12results about How to "Reduce structure noise" patented technology

The invention belongs to the field of reactors, and relates to a low-noise extra-high voltage shunt reactor which comprises an oil tank, an ascending flanged base and a cooling system, an oil tank composite noise reduction structure is mounted on the inner side of the wall of the oil tank, an oil tank outer noise reduction mechanism is mounted on the outer side of the wall of the oil tank, and a reactor body positioning damping structure is mounted on the lower portion of a reactor body. The iron core is installed in the oil tank, fourth pull screws are installed on the left side and the right side of the periphery of the iron yoke, fifth pull screws are installed on the upper side and the lower side of the periphery of the iron yoke, seventh pull screws are installed at the positions, close to the inclined seam of the iron yoke, of the two corners of the upper end of the inner periphery of the iron yoke, and first shock pads are installed between the fourth pull screws, the fifth pull screws and the seventh pull screws and the iron yoke. Insulating base plates and shock pads II are arranged between the upper cross beam, the upper pressing beam and the lower foot pad and the iron yoke; an insulating rubber plate with an L-shaped structure is arranged on the outer side of the iron yoke close to the inclined seam of the iron yoke; an insulating partition plate is installed between the insulating rubber plate and the iron yoke. The clamping force of the iron yoke is increased, the vibration of the iron core is reduced, the pull screw and the insulating rubber plate are additionally arranged at the inclined seam of the iron yoke, vibration is reduced, and meanwhile noise transmission is blocked.

The invention discloses a portable X-ray machine for measuring osteoporosis, and relates to the technical field of medical equipment.The X-ray machine adopts 18-26 V wide-range low-voltage power supply, primary boosting is performed through a full-bridge inverter circuit and a high-voltage transformer, secondary boosting is performed through a single-side CW voltage doubling rectifying circuit, the output voltage ranges from 30 kV to 80 kV, and the tube current ranges from 0.1 mA to 1 mA. A pseudo dual-energy imaging technology is introduced, low-energy and high-energy X-rays are used for imaging respectively, artifacts are reduced through continuous multi-image taking and contrast synthesis, and the imaging quality is improved. And the overexposure risk of the CCD camera is reduced by adopting an accurate dose control and delayed exposure technology. And a glue sealing insulation design and a split type structure are adopted, so that the equipment volume is reduced, and the portability is improved. Through integration of multiple technologies, the portable X-ray machine which is efficient, safe, capable of reducing measurement errors and radiation cost is provided, and the portable X-ray machine is suitable for osteoporosis detection.

The application discloses a kind of acoustic submersible multi-stage linkage flexible suspension design method and acoustic submersible, it is related to marine observation and underwater acoustic technical field, comprising the following steps: planning the layout and relative position relationship of vector and scalar sensing unit in acoustic submersible system;For vector and scalar sensing unit, the elastic body connection architecture of multi-stage linkage flexible suspension system is designed, and the vertical and horizontal elastic body connection mode is planned respectively.The application sets up vertical and horizontal elastic body connection to vector channel and scalar channel respectively by multi-stage linkage flexible suspension architecture, and further suspends sensing unit frame in the internal frame of submersible main body, forms multi-stage vibration isolation system, can effectively absorb and attenuate the structural vibration energy transmitted by the swing of submersible main body caused by current impact, reduces structural noise from the source, significantly improves the purity and detection capability of acoustic signal acquisition.

The present invention relates to the technical field of key automotive parts, specifically a bearing bushing mechanism and its assembly process for steering system noise reduction, comprising a bushing body and a fluid, wherein the bushing body comprises an outer ring wall, an inner ring wall, an inlet, a one-way valve, a convex bulge, and a side convex bulge, wherein the inner ring wall is provided with a convex bulge and a side convex bulge, and a cavity structure is provided between the outer ring wall, the inner ring wall, the convex bulge, and the side convex bulge, wherein a fluid is injected into the cavity structure, the cavity structure is connected to the inlet, a one-way valve is provided in the inlet, the outer ring wall is interference-fitted with the housing of the reduction mechanism, and the inner ring wall is sleeved outside the bearing of the worm. Compared with the prior art, when the bearing changes in different positions, the fluid flows correspondingly in the cavity structure, thereby improving the damping and nonlinear stiffness, realizing the gap compensation, ensuring the better performance of the reduction mechanism, and reducing the structural noise itself. The present invention has the advantages of simple structure, low manufacturing cost, and easy disassembly and assembly.

The application discloses a kind of acoustic submersible multi-stage linkage flexible suspension design method and acoustic submersible, it is related to marine observation and underwater acoustic technical field, comprising the following steps: planning the layout and relative position relationship of vector and scalar sensing unit in acoustic submersible system;For vector and scalar sensing unit, the elastic body connection architecture of multi-stage linkage flexible suspension system is designed, and the vertical and horizontal elastic body connection mode is planned respectively.The application sets up vertical and horizontal elastic body connection to vector channel and scalar channel respectively by multi-stage linkage flexible suspension architecture, and further suspends sensing unit frame in the internal frame of submersible main body, forms multi-stage vibration isolation system, can effectively absorb and attenuate the structural vibration energy transmitted by the swing of submersible main body caused by current impact, reduces structural noise from the source, significantly improves the purity and detection capability of acoustic signal acquisition.

The utility model relates to the technical field of material conveying equipment, in particular to wind power feeding automatic control equipment with a noise reduction function, which comprises a feeding box, a feeding pipe, a control system, a sound absorption plate, a shock absorption seat and a shock absorption device, one side of the feeding box is connected with the feeding pipe through a flange plate, the top end of the feeding pipe is connected with a feeding pipe, and the top end of the feeding pipe is connected with a discharging pipe. A machine box is installed in the feeding box, a motor is installed in the machine box, the output end of the motor penetrates through the machine box and is provided with a fan and a silencer so as to reduce noise generated during operation of the motor, a sound absorption plate is made of materials and structures capable of absorbing sound, and a plurality of small holes are formed in the surface of the sound absorption plate. Due to the fact that a part of energy can be reflected by noise sound waves generated by the device in the transmission process, a part of energy can be absorbed at the same time, noise generated by the device is reduced to the maximum extent, sound energy generated by noise transmission can be effectively reduced, the sound absorption effect is achieved, and the device can achieve the noise reduction function.

The utility model discloses a beam -slab integrated pre -installed floor support plate structure suitable for secondary decoration belongs to the technical field of fabricated building. The floor support plate structure includes the bending plate, the hanging muscle, the main keel sub -assembly, the secondary keel, the sound absorption layer, the base plate layer, the noise reduction layer, the leveling layer and the sound absorption dust layer. Among them, the bending plate of section is the channel type structure and opens downward, and the bottom is connected through the end face hanging muscle, and the upper portion is fixedly connected with the base plate layer. The noise reduction layer and the leveling layer are fixedly connected above the base plate layer. The bottom of hanging muscle is connected with the secondary keel through the main keel sub -assembly. The bottom of secondary keel is connected with the sound absorption dust layer and forms the load -bearing structure for installing the sound absorption layer. The floor support plate structure is provided with the cavity and is convenient for wiring and installs various pipelines, and is suitable for secondary decoration. Meanwhile, the point contact is changed from the hard surface contact between the adjacent bending plate, and the middle is filled with the flexible sound insulation sealing material, and the structure abnormal sound produced due to thermal expansion and cold shrinkage can be effectively reduced.

The invention relates to a camera arrangement, in particular a camera arrangement for a vehicle, having a movably mounted camera unit which can be moved between a passive position and an active position, characterized by a cable system which is attached to the camera unit and which is operatively connected to a cable winch which can be rotated about a rotation axis.

The present invention relates to a low-vibration high-frequency modal vehicle body structure, comprising a vehicle body base plate (1), a modal adjustment rib (2), and a composite damping layer (3), wherein the modal adjustment rib (2) is arranged on the vehicle body base plate (1) according to the modal adjustment stiffness and position, and is rigidly connected to the vehicle body base plate (1); the composite damping layer (3) is composed of a sound absorbing layer (4), a constraint layer (5), a damping layer (6), and a bonding layer (7) from the outside to the inside, wherein the bonding layer (7) is bonded to the vehicle body base plate (1). Compared with the prior art, the present invention fully considers the structural vibration of the vehicle and the structural noise characteristics caused by the vibration and the frequency effectiveness of damping vibration reduction and noise reduction control, and proposes a low-vibration high-frequency modal vehicle body structure that can effectively reduce structural noise based on the structural characteristics of various types of special vehicles.

The utility model discloses a kind of muffler air inlet pipe connecting frame, relate to agricultural machinery technical field.The muffler air inlet pipe connecting frame, including base, the base upper fixedly connected with engine, engine side surface fixedly installed with support frame, support frame is fixedly installed with shell, shell upper and lower sides are fixedly installed with air outlet pipe and air inlet pipe and with shell interior intercommunication, engine side surface is equipped with exhaust port, support frame lower side fixedly connected with pipe support, fixedly installed with rubber pad between pipe support and air inlet pipe;Support frame front end lower side fixedly installed with shock-absorbing rod.The muffler air inlet pipe connecting frame, the shock-absorbing spring of the muffler air inlet pipe connecting frame's connecting support frame installation can effectively attenuate low-frequency vibration generated when engine operates, through elastic deformation absorption vibration energy, reduce the vibration transmission caused by rigid connection, avoid the problem that weld point cracks, component loosening etc.

The utility model provides a riveting positioning device for battery support, including fixed plate, two mounting plates, two elastic support mechanisms and 4 adjustable positioning mechanisms, two mounting plates symmetry sets up in the left and right sides of fixed plate, two elastic support mechanisms symmetry sets up in the upper end surface of fixed plate, and elastic support mechanism is used for supporting the bottom or top end surface of battery support, 4 adjustable positioning mechanisms all set up in the upper end surface of fixed plate, 4 adjustable positioning mechanisms symmetry sets up between two elastic support mechanisms, and adjustable positioning mechanism can cooperate with the hole position of battery support, the utility model discloses a riveting positioning device for battery support has solved the problem that the key components such as positioning pin, fixed rod are caused due to the long -term use of riveting positioning device and lead to the mechanical wear and tear, and the precision deviation is easy to appear to exceed the tolerance limit value, and then leads to the problem of riveting hole position misplacement, battery pack installation failure.

The invention relates to a brake resistor having a single flat sheet, the respective single flat sheet having a first transverse slot and a second transverse slot which are arranged one behind the other in the longitudinal direction and are spaced apart from one another, the first transverse slot protruding into the single flat sheet from the right edge of the respective single flat sheet, viewed in the longitudinal direction, and the second transverse slot protruding into the single flat sheet from the right edge of the respective single flat sheet, viewed in the longitudinal direction, the first and second transverse slots extend into the respective single flat sheet from the left edge of the respective single flat sheet, viewed in the longitudinal direction, and the first and second transverse slots are arranged one after the other, respectively, alternately, viewed in the longitudinal direction.