting system provides consumers with a new shopping experience. To study the relationship between mobile virtual fitting system and purchase behavior, the relationship between sensory experience, perceived service quality, perceived technology and purchase behavior were te...