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Measuring head for operational testing of car suspension systems with vibroacoustic methods

Gardulski J.

Journal of KONES

2009

Vol. 16, No. 4

135-140

The article provides a discussion upon the structure of a measuring head designed and manufactured with the purpose of acquisition of data required by a diagnostic system for hydraulic telescopic shock absorbers of passenger cars operating based on vibroacoustic methods. The basis for the design development was a set of initial assumptions adjusted to the multidimensional methods of analysing vibration signals applied. For the design of the measurement track, a block diagram was proposed which was then extended by auxiliary electronic elements of the measuring system conforming with all the relevant requirements. The main components of the measurement track included: a three-axis sensor for vibration acceleration constructed based on one-axis converters, an angular displacement sensor usedfor measuring the rotation angle and linear velocity of a car and a laser road unevenness sensor. For the computer recording of the signals being measured, an analogue-digital cardwas used. The measuring head in question was mounted on a measuring trolley and then test and trial examinations were conducted while driving at various speeds up to 50 km/h in normal operating conditions. The repeatability of the measurement results obtained proved the measuring head's usability in testing.

Koncepcja numerycznego modelu geometrii torów w procesie napraw nawierzchni

Dobrowolski B.

Prace Instytutu Geodezji i Kartografii

2002

T. 49, z. 105

77--95

Artykuł omawia zagadnienia wymogów dokładnościowych wyznaczania geometrycznej osi torów przeznaczonych dla dużych szybkości pociągów. Zawiera także charakterystyką Kolejowej Osnowy Specjalnej i pomiarów osi torów w nawiązaniu do osnowy odpowiedniej do tych wymagań. Na koniec przedstawiona jest w zarysie koncepcja numerycznego modelu geometrii torów.

Author discusses in the article problem of geodetic service in the course of repairs of tracks used for fast trains. In order to understand better criteria of accuracy requirements, conceming determination of axes of tracks, and in conseąuence selection of geodetic methods fulfilling these reąuirements, author presents briefly basie definitions characterizing geometrical axis of track. In particular definition of curvature of geometrical track axis is important, as well as method of its measurement and related problems of long-wave deformations. Advantages and disadvantages of algorithms of programs applied for regulation of track axis, which use involute and geodetic coordinate systems, were discussed. Criterion of continuity of curvature is the most important for measurement accuracy of track axis. Joint application of this criterion with requirement of elimination of long-wave deformations of geometrical track axis creates strict accuracy conditions for measurements. These reąuirements are met by the Special Railway Control Network and hence by measurements of track axes attached to this network, discussed in this article. Furthermore, the problem is concentrated on geodetic service of track devices used for moving and lifting tracks, which also must meet high accuracy reąuirements. For these works "total station" or GPS receiver can be used. Author created the concept of digital model of track geometry, which includes sets of points of track axis and gauge of constructions extracted from digital railway map. Each repair would update the model and in conseąuence digital map. Fuli benefits from implementing the concept would be visible after improvement of height measurements with the use of GPS system.