Track gauge dynamic measurement based on 2d laser displacement sensor
Track irregularities can cause deterioation of riding comfort and derailment. Track gauge variation is one of the basic track irregularities. Track Recording Car is an automated track inspection vehicle on a rail transport system used to test several geometric parameters of the track. Track geomeotry parameters generally measured include position, speed, gauge, alignment, crosslevel, curvature and so on. This paper presents a novel technique for the measurement of track gauge variation, a new measurement system was introduced and been in assembled on a new type underground track recording car.
An Algorithm for Inspecting the Number of Self Check-In Airline Luggage Based on Hierarchical Clustering
Airport passengers are required to put only one baggage each time in the check-in self-service so that the baggage can be detected and identified successfully. In order to automatically get the number of baggage that had been put on the conveyor belt, dual laser rangefinders are used to scan the outer contour of luggage in this paper. The algorithm based on hierarchical clustering is proposed to inspect the number of airline luggage. Firstly, the laser point cloud data of the luggage surface is preprocessed to filter the background and noise. Secondly, the point cloud is projected to vertical direction. By the analysis of one-dimensional clustering, the number of luggage will be quickly computed. If it cannot be distinguished in this dimension, the method of nearest hierarchical clustering is applied to divide the point cloud. It can preferably solve the difficult issue like crossing or overlapping pieces of baggage. Finally, many experiments in different cases have been done to verify the effectiveness of the algorithm.
TRACK IRREGULARITY INSPECTION METHOD BY COMMERCIAL RAILWAY VEHICLES
At present, track irregularity inspection is done by track inspection cars on conventional as well as Shinkansen lines. One of the track irregularity inspection methods conceivable in the future is use of commercial railway vehicle, which method realizes a more frequent and labor saving inspection. This paper looks at an on board system without an operator coupled with a ground system. It is clear that an inertial measuring method or a first order differential method is available; it is possible to obtain the output by mid-chord offset; and it is possible to reduce on board processing and data transfer volume through division of jobs into irregularity inspection and processing.