Keizo Ohnishi

Title: Keizo Ohnishi: Innovator in Noise Reduction Technologies

Introduction

Keizo Ohnishi is a notable inventor based in Takasago, Japan. He has made significant contributions to the field of noise reduction technologies, holding a total of 6 patents. His innovative work focuses on developing advanced systems that effectively mitigate noise in various environments.

Latest Patents

Ohnishi's latest patents include an active sound reduction apparatus and an active noise insulation wall. The active noise insulation wall features an active sound reduction apparatus that is strategically placed on the upper end surface of a noise insulation wall. This apparatus combines an active acoustic control cell with a sound tube, allowing it to actively reduce the diffracted sound pressure component of incoming noise. Additionally, the sound tube is designed to decrease sound waves of frequencies that differ from the target frequency of the active acoustic control cell. This innovative design enables the active noise insulation wall to effectively reduce a wide range of noise frequencies.

Another significant patent involves an outer casing covering a gas turbine combustor. This combustor structure incorporates a sheet-like vibration damper that resonates with air vibrations in the intake chamber. The damper is attached to the inner wall of the casing and absorbs energy from air vibrations. It can be made from either a single-layered thin flat plate or multi-layered thin flat plates, allowing it to absorb and attenuate vibration energy across different frequencies. The design also facilitates air circulation between spaces on opposite sides of the damper, enhancing its vibrational response.

Career Highlights

Throughout his career, Keizo Ohnishi has worked with prominent companies such as Mitsubishi Heavy Industries Limited and Mitsubishi Jukogyo Kabushiki Kaisha. His experience in these organizations has contributed to his expertise in developing innovative solutions for noise reduction.

Collaborations

Ohnishi has collaborated with notable colleagues, including Masaharu Nishimura and Kazufumi Ikeda. Their combined efforts have further advanced the field of noise reduction technologies.

Conclusion

Keizo Ohnishi's contributions to noise reduction technologies through his patents and collaborations highlight his innovative spirit and dedication to improving acoustic environments. His work continues to influence advancements in this critical area of engineering.