131 results about "Interior noise" patented technology

The invention discloses an interior noise analysis and prediction method of a high speed train. The method comprises the following steps: establishing a train reconditioning train body model, a statistical energy analysis model of a body in white structure and an interior and exterior vocal cavity statistical energy analysis model, and carrying out simplification and subsystem division; obtaining the statistical energy analysis parameters of the train body structure and an interior vocal cavity model, and loading the statistical energy analysis parameters onto a train body structure model plate subsystem and a vocal cavity model subsystem; and obtaining exterior vocal excitation source energy borne on the train body, applying the exterior vocal excitation source energy onto the exterior vocal cavity statistical energy analysis model, causing the exterior vocal excitation source energy to reach an interior vocal cavity after the exterior vocal excitation source energy is attenuated by the sound insulation property of a structural plate in a body in white structure model so as to obtain structural noise energy radiated into the train by the reconditioning train body under the function of the two-line suspension force of a compartment, and then, carrying out interior noise analysis and prediction. The problem that the interior noise of the train is difficult in prediction and the problems of the upper limit boundedness of a frequency domain, complex calculation flow, incomplete motivation consideration in the traditional method are overcome, calculation efficiency and prediction accuracy are improved, and development and test cost is lowered.

The invention relates to a noise source identifying and testing method for high speed train. The method comprising the following steps: partitioning noise sources into a steering frame wheel track noise testing area, an equipment noise testing area, a pantograph noise testing area and a pneumatic noise testing area; distributing testing points respectively according to the transmission paths of air sound and structure sound in each area; acquiring testing point data; analyzing through sound and vibration transmission paths; separating the air sound from the structure sound; calculating the contribution of each noise source to interior noise. According to the noise source identifying and testing method, sound sources and vibration sources causing interior noise of the high speed train can be identified, the contribution of each noise source and each vibration source to the interior noise is determined, sound source control and path control of the interior noise are realized fundamentally, and a scientific basis is laid for the vibration and noise reduction structural design of the high speed train.

A text-to-speech (TTS) system implemented in an automotive vehicle is dynamically tuned to improve intelligibility over a wide variety of vehicle operating states and environmental conditions. In one embodiment of the present invention, a TTS system is interfaced to one or more vehicle sensors to measure parameters including vehicle speed, interior noise, visibility conditions, and road roughness, among others. In response to measurements of these operating parameters, TTS voice volume, pitch, and speed, among other parameters, may be tuned in order to improve intelligibility of the TTS voice system and increase its effectiveness for the operator of the vehicle.

The invention discloses an interior noise electronic active inhibition system, which comprises an acoustic sensor, a signal conditioning module, an analog/digital (A/D) conversion module, an electronic control unit (ECU), a digital/analog (D/A) conversion module and a loudspeaker, wherein an automobile noise signal acquired by the acoustic sensor is trimmed by the signal conditioning module, is converted by the A/D conversion module and is input into the ECU; the ECU performs spectral analysis on the signal, separates the frequency band sensitive to the ears of a human body, detects the waveform through a Fourier algorithm and extracts noise envelope, so that waveform approximately similar to the noise waveform is formed and is subjected to reversal processing; and the inverse phase noise processed by the ECU is converted into a sinusoidal analog signal through the D/A conversion module and is input everywhere by the loudspeaker to be superposed with the automobile noise, and the aim of actively inhibiting the interior noise is fulfilled. The interior noise is actively inhibited through an active noise control method.

The invention discloses double anti-wear automobile lubricating oil. The lubricating oil comprises, by mass, A), 35-94 parts of a low-viscosity base oil having a high viscosity index, B), 2-15 parts of a engine oil composite agent, C), 0.01-3 parts of a organic molybdenum mixture, D), 0.5-5 parts of a saturated and high-viscosity complex lipid, E), 0.5-10 parts of a diester, F), 0.5-10 parts of ahigh-viscosity polyolefin, G), less than or equal to 2 parts of a alcohol blocked phenolic ester having high molecular weight and H) 2-10 parts of a viscosity index improver with high shearing performance. The double anti-wear automobile lubricating oil provided by the present invention is used for engines of the automobiles, such that starting wear of the engine is substantially improved, the wear of the engine in a operation condition of high rotary speed and high torsional moment is reduced. In addition, according to the present invention, a starting noise level is reduced by 12%; an outside noise level is reduced by 6.8% and an interior noise level is reduced by 8.4% during a high-speed operation; a oil change period of the engine oil is prolonged more than one time.

The invention discloses a method for detecting a transmission path of vehicle interior rumbling sound during acceleration, and the method comprises the steps: collecting a vehicle interior noise value during the acceleration of an engine; extracting a vehicle interior noise peak value from the vehicle interior noise value; carrying out the order analysis according to the vehicle interior peak value, and determining the vibration frequency of the vehicle interior peak value; presetting a noise transmission path, carrying out order analysis of parts at all paths, determining a part with the vibration frequency, corresponding to a vibration order peak value, being consistent with the vibration frequency of the vehicle interior peak value, and enabling the part to serve as a part with a high correlation degree; changing the modal characteristics of the part with the high correlation degree, and collecting the vibration order peak value of the part with the high correlation degree and the vehicle interior noise peak value; and determining the transmission path where the part with the high correlation degree is located as a rumbling sound transmission path if the vibration frequency corresponding to the vibration order peak value and the vibration frequency corresponding to the vehicle interior noise peak value has set offsets at the same time. The method reduces the detection time of the rumbling sound, and also improves the detection precision.

A tire for vehicles offering low rolling resistance wherein the ground-contact surface area is variable as a portion of the tread part can be retracted and/or extended using pneumatic, mechanical or hydraulic force to withdraw from, or come into contact with the road surface before, during or after operation permitting more efficient operation wherein the material used within the tread part that retains contact with the road may generally have a smaller internal friction loss than the material used in conventional tires and the rolling resistance is thereby reduced when the retractable portion of the tread is selectively withdrawn from contact with the road surface furthermore achieving a smaller ground-contact patch footprint. The achieved object of a tire with a lower rolling resistance yields improved fuel consumption efficiency. Improvements in exterior and interior noise levels and a reduced tendency to exhibit hydroplaning action are also attained with a variable groove volume to tread surface-contact ratio. Within one embodiment of the present invention, an automated microcomputer-based tire control system is disclosed useable to command the motion of the moveable tread portion of the said tire in response to various operational scenarios.

A method for calculating vehicle interior noise comprises steps as follows: finite element models of a vehicle frame, a transmission shaft and a rear axle of an automobile are established respectively, and benchmarking is performed between the finite element models and corresponding actually measured modes; modal calculation is performed on the finite element models of the vehicle frame, the transmission shaft and the rear axle after benchmarking, and modal calculation results are imported into a pure rigid multi-body model of a vehicle for establishment of a rigid-flexible coupled model; the rigid-flexible coupled model is subjected to time-domain response analysis, so that loads at connecting points during engine mounting are acquired; a transfer function from each connecting point to a target position in the vehicle is acquired; the noise pressure level from each connecting point to the target position is calculated according to the load of the corresponding connecting point and the corresponding transfer function. The accurate load data of each connecting point is extracted through the rigid-flexible coupled model of the vehicle, and the accurate noise pressure level in the vehicle is acquired in real time in the time domain of each connecting point during engine mounting in combination with the corresponding transfer function.

In pressure increasing control for raising a pressure within a sealed type fuel tank from an excessive negative pressure to a low negative pressure, an opening or closing operation of a sealing valve, when the interior of a vehicle is very quiet, may cause the working noise thereof to be transmitted to a passenger, thereby deteriorating the noise characteristic. When the pressure within a fuel tank is below a predetermined negative pressure near a saturated vapor pressure of the fuel and an interior noise level is equal to or greater than a threshold value, a controller may operate a sealing valve to thereby raise the pressure of the fuel tank to a normal negative pressure region which may be higher than the predetermined negative pressure.

The invention discloses an active control noise reduction method and system for interior noise of an automobile. The system comprises a vehicle information identification system, an interior environment monitoring system, a vehicle vibration collecting system and an active control system. By utilizing an active control method, the disturbance of structural noise caused by engine excitation and road excitation to interior passengers is effectively reduced, the interior sound quality of the automobile is greatly improved, and more comfortable riding environment is provided for the passengers.

The invention relates to a method for predicting psychoacoustic parameters in a high-speed train based on statistical energy flow analysis. The method comprises the steps of: acquiring high-speed train exterior noise source excitation; conducting a sound insulation test on a high-speed train body structure sample piece; conducting an internal loss factor test on a high-speed train interior sound cavity; conducting an internal loss factor test on high-speed train interiors; predicting a sound pressure level inside the train by utilizing a statistical energy flow analysis method; and calculating and analyzing psychoacoustic objective parameters in the high-speed train. The method has the beneficial effects that the method for high-speed train interior noise simulation and modeling analysis and interior psychoacoustic objective parameter prediction is provided, is more rapid and accurate when compared with prediction methods utilizing a BP neural network and the like, and is more suitable for engineering practice.

The invention relates to the field of nonwoven fabric materials for automotive interiors, particularly a sound-absorption sound-insulation needle-punched nonwoven fabric for car trunk carpets and wheel cowl carpets and a preparation method thereof. The nonwoven fabric comprises a surface fabric and a base fabric, wherein the base fabric comprises a first base fabric and a second base fabric; the first base fabric and second base fabric are respectively prepared by mixing 30-40 parts by mass of polyester fibers with the titer of 1.5-8D, 25-35 parts by mass of waste cotton fibers, 15-20 parts by mass of polypropylene fibers and 15-20 parts by mass of low-melting-point fibers; the first base fabric is compounded with the second base fabric by needle punching; and the needle punching density is 300-500 needles/cm<2>. Compared with the prior art, the thin natural fibers are added to increase the surface density of the nonwoven fabric and reduce the porosity in the nonwoven fabric; and needled felt pieces with different densities and thicknesses are subjected to needling compounding and heat bonding to form the multilayer composite material, thereby obstructing the outside noise while absorbing the interior noise and improving the internal environment more effectively.

The invention provides a method of reducing interior noise and improving a voice recognition rate. The method of reducing the interior noise and improving the voice recognition rate includes the steps: S1, processing recorded voice, conducting analog to digital (A/D) conversion, obtaining and storing a voice digital quantity; S2, extracting the voice digital quantity and comparing the voice digital quantity with a preset voice sample, and obtaining a comparison result; S3, executing the comparison result and feeding the comparison result back to a user. The invention further discloses a device and equipment of reducing the interior noise and improving the voice recognition rate. The device of reducing the interior noise and improving the voice recognition rate and equipment of reducing the interior noise and improving the voice recognition rate solve the problem that in an environment with noisy vehicles, the voice recognition rate of a vehicle navigation is low, guarantee the precise voice recognition rate in a complex speech environment and improve reliability and stability of the voice recognition system in a vehicle navigation sound, and meanwhile can be used in voice control systems of other electronic industries.

The invention relates to a piezoelectric air pump which comprises an outer shell and a piezoelectric assembly arranged in the outer shell. An air inlet channel and an air outlet channel are formed in the outer shell, and a noise reduction cavity is formed between the piezoelectric assembly and the outer shell; and at least one noise reduction plate is arranged in the noise reduction cavity, and each noise reduction plate is provided with at least one through hole penetrating through the noise reduction plate. The piezoelectric air pump is small in internal noise and high in heat dissipation efficiency.

The invention provides an active noise reduction method and device for a vehicle and belongs to the technical field of noise control. The active noise reduction method comprises the following steps: arranging at least one reference microphone at the side body of the vehicle, and collecting window noise of a vehicle window by utilizing the reference microphones; arranging at least one control sound source at a window frame of the vehicle window, and utilizing the control sound source to emit a sound signal for counteracting the window noise; obtaining a reference signal according to the window noise collected by each reference microphone; and superposing the reference signal and the sound signal emitted by the control sound source and calculating control gain of reedforward ANC control to enable sound power of the superposed sound signals to be minimum. The noise reduction method can significantly decrease interior noise of the vehicle under a window-open state, reduces ear sound pressure of a driver and passengers and improves vehicle-taking experience and driving comfort.

The invention discloses a vehicle noise index decomposition method, device and system for a rail transit vehicle and a computer readable storage medium. The vehicle noise index decomposition method comprises the steps that noise indexes of various noise components of the vehicle in an initial state are acquired; according to the noise indexes of the noise components, interior noise and exterior noise of the vehicle are calculated, and predicted values of the vehicle noise indexes are obtained; whether the predicted values of the vehicle noise indexes meet the corresponding preset conditions ornot is judged, and if yes, a next step is entered and the current noise indexes of the noise components in the vehicle are output; and if no, the noise indexes of the noise components corresponding to the vehicle noise indexes which do not meet the corresponding preset conditions are modified to update the noise components of the vehicle, and the step of acquiring the noise indexes of the noise components of the vehicle in the initial state is returned and performed until the predicted values of the vehicle noise indexes meet the corresponding preset conditions. The vehicle noise index decomposition method, device and system for the rail transit vehicle and the computer readable storage medium are conducive to improving vehicle performance and reducing the operation difficulty and costs of the vehicle in a later stage.

The invention provides an automobile carpet capable of enhancing sound insulation. The automobile carpet comprises a PET/PP (Polyethylene Terephthalate/Polypropene) composite layer, wherein a PE film layer is arranged on the front surface of the PET/PP composite layer; a PP film layer is arranged on the back surface of the PET/PP composite layer; a PET fabric layer is arranged on the front surface of the PE film layer; a PET non-woven fabric layer is arranged on the back surface of the PP film layer; an antistatic layer is arranged on the front surface of the PET fabric layer; an anti-sliding layer is arranged on the back surface of the PET non-woven fabric layer; anti-sliding lines are arranged on the anti-sliding layer; and a waterproof and ventilated layer is arranged on the front surface of the antistatic layer. The invention further provides a manufacturing method of the automobile carpet capable of enhancing sound insulation; the automobile carpet capable of enhancing sound insulation, provided by the invention, has excellent sound insulation and strength; sound absorption and sound insulation are combined so that inner noises of an automobile are effectively reduced; furthermore, the automobile carpet capable of enhancing sound insulation, provided by the invention, has very light weight and also has a good anti-sliding effect; and the antistatic performance and the waterproof and ventilated performance of the carpet are enhanced on the basis.

The invention discloses a vibration absorber assembly for an automobile engine. A mounting support consists of a first mounting plate, a second mounting plate and a third mounting plate. The cross section of the third mounting plate is 'L'-shaped, and a weight is fixedly connected with the right surface of a vertical side of the third mounting plate. The cross section of the first mounting plate is 'V'-shaped, and one side of the first mounting plate is in positioning connection with the left surface of the vertical side of the third mounting plate. The cross section of the second mounting plate is 'V'-shaped, and one side of the second mounting plate is in positioning connection with the lower surface of a horizontal side of the third mounting plate. Using the vibration absorber assembly can further reduce interior noise of the automobile, and the mounting support is not easy to break when stressed by larger force, while vibration resistance is improved.

The present invention provides a pneumatic tire that has a tire structure modified to reduce the road noise and thereby reduce the car interior noise and that exhibits improved high-speed drivability and improved high-speed durability. The pneumatic tire includes a circular tread, a pair of sidewalls and beads on both sides of the tread, and a carcass extending between bead cores within the pair of beads. A rubber layer having a modulus of elasticity at 100% elongation in the range of 1.0 MPa to 30 MPa and a thickness in the range of 2.0 mm to 5.0 mm is placed inside the carcass and at at least part of a portion around the center of the tread.

The invention discloses a prediction method for subjective scoring on interior noise during vehicle acceleration. The method comprises the following steps of: step 1, collecting signals wherein soundpressure levels of an acceleration noise and a multi-level acceleration noise in ears change with the engine speed during the vehicle acceleration process and storing the signals; step 2, calculatinga noise kurtosis according to the current engine speed and the sound pressure level, and calculating a normalized noise kurtosis and a maximum normalized noise kurtosis through the noise kurtosis; andstep 3, calculating a subjective prediction score of the noise corresponding to different rotation speeds during the vehicle acceleration process and a total value of the subjective evaluation and prediction scores in the whole acceleration process according to the noise kurtosis, and obtaining an acceleration noise evaluation condition according to a standard scoring table. The invention adoptsthe determined objective evaluation method based on a real vehicle measurement, so that the uncertainty is greatly reduced for the traditional subjective evaluation, the problems can be quickly and accurately identified or the nuances can be compared, and the reference is high.

A system for controlling vehicle interior sound using a smart phone and a method thereof include a driving information provider to provide driving information while a vehicle is being driven. A smart phone includes a microphone which senses interior noise or sound of the vehicle and generates a sound control signal to diminish or amplify the interior noise based on the driving information from the driving information provider. An audio amplifier amplifies the sound control signal received from the smart phone and outputs an amplified signal though a speaker.

The invention provides a method for decomposing an automobile interior noise development objective into subsystem design indexes. According to the method, the subsystem design indexes are continuously adjusted to approach a complete vehicle development objective by utilizing a transfer path analysis synthesis algorithm through step-by-step iteration, and in the process, engineering actual constraints are taken into account, so that accurate conversion from the complete vehicle development objective to the subsystem design indexes is achieved. The method is simple, the objective decomposition efficiency of automobile interior noise is higher, the uncertainty relying on personal experience is avoided, and the problem that an objective is difficult to decompose in the initial stage of automobile development is better solved.