121results about How to "Play a role in noise reduction" patented technology

The invention discloses a speech-emotion recognition method based on improved fuzzy vector quantization. The method extends the sum of fuzzy membership function from one to N so as to reduce the influence of sample wild-point on an iteration-training process to a certain extent, and adopts a clustering method based on similarity threshold and a minimum distance principle in the iteration-training process so as to avoid the problem that a clustering center is sensitive to initial values and easy to fall into local minimum values to a certain extent. Experimental results prove that the method can effectively improve the emotion recognition rate of the prior fuzzy vector quantization method.

The invention discloses a blind window opened and closed through temperature control and an engine compartment structure.The blind window opened and closed through temperature control comprises a blind window body and is characterized by further comprising a temperature control device for controlling the opening angle of the blind window body, the temperature control device comprises a rotating mechanism connected with the blind window body, the rotating mechanism is provided with a cross bar, one end of the cross bar is provided with a rotatable first paraffin tube, the other end of the cross bar is provided with a rotatable second paraffin tube, the first paraffin tube and the second paraffin tube are located at the two sides of the cross bar respectively, the first paraffin tube is provided with a piston ball bar in contact with the cross bar, the second paraffin tube is provided with a return spring in contact with the cross bar, and the temperature control device is further provided with an air inlet pipe and an air outlet pipe which are connected with pipelines of an intercooler respectively.The blind window can be opened or closed automatically according to the temperature, thereby it is guaranteed that the indoor temperature of an engine compartment is within the reasonable range, and therefore the overall efficiency can be improved.

The invention discloses a speech-emotion recognition method based on improved quadratic discriminant. By utilizing the method, false recognition rate caused by probability distribution diversity of emotional characteristic parameter statistics can be effectively reduced. The method comprises the steps of performing exponential transformation on characteristic parameters to enable parameter distribution after transformation to be near normalized, estimating probability distribution functions of original characteristics on the premise of subjecting transformed parameters to normal distribution, and using a logarithmic form to obtain improved quadratic discriminant. Compared with the prior other characteristic normalization transformation, the exponential transformation adopted by the method can more effectively normalize the characteristic parameters, and recognition rate can be effectively improved by adopting the improved quadratic discriminant.

The invention discloses an air outlet size adjustable vertical air purifier. The vertical air purifier comprises a shell. The shell is internally provided with an air inlet part, a draught fan part and an air outlet part from bottom to top in sequence. The top of the shell is provided with an opening. The opening is covered with an air outlet cover plate. The air outlet cover plate can ascend anddescend to the original position. When the air outlet cover plate ascends, the lower portion of the air outlet cover plate and the opening of the top of the shell form an air outlet. The air outlet becomes larger or smaller along with ascending of the air outlet cover plate. The air outlet size adjustable vertical air purifier has the advantages that the size of the air outlet is adjustable, and the vertical air purifier is capable of saving energy and reducing noise, convenient to use and high in purifying efficiency.

The invention discloses a ground test tail gas heat recycling and silencing tower for an aero-engine. The ground test tail gas heat recycling and silencing tower comprises a gas exhaust injection barrel, a heat-insulation soundproof chamber, a gas exhaust tower, a heat exchanger and a silencing device. The ground test tail gas heat recycling and silencing tower is characterized in that the heat-insulation soundproof chamber is a building, wherein the outer layer of the building is a brick-concrete structure, and the inner layer of the building is a heat-insulation soundproof material; the gas exhaust tower is a building which is of a high-temperature-resistant brick and concrete structure; the heat-insulation soundproof chamber is connected to the gas exhaust tower; the high-temperature-resistant gas exhaust injection barrel made of a metal material passes through the heat-insulation soundproof chamber, and is communicated with the gas exhaust tower; the upper part of the gas exhaust tower is provided with a silencing device which consists of metal silencing plates; the lower part of the gas exhaust tower is provided with a heat exchanger; and the heat exchanger consists of metal pipelines with good heat conduction functions. The ground test tail gas heat recycling and silencing tower disclosed by the invention can be used for recycling and utilizing energy in the high-temperature tail gas of the aero-engine, and also can achieve certain noise reduction effect, is simple in device, and is less in investment.

The invention discloses a multifunctional composite pipe silencer which comprises an exhaust barrel body, an expansion pressure-reduction device, a temperature-reducing energy-absorbing device, a frequency modulation and sound absorption device, a low-frequency sound elimination device, a high-frequency sound elimination device and a sound baffle device. The expansion pressure-reduction device, the temperature-reducing energy-absorbing device, the frequency modulation and sound absorption device, the low-frequency sound elimination device, the high-frequency sound elimination device and the sound baffle device are located in the cavity of the exhaust barrel body. A plurality of air through holes are formed in the peripheral face of the expansion pressure-reduction device. The temperature-reducing energy-absorbing device comprises a cooling liquid circulating chamber with a ventilation cavity and a cooling liquid coil arranged in the ventilation cavity, wherein the cooling liquid coil is filled with cooling liquid. The frequency modulation and sound absorption device comprises a plurality of air guide barrels, wherein air guide holes are distributed in the peripheral faces of the air guide barrels. The low-frequency sound elimination device comprises a plurality of single low-frequency sound elimination bodies. The high-frequency sound elimination device comprises a plurality of single high-frequency sound elimination bodies located among the adjacent single low-frequency sound elimination bodies, wherein the cross sections of the single high-frequency sound elimination bodies are V-shaped. The sound baffle device comprises a plurality of single sound baffle bodies located between two adjacent single high-frequency sound elimination bodies, wherein sound absorption layers are arranged in the sound baffle bodies. The multifunctional composite pipe silencer can reduce hot air flows and noise pollution of a fan or a chimney pipeline during exhausting.

The invention discloses a decoration material cutting machine, and belongs to the technical field of construction machinery. The decoration material cutting machine comprises a supporting bottom plate, a supporting top plate is arranged above the supporting bottom plate, a support is arranged at the joint between the supporting bottom plate and the supporting top plate, a hydraulic cylinder is arranged in the middle of the supporting top plate in a penetrating mode, a first supporting plate is arranged below the hydraulic cylinder, a dust cover is arranged at the joint between the first supporting plate and the hydraulic cylinder, a driving motor is arranged at one end of the upper surface of the first supporting plate, and a cutter is arranged at the output end of the driving motor. A dust removal mechanism is arranged on the decoration material cutting machine, and dust generated during working of the cutting machine can be collected by a dust removal box on the dust removal mechanism; and secondly, limiting plates on the two sides of the dust removal box are matched with baffles to be used, so that a closed space is formed in the cutting area, a large amount of dust is preventedfrom flying out of the decoration material cutting machine during working, the dust is prevented from scattering all around, and the influence on the use experience of a user on the decoration material cutting machine is avoided.

The invention relates to a fresh air ventilator, in particular to an airflow direct connection wall hanging type fresh air ventilator, and belongs to the field of indoor ventilation and aeration equipment. The airflow direct connection wall hanging type fresh air ventilator comprises a power-assisted fan component, a main fan assembly and an external filtering layer, and the power-assisted fan component is buried in a wall hole of a room outer wall; the main fan assembly comprises an internal machine shell body installed at the inner side face of the room outer wall, a main fan and a fresh air outlet with an outlet valve, the main fan and the fresh air outlet are arranged in the internal machine shell body in the air supplying direction in sequence, a fresh air inlet connected with the air outlet end of the power-assisted fan component is formed in the back face of the internal machine shell body, and the impeller rotary plane of the main fan is parallel to the room outer wall. Compared with the prior art, the airflow path in front of a main fan inlet is directly connected, the airflow in front of a main fan outlet is directly connected to an indoor room, the airflow path is directly connected and free of a redundancy process, many technological measures for eliminating and reducing noise by arranging two fans, the hollow machine shell, the main fan on at the rear portion of the filtering layer and the like are mainly adopted, and the effects of small noise and a large air volume are achieved.

The invention discloses an oil screen used for a range hood. The oil screen comprises a frame and multiple blades arranged in the frame. Each blade is arranged in the width direction of the frame. All the blades are arranged in parallel in the length direction of the frame to form a grating shape. The oil screen is characterized in that the blades include at least two first blades located in the middle and at least two second blades located on the two sides of the first blades; and the air inlet area, at the positions of the second blades, of the oil screen is larger than the air inlet area, at the positions of the first blades, of the oil screen. The invention further discloses the range hood applying the oil screen. The blades of the type are arranged, the angle of the blades on the two sides is large, the angle of the blades in the middle is small, the interval of the blades on the two sides is large, the interval of the blades in the middle is small, and therefore the negative pressure moves towards the two sides, and the lampblack suction effect is improved.

The invention discloses a bridge construction monitoring system based on the Internet of Things. The system comprises a signal sampling module and a phase-shifting comparison module, the signal sampling module samples node signals in a bridge construction monitoring system by using a signal sampler J1 of which the model is DAM-3056AH; the phase-shifting comparison module receives signals output bythe signal sampling module in two paths; an operational amplifier AR2, a diode D4 and a diode D5 are used for forming a peak detection circuit for screening peak signals in one path of signals; a phase shift circuit composed of an operational amplifier AR4, a resistor R4 and a capacitor C3 is used for carrying out phase shift on the two paths of signals to eliminate signal peaks. An operational amplifier AR3 is used for comparing the two paths of signals; and finally, an operational amplifier AR6, a capacitor C1 and a capacitor C2 are used to form a noise reduction circuit to perform noise reduction adjustment on the signal. The output signal of the operational amplifier AR6 is sent to a bridge construction monitoring system terminal through the signal emitter E1, and a node signal in thebridge construction monitoring system can be sampled and adjusted and converted into a correction trigger signal of the bridge construction monitoring system terminal.

The invention discloses a compressor silencer with cavity, which comprises the following parts: silencer on the compressor top bearing, cavity on each side of silencer center through connecting slot, outlet hole on the cavity with one side near the circumference. The invention adapts Homhouze cavity to absorb special frequency band noise, which reduces noise by two decibel.

The invention provides a noise reduction powdery coating containing glazed hollow beads. The coating is prepared from, by weight, 60-70 parts of epoxy resin, 20-30 parts of polyester resin, 4-6 parts of silicone rubber, 10-15 parts of a curing agent HT835, 1.0-1.3 parts of a polyacrylate leveling agent, 0.5-1.0 part of polypropylene micro-powder wax, 0.2-0.4 parts of benzoin, 10-15 parts of titanium dioxide, 3-4 parts of the glazed hollow beads, 2-4 parts of perlite, 0.3-0.5 parts of linseed oil, 1-2 parts of a silane coupling agent, 0.3-0.6 parts of pure polytetrafluoroethylene micro-powder wax, 8-10 parts of ultrafine calcium carbonate, 5-7 parts of ultrafine blast slag powder, 0.5-0.8 parts of organic bentonite, 0.3-0.5 parts of pentaerythritol tetra[beta-(3,5-tert-butyl-4-hydroxyphenyl) propionate], 0.1-0.3 parts of phosphite ester and 3-5 parts of a modification assistant. The coating has the advantages of low solidification temperature, short solidification time, realization of good levelability, strong adhesion, good appearance and acid and alkali resistance of a film formed by the coating; and the film of the powdery coating has better yellowing resistance than films formed by epoxy powdery coatings in the baking solidification process; and the coating provided by the invention also has the advantages of reduction of spraying energy, production efficiency increase, and noise reduction effect.

The invention discloses a silencer of an automobile air-conditioning system pipeline. The silencer is installed in a refrigerant circulation pipeline, and comprises a shell (3), a gas intake pipe (1) and a gas exhaust pipe (2), wherein the gas intake pipe (1) and the gas exhaust pipe (2) are arranged on the same wall surface of the shell; the shell (3) is internally provided with a reflection plate (4) at the opposite side of the gas intake pipe (1) and the gas exhaust pipe (2). The silencer of the automobile air-conditioning system pipeline is simple in structure, is convenient to connect, and can well reduce noise generated by the flowing of an automobile air-conditioning system refrigerant in a pipeline, so that the influences on noise inside and outside an automobile by gas intake noise can be reduced, and the NVH performances of a finished automobile are improved.

The invention discloses an energy-saving low-noise amorphous alloy transformer. The energy-saving low-noise amorphous alloy transformer includes a housing; two symmetrical installation plates are arranged on a lower surface of the housing; cooling fins are arranged on a front surface and a back surface of the housing; a transformer body is arranged in the housing; a leather cushion is arranged on an internal lower end surface of the housing, and a lower surface of the transformer body contacts an upper surface of the cushion; a high-temperature-resisting coating is arranged on the upper surface of the leather cushion; an energy-saving noise reduction device is arranged on a right side surface of the housing; a shutter is arranged on a left side surface of the housing; an installation frame is arranged on the left side surface corresponding to the shutter, of the housing; and a perforated plate is arranged in an inner side of the installation frame. The energy-saving low-noise amorphous alloy transformer is simple in structure, has the energy-saving noise reduction device capable of performing cooling and noise reduction on the transformer, can improve the noise reduction effect through noise reduction pipes and the perforated plate, can reduce influence of the transformer on a resident living environment, is easy to use, and is high in creativity.

The invention discloses an indoor air cleaning device which comprises a shell and an air outlet cover plate covering an opening in the top part of the shell. An air inlet part, a fan part and an air outlet part are sequentially arranged in the shell in a communicating way from bottom to top; the air inlet part comprises a filter mechanism arranged on the bottom wall of an inner cavity of the shell; and the filter mechanism comprises a filter element with an annular structure, an upper cover plate covering the top part of the filter element, and a lower cover plate covering the bottom part of the filter element. According to the indoor air cleaning device provided by the invention, the utilization ratio of the filter element can be fully improved, the filter element replacement period is prolonged, the filter mechanism can be effectively protected during filter element replacement, and the indoor air cleaning device is convenient to use, energy-saving and environmental-friendly.

The invention discloses a food processor with low noise. The food processor comprises a machine seat provided with a motor, a stirring cup connected with the machine seat and a grinding cutter arranged in the stirring cup; the upper end of the motor shaft of the motor is connected with the grinding cutter, the machine seat is provided with an air inlet and an air outlet, and the air outlet is located on one side of the lower part of the machine seat; and a heat dissipation air flue communicated with the air inlet is defined by the machine seat, a fan is arranged at the lower end of the motor shaft, a volute communicated with the heat dissipation air flue is arranged at the bottom of the machine seat, the volute is arranged at the periphery of the fan, a ventilation curve is arranged between the volute and the air outlet, wherein the arc length of the ventilation curve is L1, the arc length of the volute is L2, and the value of L1/L2 is higher than or equal to 0.5 and lower than or equal to 2. The food processor can effectively lower the noise, and thereby improving the user experience.

The invention provides a variable-volume silencer and a compressor, relates to the technical field of silencers, and solves the technical problem existing in the prior art that gas discharged from a flange can have a certain impact on the top of a silencer, a cavity of the existing silencer is usually changeless, and the buffering effect on the impact airflow is difficult to achieve. The variable-volume silencer comprises a movable silencing part, a silencing fixing part and an elastic structure, wherein the silencing fixing part is fixedly connected with the flange, the silencing fixing partsleeves the movable silencing part, one end of the elastic structure is connected with the movable silencing part, the other end of the elastic structure is fixed, and airflow entering the silencer from a flange air exhaust inlet can impact the movable silencing part to enable the movable silencing part to move to the direction away from the flange so as to increase the volume of the silencer. Thesilencer is used for reducing the noise of the compressor.

The invention discloses a nanofiber composite sound insulation material, comprising a noise elimination layer, a composite sound insulation layer and a sound absorbing layer, which are superposed together, wherein the composite sound insulation layer is located in the middle and is composed of a first single sound insulation layer and a second single sound insulation layer which are superposed together and are of the same structure, and each of the first and second single sound insulation layers comprises a composite fiber layer and a nano fiber layer. The composite sound insulation layer hasan absorption coefficient of more than 0.3 for a 500 Hz sound source, and an absorption coefficient of 0.6 or more for a 1000 Hz sound source, and the sound absorbing performance is good; and the material is provided with the noise elimination layer and the sound absorbing layer, when entering the noise elimination layer, sound waves have friction with the walls of countless holes communicating with each other, and sound energy is converted into heat energy to consume, thereby achieving noise eliminating effect. The structure of the sound absorbing layer allows the contact area between the sound absorbing layer and the sound waves to increase, thereby achieving better sound absorbing effect.

The invention discloses a dust treatment system for a dusting workshop. The dust treatment system for the dusting workshop comprises a dust collecting device, a horizontal filter drum type dust collector and a smoke exhausting device which are sequentially arranged in a dust flow direction, and an induced draft fan is further arranged on a dust flow channel; the dust collecting device communicateswith the horizontal filter drum type dust collector, and the horizontal filter drum type dust collector communicates with the smoke exhausting device; the horizontal filter drum type dust collector is provided with at least one dust treatment bin, each dust treatment bin comprises a first support, a bin body, an exhaust gas inlet, a clean air outlet and a dust collecting hopper. The dust treatment system for the dusting workshop, disclosed by the invention, is adopted to perform centralized treatment on dust in the workshop, so that the dust with large particle size is prevented from enteringa filter cylinder, dust airflow flowing into the equipment can be uniform, the flow velocity of the dust airflow on the outer wall of the filter cylinder is decreased, the filter effect of the filtercylinder is improved, the cleanliness of discharged gas is enhanced, the dust concentration in the gas is less than or equal to 30mg/m3, noise can be reduced to 30 to 40dB, the effects of sound elimination and noise reduction are ideal, national emission standards are met, and the standards of the dust treatment system for the dusting workshop are higher than the national emission standards.

The invention discloses a vibration absorption and de-noising improved structure of a motor rotor. The structure is arranged between two bearings in upper and lower rotor brackets and form a motor together with a stator; the structure comprises a rotor and a rotating shaft; the rotor is sleeved and fixed with the rotating shaft; one end of the rotating shaft passes through the end face of the bearing in the lower rotor bracket and is placed in the lower rotor bracket, and the other end of the rotating shaft passes through the end face of the bearing in the upper rotor bracket to form an output shaft; the vibration absorption and de-noising improved structure of the motor rotor also comprises a vibration absorption device; the vibration absorption device is arranged between the inner surface of a bottom support of the lower rotor bracket and the bearing in the lower rotor bracket, and comprises a retainer ring; and the retainer ring is sleeved on the rotating shaft, one side of the retainer ring is propped against the end face of the bearing, and the other side of the retainer ring is propped against the inner surface of the bottom support of the lower rotor bracket. The vibration absorption and de-noising improved structure of the motor rotor has low material consumption and low cost, is fast to install, can be well positioned and installed in one step, and simplifies the operation process during assembly.