42 results about "Car noise" patented technology

The invention discloses a method for separating a speed changer knocking structure noise and an air noise based on a transmission path. The method comprises the following steps: knocking noise acquisition under an acceleration condition, a finished automobile sound transmission function test and knocking air radiation sound and structure transmission sound separation. By using the method, sizes of the structure noise and the air noise in the speed changer knocking noise transmitted to the automobile can be objectively and accurately separated.

The invention discloses an active elevator car noise control method and device. The method comprises steps that at least one noise source is acquired; according to noise signals of the noise source with different frequency bands, offset sound sources which have opposite phases and identical amplitude relative to the noise signals are respectively acquired through calculation; the offset sound sources are played to offset the noise source. According to the method, the active noise reduction technology is employed for the noise source in an elevator car to realize frequency band division of the noise signals, the offset sound sources which have opposite phases and identical amplitude relative to the noise signals are respectively acquired through calculation, and the offset sound sources are played to offset the noise source. The method is advantaged in that the complex elevator environment is fully considered, the method is applicable to occasions with relatively large noise frequency change, change for the elevator car is relatively small, the method is applicable to reconstruction of old elevators, the construction process is simple, for newly-designed elevators, design difficulty of the elevators does not increase.

The invention provides a vertex analysis method for in-car vibration noise prediction based on an agent model. The method comprises the steps that at first, a finite element model of the in-car vibration noise prediction is established according to actual demands of an engineering field, and a target response is determined according to a given target space position and a target frequency scope; secondly, an interval model is used to quantify uncertain parameters, a Gaussian integration point is used to sample interval parameters, and the finite element model of the in-car vibration noise prediction is used to compute real responses at interval parameter sample points; and finally, the agent model of the target response is established by the real response values of a discretization scheme based on high-dimensional model representation theories, values of the agent model at all the vertexes of a hypercube are computed based on a vertex analysis theory, and finally a frequency response distribution of in-car vibration noise interval boundaries can be obtained. The method provided by the invention overcomes dependence of the in-car vibration noise prediction on large sample size experiment data of parameters and applicability limiting of small-interval parameters; and the method provides a basis for formulation of noise reduction measures such as in-car noise optimization and control.

The invention relates to a method for acquiring a noise excitation load in a railroad passenger car and a device thereof; the method of the invention is to collect transverse, vertical and longitudinal vibration signals at a contact point of a steering frame of the railroad passenger car and a secondary suspension by utilizing a characteristic that the vibration at the contact point of the steering frame of the railroad passenger car and the secondary suspension is basically consistent with the vibration near a contact point on the side beam, and to calculate the vibration at the a contact point of the secondary suspension and a carriage by the frequency response function of the secondary suspension. The method and the device are simple and precise, have easy operation, reduce the design cost, are capable of carrying out a harmonic vibration analysis on the carriage and obtain the vibrating situation of wall panels of the carriage, thereby providing source data for the precise calculation of the in-car noise and evidence for the effective measures taken to reduce noise. In order to ensure that the passenger car can stall measure the vibration signal when moving at a high speed, a magnetic base structure is adopted, and the collection of the vibration signal can be finished by simply adsorbing a magnetic base on the side beam of the steering frame, thus having simple structure, convenient installation and easy adjustment.

The invention discloses an active noise reduction module eliminating automobile noise. The active noise reduction module includes a microphone pickup monitoring unit, an analysis noise reduction output chip, a loudspeaker, a wire interface, a Bluetooth module, a power supply and a control module. According to the active noise reduction with a wire capable of being inserted and pulled out, noise in an environment is monitored through the microphone pickup monitoring unit, a noise signal is transmitted to the analysis noise reduction output chip, after operation analysis of the analysis noise reduction output chip, a noise reduction signal instruction is sent out, and the loudspeaker sends out sound waves which are opposite to noise in phase and are the same as noise in amplitude to counteract noise. The problem of low frequency noise is effectively solved, the tone quality can be improved, the characteristics of being small and exquisite and flexible, and being started for use at any time are achieved, and through adoption of a low power consumption technical scheme, very long standby time can be realized.

This invention relates to modified lubricating oil, especially antifriction green lubricating oil, it includes following weight percentage constituents, base oil 86-96%, engine oil complexing agent 3-13.8%, dialkyl phosphorodithioic acid oxygen molybdenum0.2-3%. When the lubricating oil made by production process request used on vehicle engine, it can greatly improve lubricating and fuel oil economical efficiency. The fuel oil is economized, car oil consumption is reduced 12.4%, out car noise reduces 2.4%, and inner car noise reduces 3.4%. The additive is easy to make, cost is low and is easy to extend.

The on-line detection system for rear axle noise quality comprises: a T-shaped test platform with a rigid front plane to prevent leakage and absorption of car noise, a data acquirement and process system, and a control system, wherein there are two elevating platforms on the rigid plane to adjust car attitude for detection on different vehicles; a back drive slide platform can connect with vehicle easily to provide power. As master-slave structure, this invention runs stably, has strong resistance to noise, and can save cost through drive four motors by one frequency converter.

The invention discloses a skylight noise reducing control method and device, and a skylight controller. The method and device are applied to the skylight controller of a car, and the noise reducing control method comprises the steps that when a skylight of the car is in an opening sate, whether noise reduction treatment is needed or not is judged according to current in-car noise of the car or a set state of a user; when the noise reduction treatment is needed, read operation is conducted from a preset dynamic noise reduction meter according to the current in-car noise or the current car speedof the car, and the target control opening degree of a skylight is obtained; and skylight glass of the skylight is controlled to act so as to make the current opening degree of the skylight glass reach the target control opening degree. Through control over the current opening degree of the skylight by the scheme, the current in-car noise can be effectively reduced, namely, the in-car noise caused by wind noise of the skylight during running of the car is effectively reduced, and thus the ride comfort of the car is improved effectively.

The invention discloses a test method for noise outside an automobile. The method comprises free rolling tire test steps that A, air intake and exhaust ports of the automobile are silenced by mufflers, a casing of an exhaust system is sealed, original automobile tires are utilized by the automobile, the automobile is turned off, neutral taxiing operation is performed, through testing, the noise outside the automobile is Sa, the road surface temperature is Ta, free rolling tire noise S tire rolling=Sa+K(T0-Ta), wherein T0 is the reference temperature, and K is a tire noise temperature conversion coefficient. The method is advantaged in that influence of the road surface temperature on the calculation result can be eliminated, free rolling tire noise can be distinguished from traction torquetire noise, each main sound source of the noise outside the automobile can be identified to the greatest extent, and accuracy of the experimental result is improved.

The invention discloses a city space without traffic jams, automobile noise or automobile exhaust air pollution, and a manufacturing method thereof, and aims to provide a city space without ground traffic jams, automobile noise pollution and automobile exhaust air pollution, and a method for making a city space product capable of being copied generally. The technical scheme is that: a city underground space is made to have the same layout as a ground space for streets, lanes, buildings and public activities, is matched with the ground space vertically, and is special for running and parking motor vehicles, the ground non-motorized traffic is conveniently connected with the underground motor traffic through elevators, treads and electric protective escalators, and ground and underground city functions are divided all time. Meanwhile, the ground and underground layered spatial structure is also a spatial structure for collecting and treating automobile exhaust and automobile noise in a centralized way, so that the city ground space becomes a green city space which does not have automobile noise and exhaust air pollution and is compatible with various city functions.

The invention discloses an in-car random vibration noise prediction method based on a sparse grid point collocation theory. The method comprises the following steps: firstly, according to the practical requirements of an engineering field, establishing a finite element model for in-car random vibration noise prediction, and determining a target spatial position and a target frequency range; secondly, after a random model realizes the quantification of relevant uncertainty, sampling random parameters on the basis of the sparse grid point collocation theory, and utilizing the finite element model for the in-car random vibration noise prediction to calculate a response value on each random parameter sample point; and finally, according to a discrete scheme response value, calculating to obtain the coefficient matrix of a polynomial chaos expansion agent model responded by the in-car random vibration noise, and furthermore, calculating to obtain the mean value frequency response distribution and the variance frequency response distribution of the in-car random vibration noise on the basis of the coefficient matrix. The method simultaneously considers the random effect on the in-car random vibration noise by external load and structure material parameters and air dielectric characteristic parameters, and provides a basis for formulating noise reduction measures including in-car noise optimization and control and the like.

The invention provides a hand-held navigation device and a method for determining the location of an automobile by the automobile noise. The hand-held navigation device comprises a memory, a display for displaying map information and navigational instructions, a microphone for inputting a sound signal to the hand-held navigation device, and a processor for controlling the operation of the hand-held navigation device and determining the speed of the automobile. The processer receives and analyzing the sound signal from the microphone for determining the speed. When the hand-held navigation device does not receive the Global Positioning System (GPS) satellite signal, the processor determines the speed of the moving automobile according to the received and analyzed sound signal, and estimates the present location of the automobile based on the speed of the automobile.

The invention provides an elevator and a car noise reduction method; the method can simply limit sound standing waves in the car with low cost so as to effectively and stably reduce car noises; the invention also provides a structure realizing the method; an car (20) inner look up ceiling, formed by a ground panel, a ceiling panel, a front panel, a back panel and left and right panels, is viewed to be an approximately rectangular shape; four peaks of the rectangular are provided with openings (32a); the inner side, viewed from the inner side of the car, of the opening is provided with a cavity (32); the inner side of the cavity outputs control purpose second stage sound waves, so the radiation in the car can be controlled by the second state sound wave from opening (32a) on the four peaks of the ceiling.

The invention relates to a glass fiber impregnating agent, a sound-absorbing glass fiber and a filling process thereof, and belongs to the field of development of glass fiber impregnating agents. Theimpregnating agent is prepared from solid components formed by a coupling agent, a lubricant, a film-forming agent, an antistatic agent and a pH regulator and water, and a functional coating is formedon the surface of the glass fiber by the impregnating agent, so that the production manufacturability of the glass fiber for sound absorption and noise reduction can be remarkably improved. Parameters in the filling process are changed, and the sound-absorbing glass fiber is filled into a device cylinder of an automobile, so that the aim of reducing the noise of the automobile can be fulfilled, and meanwhile, particle emissions in automobile exhaust can be reduced.

The invention particularly relates to an electric instructional car system for simulating a fuel car. The electric instructional car system comprises a whole car sensor for monitoring the running state of the whole car in real time, a whole car controller, namely a VCU (Vehicle Control Unit), in signal connection with the whole car sensor, a motor controller and a noise controller, wherein the motor controller and the noise controller are connected with the VCU and controlled by the VCU; the motor controller is connected with and controls a motor, the output end of the motor is connected to aclutch through a speed reducer, and the clutch part of the clutch is connected and controlled by a manual gear controller; and the noise controller is connected to the VCU through a CAN bus, and the noise controller is correspondingly connected with a noise storage module and a noise player. According to the electric instructional car system for simulating the fuel car, a noise simulator is used for simulating car noise of the fuel car; and through cooperation of the clutch, the speed reducer and the manual gear, the car vibration effect of the fuel car under the conditions of starting, idling, accelerating, decelerating and the like is simulated. Students learning driving are helped to improve the uniformity of the students in the operation of the fuel car and electric cars.

The invention discloses a windshield wiper drive mechanism based on hydraulic swing. The windshield wiper drive mechanism based on hydraulic swing comprises a windshield wiper motor and a windshield wiper drive shaft and is characterized in that two gear rack swing oil cylinders are communicated and transmit torque through a hydraulic oil pipe, and the driving gear rack swing oil cylinder is provided with a positive and reverse rotation gear intermittent transmission mechanism. The windshield wiper drive mechanism based on hydraulic swing has the advantages that flexible duct hydraulic transmission is adopted in the windshield wiper driver mechanism of a windshield wiper, so the windshield wiper driver mechanism is large in transmission torque, small in size and quick in response; due to the flexible duct hydraulic transmission, the limitation for the windshield wiper driver mechanism during installation is small; in addition, due to a completely sealed structure, the windshield wiper driver mechanism is low in noise during working, and is especially suitable for external environments with complicated structures and long-distance transmission; the windshield wiper driver mechanism is not affected by the outside, overcomes the defects that the windshield wiper motor is burnt out due to external obstacles, effectively reduces in-car noise and improves inside comfort of a vehicle during operation.

The invention is a composite damping clutch for a hybrid car, belonging to the technical field of automobile components, which is characterized in that: a clutch cover assembly is fixed with a connecting ring I; a brake pad is fixed on a damping disk; arc-shaped grooves are arranged on the damping disk and the brake pad; a connecting link rivet passes through the arc-shaped groove to fix the connecting ring I and a connecting ring II, arc-shaped damping spring grooves are arranged on the connecting ring I and the connecting ring II and the damping disk for installing screens to fix a damping spring. The invention has the beneficial effects that: 1) the cars using the composite damping clutch mainly adopt electrical energy and can simultaneously use gasoline and electrical energy to supply power; 2) the start response of the car is greatly improved compared with that of the pure engine power cars with high accelerated speed; 3) the whole-car shocking is greatly reduced; 4) the whole-car noise is greatly lowered; and 5) the car is driven by a motor so as to not pollute environment.

The present invention provides a method and a system for determining reliable speech recognition coefficients in noisy environment, which can increase the recognition rate in a noisy environment, such as an in-car environment. The present invention utilizes the feature that most of the energy of in-car noise is concentrated in the low frequency band. Therefore, the input speech signal is filtered to remove the signal at the frequency range in which the noise energy is concentrated. Then, the energy contour of the speech signal is calculated, so as to determine the related speech recognition coefficients. Accordingly, the influence caused by the noise can be reduced, and the recognition rate for the noisy speech can be improved.

The invention relates to the technical field of automobile noise detection, and in particular, relates to a noise contribution analysis method, wherein the method comprises the following steps: acquiring test sound pressure of a target sound source position and an indication sound source position on each main noise part, local functions from each main noise part to the corresponding target sound source position and indication sound source position, and a global function from each secondary noise component to a response point; determining the acoustic load of each main noise component according to the test sound pressure and the local transfer function; according to the acoustic load of each main noise component and the equivalent correction function, obtaining an equivalent acoustic load of each main noise component equivalent to the secondary noise component; and according to the equivalent acoustic load and the global transfer function, solving the acoustic contribution of each sound source noise component under a set octave. The problems of high requirements on test equipment, high measurement difficulty and low test efficiency in the prior art can be solved.

The invention discloses an automobile noise isolation and adsorption device which is applied to an automobile, the automobile is provided with an automobile body and a shock absorber, the automobile noise isolation and adsorption device comprises a hydraulic cylinder, dampers, hollow covers and transmission vibrating diaphragms, the hydraulic cylinder is installed on the shock absorber, and the hydraulic cylinder synchronously stretches and retracts along with stretching and retracting of the shock absorber; the number of the dampers, the number of the hollow covers and the number of the transmission vibrating diaphragms are the same, each damper comprises a shell, a damping piston, a damping piston rod and a connecting block, a through hole is formed in each damping piston, each damping piston is movably installed in the corresponding shell, one end of each damping piston rod is connected with the corresponding damping piston, and the other end of the damping piston rod penetrates out of the shell. By combining the original shock absorber of the automobile, multiple noise reduction and shock absorption are realized, the noise reduction and shock absorption effects are good, the automobile runs more stably, and the noise is lower.