33results about How to "To achieve the effect of sound insulation" patented technology

The invention discloses a thermal insulation, sound insulation and environmental protection solid wood composite door, which relates to the technical field of production and processing of solid wood composite doors. In order to solve the problem of sound insulation of the existing solid wood composite doors, a bridge cavity mechanical plate is generally used for sound insulation, but the noise decibel is as high as When it is fifty decibels and above, its sound insulation effect begins to show obvious deficiencies, and we need to strengthen it. The inside of the solid wood composite door body is provided with a solid wood keel board, and the outer walls of the upper and lower ends of the solid wood keel board are provided with high-density boards, and the high-density board is fixedly connected with the solid wood keel board, and the outer wall of the high-density board is provided with There is a solid wood cortex, and the solid wood cortex is fixedly connected with the high-density board, and the inner wall of the high-density board is provided with noise reduction through holes, and the noise reduction through holes are fixedly connected with the high density board, and there are several noise reduction through holes. A sound-absorbing sponge body is arranged inside the noise-reduction through hole, and the sound-absorbing sponge body is fixedly connected with the noise-reduction through hole.

The invention belongs to the field of applied geophysical exploration / acoustic logging, and particularly relates to an acoustic logging-while-drilling device of a variable-diameter sound insulation structure. The acoustic logging-while-drilling device of the variable-diameter sound insulation structure comprises drill collars, a sound wave transmitting device and a sound wave receiving device are arranged outside the drill collars, and the acoustic logging-while-drilling device is characterized in that a variable-diameter sound insulator is arranged between the sound wave transmitting device and the sound wave receiving device, and the drill collars comprise a drill collar with a first inner diameter and a first length, a drill collar with a second inner diameter and a second length, a drill collar with a third inner diameter and a third length and a drill collar with a fourth inner diameter and a fourth length from the transmitting device to the receiving device. The acoustic logging-while-drilling device lowers processing difficulty and cost, and meanwhile enhances the mechanical strength of the drill collars. Energy transfer between an energy converter and the drill collars is structurally obstructed, and the variable-diameter sound insulator is combined to further eliminate the interference of the drill collars to stratum signals.

The invention belongs to the field of marine engineering vibration and noise, and provides a polygonal double-layer frame airbag underwater piling noise reduction and dustproof device, which includes an external air compressor, an airbag, and inner and outer steel horizontal and vertical support rods. Double-layer frame, the inner and outer frames are respectively connected by horizontal and vertical struts through pipe clips, and are arranged in regular polygons in the circumferential direction of the pile foundation according to the construction arrangement. The inner and outer frames are connected by horizontal struts through tube clips. The air bag is arranged between the inner and outer frames, and the frame is connected with the frame through a prefabricated lock on the air bag, and the external air compressor is connected with the upper part of the air bag. The invention has simple structure, is stable and durable, can be flexibly combined, disassembled and assembled for many times, has designability, and has good sound absorption and noise reduction effect. Helps maintain ecosystem balance.

The invention belongs to the field of applied geophysics / acoustic logging and relates to an optimized design method of a reducing sonic system sound insulator of an acoustic logging-while-drilling drill collar. The optimized design method of the reducing sonic system sound insulator of the acoustic logging-while-drilling drill collar comprises the following steps of: step 1, determining an optimal sound insulation resistance band frequency range of the sound insulator and an inner diameter of a water hole according to the design requirement; step 2, establishing a target function of the inner diameter of a reducing position of the drill collar, solving an overall situation minimal value of the target function and determining the optimized inner diameter; and step 3, further adjusting the combination of reducing lengths and establishing a target function; and solving an overall situation minimal value of the target function and determining the optimized combination of the reducing lengths. According to the optimized design method disclosed by the invention, the machining difficulty and cost are reduced and the mechanical strength of the drill collar is enhanced; the problems that a sound insulation effect of an etching groove sound insulator is controlled by a plurality of parameters including a groove width, a groove depth, a groove distance, the quantity of etching grooves and the like, the method only can be designed by experiences and a numerical simulation method and an optimize etching groove structure is difficult to find can be avoided.