Calibration of railway shock absorbers: why it is important for stability and comfort

The railway shock absorber calibration it is an important phase in the development of the component. In fact, it contributes to defining the shock absorber's response to the movements and stresses expected during exercise.

A railway shock absorber must not only be durable and compatible with the suspension system. It must also offer a response consistent with the characteristics of the application for which it was designed.

For this reason, correct calibration contributes to the control of oscillations and vibrations. Furthermore, it affects vehicle stability and ride comfort.

So let's see how the calibration of railway shock absorbers works, which parameters are considered and why testing and validation play a fundamental role.viari.

Railway shock absorber calibration: what it means

Calibration defines how the shock absorber reacts to movement. In simple terms, it establishes how much resistance the component must offer during the different compression and extension phases.

The behavior of the shock absorber can vary based on numerous parameters:

• speed of movement;
• load size;
• direction of stress;
• frequency of cycles;
• operating temperature;
• mounting position;
• vehicle characteristics;
• type of suspension.

There is therefore no universal calibration valid for every train or every railway application. Each component must be developed in relation to the system in which it will be installed.

Calibration of railway shock absorbers and train stability

Stability is one of the main objectives of railway shock absorber calibration. While driving, the vehicle is subjected to vertical, lateral and longitudinal movements which must be controlled in a balanced manner.

Inadequate calibration can result in an excessively stiff or too compliant response. In the first case, the system could transmit the stresses to the structure and the vehicle more. In the second, the movements may not be controlled sufficiently.

Yaw dampers, also known as Yaw Damper, play a specific role in controlling the lateral movements and oscillations of the undercarriage. Their calibration must be defined considering the dynamic behavior of the vehicle, the operating speed and the expected operating conditions.

The influence on ride comfort

Calibration also directly affects ride comfort. Vibrations, shocks and oscillations can be felt by passengers and on-board staff, especially when the vehicle travels on irregular surfaces or faces changes in speed and direction.

A correctly calibrated shock absorber helps to make the suspension response more progressive, limiting unwanted movements and promoting a smoother ride.

Comfort, however, should not be considered separately from safety. The calibration must guarantee a balance between stress absorption, vehicle stability and maintenance of performance over time.

How calibration is defined

The definition of the calibration starts from the analysis of the technical requirements of the application. Engineers evaluate the vehicle type, suspension, loads, component location and operating conditions.

Subsequently, design, simulation and testing tools can be used to verify the response of the shock absorber. Dynamic tests allow you to analyze the behavior of the component at different speeds and with different stress levels.

Test results may lead to changes in parameters, internal components or product configuration. The process continues until the required performance is achieved.

Why tests are important

The calibration of railway shock absorbers must be verified through controlled tests. The tests allow the theoretical behavior to be compared with the real one and to identify any variations during the work cycles.

Checks may include:

• static tests;
• dynamic tests;
• duration cycles;
• functional checks;
• simulations of operating conditions;
• product validation.

An effective calibration must remain stable even after prolonged use and in the presence of variable environmental conditions.

A balance between performance and reliability

The calibration of railway shock absorbers is not a simple adjustment value, but the result of a technical process that involves design, simulation, testing and validation.

When defined correctly, it allows to improve the stability of the trainset, reduce vibrations and increase ride comfort, contributing to the reliable operation of the entire railway suspension system.

Way Assauto railway shock absorbers: design and skills

The railway shock absorber calibration It is part of a larger process involving application analysis, design, development and component verification.

Way Assauto operates in the sector of damping solutions also for railway applications. The experience gained in the design and production of shock absorbers allows us to address different technical needs depending on the application.

The path starts from the analysis of the requirements and continues through the different phases of development of the component.

Discover Way Assauto solutions for the railway sector and contact the team to delve deeper into the needs of your application.