10 results about "Noise strength" patented technology

The invention provides a compressor frequency mute adjusting method and system based on heating rate feedback. The method comprises the steps that a state input vector is constructed; a temperature difference target is calculated according to the current water inlet temperature of the target compressor, and whether the heating effect is effective or not after frequency change is recognized; through dynamic coupling of the noise intensity and the thermal path response impedance, a hearing feeling scoring model containing a frequency penalty term and a trend correction term is constructed, and a hearing feeling score and a hearing feeling risk increment are generated; performing weighted fusion on the thermal path response impedance and the hearing score to obtain a frequency modulation tendency score and a frequency adjustment instruction; and the frequency adjusting instruction is applied to actual equipment, and operation execution of variable-frequency adjustment and mute adjustment of the compressor is completed. The technical defect that in an existing method, the heating effectiveness and the noise comfort cannot be judged at the same time is overcome.

The invention provides a trapped person position state analysis method and system, and relates to the field of data processing. According to the method, building structure distribution, conductive fluid flow channels and metal component distribution in a disaster target area are constructed to form a background entropy flow ground state, and noise intensity probability distribution, a channel joint fluctuation relation and a time stability index are counted to generate a background entropy flow field. In the search and rescue stage, a background entropy flow field is converted into a controlled mode through active disturbance, multi-physical channel noise responses before and after disturbance are collected through a multi-field passive sensor network, and a multi-dimensional local entropy response vector is constructed. And combining the consistency, directivity and duration of the multi-noise channel to identify an initial suspected region and extract an entropy anomaly core region, finally inferring metabolic activity and posture limitation conditions according to a local entropy response cooperative relationship in different disturbance modes, and outputting a position state result of the trapped person. By implementing the technical scheme provided by the invention, the position state of the trapped person can be accurately identified.

The invention discloses a noise reduction control method and system for a seat and the seat, and the noise reduction control method for the seat comprises the steps that after a user sits on the seat, environment noise is obtained; obtaining noise intensity according to the environment noise; judging whether the noise intensity is greater than a noise reduction limit value; and if the noise intensity is greater than a noise reduction limit value, starting an active noise reduction mode of the seat so as to carry out noise reduction treatment on the environmental noise. By adopting the seat, a local relatively quiet space can be constructed under the condition that others are not interfered through the seat, the user privacy is protected, meanwhile, the interference of noise to the user and surrounding people can be reduced, and the use experience of the seat is effectively improved.

This invention discloses a silencing device for a Roots blower, comprising a silencing mechanism. The silencing mechanism includes a first chamber shell, the interior of which is uniformly provided with a plurality of honeycomb channels. A ventilation cavity is provided on the inner wall of the first chamber shell, and a plurality of connecting pipes are fixedly connected to the inner wall of the ventilation cavity. A first pipe is fixedly connected to the side of the connecting pipes away from the honeycomb channels. This invention improves the silencing effect of the device by combining the honeycomb channels and connecting pipes. When airflow enters the honeycomb channels, the different flow directions cause frequency interaction and cancellation, weakening the noise intensity. Furthermore, because the walls of the honeycomb channels are thin, the frequencies between six adjacent honeycomb channels easily cancel each other out, thus continuously reducing sound wave energy and achieving continuous silencing.

The application provides a trapped personnel position state analysis method and system, and relates to the field of data processing. In the method, a background entropy flow base state is formed by constructing the building structure distribution, conductive fluid flow channel and metal component distribution in the disaster target area, and a background entropy flow field is generated by statistically analyzing the noise strength probability distribution, channel joint fluctuation relationship and time stability index. In the search and rescue stage, the background entropy flow field is converted to a controlled mode by active disturbance, and the multi-physical channel noise response before and after the disturbance is collected by relying on a multi-field passive sensing network to construct a multi-dimensional local entropy response vector. The initial suspected area is identified and the entropy anomaly core area is extracted by combining the consistency, directionality and duration of multiple noise channels. Finally, the metabolic activity and posture restriction condition are inferred according to the local entropy response coordination relationship under different disturbance modes, and the trapped personnel position state result is output. The technical solution provided by the application is convenient for accurately identifying the position state of trapped personnel.

The utility model discloses a noise reduction ventilation structure of a soundproof room, which relates to the technical field of soundproof rooms and comprises a soundproof room, the soundproof room comprises an external wall panel, an air inlet is arranged at the top end of the right side of the external wall panel, an air outlet is arranged at the bottom end of the left side of the external wall panel, and a ventilation pipeline is fixedly mounted at the input end of the air inlet. And a mute air bellow is fixedly mounted at the other end of the ventilation pipeline. According to the utility model, the sound-absorbing cotton is arranged to absorb noise when airflow enters the ventilating duct, and airflow surging is reflected and interfered under the action of the plurality of baffles and the rubber pads, so that sound energy is reduced, and noise reduction is achieved; the conical noise reduction plate is matched to change the sound transmission direction, disperse sound energy and reduce the noise intensity in a special shape, the sound absorption holes enable sound waves to rub in the holes and convert and absorb the sound energy through a porous structure, and various kinds of noise are further effectively weakened through cooperation of the two.

The utility model discloses a silencing assembly and electrical equipment, and belongs to the technical field of noise reduction, and the silencing assembly comprises a fan cover which is provided with an air duct, the air duct comprises a first silencing section and a second silencing section which are arranged in the first direction and communicate with each other, and the first direction is the extension direction of the air duct; the first partition plate is arranged on the first silencing section and extends in the first direction, the length of the first partition plate in the first direction is smaller than that of the air duct in the first direction, the first silencing section is divided into a plurality of sub-channels by the first partition plate, and the sectional area of each sub-channel is smaller than that of the second silencing section; the section mutation is formed at the junction of the sub-channel and the second silencing section, so that sound waves are reflected at the section mutation position, and the reflection can cause energy dispersion and attenuation of the sound waves, so that the noise intensity is attenuated, and the interference to the surrounding environment of equipment is reduced; the windward area of the first partition plate can be reduced to a large extent, and blocking of airflow in the air duct is weakened.

An airflow assembly and an energy storage device. The airflow assembly comprises a first flow-through member, a second flow-through member, and a partition assembly. The first flow-through member is provided with a first flow-through opening. The second flow-through member is connected to the first flow-through member and a flow-through cavity is formed therebetween. The partition assembly is disposed between the first flow-through member and the second flow-through member, and divides the flow-through cavity into a first flow-through cavity and a second flow-through cavity arranged side by side. The first flow-through opening is communicated with the first flow-through cavity; the partition assembly is provided with a second flow-through opening, and the second flow-through opening is communicated with the second flow-through cavity; and external air is split when flowing through the airflow assembly, and flows out of the airflow assembly via the first flow-through cavity and the second flow-through cavity, respectively. The partition assembly divides the flow-through cavity into multiple spaces. When noise propagates in the airflow assembly, sound waves of the noise experience impedance mismatch due to sudden spatial changes, such that the sound waves of the noise are reflected continuously, causing the noise intensity to attenuate, thereby achieving a noise reduction effect.

The utility model relates to mould technical field especially elevator door hanging plate processing mould, including box and mould, the box is linked with mould surface sliding through the chute of inside surface opening and sliding, the box surface is equipped with mould replacement device, the box surface fixed link has the shell, the shell penetrates the box surface, the shell surface is equipped with the noise reduction adjusting device, this elevator door hanging plate processing mould, through the cooperation of noise reduction adjusting device and box, the extension of telescopic end of hydraulic cylinder drives the stamping block and mould cooperation to the elevator door hanging plate raw material and processes, the noise produced when stamping can be blocked by the sound insulation cotton layer inside the box and the baffle, reduce the noise intensity that transmits to the outside world, the noise produced when processing can be reduced through the relative sealing of the baffle to the box, the influence of the operating personnel health can be reduced.

The utility model provides sound insulation and noise reduction composite glass. The sound insulation and noise reduction composite glass comprises a first glass unit, a second glass unit and an outer frame, a first mounting groove, a second mounting groove and a clamping block are arranged on the inner side of the outer frame; the first glass unit comprises a first glass slide, a first damping glue layer and a second glass slide which are sequentially overlapped, the end part of the first glass unit is matched and connected with the first mounting groove, the second glass slide is positioned on one side relatively close to the second glass unit, and the thickness of the second glass slide is smaller than that of the first glass slide; the second glass unit comprises a third slide, the thickness of the third slide is greater than that of the second slide, and the end part of the second glass unit is matched and connected with the second mounting groove; a hollow inner cavity is formed between the first glass unit and the second glass unit. According to the utility model, the noise intensity is reduced through the damping glue layer and the hollow inner cavity, and the resonance phenomenon is avoided by designing the thickness of the slide, so that better sound insulation and noise reduction effects are realized.