31results about How to "Improve noise pollution" patented technology

The present disclosure provides a system for the synthesis of external sound of a vehicle, the system comprising a hazard analysis unit configured to detect a collision hazard between the vehicle and at least one further road user, in particular an outside traffic participant; at least one electroacoustic transducer; and a sound processing unit configured to generate an audio signal representing an, in particular vehicle dependent, synthetic noise signal and to control the at least one electroacoustic transducer to output a synthetic external sound based on the audio signal, wherein the sound processing unit is configured to modify the audio signal to enhance the perceptibility of the synthetic external sound by the further road user upon detection of the collision hazard.

The invention relates to the technical field of high-purity and high-pressure hydrogen preparation, and discloses a method for providing high-purity and high-pressure hydrogen. The method comprises the steps that (1) an organic liquid hydrogen storage raw material and a dehydrogenation catalyst are in contact to react, and hydrogen containing dehydrogenation reaction products are obtained; (2) thedehydrogenation reaction products are cooled, liquid products and hydrogen-rich gas products are obtained, and the liquid products are collected; (3) hydrogen-rich gas and a hydrogen storage alloy are in contact, a hydrogen containing alloy is obtained, non-adsorbed gas is collected, and then organic matter in a hydrogen containing alloy storage container is removed optionally; and (4) the hydrogen containing alloy is heated, and hydrogen is released. By means of the method, the dehydrogenation conversion rate, the hydrogen purity and pressure and the hydrogen storage quantity of the hydrogenstorage alloy can be effectively improved.

The automatic control method for steel ball coal mill in thermal power plant adopts a double-layer control structure, including an upper layer of self optimizing algorithm and a lower layer of multidimensional fuzzy control algorithm. The self optimizing algorithm finds out the optimal inside coal storage quantity inside the coal mill, the optimal outlet temperature of the coal mill and the optimal inlet negative pressure value of the coal mill as the controlling set values; and the multidimensional fuzzy control algorithm realizes the automatic regulation of the coal feed quantity, the hot air valve opening, and the recirculating air valve opening or the cold air valve opening, so as to ensure the safe and reliable running of the steel ball coal mill system in optimal mode.

The invention provides a sound absorption wall which comprises an outer layer a, a center layer and an outer layer b. The sound absorption wall has a good sound insulation effect and is simple in structure, light in weight, high in construction speed and wide in application range.

The load control method for ball mill in powdering loop cement plant adopts a double-layer control structure, including an upper layer of self optimizing algorithm and a lower layer of multidimensional fuzzy control algorithm. The self optimizing algorithm finds out the optimal inside material storage quantity inside the ball mill as the controlling set value; and the multidimensional fuzzy control algorithm controls the material compounding links to realize the automatic regulation of the material feed quantity, so as to reach the required components in the cement production, lower the raw material amount and the cement screen residue, raise grinding fineness, ensure cement quality, increase output of ball mill and lower production cost.

The invention discloses a centrifuging-free manufacturing method of a prestressed concrete pipe pile. Compared with the currently used centrifugal forming method, the manufacturing method has the advantages that one operation of inflating an air die is added and brings great affect on the manufacturing of the whole prestressed concrete pipe pile, the investment on plant construction is reduced, and the serious noise pollution of a centrifuging machine is also solved. The manufacturing method is free of residual slurry, so that the problem of pollution of slurry can be completely solved; the quality accident caused by insufficient concrete wall thickness can be avoided, thus the yield of the product is increased, and the production cost can be effectively reduced.

A waste heat recovery system for a vacuum moisture conditioner, including a condenser and a circulating water tank, the lower part of the condenser is provided with a steam inlet, a condensed water outlet, a circulating water inlet, and a circulating water outlet, and the condensed water outlet and the circulating water outlet are connected through a pipeline. The circulating water tank is connected, the circulating water inlet is connected with the circulating water tank through a circulating pump, the circulating water tank is provided with a cooling pipe, and the condensed water outlet is connected with the cooling tube through a pipeline. The invention starts from reducing the tube resistance of the heat exchanger and improving the heat exchange efficiency, and conforms to the characteristics of instantaneous, intermittent and large flow of the residual steam discharged by the steam ejection of the jet vacuum humidifier, and uses the radiator as a steam residual steam condenser With structural design, it can be used as a supporting product for this type of vacuum conditioning machine.

The invention proposes a closed cavity type PVDF thin-film loudspeaker. The closed cavity type PVDF thin-film loudspeaker comprises a main structure and an impedance converter; the main structure comprises a PVD thin film, a sound absorbing material layer and a glass fiber reinforced plastics back cavity; the PVDF thin film has double-sided electrodes; the double-sided electrodes respectively leadout external electrodes; the PVDF thin film and the double-sided electrodes are subjected to insulation encapsulation, and parts of the external electrodes are exposed during the insulation encapsulation; an open surface of the glass fiber reinforced plastics back cavity is a cambered surface with a rectangular projection, and the PVDF thin film after being subjected to the insulation encapsulation is sealed and fixedly connected with the edge of the open surface of the glass fiber reinforced plastics back cavity through a sealant; the sound absorbing material layer is fixed inside the glassfiber reinforced plastics back cavity body, and the sound absorbing material layer is not in contact with the PVDF thin film; and the main structure is connected with an external standard power amplifier through the impedance converter. The closed cavity type PVDF thin-film loudspeaker provided by the invention can effectively improve the sound radiation efficiency of the PVDF thin-film loudspeaker and reduce the sound radiation behind the PVDF thin-film loudspeaker, so as to solve the problems of the driving difficulty of the PVDF thin-film loudspeaker, the poor low frequency effect and the noise pollution behind the loudspeaker.

The invention relates to a blast furnace top gas diffusing system. The blast furnace top gas diffusing system comprises a gas ascending pipeline. The gas ascending pipeline is connected with a gas recycling pipeline and at least one furnace gas diffusing pipeline. Furnace gas diffusing valves are arranged at furnace gas diffusing pipeline terminals. The blast furnace top gas diffusing system further comprises a dust removal chamber, the dust removal chamber is provided with an exhaust channel, the dust removal chamber is internally provided with an inner spraying mechanism for spraying water into a cavity of the dust removal chamber, and various furnace gas diffusing valves are all contained in the dust removal chamber. According to the provided blast furnace top gas diffusing system, thedust removal chamber is arranged to surround the various furnace gas diffusing valves, the inner spraying mechanism is arranged in the dust removal chamber, gas exhausted into the dust removal chamberis washed and subjected to dust removal, the cleanliness degree of the diffused gas is improved, and pollution of gas diffusing particles is reduced.