Railway applications—Specification and demonstration of reliability,availability,maintainability and safety (RAMS)—Part 3:Guide to the application for rolling stock RAM
1 Scope
This part of GB/T 21562 provides guidance on applying the RAM requirements in GB/T 21562-2008 to rolling stock and for dealing with RAM activities during the system life cycle phases from invitation to tender to demonstration in operation only.
The guide is aimed at the customers/operators and main suppliers of rolling stock. The main purpose of the guide is to:
— enable a customer/operator of rolling stock:
● to specify the RAM requirements addressing the type of operation in terms of the end customer needs, considering service availability and economic considerations;
● to evaluate different tenders, in terms of RAM requirements, on a common basis with the aid of specific RAM documents;
● to gain assurance, during design/development phase, that the rolling stock being offered is likely to satisfy the RAM contractual requirements by examining step by step detailed and specific RAM documents as an output of the RAM activities performed during the development phase; and to validate that the rolling stock, as delivered, satisfies the specified RAM requirements;
— enable the main supplier of rolling stock:
● to understand the customers/operators RAM requirements;
● to provide substantive information/visibility in a tender to show that the product offered is likely to satisfy the RAM requirements by performing preliminary RAM analysis;
● to provide substantive information during design/development phase to show that the product offered is likely to satisfy the RAM requirements by performing detailed RAM analysis;
● to demonstrate that the product delivered satisfies the RAM requirements.
Regarding LCC, this part is restricted to providing only the key RAM parameters necessary to be incorporated into an LCC model.
This part excludes:
— RAM values connected to the different RAM requirements (however, it contains a simple guideline of actions for supporting the decision making process and choosing appropriate values, see 5.4);
— specific RAM documents to be produced and activities to be performed. However, it provides, only as an example, typical data and document templates for recording the output of a RAM analysis).
2 Terms and Definitions
For the purposes of this document, the following terms and definitions apply.
2.1
part number
the alphanumeric code, generally assigned by the main supplier, to represent a family of items with the same characteristics of form, fit and function
3 Approach Adopted for the Guide
3.1 General
The approach adopted is to raise the following questions, for each phase of the Life Cycle, in order to successively set up the requirements of GB/T 21562-2008 and the basis for satisfying them:
— WHAT: what activities / tasks are to be performed and the supporting documents to be produced?
— WHO: who has the responsibility for these activities / tasks?
— HOW: which type of method or tool should be used?
This process is adopted for the development of this part and should be applied in accordance with the structure of the application guide.
Foreword II
Introduction IV
1 Scope
2 Terms and Definitions
3 Approach Adopted for the Guide
3.1 General
3.2 Entities involved in the life cycle phases of rolling stock
4 Application
4.1 Object of the application
4.2 Application of GB/T 21562-
5 Specifying RAM Requirements
5.1 Introductory remarks
5.2 Preliminary RAM analysis
5.3 RAM requirements
5.4 Process for choosing RAM figures
5.5 RAM programme
6 RAM Assurance During Life Cycle
6.1 General
6.2 Tender phase
6.3 Design phase
6.4 Demonstration phase
7 RAM Parameters of LCC Model
7.1 General
7.2 Overview of LCC modelling
7.3 RAM parameters for LCC
Annex A (Informative) Examples of Breakdown Structure
Bibliography
