IEC 61373:2010

Overview

IEC 61373:2010 is an international standard published by the International Electrotechnical Commission (IEC) that specifies testing requirements for rolling stock equipment in railway applications. It focuses on shock and vibration testing to ensure that electrical, electronic, and pneumatic equipment installed onboard railway vehicles can withstand the harsh operational environment. This standard is critical for manufacturers, test houses, and railway operators aiming to certify equipment durability and reliability throughout its expected service life.

Key Highlights

• Scope: Defines random vibration and shock test methods to simulate service conditions experienced by railway rolling stock equipment.
• Purpose: To validate that equipment can endure vibrations and shocks typical of railway operational environments, ensuring long-term functionality and safety.
• Updated Methodology: Includes revised calculation for acceleration ratio applied in simulation of long-life aging of equipment.
• Certification: Introduces the concept of partial certification under the standard.
• Practical Guidance: Provides methods to calculate functional RMS values based on service data or acceleration spectral density (ASD) levels.
• Comprehensive Testing: Covers functional random vibration tests, simulated long-life tests, shock pulse testing, and handling conditions.

---

Key Topics

1. Random Vibration Testing

IEC 61373 mandates the use of random vibration tests to mimic the operational vibrations experienced on railway vehicles. These vibrations affect various equipment mountings - body-mounted, bogie-mounted, and axle-mounted - each with specific ASD spectra and test severity levels.

2. Shock Testing

Equipment must be exposed to shock pulses with defined pulse shapes and velocity changes to evaluate its robustness against sudden mechanical impacts or jolts typical during railway operation and handling.

3. Test Conditions and Durations

• Functional Test Conditions: Equipment is tested under operational conditions to verify that shocks and vibrations do not impair functionality.
• Simulated Long-Life Testing: Accelerated vibration levels are applied to simulate extended fatigue, enabling a prediction of equipment lifespan under service vibration exposure.

4. Measuring and Mounting Guidelines

• Precise methods for mounting test samples and defining measuring points ensure reproducibility and consistency of test outcomes.
• Mechanical states during testing - fixed or functioning - are specified along with tolerance levels for measurement data.

5. Certification and Reporting

• Detailed acceptance criteria and reporting requirements standardize result evaluation and documentation.
• The addition of partial certification options allows tailored validation aligned to specific equipment or subsystem scopes.

---

Applications

IEC 61373:2010 is essential for:

• Rolling Stock Equipment Manufacturers: To design and validate robust electrical, electronic, and pneumatic equipment capable of handling railway-specific vibrations and shocks.
• Railway Operators and Maintenance Entities: To specify procurement requirements ensuring that installed equipment meets defined durability standards.
• Test Laboratories: Providing standardized procedures to perform vibration and shock testing, certify equipment, and issue compliant test certificates.
• Component Designers: To use service data effectively for designing equipment with proven resistance to mechanical stresses during operation.

This standard supports improved product reliability, safety, and reduced downtime in railway systems by ensuring equipment can withstand the dynamic environmental factors unique to rail transport.

---

Related Standards

• IEC 60571: Electronic equipment used on rolling stock – Provides requirements for electronic systems, often tested alongside IEC 61373.
• EN 50155: Railway applications – Rolling stock electronic equipment – Specifications concerning temperature, shock, and vibration, complementing IEC 61373 requirements.
• ISO 13355: Mechanical vibration – Vibration testing methodologies applicable to related transportation industries.

Using IEC 61373:2010 in conjunction with complementary standards ensures thorough equipment qualification for railway environments, optimizing operational resilience and interoperability.

---

Keywords: IEC 61373, railway applications, rolling stock equipment, shock and vibration tests, random vibration testing, simulated long-life testing, acceleration spectral density, shock pulse testing, railway equipment certification, railway environmental testing, rolling stock durability.