93results about How to "Shorten the propagation distance" patented technology

The invention belongs to the technical field of non-destructive testing and relates to an ultrasonic testing method used for composite material foaming structures. According to the method, ultrasonic waves formed by a large number of shock pulse waves in the composite material foaming structures are utilized, and by constructing transfer functions of the ultrasonic waves in the composite material foaming structures, the arithmetical relationship between the ultrasonic waves and different part defects of the composite material foaming structures is set up to carry out defect discriminating and ultrasonic testing; the shock pulse ultrasonic waves of different types, intensities and frequencies and ultrasonic testing achieving methods can be selected, and the different composite foaming structures can be tested in an ultrasonic mode. Actual testing results show that the sensitivity, the resolution and the ability of composite material foaming structure testing are remarkably improved, the defects and the combination conditions of skin, skin/foam cementing areas, foam/foam cementing areas and foam areas can be tested accurately, the testing reliability is greatly improved, and the foam testing thickness can be 100 mm.

The invention relates to a wavelength conversion device, a light emitting device which comprises the wavelength conversion device and a projecting device comprising the wavelength conversion device. The wavelength conversion device comprises a light emitting layer and a reflecting layer which are arranged in a stacked manner. The light emitting layer comprises a first photoluminescence material and a first adhesive. The reflecting layer comprises a second photoluminescence material, a second adhesive and reflecting particles. Light emitted from the reflecting layer completely exits through the light emitting layer, and the light emitting layer and the reflecting layer are directly connected or connected through a sintering layer. On one hand, heat generated by the second photoluminescence material only needs to penetrate a part of the reflecting layer to be emitted, the heat spread distance is shortened, and meanwhile the reflecting capacity of the reflecting layer is retained; and on the other hand, the heat generated by the second photoluminescence material is reduced, the wavelength conversion device can work at a low temperature, and therefore the better light emitting efficiency is achieved.

The invention provides an ultrasonic surface wave velocity measurement system, which comprises an ultrasonic testing device connected with a control device and an oscilloscope separately, wherein the ultrasonic testing device is used for providing a focused transducer of which a probe is vertically downward with electricity, receiving a signal of the ultrasonic probe of the focused transducer and transmitting the signal to the oscilloscope; a sample cell is also arranged at the lower part of the focused transducer; the sample cell containing a liquid; the ultrasonic probe of the focused transducer is immersed into the liquid; and a drive mechanism is fixed on the sample cell and connected with the focused transducer. Only the ultrasonic surface wave velocity of an area of propagating an ultrasonic surface wave, namely the area opposite to the focused transducer is measured, and the propagation distance of the excited ultrasonic surface wave in the material is very small, so that detection of the residual stress of a local area is achieved; and the surface wave is excited by adopting the noncontact focused transducer, so that the residual stress of the surface of a curve structure can be measured, thereby achieving measurement of the residual stress of the curve structure.

The invention relates to the field of automatic target scoring equipment, in particular to a curve distribution type shock wave automatic target scoring system. The curve distribution type shock wave automatic target scoring system comprises a walking mechanism and a target frame assembly; the target frame assembly comprises a target rod, a mounting groove seat and a target plate; a sensor support is arranged in a groove cavity of the mounting groove seat, and sensors are arranged on the sensor support; the sensors are sequentially arranged along the same circumferential line, and the center of the circumference is located in the direction of the induction ends of the sensors; the center of the circumference is located on a connecting line of the middle sensor and the central point of target paper; when the circumferential line formed by the sensors is located on the minimum radius, the center of the circumference is located on the central point of the target paper; the target plate is in a square flat tube shape, and the sensor support is located in a cavity defined by the target plate and the mounting groove seat; and a splinter-proof plate for protecting the sensors is located on the face whether the face of the mounting groove seat is in the shooting direction. The curve distribution type shock wave automatic target scoring system is reasonable and reliable in structure, therefore, the working reliability of the equipment is ensured, and meanwhile, the target scoring precision and the target scoring efficiency are further improved.

The invention discloses a combustion organization method of a methanol/alcohol hydrogen fuel internal combustion engine and application thereof. The combustion organization method comprises the stepsthat part methanol fuel of methanol fuel of tail gas waste heat is catalytically reformed or pyrolyzed on line is used for preparing alcohol hydrogen, and the main component of the alcohol hydrogen ishydrogen; part of the prepared alcohol hydrogen is supplied to an ignition chamber, and hydrogen-enriched mixed gas is formed; and ignition is achieved through a spark plug, a high-energy turbulent flame jet ignition source is formed, and a homogeneous thin mixed gas, formed through methanol and alcohol hydrogen jetted from interior of a gas inlet channel or a cylinder, in the cylinder is ignited. According to the invention, part of methanol fuel is converted into the alcohol hydrogen, the combustion organization method is adopted and is applied to the internal combustion engine, ignition reliability can be improved, the in-cylinder combustion process is accelerated, the antiknock property is improved, and the internal combustion engine adapts to higher compression ratios, so that thermalefficiency of the engine is improved, and hazard emission of nitrogen oxides, particles and the like is reduced. A modification experiment on a diesel engine of which the cylinder diameter is 210 mmshows that thermal efficiency is improved by 4%, emission of nitrogen oxides is reduced by 85%, and emission of particles is reduced by 95%.

Flowmeters are disclosed herein that include one or more flow path features for improving the measurement accuracy or other aspects of the flowmeter. In some embodiments, the flowmeter includes a measurement section having a non-circular transverse cross-section in which one or more sensors for measuring flow are disposed. The non-circular measurement section can reduce distortion of ultrasonic waves, facilitate chordal measurements with flush-mounted transducers, and reduce the propagation distance between paired transducers. In some embodiments, the flowmeter includes a conditioning section with diametrically opposed longitudinal rib protrusions. The protrusions can reduce swirling flow, direct liquid components of a multi-phase flow towards the sidewalls of the flow path, and guide ballistic particles through the center of the flow path away from sensitive measurement devices.

The invention relates to a duct type multi-rotor tethered drone and a control system thereof, belongs to the field of drones, and aims to solve the problems that existing drones are short in flight duration and prone to crash due to the fact that the rotors of the drones are exposed. The duct type multi-rotor tethered drone is characterized in that the an inner central pipe is connected with an outer duct pipe through a group of guide vanes, a group of carbon fiber pipes is fixedly mounted on the outer wall of the lateral side of a block formed by central plates, the middle section of each carbon fiber pipe is fixed with the wall of the duct pipe, and an auxiliary rotor is mounted at the tail end of each carbon fiber pipe through an auxiliary motor; a hardware control system is mounted onthe upper surface of the central plate block, a main motor is coaxially mounted on the lower surface of the central plate block, the main motor drives a main rotor, and a power supply system is arranged beside the main motor; the hardware control system is connected with the main motor, a group of auxiliary motors, the power supply system, a video collecting unit and an automatic pilot, and a tether is connected with the hardware control system, the main motor, the group of auxiliary motors and the video collecting unit through the power supply system. The duct type multi-rotor tethered dronecan constantly work around the clock.

Flowmeters are disclosed herein that include one or more flow path features for improving the measurement accuracy or other aspects of the flowmeter. In some embodiments, the flowmeter includes a measurement section having a non-circular transverse cross-section in which one or more sensors for measuring flow are disposed. The non-circular measurement section can reduce distortion of ultrasonic waves, facilitate chordal measurements with flush-mounted transducers, and reduce the propagation distance between paired transducers. In some embodiments, the flowmeter includes a conditioning section with diametrically opposed longitudinal rib protrusions. The protrusions can reduce swirling flow, direct liquid components of a multi-phase flow towards the sidewalls of the flow path, and guide ballistic particles through the center of the flow path away from sensitive measurement devices.

The invention discloses a vortex type ultraviolet sterilizer. The vortex type ultraviolet sterilizer comprises a shell (3) and an ultraviolet sterilizing lamp (12), wherein the ultraviolet sterilizinglamp (12) is located in the shell (3); the exterior of the ultraviolet sterilizing lamp (12) is sleeved by an ultraviolet-permeable quartz sleeve tube (4); a water passing channel (5) is formed between the shell (3) and the quartz sleeve tube (4); a plurality of flow guide plates (7) are arranged in the water passing channel (5); the outer edge of one side of each flow guide plate (7) is providedwith a flow guide opening (6) used for guiding a water flow to pass through; the flow guide openings (6) of every two adjacent flow guide plates (7) are located at different sides; and the inner wallof the shell (3) and/or the surface of each flow guide plate (7) are subjected to polishing treatment to form ultraviolet reflecting surfaces (8). Compared with a conventional ultraviolet sterilizer,the ultraviolet sterilizer provided by the invention increases the ultraviolet irradiance by 10% to 20%, and has better sterilizing effect.

The invention relates to a small and medium-size triangular rotor engine double oil injection system, in particular to a small and medium-size kerosene triangular rotor engine double-oil-injector injecting method, and belongs to the field of triangular rotor engines. The system simultaneously adopts two oil injectors to inject kerosene, the kerosene required in the combustion process is mainly supplied by a first oil injector, and a second oil injector injects a small amount of fuel oil and achieves an igniting effect. The injecting time and oil injecting amount of each oil injector can be precisely controlled, spot dividing injection and time sharing injection are achieved, the good atomization effect is achieved while the large power-mass ratio of a rotor engine is kept, reliable igniting is achieved, the problems that a kerosene rotor engine is poor in atomization, low in combustion efficiency and high in emission are solved, and the performance of the small and medium-size triangular rotor engine is improved.

The invention relates to the technical field of rail train communication, in particular to a rail train multiple-input-multiple-output wireless optical communication system. The system comprises a vehicle-mounted network unit and a signal box. At least two light receiving devices are arranged on the outer side of the top of each train compartment. An optical splitter and at least two light emitting devices are arranged on a cross arm of each overhead contact system hard crossing supporting column above the rail, a signal box is arranged on any overhead contact system hard crossing supporting column in every N overhead contact system hard crossing supporting columns, and a train-mounted network unit is arranged in a train carriage. According to the invention, the light beams emitted by thetwo light emitting devices on the cross arm of the same overhead line system hard cross strut carry the same data stream; the frequency spectrum utilization rate is doubled compared with a diversity mode, the light beams emitted by the light emitting devices on the cross arms of the different overhead line system hard crossing supporting columns carry different data streams, the wavelengths are different, and the problem of interference between wireless light beams is effectively solved.

The embodiment of the invention discloses a production method for an integrated cylinder cover, which includes the following steps that: aluminum alloy is selected; the aluminum alloy is forged into a blank; and an admission passage and an exhaust passage are machined on the blank. As shown in the technique scheme, since the aluminum alloy with high strength and high heat resistance is forged and machined into the cylinder cover, the cylinder cover can meet the mechanical requirements of a cylinder cover for racing cars, that is, the tensile strength is larger than 350MPa, the elongation is larger than 10 percent, and the rigidity HB is larger than 110. On the other hand, because a combustion chamber corresponds to two spark plug holes, when two spark plugs of the same type are mounted, the two spark plugs can simultaneously ignite, consequently, the transfer of flame in the combustion chamber is accelerated, the transfer distance of flame is shortened, and thereby fuel oil-mixed gas can rapidly burn in a short time and in a short distance in the combustion chamber. According to the energy conversion principle, when the mixed gas is compressed to a top dead center, the temperature of a mixer in the combustion chamber is high, so that the mixed gas can be instantly ignited and burnt out, and thereby the energy utilization rate can be greatly increased.

The invention discloses a high-ignition-point fuel compression ignition and combustion regulation and control device based on flame jet flow control. The high-ignition-point fuel compression ignition and combustion regulation and control device comprises a spark plug (1), a pre-combustion chamber ejector (2), a main combustion chamber ejector (3) and a pre-combustion chamber body (4). The pre-combustion chamber main body (4) is arranged on the main combustion chamber (6), a pre-combustion chamber cavity (5) is formed in the pre-combustion chamber main body (4), the pre-combustion chamber ejector (2) and the pre-combustion chamber spark plug (1) are installed at two different positions on one side of the pre-combustion chamber main body (4) respectively, and the head of the pre-combustion chamber ejector (2) and the head of the pre-combustion chamber spark plug (1) extend into the pre-combustion chamber cavity (5). The pre-combustion chamber cavity (5) is communicated with the main combustion chamber (6) through a spray hole; the main combustion chamber ejector (3) is fixed to the other side of the pre-combustion chamber body (4), and the head of the main combustion chamber ejector (3) extends into the main combustion chamber (6). The use performance of the low-carbon zero-carbon fuel can be effectively widened, and wide popularization and application are facilitated.

The invention aims to provide an engine capable of directly injecting natural gas for multiple times under high pressure in a cylinder and a layered rapid combustion method thereof. The engine comprises an air cylinder cover, an air cylinder wall, a piston, an air inlet channel, an air inlet valve, an exhaust channel, an exhaust valve, a high-pressure natural gas injection valve, a high-pressure natural gas supply pipeline and a spark plug, wherein the cylinder cover, the cylinder wall and the spark plug form a combustion chamber, the combustion chamber is hemispherical, the air inlet channel,the exhaust channel, the high-pressure natural gas injection valve, the high-pressure natural gas supply pipeline and the spark plug are arranged in the cylinder cover, the high-pressure natural gassupply pipeline is connected with the high-pressure natural gas injection valve, the air inlet valve is arranged in the air inlet channel, the exhaust valve is arranged in the exhaust channel, and thehigh-pressure natural gas injection valve is located between the air inlet channel and the spark plug. The engine is advantaged in that layered combustion of different gradients under different loadscan be achieved, the ignition stability of the natural gas engine is guaranteed, economical efficiency and dynamic property of the engine are effectively improved, and emission is reduced.

The embodiment of the invention discloses a complementary metal oxide image sensor, an image processing method and a storage medium. The CIS comprises a semiconductor substrate, a sub-wavelength pixelunit, and a reading circuit; the sub-wavelength pixel unit is arranged in the semiconductor substrate and is connected with the reading circuit; wherein the sub-wavelength pixel unit comprises n PD columns; N is an integer greater than or equal to 0; N size parameters corresponding to the n PD columns are determined by preset wavelengths; and the n PD columns absorb and convert the incident lightaccording to the preset wavelength to obtain an electric signal corresponding to the incident light.

The invention relates to a partial discharge positioning device and method for an ultra-long power distribution cable. The device comprises a pulse signal generator, an oscillating wave voltage generator and a signal receiving device which are arranged at the head end of the cable, and a plurality of capacitive sensors arranged on spaced cable joints, wherein the capacitive sensor comprises a coupling unit, a signal acquisition module and a 4G module, the coupling unit is composed of a high-voltage coupling capacitor and an RLC coupling circuit, signals acquired by the signal acquisition module are transmitted to the signal receiving device through the 4G module, the high-voltage coupling capacitor is pre-buried between a cable joint grounding copper net and an outer semi-conductive layer,and an external wire is connected in series with the RLC coupling circuit. According to the device and the method, the defects that pulse echoes are difficult to detect and positioning is greatly influenced due to the fact that the length of the cable is too long and partial discharge signals are attenuated seriously are effectively overcome.