In a method for determining conditions of a road and a tire, a measurement of a sound signal produced by the tire running on the road during a timeframe is recorded, and a spectral density of a power of the sound signal over a frequency interval is determined. The frequency interval is segmented into frequency bands, and each frequency band is associated with a representative data element representing a mean acoustic power measured in the frequency band. The representative data elements obtained from the measurement form variables of a vector associated with the measurement. A road condition and a tire condition are determined via a discriminant analysis of the representative data elements using a learning base. Each representative data element is obtained by finding a ratio between a mean acoustic power measured in a corresponding frequency band and a total acoustic power measured over an entirety of the frequency interval.

A method for monitoring performance of at least one component on a moving platform, the method including receiving sensor data for the at least one component, along with supplemental data, at a processing node; and processing the sensor data, the processing using the supplemental data to filter the sensor data.

An apparatus for airborne-sound-based condition monitoring of a device includes at least one microphone assigned to each component of a plurality of components of the device that is to be monitored.

In order to obtain information about a salt-state of a road independently of drivers, a method that generates information about the salt-state of a road is specified that includes a determination of salt-state-dependent measurement values, processing of the measurement values into information about the salt-state of the road and outputting of the information about the salt-state of the road. A corresponding device that generates information about the salt-state of a road comprises sensors that determine of salt-state-dependent measurement values, a processing unit that is configured to process determined measurement values into information about the salt-state of the road, and output the information about the salt-state of the road.

An impact-acoustic method for testing a tire is provided along with a tire anomaly detection system in which an actuatable impactor is provided with an acoustic transducer and a force transducer. A plurality of discriminator quantities is calculated from acoustic signals and force signals and the calculated discriminator quantities are compared with stored discriminator quantities to determine whether an anomaly is present in the tire.

A viscoelastic characteristic measurement apparatus (1) according to the present invention includes: a sample deforming unit (11) that applies an external force to a measurement sample (S) to impose a cyclic deformation; a first viscoelastic characteristic calculation unit (15) that calculates a low-frequency viscoelastic characteristic of the measurement sample (S) based on stress acting on the measurement sample (S) that has been deformed by the sample deforming unit (11) and distortion of the measurement sample (S); an emission unit (12) that emits an incident sound wave to the measurement sample (S); a receiver (12) that receives a reflected sound wave generated as a result of reflection of the incident sound wave emitted from the emission unit (25) in the measurement sample (S) or a transmitted sound wave generated as a result of transmission of the incident sound wave through the measurement sample (S); and a second viscoelastic characteristic calculation unit (15) that calculates a high-frequency viscoelastic characteristic of the measurement sample (S) at a frequency of the incident sound wave based on the reflected sound wave or the transmitted sound wave received by the receiver (25).

A method for determining a running parameter of a vehicle travelling on a road, based on a measurement of a sound signal produced by a tire of the vehicle, and on measurements and estimations of running conditions effected in real time.