A5005183659- Hydraulic and Pneumatic Systems
- Water Systems and Optimization
- Grouting, Rheology, and Soil Mechanics
- Geotechnical Engineering and Analysis
- Structural Engineering and Vibration Analysis
- Railway Engineering and Dynamics
- Vibration and Dynamic Analysis
- Thermography and Photoacoustic Techniques
- Conservation Techniques and Studies
- Structural Behavior of Reinforced Concrete
- Industrial Automation and Control Systems
- Building materials and conservation
- Real-time simulation and control systems
- Iterative Learning Control Systems
- Control Systems in Engineering
- Industrial Technology and Control Systems
- Rocket and propulsion systems research
- Rock Mechanics and Modeling
Shijiazhuang Tiedao University
2022-2025
Beihang University
2024-2025
Hebei Agricultural University
2023-2025
The pressure pulsation of variable hydraulic system has the characteristics wide range and frequency band, aiming at suppression demand this system, paper proposes a wide-pressure wide-frequency gas-liquid coupling attenuator array structure. This structure utilizes principle to absorb pulsation, achieving complete coverage system's in time domain broadening optimal absorbing band through simultaneous use multiple attenuators pre-charged with different gases. analyses for flow establishes...
The hydraulic system is very reliable and has a high power density. Variable pressure constant pumps are commonly used in real-world applications like systems for heavy machines aviation. Nevertheless, it difficult to adjust frequent fluctuations due the somewhat complicated technological now place variable pumps. In this study, proportional relief valve-based stepless pump proposed. fundamental idea balance valve modify piston pump's output by using of lowering valve. This method less...
In order to ensure that no freezing damage occurs during the service period of tunnels in cold areas, tunnel temperature field model test bench is built according similarity principle study change rule inside season, and a new type active thermal insulation technology proposed - air curtain at portal. Using superposition stream function heat balance, control equation derived, using Bessel differential derive theoretical solution radial surrounding rock portal section area under action,...
Flow ripples caused by the pump will lead to system failure or equipment damage. The bladder type attenuator is utilised suppress flow in piping systems, though its mathematic model has not been given out precisely. In this paper, governing equations of hollow cylindrical shell describing bladder’s behaviour are studied. Considering viscoelastic materials, constitutive function obtained through DMA (Dynamic thermo-mechanical analysis) test and WLF (Williams–Landel–Ferry) equation. Thus,...
In this study, a tunnel temperature field model test bed is built according to the similarity principle study variation law of in cold season. According tunnel, new active thermal insulation measure, namely, an air curtain system, developed. flow function superposition and heat balance, governing equation system obtained. Taking Zhengpantai as example, feasibility verified, jet angle optimized. The research results show that outside surrounding rock are main factors affecting tunnels...
Abstract In the aircraft hydraulic system, constant pressure piston pump, as main power supply component, is widely utilized due to its high efficiency. The flow ripple caused by axial pump may induce pipe vibration and lower components’ reliability, which becomes an especially concerned issue. Compared with traditional relief groove, pre-compression volume (PCV) used in pumps could pre-charge chamber’s reduce backflow more evidently. However, PCV affected system pressure, speed swashplate...
Mudstone is highly sensitive to water. When it comes into contact with water, the softening phenomena such as decrease of strength and increase deformation are prominent. It great significance clarify its related mechanical properties. For tertiary mudstone, a triaxial compression test Brazilian splitting carried out under conditions four kinds water content (0, 10.1%, 12.5%, 14.1%) confining pressures (0 MPa, 2 5 Mpa, 10 MPa). The results show that (1) pressure content, mudstone changes...