Load estimation apparatus, load estimation method, and program

A load estimation apparatus comprising:

• an acceleration sensor attached to at least one of a first position on a bogie body supporting wheels or a second position on a vehicle body attached to the bogie body and configured to measure a first acceleration;
• and
• a control unit configured to estimate a load which is applied to the bogie body on the basis of load information and the first acceleration,
• wherein the load information stores an acceleration which is measured at least one of the first position or the second position in mechanism analysis in advance and in which a frequency of the acceleration is within a frequency band, a load with respect to the acceleration which is measured at the same time as the acceleration by a load sensor that is attached to the bogie body during the mechanism analysis, and the frequency band of the acceleration that is a band in which there is a correlation between an observation frequency of a frequency of an estimated load estimated from the acceleration measured in the mechanism analysis and an observation frequency of a frequency of the load measured in the mechanism analysis, associated with the first position or the second position at which the acceleration is measured in the mechanism analysis,
• wherein the acceleration sensor is attached to only the second position on the vehicle body,
• wherein the control unit is configured to correct the first acceleration when a frequency of the first acceleration which is acquired on the basis of a change with time of an acceleration acquired from the first acceleration is equal to or greater than fch×√2 where a frequency fch is a value which is determined on the basis of a spring constant of an air suspension connected between the bogie body and the vehicle body and a mass of the vehicle body, and
• wherein the control unit is configured to estimate the load which is applied to the bogie body on the basis of the corrected first acceleration.

A load estimation method comprising:

• a step of measuring a first acceleration using an acceleration sensor attached to at least one of a first position on a bogie body supporting wheels or a second position on a vehicle body attached to the bogie body;
• and
• a step of estimating a load which is applied to the bogie body on the basis of load information and the first acceleration,
• wherein the load information stores an acceleration which is measured at at least one of the first position or the second position in mechanism analysis in advance and in which a frequency of the acceleration is within a frequency band, a load with respect to the acceleration which is measured at the same time as the acceleration by a load sensor that is attached to the bogie body during the mechanism analysis, and the frequency band of the acceleration that is a band in which there is a correlation between an observation frequency of a frequency of an estimated load estimated from the acceleration measured in the mechanism analysis and an observation frequency of a frequency of the load measured in the mechanism analysis, associated with the first position or the second position at which the acceleration is measured in the mechanism analysis,
• wherein, in the step of estimating the load, estimating the load applied to the bogie by acquiring a load with respect to an acceleration corresponding to the first acceleration from the load information when a frequency of the first acceleration is within the frequency band associated with the first position or the second position at which the first acceleration is measured,
• wherein, when the position of the acceleration sensor indicates the first position that is a position on the bogie body, the frequency is less than a natural frequency fch×√2 where fch is a value which is determined on the basis of a spring constant of an air suspension connecting the vehicle body and the bogie body and a vehicle body mass, and
• wherein, when the position of the acceleration sensor indicates the second position that is a position on the vehicle body, the frequency is equal to or greater than fch×√2.

A non-transitory computer readable medium that stores a program causing a computer of a load estimation apparatus to perform:

• a step of measuring a first acceleration using an acceleration sensor attached to at least one of a first position on a bogie body supporting wheels or a second position on a vehicle body attached to the bogie body;
• and
• a step of estimating a load which is applied to the bogie body on the basis of load information and the first acceleration,
• wherein the load information stores an acceleration which is measured at at least one of the first position or the second position in mechanism analysis in advance and in which a frequency of the acceleration is within a frequency band, a load with respect to the acceleration which is measured at the same time as the acceleration by a load sensor that is attached to the bogie body during the mechanism analysis, and the frequency band of the acceleration that is a band in which there is a correlation between an observation frequency of a frequency of an estimated load estimated from the acceleration measured in the mechanism analysis and an observation frequency of a frequency of the load measured in the mechanism analysis, associated with the first position or the second position at which the acceleration is measured in the mechanism analysis,
• wherein, in the step of estimating the load, estimating the load applied to the bogie by acquiring a load with respect to an acceleration corresponding to the first acceleration from the load information when a frequency of the first acceleration is within the frequency band associated with the first position or the second position at which the first acceleration is measured,
• wherein, when the position of the acceleration sensor indicates the first position that is a position on the bogie body, the frequency is less than a natural frequency fch×√2 where fch is a value which is determined on the basis of a spring constant of an air suspension connecting the vehicle body and the bogie body and a vehicle body mass, and
• wherein, when the position of the acceleration sensor indicates the second position that is a position on the vehicle body, the frequency is equal to or greater than fch×√2.