The Project of Rail Inspection Car

1. Gauge Detection

Gauge detection is to measure the shortest distance between the two gauge points of the left and right rails in the same rail cross section at the wheel-rail contact point at 16mm inside the rail below the top surface of the actual rail.

 

2. Track Direction Detection

Rail direction detection is to measure the deviation of the gauge point on the inner side of the rail from the average position of the gauge point perpendicular to the track direction, and it is divided into two types: left and right rail directions (wavelengths are 1.5~42m, 1.5~70m).

 

3. High and Low Detection

The height detection is to measure the deviation of the top surface of the rail perpendicular to the track direction from the average position of the top surface of the rail.

 

4. Level Detection

Horizontal detection is to measure the height difference of the horizontal plane where the top surface of the left and right rails is located on the same track cross section, excluding the superelevation set on the circular curve and the superelevation slope on the transitional curve.

 

5. Super High Detection

Superelevation detection is to measure the difference between the design level of the top surface of the outer rail and the top surface of the inner rail in the curved section.

 

6. Triangular Pit (Distortion) Detection

The triangular pit detection is to measure the distortion of the track plane, and the algebraic difference between the front and back levels along the track direction.

 

7. Curvature Detection

Curvature detection is to measure the central angle 0 (/30m) corresponding to the curved track within the range of 30m (certain chord length). The larger the degree, the larger the curvature, and the smaller the radius; conversely, the smaller the degree, the smaller the curvature, and the larger the radius.

 

8. Vibration Acceleration Detection

Vibration acceleration detection is to measure the vibration frequency and amplitude of the rail inspection vehicle.

The vibration acceleration is determined by the interaction between the wheel and the rail. Under the premise of a certain speed, the value of the vibration acceleration is related to the amplitude of the track irregularity, the wavelength of the irregularity and the location of the irregularity.

The vibration acceleration is divided into the vertical vibration acceleration of the vehicle body, the horizontal (lateral) vibration acceleration of the vehicle body and the vibration acceleration of the axle box. The vertical vibration acceleration of the car body and the horizontal vibration acceleration of the car body are important indicators to evaluate the running stability and ride comfort of the vehicle; the vibration acceleration of the axle box is an important index to evaluate the wheel-rail action and noise, and it is also used to analyze the rail corrugation.

 

9. Gauge Change Rate Detection

The gauge change rate detection is to measure the ratio of the gauge difference to the distance, which is obtained by dividing the gauge difference actually measured by two points 2.5m apart by 2.5m. The gauge change rate directly affects the wheel-rail contact geometry, which affects driving safety and comfort.

 

10. Curvature Change Rate Detection

Curvature change rate detection is to measure the ratio of curve radius change, which is calculated by dividing the actual measured curvature difference of two points 18m apart by 18m.

 

11. Lateral (Horizontal) Acceleration Change Rate

The detection of the lateral acceleration change rate is determined by dividing the actual measured lateral acceleration difference between two points 18m apart by the 18m walking time.