Abstract: A smart acoustic information recognition-based welded weld impact quality determination method and system, comprising: controlling a tip of an ultrasonic impact gun (1) to perform impact treatment on a welded weld with different treatment pressures, treatment speeds, treatment angles and impact frequencies, obtaining acoustic signals during the impact treatment, calculating feature values of the acoustic signals, and constructing an acoustic signal sample set including various stress conditions; marking the acoustic signal sample set according to impact treatment quality assessment results for the welded weld; establishing a multi-weight neural network model, and using the marked acoustic signal sample set to train the multi-weight neural network model; obtaining feature values of welded weld impact treatment acoustic signals to be determined, inputting the feature values into the trained multi-weight neural network model, and outputting determination results for welded weld impact treatment quality to be det

Abstract: Systems and methods for simulating subterranean regions having multi-scale, complex fracture geometries in a realistic simulation environment, which includes in the modeling process three-dimensional multi-scale rock discontinuities, hydraulic fractures, and heterogenous reservoir properties. Non-intrusive embedded discrete fracture modeling formulations are applied in conjunction with commercial or in-house simulators to efficiently and accurately model subsurface characteristics including three-dimensional geometries having combinations of complex hydraulic fractures and multi-scale rock discontinuities.

Abstract: A radial piston hydraulic device distributed by pilot operated check valves includes a housing, a plurality of piston assemblies, a main shaft, the rotating shaft, first pilot operated check valves having a same number with the plurality of piston assemblies and one-to-one corresponding to the plurality of piston assemblies, and second pilot operated check valves having a same number with the plurality of piston assemblies and one-to-one corresponding to the plurality of piston assemblies. The housing includes a plurality of piston chambers, a rotating shaft chamber, a high-pressure oil passage, and a low-pressure oil passage. Each of the plurality of piston assemblies is slidable up and down in a corresponding piston chamber of the plurality of piston chambers. The main shaft is rotatably connected to the housing and is connected to the plurality of piston assemblies in a transmission way.

Abstract: The present disclosure relates to a radial piston hydraulic device distributing flow by pilot operated check valves and an operating method thereof. The radial piston hydraulic device includes a housing, a plurality of piston assemblies, a main shaft, first pilot operated check valves, second pilot operated check valves, and a valve plate. The first pilot operated check valves have a same number as the plurality of piston assemblies and are one-to-one corresponding to the plurality of piston assemblies. The second pilot operated check valves have a same number as the plurality of piston assemblies and are one-to-one corresponding to the plurality of piston assemblies. The radial piston hydraulic device can be used not only as the hydraulic motor, but also as a hydraulic pump, and can be used in a hydraulic system that need to realize power recovery functions.

Abstract: A radial piston hydraulic device distributed by pilot operated check valves includes a housing, a plurality of piston assemblies, a main shaft, the rotating shaft, first pilot operated check valves having a same number with the plurality of piston assemblies and one-to-one corresponding to the plurality of piston assemblies, and second pilot operated check valves having a same number with the plurality of piston assemblies and one-to-one corresponding to the plurality of piston assemblies. The housing includes a plurality of piston chambers, a rotating shaft chamber, a high-pressure oil passage, and a low-pressure oil passage. Each of the plurality of piston assemblies is slidable up and down in a corresponding piston chamber of the plurality of piston chambers. The main shaft is rotatably connected to the housing and is connected to the plurality of piston assemblies in a transmission way.

Abstract: An automatic opening umbrella mechanism which provides a new design, by which users can open an umbrella in a quick and accurate manner with enhanced efficiency. The structure primarily contains a spring disposed between the midpoint of a first main umbrella stretcher and the upper end of the umbrella runner. The resilient restoring force of the spring helps opening an umbrella.

Abstract: An opening structure of a multiple folded umbrella is provided that includes a shaft formed by several tubes, a runner provided around the shaft, an upper connector provided on an upper tube of the shaft, and a frame having many ribs pivotally connected with the upper connector and the runner. The upper tube of the shaft is provided with an inwardly directed flange at a position intermediate opposing ends of the upper tube, and a plate is provided on the flange. A connecting cap is slidingly received in the top end of the upper tube and receives a spring within the cap and within the upper tube, concealing the spring within the upper tube. The upper connector is cylindrical and slides on the upper tube and has a small volume, to thereby be carried and stored more easily and conveniently.

Abstract: An improved opening structure of an unfolded umbrella includes a shaft with an upper mounting ring, a runner around the shaft, a frame having many ribs connected with the upper mounting ring and the runner, a button mounted on the shaft to engage with the runner for closing the umbrella. A rod is provided in the shaft at a lower position, an aperture is formed on the shaft with a wheel, and an elastic rope having one end connected with the rod and the other end extending upward to pass by the wheel, and to connect with the runner. When the umbrella is closed, the elastic rope is stretched that obtains a recovering force to open the umbrella quickly and automatically when the runner is unlocked.

Abstract: This invention relates to an improved controlling apparatus of an umbrella which includes an opening slice, a closing slice, and an L-shape slice in a handle of the umbrella. A button on the handle can be pressed to control the opening slice or the closing slice moved inward to open or close the umbrella. Since the L-shape slice will be pushed downward before the button is pressed to open the umbrella, it is possible to prevent from any mistake when in opening operation of the umbrella.