NTN Corporation Develops High-Accuracy CVJ Vibration Prediction Technology

NTN Corporation Develops Advanced CVJ Vibration Prediction Technology

NTN Corporation announced on August 31 that it has developed an analysis technology capable of accurately predicting, across an entire vehicle, how Constant Velocity Joints (CVJs) affect vibrations during driving. The technology enables engineers to assess CVJ performance after installation on a vehicle during the design stage, allowing products to be optimized for the characteristics of individual vehicles. By providing a way to evaluate these effects before physical prototypes or vehicle testing are conducted, the approach is designed to support a more efficient development process while maintaining a detailed understanding of vibration behavior throughout the vehicle.

Mechanism Analysis and Transfer Path Analysis Combined

The new approach combines CVJ analysis based on mechanism analysis with transfer path analysis (TPA), which examines how vibrations travel through different transmission routes toward the vehicle cabin. It reproduces the small axial forces generated by friction inside the CVJ, known as induced thrust, and evaluates how vibrations originating at the joint reach the cabin. The analysis considers transmission through components including the engine, electric drivetrain units such as e-Axles, suspension systems, and vehicle structural members or frames, while accounting for differences in the vibration transmission characteristics of each component.

Digital Prediction Targets Lower Development Effort

By predicting vehicle vibration behavior without requiring prototypes or physical vehicle tests, the technology is expected to reduce development person-hours by up to approximately 8% compared with conventional methods. NTN Corporation plans to expand its database of vibration characteristics covering different vehicle models, with the objective of establishing a development process that substantially reduces dependence on vehicle testing. The technology forms part of the company’s “Cyber Agile Engineering” initiative, which applies digital technologies to accelerate research and development and improve the efficiency of engineering activities.

Frequently Asked Questions

What does NTN Corporation’s new CVJ analysis technology do?
The technology predicts how Constant Velocity Joints affect vehicle-wide vibrations during driving without requiring physical prototypes or vehicle testing. It combines mechanism-based CVJ analysis with transfer path analysis to reproduce induced thrust and trace vibration transmission toward the cabin. The method accounts for transmission through the engine, e-Axles, suspension systems, and structural members while considering their different characteristics. NTN Corporation expects the approach to reduce development person-hours by up to approximately 8% compared with conventional methods and plans to expand its vibration-characteristics database for additional vehicle models.