#Japan #Nagoya #NewtonWorks #NV Analysis #Hirotaka Ido

Seminar Insights on Sound and Vibration Analysis

On June 5, 2026, Newton Works Co., headquartered in Chuo-ku, Tokyo, hosted an essential seminar in Nagoya aimed at design and CAE engineers grappling with acoustic and vibrational challenges. The theme revolved around the practical application of NV (Noise and Vibration) analysis, accompanied by a keynote presentation from Hirotaka Ido, a prominent figure with past affiliations to Toyota Central R&D Labs and Sony, currently a collaborative researcher at Chuo University.

Keynote Address: Identifying Causes through Evaluation Criteria

Ido's keynote focused primarily on the critical aspects of identifying the causes of noise and vibration issues. He clarified the significance of separating 'input' from 'transmission characteristics' of systems in order to address noise problems effectively. Observed sound pressure in actual products results from a complex interaction of these variables, and he pointed out that relying solely on basic measurement values often fails to uncover essential causes.

To enhance understanding, Ido introduced several evaluation metrics that designers can utilize to assess these transmission characteristics. The following key indicators were highlighted:

• - Acoustic intensity and power
• - Acoustic radiation efficiency
• - Contribution level from vibrations to sound

Ido demonstrated various phenomena, such as how vibrational patterns on structural surfaces could lead to noise that cancels itself out due to complex phase distributions. His approach emphasized evaluating not only the magnitude of vibrations but also the phase and radiation efficiency, recommending rigorous methodologies to enhance analytical accuracy.

He discussed ensuring the reliability of experimental data by focusing on techniques for noise reduction during measurements, such as Cross-Spectrum methods, various window functions, and overlap processing techniques. Ido also introduced Hilbert transform for evaluating measurement data to verify system nonlinearity, empowering engineers with the tools necessary for managing signal processing correctly in conjunction with experimental validations.

Does Structural Optimization Truly Aid NV Solutions?

Moving towards structural optimization in the context of noise and vibration, the CAE Center at Newton Works, represented by Ikari Moto, presented insights into whether structural optimization significantly contributes to NV mitigation. Though theoretically, non-parametric shape optimization is known for its potential to effectively reduce NV issues, questions arose regarding real-world application. How effective are the outcomes of optimization in practical scenarios? Is manufacturing an optimized yet complex structure feasible?

Such concerns prompted CAE engineers to seek validation through product trials rather than relying solely on simulated results. The team undertook this challenge using the OPTISHAPE-TS software developed by Kuitinto to implement non-parametric shape optimization. Initial experiments with a foundational shape manufactured through metallic 3D printing confirmed the validity of their analytical results. Subsequent testing involved evaluating the optimized shape produced by the same method, comparing the real-world performance of both the basic and optimized versions.

Comprehensive NV Optimization for Systems

During the seminar, Sasaki from the CAE Center elaborated on the NV analysis techniques intended for rotating machinery systems. Utilizing the MESYS software from MESYS AG in Switzerland, Sasaki demonstrated an integrated model comprising bearings, shafts, gears, and cases. This model accounts for the interrelations among various elements, aimed at vibration and noise reduction through design improvements, including:

• - Optimization of tooth surface shapes
• - Optimization of case profiles

Conclusion

In summary, the seminar showcased a structured process emphasizing:

• - Cause identification through evaluation metrics
• - Ensuring correlation between experimentation and analysis
• - Optimizing the entire system

Ido's insightful presentation significantly contributed to the collective understanding of separating input and transmission characteristics in tackling sound and vibration issues, providing guidance for practical applications in design.

For those interested, Newton Works regularly hosts various seminars related to NV analysis. Information on these seminars can be found on our website.

Meet Hirotaka Ido

Hirotaka Ido is a seasoned specialist in the forefront of vibration, noise analysis, and acoustic numerical simulation (BEM/FEM). His extensive career includes significant roles at Toyota Central R&D Labs and Sony, aiding in the development of iconic products like AIBO and VAIO. Currently involved with the Japan Modal Analysis Council and Chuo University, he's also a part-time director at Kuitinto. His profound theoretical knowledge and practical experience in manufacturing underscore his expertise in the field.

About MESYS

MESYS AG, based in Switzerland, developed the MESYS software, which specializes in design and engineering calculations for mechanical components — particularly bearings, shafts, and gears. It is widely recognized among engineers working on rotary machinery in automotive, machine tools, wind energy, robotics, and general industrial applications worldwide.

About OPTISHAPE-TS

This software from Kuitinto, known for its world-class technology, offers structural optimization solutions. It utilizes various methods, including topology optimization and non-parametric shape optimization, to derive ideal structural forms mathematically for maximizing rigidity, controlling natural frequencies, and achieving lightweight designs.

About Newton Works Co.

Newton Works is an independent engineering solution provider specializing in CAE (Computer Aided Engineering) for mechanical systems. It offers wide-ranging solutions that encompass detailed FEM analysis and broader 1D simulation models, addressing the complex challenges faced by Japan's manufacturing sectors.