107results about How to "Reduce noise emissions" patented technology

The invention relates to an axial piston machine comprising two cylinder drums which are guided in a housing, can be respectively rotated about a drum axis, and are respectively supported on an inclined surface arranged in the direction of a shaft rotational axis. According to the invention, said inclined surfaces are located in the region between the two cylinder drums and the channels for supplying and releasing pressure end in said two inclined surfaces, i.e. pressure is supplied and released centrally.

The invention discloses a thread turning process parameter optimization method for green manufacturing, which comprises the steps of 1) determining optimization variables such as the cutting speed Vcand the feeding amount f; 2) establishing a multi-objective optimization function; 3) determining constraint conditions; 4) optimizing the objective function to obtain a Pareto optimal solution set thereof; 5) determining the weight of each target attribute according to an AHP (Analytic Hierarchy Process) and RS (Rough Set) based combined weight determination method, and obtaining an optimal solution meeting actual processing requirements from the optimal solution set in the step 4. In the application process of the method disclosed by the invention, parameters in the model can be determined firstly according to the actual condition, then the model is solved by adopting the method so as to obtain the cutting speed Vc and the feeding amount f when the carbon emission, noise emission and dust emission are synthetically optimized, and finally a purpose of reducing the carbon emission, noise remission and dust emission is achieved through controlling mechanical equipment.

The invention discloses a construction method for forming grooves and holes and replacing large-diameter piles with small-diameter piles. The method mainly includes the steps of forming the grooves in an underground continuous wall with the aid of a DTH hammer, forming the holes in the large-diameter piles with the aid of the DTH hammer and replacing the large-diameter piles with the small-diameter piles equivalently through the DTH hammer. Compared with a conventional groove and hole forming method, the construction method has the advantages that the defects that rock entering efficiency is low, holes are deviated, the hammer is stuck and even holes are difficult to form in the construction process under the comprehensive complicated geological conditions such as high-rock surface layers, hard stratums and slope stratums can be effectively overcome, the rock entering construction efficiency during grooving of the underground continuous wall and hole forming of the large-diameter piles can be greatly improved, the technical problems of the rock entering groove and hole forming construction under the complicated geological conditions such as high rock surface layers and hard stratums are solved, the construction quality is stable and reliable, the requirements for safety civilization and environmental construction are met, and economic loss and construction time loss of a project can be effectively avoided.

A device having a hydraulic drive for civil engineering work has least one shaft that can be rotated by a hydraulic motor. The hydraulic motor is operated by fluid of a hydraulic circuit that is supplied by a hydraulic pump. The hydraulic motor has a changeable displacement, and means for changing the volume stream are provided. A sensor for measuring the fluid pressure is disposed in the hydraulic circuit, and is connected with a control and regulation unit, by way of which the displacement of the hydraulic motor is adjustable, and by way of which the means for a change in the volume stream can be turned on. The control and regulation unit is set up so that in the event of a pressure drop in the hydraulic circuit, a reduction in the displacement of the hydraulic motor as well as a reduction in the volume stream is brought about.

The invention relates to a wind turbine blade brush and provides a rotor blade for a wind energy system. The rotor blade comprises a blade body with a rear edge and a front edge, and a plurality of bristles on the external surface of the blade body. The bristles are adhered in the vicinity of the rear edge of the blade body under typical circumstances and are used for reducing the noise caused by the air current near the blade during work.

The invention is related to a helicopter with a longitudinal axis and with a tail portion (1) with a transverse duct (6) and a drive shaft (23) inside a drive shaft fairing (14) for an aerodynamic and acoustic optimized counter-torque device (2) supported within said transverse duct (6).

An air filter for a combustion machine including a housing with a flow passage and a filter insert, wherein said filter insert subdivides the flow passage into an intake flow passage with an air inlet opening and into a discharge flow passage with an air outlet opening, wherein the filter insert has an air inlet surface which extends at least region-wise over the length of the filter insert along the air flow direction, wherein said filter insert has at least two successive filter elements, wherein the outside diameter or diameters of said filter elements, is or are different.

Previously known side-channel blowers for an internal combustion engine comprise a fluid-penetrated housing, an impeller (16) that is rotatably arranged in said housing, impeller blades (32) that are formed in the radially outer region of the impeller (16) and are open in the radially outward direction, a radial gap (52) between the impeller (16) and a housing wall (54) that radially surrounds the impeller (16), an inlet (18), an outlet (30), two gas ducts (20, 22) which connect the inlet (18) to the outlet (30), are formed axially opposite the impeller blades (32) in the housing, and are fluidically connected to one another via intermediate spaces between the impeller blades (32), a drive unit (14) for driving the impeller (16), and an interruption zone (58) which is located between the outlet (30) and the inlet (18) and in which the ducts (20, 22) are interrupted in the peripheral direction. In order to be able to manufacture the blower at a lower cost by increasing tolerances and render the blower less prone to the formation of ice and accumulation of dirt without reducing the delivery rate, according to the invention, a radial interrupting gap (64) between the impeller (16) and the radially delimiting housing wall (54) in the entire interruption zone (58) is 0.005 to 0.03 times the diameter of the impeller.

Tank for a liquid-filled transformer or inductor, comprising: a) an outer tank casing (2) comprising a bottom part (3); b) an inner tank casing (5), enclosed by the outer tank casing (2) at a distance (4), wherein the outer tank casing (2) and the inner tank casing (5) are formed from metal; c) a plastic or polymer material (7), which is incorporated in an intermediate space (6), bounded by the inner surface (14) of the outer tank casing (2) and the inner surface (13) of the inner tank casing (5), and at least partially fills this intermediate space (6), wherein the plastic or polymer material and the adhesion thereof to the inner surfaces (13, 14) is designed such that d) shearing forces are transmitted between the inner and outer tank casings (2, 5) and that e) the transmission of structure-borne sound that is generated in the case of operation of an active part (10) arranged in the interior space (9) of the tank between the inner tank casing (5) and the outer tank casing (2) is inhibited.

The invention provides a warp knitting machine (1) and its operation method. The warp knitting machine comprises a main axle (2) driven by main axle driving device (3), at least a following drive device (19-21) and a controller for controlling following drive device according to capstan. In addition controller (22) comprises a capstan generator (23) for forming virtual capstan. The invention is to provide a high yield warp knitting machine.

The invention discloses a Roots blower pipeline noise reduction device which comprises silencing box and an internal sound absorbing layer wrapped outside a pipeline. The internal sound absorbing layer is disposed in the silencing box. A cavity is formed between the inner wall of the silencing box and the sound absorbing layer. The silencing box, the cavity and the internal sound absorbing layer form a secondary silencing composite structure. The internal sound absorbing layer is three-layered and comprises a galvanized plate, high-density centrifugal glass cotton and low-density centrifugal glass cotton from outside to inside. The silencing box is four-layered and comprises a face protecting layer, a sound insulation layer, a sound absorbing layer and a inner plate form outside to inside. By the secondary silencing composite structure, the problem that inlet-outlet pipeline noise is high and radiation range is wide during operation of a Roots blower is solved, and noise pollution to environments is reduced effectively. The device is suitable for wide popularization in places with severe noise pollution.

Transmission, in particular multi-step transmission, for a motor vehicle, comprising a housing, a drive shaft, an output shaft, at least four planetary gear sets, wherein the planetary gear sets in each case comprise a sun gear, a planet, a planetary carrier and an internal gear, and a plurality of shifting elements in the form of at least four clutches and at least two brakes, wherein the drive shaft can be connected via the second clutch to the planetary carrier of the third planetary gear set and the planetary carrier of the fourth planetary gear set, wherein the first brake is connected to the internal gear of the first planetary gear set and to the planetary carrier of the second planetary gear set, wherein the second brake is connected to the sun gear of the first planetary gear set, and wherein the planetary carrier of the first planetary gear set is connected to the sun gear of the fourth planetary gear set.

The invention relates to a transmission punching mechanism of a vehicle interior and exterior trimming product die. The upper end of a trolley is provided with a lower fixing table-board. The lower fixing table-board is fixedly provided with guideposts and interior trim part supporting plate. The upper ends of the guideposts are provided with an upper fixing table-board. The upper fixing table-board is fixedly provided with a motor through a motor fixed base. The output shaft of the motor is fixedly provided with a transmission lead screw. A puncher pin fixing plate is arranged between the upper fixing table-board and the lower fixing table-board. The puncher pin fixing plate is provided with a guide sleeve. The puncher pin fixing plate is provided with an inner threaded hole. The guide sleeve is cooperated with the guidepost. The inner threaded hole and the transmission lead screw are cooperated. The lower surface of the puncher pin fixing plate is fixedly provided with a holddown spring and a puncher pin. The puncher pin is in the holddown spring. The transmission punching mechanism is simple, compact, and reasonable in structure. The transmission punching mechanism can ensure to complete hole site punching, reduce noise emission, reduce equipment investment, reduce maintenance and component changing cost.

Pneumatic vehicle tyre with a tread which are divided by circumferential grooves (2) and by tread lugs extending in the circumferential direction, at least one profile strip (1, 1', 1 ") being part of said profiles. In the profile strip (1, 1', 1 "), respectively three grooves (4, 5, 6, 4', 4 ", 5 ", 6 ") having a width of 0.8 mm to 1.5 mm form a groove group (3, 3', 3 "). Said grooves (4, 5, 6, 4', 4 ", 5 ", 6 ") form stars, starting from a recessed central region (7), and at least two grooves (5, 6, 5 ", 6 ") of the groove group (3, 3', 3 ") end within the profile strip (1, 1', 1") and a groove (4, 4', 4 ") extends axially or essentially in the axial direction of the running strip.