RU2466046C1 - Method of diagnosing position of mounted axle in operated passenger and freight car bogie frame - Google Patents

Abstract

FIELD: transport.

SUBSTANCE: proposed method consists in defining tolerable lengthwise and crosswise clearances in bogie frame axle box guides. In compliance with proposed method, at least, two acoustic emission transducers are mounted on whatever surface of left and right rails, except for rail head surface, along the axis perpendicular to track direction, at the distance between each other equal to mounted axle weaving section period L defined by the formula:

where n is roll surface slope; s is half the distance between roll circles, m; r is wheel diameter, m; π equals 3.14. Arc segment of mounted axle wheel flange interacting with rail head inner face is calculated by the following formula: p = π · d · N · Δt, where: P is arc segment in mm, N is mounted axle revolutions per second, Δt is time of burst of continuous acoustic emission signals with maximum amplitude in s, π equals 3.14, D is wheel diameter in mm. Calculated arc segment of contact (friction) of wheel flange with rain head inner face is compared to tolerable standard magnitude.

EFFECT: higher validity and safety.

Description

The invention can be used to diagnose the position of wheelsets in the frame of the trolley of passenger and freight cars in operation, expressed in the assessment of the maximum longitudinal and transverse clearances in the axle boxes of the trolleys.

A known method of non-contact measurement of the geometric parameters of wheel pairs, which consists in laser non-contact control of the geometry of three-dimensional objects using triangulation position sensors, see Patent No. 2270120. The disadvantage of this measurement method is the inability to assess the maximum longitudinal and transverse clearances in the axle boxes of the trolleys.

The purpose of the invention is to increase the reliability of the diagnosis of the position of the wheel pairs in the frame of the trolley and to prevent the occurrence of the wheel pairs from rails.

The essence of the method is to measure the acoustic signals of acoustic emission on the right and left rail of the railway track during the passage of rolling stock in a given frequency band from 30 kHz to 300 kHz at equal, consecutive time intervals.

This method of diagnosing bearings differs from the method of diagnosis (patent No. 2270120) in that the sensors (transducers) of acoustic emission of at least two are mounted not on a damper that absorbs vibration, but on any surface of the right and left rail, except for the surface of the rail head of the rail track along the axis perpendicular to the direction of the railway track, at a distance from each other, equal to the size of the path period L of the tortuous movement of the wheelset according to the formula:

,

,

where n is the slope of the rolling surface;

s - half the distance between the riding circles, m;

r is the diameter of the wheel, m;

ν is the speed of movement, m / s;

π - 3.14,

during the passage of the rolling stock at the moment of contact of the wheel pair ridge segment with the inner face of the rail head, with a sampling frequency of 50 microseconds to 0.1 microseconds, the emission value of the maximum amplitudes of acoustic emission signals following sequentially and inextricably in time is determined; consecutive and time-continuous acoustic emission signals Δt and calculate the size of the arc of the ridge segment of the wheelset interacting with the inner face of rail dexter, according to the formula:

,

,

where P is the size of the arc of the segment in mm,

N is the number of revolutions of the wheelset in sec.,

Δt is the time duration of the emission of acoustic emission signals with a maximum amplitude following one after another inextricably in time in seconds,

π - 3.14,

D is the diameter of the wagon wheel in mm.

The excess of the calculated size of the arc of the segment of contact (friction) of the ridge of the wheel pair with the inner face of the rail head with a normative value is determined.

If the permissible value of the arc of the contact segment of the wheel pair of flanges with the inner face of the rail head is exceeded, which indicates the presence of unacceptable gaps in the axle boxes (longitudinal and transverse), the diagnostic device signals maintenance staff about the emergency condition of the wheel pair and the need for inspection and repair.

Example

The sensors of the diagnostic device are installed on the faces of the heads of the right and left rails at a distance from each other equal to the magnitude of the path of the period of tortuous movement of the wheelset, determined by the formula

At a speed of 60 km / h (16.6 m / s), the installation distance of the sensors on each rail will be equal to

The size of the arc of the ridge segment of the wheelset interacting with the inner face of the rail head is determined by the formula

Based on a comparison with the standard value, an unacceptable arc length of the wheel pair ridge segment is revealed, which indicates the need for inspection and repair.

Scope - railway transport, subway, industrial transport.

Claims (1)

A method for diagnosing the position of wheelsets in the frame of a carriage of passenger and freight cars in operation, which consists in measuring the acoustic emission signals of a rotating wheel pair, characterized in that the acoustic emission sensors (transducers) of at least two are mounted not on a damper that absorbs vibration, but on any surface of the right and left rail, except for the surface of the rail head of the railway track along an axis perpendicular to the direction of the railway track at a distance from each other equal to the size of the track the period L of the tortuous movement of the wheelset, which is determined by the formula:

where n is the slope of the rolling surface;
s - half the distance between the riding circles, m;
r is the diameter of the wheel, m;
π - 3.14,
during the passage of the rolling stock at the moment of contact between the wheel flange segment and the inner face of the rail head, with a sampling frequency of 50 microseconds to 0.1 microseconds, the emission value of the maximum amplitudes of acoustic emission signals following sequentially and inextricably in time is determined, the duration of the emission duration of the maximum, sequential and time-continuous acoustic emission signals Δt and calculate the size of the arc of the ridge segment of the wheelset, interacting with the inner face of ovki rail, according to the formula:
P = π · D · n · Δt,
where P is the size of the arc of the segment, mm,
n is the number of revolutions of the wheelset, s,
Δt is the time duration of the emission of acoustic emission signals with a maximum amplitude following one after another inextricably in time, s,
π - 3.14,
D is the diameter of the wheel of the car, mm,
the excess of the calculated size of the arc of the segment of contact (friction) of the ridge of the wheel pair with the inner face of the rail head with a normative value is determined.