60 results about "Roadway noise" patented technology

Road noise is reduced without locally storing noise spectrum patterns for determination or without detecting the present position of a vehicle from the device. An in-vehicle hands-free device causes a cellular phone to detect the present position of the vehicle and transmit the position to a server. The server determines a noise spectrum pattern corresponding to the road surface on which the vehicle is presently running. The noise spectrum pattern is based on the present position of the vehicle received from the in-vehicle hands-free device and road information. The server transmits the noise spectrum pattern to the in-vehicle hands-free device whereupon a noise canceling signal is superimposed on a received signal. The noise canceling signal is based on an inverted noise spectrum pattern that is obtained by inverting the phase of the noise spectrum pattern. The resulting composite signal is output from a speaker.

A vehicular active vibratory noise control apparatus includes an adaptive notch filter (second control signal generating unit) for generating a corrected error signal representative of a road noise only by removing the component of a rotational frequency (the component of an engine muffled sound) from an error signal, generates a first control signal from the corrected error signal and a reference signal, and reduces the component of the rotational frequency (engine muffled sound) at a position where a microphone is located (evaluating point).

Road noise masking for a vehicle includes determining, by a computer processor, an expected interior sound associated with the vehicle. The expected interior sound is defined by a design of the vehicle in conjunction with road conditions encountered by the vehicle. The road noise masking also includes monitoring, via the computer processor, information sources of the vehicle during a driving event. Upon determining a current road surface from the monitoring, the road noise masking includes calculating a masking noise shape commensurate with the expected interior sound, and transmitting instructions including the masking noise shape to an audio system in the vehicle. The audio system produces masking noise from a tuner of the audio system that approximates the masking noise shape.

A vehicle noise canceller includes a road surface condition observation unit, a speaker, and an operation controller. The road surface condition observation unit is configured to observe road surface conditions in a traveling direction of a vehicle. The speaker is configured to generate a canceling sound for canceling road noise entering a vehicle cabin of the vehicle. The operation controller is configured to control the canceling sound generated from the speaker on a basis of information received from the road surface condition observation unit.

The invention discloses an urban road traffic noise prediction method comprising the following steps: vehicle noise parameters of each vehicle passing by an observation point on a road can be obtainedaccording to a preset period of time in a set time window, a traffic flow of the observation point is recorded, and corresponding vehicle-road noise characteristic data is searched and obtained according to the vehicle noise parameters and pre-obtained road noise parameters of the road; according to the traffic flow and the vehicle-road noise characteristic data, a transient sound pressure levelpredicted value of the observation point at all time points can be calculated, and the transient sound pressure level predicted value can be converted into an equivalent continuous sound pressure level predicted value. The invention also discloses an urban road traffic noise prediction system. The urban road traffic noise prediction method and system are suitable for predicting noise of all kindsof urban roads, high prediction precision can be realized, and reliable decision bases can be provided for urban planning and land planning.

A sound absorbing structure is constituted of a vibration plate and a rear air layer and is installed in a luggage compartment or trunk which is separated from a cabin in a vehicle. Sound waves entering into the luggage compartment drive the vibration plate to vibrate so that acoustic energy is converted into mechanical energy and is consumed by way of vibration of the vibration plate. By appropriately setting parameters and dimensions, the sound absorbing structure efficiently absorbs low-frequency sound such as road noise occurring due to friction of wheels of the vehicle traveling on a road.

The invention relates to a noise map construction method based on a building surface noise model (BSNM). The noise map construction method comprises the steps of acquiring road streetscape data, evaluating noises of spatial points of buildings on two sides of a road, processing the road streetscape data, rendering a road streetscape data map and constructing a noise map. By means of the acquired road noise, noises of the buildings on two sides of the road are evaluated, the BSNM is constructed, a building noise multi-spectrum map is embedded into the surfaces of the corresponding buildings in the noise map, and a visual BSNM is presented. The noise map construction method has the advantages that by means of the noise map construction method, the map capable of representing urban street noises faithfully is constructed for users, and users can experience street noise pollution really.

An apparatus and system for addressing road noise are provided. The apparatus is configured to determine at least one from among a location of a vehicle and a noise feature of a road on which the vehicle is traveling, retrieve road noise cancellation information based on the determined at least one from among the location of the vehicle and the noise feature of the road on which the vehicle is traveling, and output a signal to cancel road noise based on the road noise cancellation information. The apparatus may be installed in vehicle to address road noise heard by occupants of the vehicle.

The invention discloses an active control system and method for automobile road noise and an automobile system. The active control system comprises a vibration sensor, a microphone, a loudspeaker anda controller. The vibration sensor and the microphone are both connected with the input terminal of the controller, and the loudspeaker is connected with the output terminal of the controller. The vibration sensor is used for collecting a road excitation signal generated by interaction of a road surface and wheels; the microphone is used for collecting an error noise signal in a vehicle and sending the signal as a feedback signal to the controller; the controller processes the error noise signal and the road excitation signal so as to update the time domain coefficient of adaptive filtering, and the controller is used for carrying out adaptive filtering processing on the road excitation signal and generating an offset noise signal. According to the invention, the convergence rate of the RNC system can be effectively increased when the vehicle driving working condition changes, and continuous updating of main control parameters of the RNC system is achieved based on the cloud.

The invention discloses an urban road greenbelt noise reduction guiding optimization control method based on a 3D noise map, and the method comprises five steps: road selection, current noise actual measurement, 3D noise map construction, noise evaluation, and noise reduction module matrix building. The 3D noise map construction is the data simulation for the whole measurement region difference calculation based on actual measurement noise data. The noise evaluation is the standardized judgment of the noise value of a road according to the traffic noise standard of the road. A noise reduction module matrix comprises a noise reduction road greenbelt land module, a noise reduction guide structure module, a noise reduction guide facility equipment module and a noise reduction guide plant configuration module, and three types of targeted suggestions are proposed according to the width condition of a noise reduction road greenbelt land. The method saves the treatment cost after a road is constructed and put into use, reduces the impact on the surroundings from the urban road noises, and can minimize the noise pollution caused by various types of urban roads.

An example active road noise control includes generating with a sensor arrangement a primary sense signal representative of at least one of accelerations, motions and vibrations that occur at a firstposition, and providing a noise reducing signal by processing the primary sense signal according to an adaptive mode of operation or a non-adaptive mode of operation. It further includes generating within the vehicle body noise reducing sound at the second position from the noise reducing signal, evaluating the primary sense signal and controlling the processing of the primary sense signal so thatthe primary sense signal is processed in the adaptive mode of operation when the magnitude of the primary sense signal undercuts a first threshold and in the non-adaptive mode of operation when the magnitude of the primary sense signal exceeds a second threshold, the first threshold being equal to or smaller than the second threshold.

A noise filtering road planning device is applied to outdoor riding of sports enthusiasts, and comprises a navigator and a server; the navigator is provided with a protocol module and a sound sensor, the sound sensor is used to detect road noise values of roads, the navigator can display the road noise values; the server is provided with a protocol module, the server is connected with the navigator through the protocol module, the navigator uploads the road noise values to the server, and users download the road noise values from the server. By use of the noise filtering road planning device, before exercises of a user, the classification situation of the road noise values firstly is downloaded from the server, then a road between a movement start point and a movement end point is rationally planned in accordance with the from-low-to-high level of the road noise values, by use of the noise filtering road planning device, the sports enthusiasts avoid high noise roads, and select an optimal sports environment.

A method for reducing tire to road noise generated by vehicles on a road surface comprises generating a pseudorandom unique line pattern, providing said pattern as transverse grooves disposed in the road surface, said grooves being randomized according said line pattern as to one or more of position, frequency, and depth so as to spread the noise spectrum thereby reducing the amplitude or volume of noise generated at any single frequency and are capable of dramatic reductions in noise generated by high speed traffic on roadways. It can be implemented by conventional construction practice at little or no additional cost and eliminates the need for costly structures such as noise barrier fencing in residential areas.

A method of masking road noise for a vehicle includes monitoring, through a processor, one or more vehicle mounted transducers for noise produced by an interaction between the vehicle and a road surface, detecting, through the processor, an audible signal having one of an undesirable frequency and an undesirable magnitude associated with the interaction between the vehicle and the road surface, generating, through the processor, a masking signal having a frequency that will mask the audible signal having the one of the undesirable frequency and undesirable magnitude, and emitting the masking signal through one or more vehicle speakers.

The invention relates to a reference signal selection method for automobile road noise active control. The reference signal selection method comprises the following steps: step 1, determining main noise peak values: selecting K main noise peak values and corresponding frequencies; 2, optimizing the position of a reference point: sorting the reference signals according to a constant coherence coefficient for each frequency; and 3, optimizing the number of the reference points: determining the optimal number of the reference points corresponding to each frequency according to the multiple coherence coefficient increment, and determining the optimal number of the reference points of the full frequency band by utilizing a multiple coherence function, thereby obtaining available reference signals. According to the invention, the method for selecting the reference signals for active control of road noise is systematically explained, the optimization of the positions and the number of the reference signals can be obtained, and the defects in the prior art are overcome.

A method for reducing tire to road noise generated by vehicles on a road surface comprises generating a pseudorandom unique line pattern, providing said pattern as transverse grooves disposed in the road surface, said grooves being randomized according said line pattern as to one or more of position, frequency, and depth so as to spread the noise spectrum thereby reducing the amplitude or volume of noise generated at any single frequency and are capable of dramatic reductions in noise generated by high speed traffic on roadways. It can be implemented by conventional construction practice at little or no additional cost and eliminates the need for costly structures such as noise barrier fencing in residential areas.

The invention provides a road noise visualization evaluation method based on BIM and GIS, and relates to the field of environmental protection engineering. The road noise visualization evaluation method based on BIM and GIS comprises the following steps: S1, detecting a road noise propagation rule; S2, establishing a corresponding noise weakening model; S3, establishing a space model; S4, performing data input; S5, performing a contrast experiment; S6, correcting the simulation experiment; S7, performing road noise simulation; and S8, watching and analyzing the data. By modeling a road project and the surrounding environment, the noise distribution on the whole road line is intuitively represented in a simulation form, and a noise topographic map of the road project is constructed, so that the noise influence is visualized, the working hours can be greatly shortened, the heavy calculation work of environmental assessment workers is reduced, the working efficiency of environmental assessment workers is improved, and the accuracy and scientificity of environmental assessment results are improved, so that more accurate noise influence prevention and control are realized.

An active road noise control method in an active road noise controller disposed in a vehicle may include diagnosing whether a plurality of microphones connected in a daisy chain has failed, receiving a data frame from the plurality of microphones, identifying normal information related to information included in the data frame based on a result of diagnosis, generating a digital noise control signal using the identified normal information, and transmitting the generated digital noise control signal to an external amplifier.

An active road-noise control system and method include using a sensor arrangement to generate a first sense signal representative of at least one acceleration, motion and/or vibration that occurs at afirst position on a vehicle body and a second sense signal representative of sound that occurs at a second position within the vehicle body; they also provide a noise-reducing signal by processing the sense signals according to a first or a second mode of operation. They include the generation of noise-reducing sound within the vehicle body at the second position from the noise reducing signal and the operational state of the sensor arrangement; the first sense signal and the second sense signal are processed in the first mode when the sensor arrangement is in a proper operational state and in the second mode when a malfunction of the sensor arrangement has been detected.