Metrologi och mätning. Fysikaliska fenomen

This document establishes definitions and evaluation methods for wheel-rail contact geometry parameters influencing the vehicle running dynamic behaviour: - the rolling radius difference between the two wheels of a wheelset (Δr-function) which serves as a basis for all further calculations; - the equivalent conicity function from which are derived: • a single equivalent conicity value for a specified amplitude which is relevant for the assessment of vehicle running stability on straight track and in very large radius curves; • the nonlinearity parameter which characterizes the shape of this function and is related to the vehicle behaviour particularly in the speed range close to the running stability limit; - the rolling radii coefficient which is used to describe the theoretical radial steering capability of a wheelset in a curved track. Additional information is given about the relationship between the contact angles of the two wheels of a wheelset (Δtanγ-function) and about the roll angle parameter. Descriptions of possible calculation methods are included in this document. Test case calculations are provided to achieve comparable results and to check the proper implementation of the described algorithms. To validate alternative methods not described in this document acceptance criteria are given for the equivalent conicity function. This includes reference profiles, profile combinations, tolerances and reference results with tolerance limits. This document also includes minimum requirements for the measurement of wheel and rail profiles as well as of the parameters needed for the transformation into a common coordinate system of right- and left-hand profiles. This document does not define limits for the wheel-rail contact geometry parameters and gives no tolerances for the rail profile and the wheel profile to achieve acceptable results. For the application of this document some general recommendations are given.

This International Standard defines the procedures for noise control of mainly open plants.

It is applicable to the following:

_ specification of procedures for noise control during engineering of a new plant and modification/extension of

existing plants (construction noise procedures are outside the scope of this International Standard but should

be considered);

_ definition of responsibilities of parties involved, viz. "end-user", "engineering contractor" and "equipment

supplier";

_ description of general procedures to arrive at noise requirements for individual equipment, on the basis of

overall noise requirements for the plant.

A schematic flowchart, reviewing the noise control process, is presented in annex A and a summary of action items

is presented in annex B.

NOTE Concerning specific engineering methods for the acoustic design and analysis of plants, use should be made of

other standards and textbooks.