141 results about "Noise, vibration, and harshness" patented technology

The invention is a sprayable coating having noise vibration and harshness reduction or absorption properties. Such composition comprises from about 10 to about 60 percent of the flexible epoxy resin, from about 5 to about 40 percent by weight of a rigid epoxy resin formulation, and a curing agent for the epoxy moieties of the two resins. In another embodiment, the invention is a method of coating a substrate to reduce the impact of noise vibration and harshness on the substrate or users of the substrate, which process comprises spraying the above defined composition on to a substrate and curing the resin on such substrate. In yet another embodiment the invention is a coated substrate described herein before having enhanced noise vibration and harshness properties.

The invention aims at providing a method for controlling engine revolution speed during starting of a hybrid power vehicle, in order to improve the fuel economy of the entire vehicle, reduce emission, lighten environmental pollution and improve the NVH (Noise Vibration and Harshness) performances of the entire vehicle. In the method, an ISG (Integrated Starter Generator) motor is used for driving an engine to rotate, the key point is that the engine is controlled to perform oil injection and ignition when the revolution speed of the engine is increased to exceed a first preset revolution speed by the ISG motor, and the ISG motor retreats a speed mode at the same time. In the method for controlling the engine revolution speed during starting of the hybrid power vehicle, by controlling the ignition time of the engine and the working mode variation of the ISG motor in a starting stage, the starting peak revolution speed of the engine is decreased, the fuel economy of the entire vehicle is further improved, and pollutant emission and environment pollution caused by the same are reduced, meanwhile, the NVH performances of the entire vehicle are improved.

The invention aims to provide a computer simulation prediction method of the in-car vibration and noise of a car. The computer simulation prediction method comprises the following steps: A: calculating the reciprocating inertial force and the reciprocating inertial moment of a crank mechanism of an engine; B: according to the combustion pressure of the engine, calculating a moment generated by air pressure; C: processing engine load into frequency domain load according to orders; D: establishing an NVH (Noise Vibration and Harshness) finite element simulation model of a complete car, preliminarily judging the correctness of a model according to a modality, and loading the load onto an engine centroid in the model; E: calculating a response curve of the in-car vibration and noise, and comparing the response curve with a target value; F: according to the response curve of the in-car vibration and noise and the target value, finding a peak point which affects NVH performance to carry out contribution analysis; and G: according to a contribution analysis result, carrying out structure improvement to lower a noise or vibration peak. The computer simulation prediction method can predict and solve problems before manufacture cost is generated, a great quantity of cost is saved, and a development period is shortened.

The invention relates to the field of automobile designs and in particular relates to a structural NVH (Noise Vibration and Harshness) analysis method for vibration interference abnormal noise based on modal frequency response. The method comprises the following steps: establishing a finite element model of a turning mechanism by virtue of a three-dimensional model, analyzing by adopting CAE software, combining the dynamic clearance deformation condition when two structural members are connected by virtue of a rubber bushing, thereby obtaining dynamic displacement values in three directions (X, Y, Z) of reference points of an axle tube and an axle lever; comparing the displacement values and the corresponding frequencies of the two reference points, calculating the clearance between the axle tube and the axle lever during movement, comparing the geometric layout size calculated clearance and the analyzed clearance, and further performing structural modification. According to the method disclosed by the invention, the development cycle of the product is shortened, the research and development cost is reduced, the response time is short and accurate, and motion interference abnormal noise and other engineering problems in the structural vibration are solved, so that the NVH performance of the complete vehicle is improved, and the method has important guiding significances for performing dynamic verification design on the complete vehicle and other system assemblies and on research and development of the complete vehicle.

The invention discloses an air filter of an automobile engine, which is used for solving the problems that the volume of the air filter is large and the effective filtering area of a filtering core is small in the prior art. The air filter comprises an upper shell, a lower shell and the filtering core, wherein the outer side wall of the upper shell is provided with an air outlet of the air filter; the outer side wall of the lower shell is provided with an air inlet of the air filter. The air filter is characterized in that an airflow buffering belt is arranged between the upper shell and the lower shell; the filtering core is arranged in a cavity of the lower shell; the lower shell and the filtering core are respectively in a conical structure. The air filter disclosed by the invention has the advantages that not only can the filtering efficiency of the air filter be improved and can the NVH (Noise Vibration and Harshness) performances of a vehicle are improved, but also the distribution of an engine cabin of the vehicle is easy.

The invention discloses a natural twist microscopic profile correction optimization method of a worm grinding wheel grinding helical gear. A meshing model of the worm grinding wheel grinding helical gear is constructed to deduce a contact trace equation, a gear form and lead evaluation range is selected, a gear surface twisting model is established, and a gear form and lead angle deviation value is obtained under the natural twist of the worm grinding wheel grinding helical gear; the correlation detection data of an existing project is collected, a twist quantity under natural twist is calculated, whether calculation data and detection data are matched or not is verified, and a transferring error under existing natural twist is calculated; and therefore, gear microscopic profile correction parameters related to the natural twist are optimized, wherein optimization comprises the following steps of: reducing a lead drum-shaped size, regulating a mating gear drum-shaped size, regulating a mating gear twist quantity, and lowering and compensating influence brought by the natural twist of the worm grinding wheel grinding helical gear. By use of the method, gear bearing performance can be effectively improved, gear meshing impact is reduced, and transmission accuracy and a NVH (Noise Vibration and Harshness) level are improved.

The invention provides an automobile interior trim part and a forming process for the same. The automobile interior trim part sequentially consists of a composite knitted fabric layer, a fiberglass mat, a PU (polyurethane) foam sheet, the fiberglass mat and a PET (polyethylene terephthalate) material layer from top to bottom. The automobile interior trim part and the forming process for the same have the advantages and positive effects that the cost is lowered, the production efficiency is improved, and the occurrence rate of quality problems is lowered; sound insulation and noise reduction effects can be achieved, and the NVH (noise vibration and harshness) performance of a product assembly can be improved; energy is saved, and the consumption is reduced.

The invention relates to a top-cover outer plate and skylight reinforcing frame structure comprising a front reinforcing frame, a rear reinforcing frame, a left reinforcing frame and a right reinforcing frame. In the front reinforcing frame, the rear reinforcing frame, the left reinforcing frame and the right reinforcing frame, gaps are designed above a top-cover outer plate and a skylight reinforcing frame. By the top-cover outer plate and skylight reinforcing frame structure, abnormal sounds at the matching position of the front reinforcing frame due to metal-plate adhesion instead of connection are avoided; through the design of shock-insulating rubber, connection strength of two plates is improved; vehicle NVH (noise vibration and harshness) performance and vehicle quality are improved; through the design of two surfaces, width of the matching surface of a vertical turnup of the front reinforcing frame and a seal rubber strip is shortened, a welding matching surface and a seal rubber strip surface are separated, abrasion of the seal rubber strip surface is reduced, and accordingly, abrasion probability of the rubber strip is greatly reduced.

The invention discloses a vibration exciter for NVH (Noise Vibration and Harshness) test and an application method thereof. In the vibration exciter, a vibration exciter body is connected with a vibration exciting head through a force transducer. Due to the adoption of the method and a structure, the vibration exciter and the application method have the advantages that: 1, the vibration exciter does not have any strict distance requirement on an excited part, can be applied to a non-horizontal plane, and is flexible and convenient for operating; 2, the force transducer is not required to be stuck to the excited part, the vibration exciter can be positioned without a worktable, and high working efficiency is realized; and 3, the structure is simple, and production cost is low.

A fuel delivery system is provided to reduce the pressure pulsations and noise vibration and harshness of direct injection systems. The fuel delivery system includes an elastic fuel line positioned between a first fuel pump and a second fuel pump and a check valve positioned in the elastic fuel line near the inlet of the high pressure pump, the check valve including an external housing having a peripheral surface with a greater diameter than an unstretched inner diameter of the elastic fuel line.

The invention provides a novel vehicle roof, which is formed by sequentially combining a composite knitted fabric, a fiberglass mat, a foam plate, another fiberglass mat and a bottom-layer non-woven fabric from top to bottom by adhesive films. The invention also provides a process for producing the novel vehicle roof. According to the production process, the advantages of simple procedure, high production rate and the like of a dry forming process and the advantages of roof forming performance higher than that of the dry forming process, lightweight roof and the like of a wet forming process are combined, namely the production process is used for forming the novel vehicle roof under a dry condition in a wet forming way (namely a cold material and a hot die). The VOC (volatile organic compound) performance of the roof is weakened, and the NVH (noise vibration and harshness) performance of the roof is improved; the novel vehicle roof and the production process have the advantages of high product forming performance, lightweight product, capability of improving the production rate of the product, less environmental pollution and the like.

The invention discloses a longitudinally arranged power assembling suspension system matching method and system. The longitudinally arranged power assembling suspension system matching method comprises steps of arranging suspension points according to a four-pint suspension system; increasing two auxiliary suspension points with a target of enabling the static bending moment of the rear end surface of a flywheel casing to be equal to zero when the static bending moment of the four points is larger than the maximum bending moment; matching to obtain a rigid body model of a six-point suspension system, if the rigid body model does not satisfy an NVH (Noise Vibration and Harshness) design requirement and matching and acquiring the six-point suspension system within a setting range of a static compression amount under constraint conditions of enabling the static bending moment to be smaller than the maximum static bending moment, the vertical static rigidity of the middle suspension of the six-point suspension to be smaller than that of the rear suspension of the four-point suspension and the rigid body model to satisfy a requirement for the frequency difference in the NVH and with the decoupling rate of Z2 and RX direction being served as a maximum optimization target. The longitudinally arranged power assembling suspension system matching method can guide a designer to achieve matching of the six-point suspension system, reduces requirements for the designer, shortens the development period of the suspension system and saves the testing costs.

The invention provides a vehicle front body structure which has the advantages of good process feasibility and easy manufacture. The vehicle front body structure is characterized by comprising a front baffle plate and a front windshield lower bean assembly, wherein the front windshield lower beam assembly comprises a front windshield lower beam, a lower supporting plate of the front windshield lower beam and a running water tank body; the upper end of the front baffle plate is fixedly connected with the front windshield lower beam and the lower supporting plate of the front windshield lower beam through the running water tank body; and sealing cavity structures extending along the width direction of the vehicle body are formed among the running water tank, the front windshield lower beam and the lower supporting plate of the front windshield lower beam. In the invention, the front torsional rigidity of the vehicle body can be effectively improved through a plurality of sealing cavity body structures, and through the connection of a left damper seat and a right damper seat, the local rigidity of the damper seats is also obviously improved; and in addition, the front baffle plate with a novel structure is adopted to effectively separate noise transmitted from a front cabin, thereby the NVH (Noise Vibration and Harshness) performance of a passenger compartment is improved.

The invention discloses an automobile exhaust suspended structure which comprises two lifting lugs (1) and a lifting hook (2), and also comprises an installing bracket (3) used for connecting the lifting lugs (1) with the lifting hook (2), wherein the lifting lugs (1) are arranged on the installing bracket (3) which is connected with the lifting hook (2), a slot (10) used for installing the lifting lugs (1) is arranged on the installing bracket (3), the lifting lugs (1) are clamped in the slot (10), the center of each lifting lug is provided with a center hole, the lifting lugs are connected through a U-shaped pipefitting (4), two ends of the U-shaped pipefitting (4) are respectively inserted into the center holes of the lifting lugs (1), the lifting lugs (1), the installing bracket (3) and the lifting hook (2) are arranged in a V shape, and the lifting lugs (1) and the installing bracket (3) are arranged at the vertex angle of the V-shaped structure. The invention improves the mode frequency of the exhaust suspended structure and meets the requirement on automobile NVH (Noise Vibration and Harshness) performance through structure improvement.

The invention provides a multicavity resonance muffler which solves the technical problem that a superchargerof the conventional supercharged engine produces high-frequency noise during low-speed instant acceleration. The multicavity resonance muffler is characterized in that a barrel is a conical barrel of which the diameter of an air flow outlet is less than that of an air flow inlet; a circular table-shaped inner cavity is formed in the barrel; a barrel wall is ofa two-layer structure with a cavity interlayer spaced; a plurality of annular radial partition plates are arranged in the interlayer; the cavity interlayer is divided into a plurality of annular cavities distributed along the axial direction by the radial partition plates; and strip-type muffle holes of different widths are formed in an inner layer barrel wall, and are formed in a staggered manner along the circumferential direction of the inner layer barrel wall. Mutual interferencecaused by the resonance of the strip-type muffle holes of the various resonant cavities are avoided; in addition, the resonant cavity volumes of various sections ofresonant and mufflingcavitiesare changed with the design of the outer wall of the conical barrel; the specific noise elimination bandwidth of each resonant cavity is regulated effectively; the noise reduction effect of the overall structure is improved; and the NVH (Noise Vibration and Harshness) of a finished automobile is improved effectively.

The invention relates to an engine suspension cushion which comprises an upper framework, a lower framework, a damping component connected between the upper framework and the lower framework, a small bracket connected with the upper surface of the top part of the lower framework and a big bracket connected with the two sides of the lower part of the lower framework, wherein the upper framework is groove-shaped; the two sides of the opening part of the groove are respectively first turn-up sides; the two first turn-up sides are respectively provided with a first stud which is vertically connected to each first turn-up side; a forward stretching section is arranged at the bottom of the groove; a stud hole and a positioning pin hole are formed in the stretching section; the lower framework is inversely U-shaped, the left side surface is a left faying surface while the right side surface is a right faying surface; the lower framework corresponds to the stretching section at the bottom of the groove of the upper framework; a stud hole and a positioning pin hole are formed in the top part of the lower framework; the damping component comprises an upper mounting plate, a lower mounting plate and a rubber cushion block arranged between the upper mounting plate and the lower mounting plate for connection. The engine suspension cushion disclosed by the invention is light in weight, high in rigidity and good in vibration isolation effect, and can meet the requirements on NVH (Noise Vibration and Harshness) and reliability.

The invention provides an air compressor for a fuel cell, which is applied to the technical field of the fuel cells. A driving gear (2) in a rotor casing (1) of the air compressor for the fuel cell is connected with a driving shaft (4); a driven gear (3) is connected with a driven shaft (5); the driving shaft (4) is connected with an input shaft (6); a driving rotor (7) is arranged on the driving shaft (4); a driven rotor (8) is arranged on the driven shaft (5); an air inlet (9) in the rotor casing (1) is close to the driving rotor (7) and the driven rotor (8) in position; the input shaft (6) is connected with a motor (10). According to the air compressor for the fuel cell, provided by the invention, the durability and the reliability of the air compressor for the fuel cell are effectively improved, further the overall performance of an air supply system is improved, the volumetric efficiency and the insulating efficiency of the air compressor are improved, and NVH (Noise Vibration and Harshness) performance of the air compressor is improved.

The invention discloses a machining technology for an automotive transmission gear. In a technological flow, the sequence of gear grinding of the gear and press fitting of the gear and a shaft is adjusted; the specific flow comprises the following steps: firstly, carrying out rough machining, hobbing, heat treatment and fine machining on a gear blank; then pre-heating an inner spline of the gear;selecting the shaft which is in press fitting with the gear; carrying out press fitting on the machined gear and the shaft; and after the press fitting is finished, carrying out gear grinding machining on the gear. By adopting the technology, iron chips between the gear and the shaft are reduced and the precision of the gear is improved; a process and working procedure technology is optimized andNVH (Noise Vibration and Harshness) of a transmission assembly is improved; a transmission gear machining working procedure is optimized so that the eccentricity caused by the fact that the press fitting is carried out after the gear grinding is carried out is made up and transmission errors are reduced; the gear engagement accuracy can be greatly improved and a transmission error value of the transmission assembly is reduced very well; a noise value of a transmission can be reduced very well and customer complaints of aftersales markets are reduced; and the machining technology can be appliedand implemented in a large scale and the competitiveness of enterprises is improved.

The invention provides a horizontally opposed range extender, which belongs to the fields of power generating equipment and new energy automobiles. The horizontally opposed range extender comprises an internal combustion engine and a generator, wherein the internal combustion engine comprises a left cylinder body and a right cylinder body, the left cylinder body and the right cylinder body are interconnected to form a crankcase, a rotatable crankshaft is arranged in the crankcase, two crank throws are arranged on the crankshaft, connecting rods are respectively connected to the two crank throws, pistons are respectively connected to the two connecting rods, the two pistons are respectively in sliding connection to the insides of a left piston cylinder and a right piston cylinder, the left piston cylinder and the right piston cylinder are oppositely arranged on both sides of the crankshaft, the axial leads of the left piston cylinder and the right piston cylinder are mutually parallel, and a rotor of the generator is fixedly connected to the output end of the crankshaft. According to the horizontally opposed range extender, the size of the cylinder bodies can be effectively reduced, the length of the crankshaft can be shortened, so that the processing difficulty and intensity are reduced, and additionally, the running balance of the crankshaft can be increased, so that the noise and vibration of the internal combustion engine can be effectively reduced during running, and the NVH (Noise Vibration and Harshness) problem of the range extender is effectively solved.

The invention discloses a hydraulic power train mount with a throttle disc. The hydraulic power train mount comprises a connecting support, an elastic mainspring, an upper liquid chamber and a lower liquid chamber, wherein the elastic mainspring, the upper liquid chamber and the lower liquid chamber are mounted on the connecting support. An inner core is arranged on the elastic mainspring, and the upper liquid chamber and the lower liquid chamber are partitioned via a passageway assembly. The hydraulic power train mount is characterized in that the throttle disc is arranged in the upper liquid chamber and connected with the inner core via bolt, and a spring is arranged between the throttle disc and the inner core. The hydraulic power train mount with the throttle disc has the advantage that liquid column resonance phenomenon therein can be postponed, and high dynamically hardening frequency can be effectively prolonged, so that vibration isolation performance of the hydraulic power train mount can be improved, and NVH (noise vibration and harshness) and comfort of a whole car are facilitated.

The invention provides a vehicle interior noise testing road surface, a laying method of the vehicle interior noise testing road surface and a vehicle interior noise testing method. The vehicle interior noise testing road surface comprises a surface layer of which the thickness is 120mm, wherein the surface layer comprises stone materials mixed at a weight ratio of 1:1; the particle sizes of the stone materials are 10mm and 15mm respectively; and gaps between the stone materials are filled with modified asphalt. According to the invention, road surface parameters of a rough road surface are designed and determined; the testing road surface is added and perfected; through a test of vehicle interior noise on the rough road surface, a testing and evaluation scheme is provided for vehicle interior noise reduction; the NVH (Noise Vibration and Harshness) level of a finished automobile is raised; and the product performance is more competitive.