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CFD Simulation of Pulsation Noise in a Small Centrifugal Compressor with Volute and Resonance Tube

Journal of Thermal Science 2015年第1期24卷 24-29页

作者： daich.Wakaki Yuta Sakuka Yuzo Inokuchi Kosuke Ueda Nobuhiko Yamasaki Akihiro Yamagata Kyushu University IHI Corporation

The rotational frequency tone noise emitted from the automobile turbocharger is called the pulsation noise. The cause of the pulsation noise is not fully understood, but is considered to be due to some manufacturing errors, which is called the mistuning. The effects of the mistuning of the impeller blade on the noise field inside the flow passage of the compressor are numerically investigated. Here, the flow passage includes the volute and duct located downstream of the compressor impeller. Our numerical approach is found to successfully capture the wavelength of the pulsation noise at given rotational speeds by the comparison with the experiments. One of the significant findings is that the noise field of the pulsation noise in the duct is highly one-dimensional although the flow fields are highly three-dimensional.

关键词：离心压缩机噪声场 CFD模拟脉动蜗壳谐振管叶轮叶片涡轮增压器

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Woofer–tweeter adaptive optical structured illumination microscopy

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Photonics Research 2017年第4期5卷 329-334页

作者： QINGGELE LI MARC REINIG daich. KAMIYAMA BO HUANG XIAODONG TAO ALEX BARDALES JOEL KUBBY W.M.Keck Center for Adaptive Optical Microscopy Baskin Engineering University of California Department of Pharmaceutical Chemistry University of California Department of Cellular Biology University of Georgia

A woofer–tweeter adaptive optical structured illumination microscope(AOSIM) is presented. By combining a low-spatial-frequency large-stroke deformable mirror(woofer) with a high-spatial-frequency low-stroke deformable mirror(tweeter), we are able to remove both large-amplitude and high-order aberrations. In addition, using the structured illumination method, as compared to widefield microscopy, the AOSIM can accomplish highresolution imaging and possesses better sectioning capability. The AOSIM was tested by correcting a large aberration from a trial lens in the conjugate plane of the microscope objective aperture. The experimental results show that the AOSIM has a point spread function with an FWHM that is 140 nm wide(using a water immersion objective lens with NA=1.1) after correcting a large aberration(5.9 μm peak-to-valley wavefront error with 2.05 μm RMS aberration). After structured light illumination is applied, the results show that we are able to resolve two beads that are separated by 145 nm, 1.62× below the diffraction limit of 235 nm. Furthermore, we demonstrate the application of the AOSIM in the field of bioimaging. The sample under investigation was a green-fluorescentprotein-labeled Drosophila embryo. The aberrations from the refractive index mismatch between the microscope objective, the immersion fluid, the cover slip, and the sample itself are well corrected. Using AOSIM we were able to increase the SNR for our Drosophila embryo sample by 5×.

关键词： AO SIM Woofer tweeter adaptive optical structured illumination microscopy

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Cleveland治疗肾上腺Cushing综合征的临床经验

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中华泌尿外科杂志 1998年第6期19卷 23-23页

作者： daich.JA 李宁忱（摘译）袁之敏（校）

Ｃｌｅｖｅｌａｎｄ治疗肾上腺Ｃｕｓｈｉｎｇ综合征的临床经验［ＤａｉｃｈＪＡ，ｅｔｌ．ＪＵｒｏｌ，１９９７，１５８∶２０５１］为了更好地了解肾上腺腺瘤或皮质腺癌引起的Ｃｕｓｈｉｎｇ综合征的临床表现、生化改变、治疗效果以... 详细信息

Ｃｌｅｖｅｌａｎｄ治疗肾上腺Ｃｕｓｈｉｎｇ综合征的临床经验［ＤａｉｃｈＪＡ，ｅｔｌ．ＪＵｒｏｌ，１９９７，１５８∶２０５１］为了更好地了解肾上腺腺瘤或皮质腺癌引起的Ｃｕｓｈｉｎｇ综合征的临床表现、生化改变、治疗效果以及患者的生存率，作者对１９７１年８...

关键词：肾上腺内分泌腺临床经验综合征综合病症 Cleveland Cushing

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