67results about How to "Not easy to resonate" patented technology

The invention discloses a power frequency transformer-free three-phase-single-phase voltage transformation device. According to the three-phase-single-phase voltage transformation device, a single-phase-single-phase converter multi-module cascade structure is adopted to withstand three-phase power grid high-voltage; single-phase-single-phase converters at three phases are in cascade connection with one another and then are connected with in series with each other, so as to realize output, and therefore, a power frequency transformer can be omitted, and the three phase-single-phase voltage transformation device can be directly connected with a single-phase power supply network, and output voltage level can be improved; the single-phase-single-phase converter is mainly composed of a rectifying circuit, a bidirectional DC-DC conversion circuit and an inversion circuit. The single-phase-single-phase converters of the voltage transformation device are simple in structure, and therefore, the structure of the system can be greatly simplified, and two-way flow of the power of a three-phase power grid and a single-phase power supply network can be realized, and energy transmission efficiency can be improved, and thus, unbalance of the three-phase power grid can be avoided; and the converters can have reactive power and harmonic compensation functions through selecting proper control strategies, and therefore, electric energy quality of the three-phase power grid side can be improved, and reactive power and harmonic can be compensated for the single-phase power supply network.

The invention relates to the technical field of civil engineering, in particular to a shock isolation support with a servo shock isolation system. The shock isolation support with the servo shock isolation system comprises a laminated rubber support, wherein a support protective sleeve is arranged on the outer surface of the laminated rubber support in a sleeving manner; an upper flange plate is connected to the upper end of the laminated rubber support through connecting bolts, and a lower flange plate is connected to the lower end of the laminated rubber support through connecting bolts; an upper cover plate is fixedly connected to the upper surface of the upper flange plate; and a servo control system for enabling the shock isolation support with the servo shock isolation system to perform adaptive adjustment is mounted on the lower flange plate. The shock isolation support with the servo shock isolation system disclosed by the invention is simple in structure; a feedback control technology is introduced, so that the driving optimal feedback control of the shock isolation system is realized; the shock isolation support has an adaptive adjustment mechanism, so that different control targets can be realized; and the shock isolation support has an effective frequency bandwidth and an advantage of being not liable to resonate with a control structure, the mechanical stability and the electromechanical performance stability of the system can be realized, and the shock insulation requirements of engineering structures having special shock insulation requirements, mechanical equipment, valuable articles and the like can be met by the shock isolation support.

This invention discloses a resin concrete, which is composed of: aggregate 71-86 wt.%, filler 3-12 wt.%, reinforcing material 3-8 wt.%, and binding material 7-11 wt.%. the resin concrete is manufactured by: (1) mixing epoxy resin, curing agent and fly ashes, and uniformly stirring; (2) adding stone and glass fiber, and stirring; (3) mounting the mold onto a vibration desk; (4) injecting the mixture into the mold with vibrating; (5) standing for 7 d, and demolding. The resin concrete has such advantages as high impact strength, high cracking resistance and reasonable aggregate particle sizes.

The invention discloses a high-impact piezoelectric accelerometer. The high-impact piezoelectric accelerometer comprises a hollow installing seat, a core is arranged in the hollow installing seat through a compressing ring in a press fit mode and is connected with a cable through a plug, one shock insulation cushion and one insulating cushion are arranged between one end of the core and the compressing ring, and another shock insulation cushion and another insulating cushion are arranged between the other end of the core and the installing seat. Because the shock insulation cushions large in damping are installed at the two ends of the core of the piezoelectric accelerometer, high-frequency large-amplitude acceleration generated by strong-impact waves on a structure can be filtered out, and transverse acceleration transmitted to an acceleration sensor can be reduced so as to achieve the purpose of reducing zero drift. Due to the adoption of a base strain isolation type structure, strain of sensitive elements can be effectively reduced; because the insulating cushions are arranged at the two ends of the core and serve as isolators, the accelerometer can be isolated from an installing face mechanically so that effective strain transmitted to the accelerometer can be reduced and the purpose of reducing zero drift can be achieved.

The invention discloses a modular space truss structure deep sea net cage. The cage is characterized in that: a net cage frame is of a full-closed cage-shaped space truss structure, is constructed andexpanded in a modular mode through truss nodes and truss rod pieces, is a multi-layer truss in the internal and external direction and comprises a buoyancy adjustable layer and a buoyancy non-adjustable layer; each truss node comprises a buoyancy adjustable node and a buoyancy non-adjustable mechanical node, the buoyancy adjustable node is a thin-wall hollow shell which is expanded relative to the truss rod piece and is used for generating buoyancy required by the modular space truss structure deep sea net cage in work and used for adjusting the snorkeling, the bearing capacity and the underwater posture of the modular space truss structure deep sea net cage; and the breeding net is a totally-closed breeding net. A multi-layer totally-closed cage-shaped space dense truss structure comprising the buoyancy adjustable layer and the buoyancy non-adjustable layer is adopted as a modular structure main body of the deep sea net cage, and the two prominent problems of stormy wave resistance and benefit generation in deep sea cultivation are solved.

The invention discloses a high-rotating-speed motor and an assembling method thereof. The high-rotating-speed motor comprises a machine shell, a rotating shaft and a bearing sleeve, wherein the machine shell is of an annular structure with the left end and the right end open, an installation ring coaxial with the machine shell is arranged in the machine shell, the outer diameter of the installation ring is smaller than the inner diameter of the machine shell, the length of the installation ring in the left-right direction is smaller than the length of the machine shell in the left-right direction, a plurality of air guide pieces are evenly distributed between the installation ring and the inner wall of the machine shell, a stator installation cavity and a bearing installation cavity are sequentially formed in the installation ring from left to right; an annular protruding part is arranged in the middle of a stator installation cavity of the installation ring, the outer wall of the right portion of the bearing sleeve is matched with the inner wall of the left portion of the machine shell, the outer wall of the right portion of the bearing sleeve is inserted into the inner wall of the left portion of the machine shell, the rotating shaft is inserted into the bearing sleeve and the machine shell in the left-right direction, the middle of the rotating shaft is sleeved with a magnetic ring, and a stator assembly is mounted in the stator mounting cavity. The high-rotating-speed motor has the advantages of being not prone to resonance, low in noise and the like.

The invention discloses a rotating speed detection device and system of a shaft to be measured. The device includes a signal toothed disc and a connection support for being installed on the end surface of the shaft to be measured, a transmission shaft coaxially arranged with the shaft to be measured is formed on the connection support, the signal toothed disc is installed on the transmission shaft, and the device also includes The sensor fixing frame is installed on the transmission shaft through bearings, and a speed sensor for detecting the speed signal of the signal toothed disk is installed on the sensor fixed frame, and the sensing end of the speed sensor is opposite to the tooth part of the signal toothed disk. The coaxial installation of the sensor fixing frame and the signal gear plate can ensure the synchronous oscillation of the two during the test, avoid the interference of other background vibrations, and improve the accuracy of the test results. The overall design of the signal chainring, bearings, sensor fixing frame, and connecting support is solidified into a component type, which is not only ingenious in design, but also easy to install and adjust, so that it can be installed in place at one time, has strong versatility, is easy to use, and is reliable.

The invention relates to the technical field of wind turbine generators, in particular to a vortex-induced vibration suppression device, a blade assembly and a wind turbine generator. The vortex-induced vibration suppression device comprises a turbulent flow sleeve, the cross sectional area of the turbulent flow sleeve is gradually reduced from one end to the other end, and the turbulent flow sleeve is used for wrapping the tip of the blade. The blade assembly comprises the vortex-induced vibration suppression device. The wind turbine generator comprises the blade assembly. According to the vortex-induced vibration suppression device, the blade assembly and the wind turbine generator provided by the invention, the problem of resonance of the blade caused by vortex-induced vibration can be relieved to a great extent, so that the blade is not easy to damage due to serious swinging; in addition, the turbulent flow sleeve is convenient to put on and take off.

The invention belongs to the field of cooling-water machines, and particularly relates to a water-cooled cooling-water machine. The water-cooled cooling-water machine comprises a refrigeration cycle,a condenser water-cooled heat dissipation cycle and an evaporator cold water control cycle, an expansion valve in the refrigeration cycle comprises a valve shell, an ejector rod A, a diaphragm, a sealing cover, an ejector rod B and the like, and a fixed block A is mounted between an accommodating groove C used for accommodating a refrigerant in the valve shell and a through groove for distributionthe refrigerant. In the initial starting time period of the cooling-water machine, the pressure change of the refrigerant in the containing groove C15 is small, and therefore the moving speed generated when the diaphragm drives the ejector rod A, the ejector rod B and other moving parts is low due to the fact that the pressure difference is generated between the two sides of the diaphragm; and the vibration frequency of the ejector rod A and the ejector rod B in the initial starting time period of the water cooling machine is reduced, so that the ejector rod A and the ejector rod B do not generate a howling phenomenon caused by rapid movement and resetting in a short time.