Tomokazu Nakagawa

Title: Tomokazu Nakagawa: Innovator in Residual Stress Estimation

Introduction

Tomokazu Nakagawa is a prominent inventor based in Kobe, Japan. He has made significant contributions to the field of engineering, particularly in the area of residual stress estimation. With a total of 9 patents to his name, Nakagawa's work has had a substantial impact on structural analysis and design.

Latest Patents

Among his latest patents is a method and device for estimating residual stress. This innovative approach allows for the estimation of residual stress suitable for structures where inherent strain, primarily due to plastic strain, occurs. The method introduces a constraint condition to the distribution function used in residual stress estimation, ensuring that a plastic-worked structure does not undergo volume change before and after working. By measuring residual stress or elastic strain from a T piece collected from the structure, Nakagawa optimizes the parameters of the distribution function to approximate the inherent strain at each measurement point. This results in a calculated estimated value of the residual stress in the structure.

Another notable patent involves the design of an upper body for a mobile crane. This design features a bearing seat surface fixed by a bearing bolt to the upper surface of a swing bearing. The swing frame includes an intersecting side plate that is also fixed to the bearing seat surface, along with a force dispersing member that includes vertical plates extending in the up-down direction. This innovative design enhances the structural integrity and performance of mobile cranes.

Career Highlights

Throughout his career, Nakagawa has worked with reputable companies such as Kobe Steel, Ltd. and Kobelco Construction Machinery Co., Ltd. His experience in these organizations has allowed him to apply his innovative ideas in practical settings, contributing to advancements in engineering and construction machinery.

Collaborations

Nakagawa has collaborated with notable colleagues, including Masao Kinefuchi and Keisuke Okita. These partnerships have fostered a creative environment that has led to the development of groundbreaking technologies in their respective fields.

Conclusion

Tomokazu Nakagawa's contributions to the field of engineering, particularly in residual stress estimation, highlight his innovative spirit and dedication to advancing technology. His patents and collaborations reflect a commitment to improving structural analysis and design, making him a significant figure in his industry.