Mechanical Engineering Journal最新文献_第8页

An ultrasonic cleaner for cleaning the tip of a sampling nozzle by reversed phase driving of two vibrating plates (Translated) 一种通过反相驱动两个振动板来清洗取样喷嘴尖端的超声波清洗机(翻译)

Mechanical Engineering Journal Pub Date : 2023-01-01 DOI: 10.1299/mej.23-00349

Yosuke HORIE, Katsuhiko KIMURA, Akihiro NOJIMA, Hiroyuki TAKAYAMA, Kohei NONAKA

{"title":"An ultrasonic cleaner for cleaning the tip of a sampling nozzle by reversed phase driving of two vibrating plates (Translated)","authors":"Yosuke HORIE, Katsuhiko KIMURA, Akihiro NOJIMA, Hiroyuki TAKAYAMA, Kohei NONAKA","doi":"10.1299/mej.23-00349","DOIUrl":"https://doi.org/10.1299/mej.23-00349","url":null,"abstract":"As a method for cleaning the nozzle of clinical analyzers with high cleaning efficiency, ultrasonic cleaning was selected because the cleaning mechanism can be miniaturized and its effect on dispensing accuracy is negligible. As for nozzle cleaning, it is necessary to meet two requirements: (i) suppress the wetting range of the nozzle inserted in the chamber of the ultrasonic cleaner and (ii) generate cavitation at a depth of a few millimeters from the liquid surface. To meet those requirements, a new ultrasonic cleaner with an L-shaped cleaning head for high-efficiency cleaning of the nozzle is proposed. The cleaning head is composed of two vibration plates at its tip to concentrate the sound pressure in the cleaning area, and the shape of the head enables the vibration phase of the ultrasonic-irradiation surfaces of the plates to be reversed with a single bolt-clamped Langevin-type ultrasonic transducer (BLT). The BLT with the proposed cleaning head has three resonant frequencies: that of the BLT, fBLT, that of the lower plate, fL-P, and that of the upper plate, fU-P. At fBLT, the BLT expands and contracts in the longitudinal direction. At fL-P and fU-P, deformation of each vibration plate is large. By setting the resonance frequencies in increasing order of magnitude, i.e., fL-P, fBLT, and fU-P, it is possible to reverse the phases of the two vibration plates by driving the BLT at fBLT. It was experimentally confirmed that the sound pressure can be concentrated in the cleaning area of the cleaning head by driving the BLT at fBLT.","PeriodicalId":45233,"journal":{"name":"Mechanical Engineering Journal","volume":"115 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134982439","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Substructure elimination method for evaluating bending vibration of beams 评估梁弯曲振动的子结构消去法

Mechanical Engineering Journal Pub Date : 2023-01-01 DOI: 10.1299/mej.23-00293

Keisuke YAMADA, Jinchen JI

{"title":"Substructure elimination method for evaluating bending vibration of beams","authors":"Keisuke YAMADA, Jinchen JI","doi":"10.1299/mej.23-00293","DOIUrl":"https://doi.org/10.1299/mej.23-00293","url":null,"abstract":"In this study, a vibration analysis method is presented based on the substructure elimination method for a Bernoulli-Euler beam. Vibration analysis using modal analysis is effective for reducing the degrees of freedom and enables the analysis of a beam on which actuators and sensors are installed. When mechanical impedances are installed at the boundaries or the beam is coupled to other structures, a free-free beam is employed for conventional modal analysis using continuous functions. However, conventional modal analysis provides inaccurate simulation results when the coupled mechanical impedances considering the characteristic impedances of the beam are large. To address this issue, the modal analysis of a beam using the substructure elimination method was proposed in this study. Because the substructure elimination method for beams was only briefly reported on by the first author, several problems currently exist. To solve these problems, a substructure elimination method is proposed using a simply supported beam in addition to a guided-guided beam. Additionally, a new formulation method based on constraint conditions was proposed as a versatile method for setting arbitrary boundary conditions. The appropriate length, line density, and bending stiffness of the elimination regions, and the highest order of the eigenmode, were determined through simulations. The effectiveness of the proposed method was then verified by comparing the simulation results of the proposed method and exact solutions obtained using the boundary conditions. Based on a comparison with the simulation results of conventional modal analysis using a free-free beam, the precision of the proposed method is significantly higher than that of conventional modal analysis.","PeriodicalId":45233,"journal":{"name":"Mechanical Engineering Journal","volume":"84 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136367489","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Roller path solver system for multi-objective task-priority control of multipass conventional spinning 多道次常规纺丝多目标任务优先控制的罗拉路径求解系统

IF 0.5

Mechanical Engineering Journal Pub Date : 2023-01-01 DOI: 10.1299/mej.22-00253

S. Gondo, H. Arai

引用次数: 0

A particle-based method using the mesh-constrained discrete point approach for two-dimensional Stokes flows 基于粒子的二维Stokes流网格约束离散点方法

IF 0.5

Mechanical Engineering Journal Pub Date : 2022-05-16 DOI: 10.1299/mej.22-00204

Takeharu Matsuda, Kohsuke Tsukui, Satoshi Ii

{"title":"A particle-based method using the mesh-constrained discrete point approach for two-dimensional Stokes flows","authors":"Takeharu Matsuda, Kohsuke Tsukui, Satoshi Ii","doi":"10.1299/mej.22-00204","DOIUrl":"https://doi.org/10.1299/mej.22-00204","url":null,"abstract":"Meshless methods inherently do not require mesh topologies and are practically used for solving continuum equations. However, these methods generally tend to have a higher computational load than conventional mesh-based methods because calculation stencils for spatial discretization become large. In this study, a novel approach for the use of compact stencils in meshless methods is proposed, called the mesh-constrained discrete point (MCD) approach. The MCD approach introduces a Cartesian mesh system to the background of a domain. And the approach rigorously constrains the distribution of discrete points (DPs) in each mesh by solving a dynamic problem with nonlinear constraints. This can avoid the heterogeneity of the DP distribution at the mesh-size level and impose compact stencils with a fixed degree of freedom for derivative evaluations. A fundamental formulation for arrangements of DPs and an application to unsteady Stokes flows are presented in this paper. Numerical tests were performed for the distribution of DPs and flow problems in co-axial and eccentric circular channels. The proposed MCD approach achieved a reasonable distribution of DPs independently of the spatial resolution with a few iterations in pre-processing. Additionally, solutions using the obtained DP distributions in Stokes flow problems were in good agreement with theoretical and reference solutions. The results also confirmed that the numerical accuracies of velocity and pressure achieved the expected convergence order, even when compact stencils were used.","PeriodicalId":45233,"journal":{"name":"Mechanical Engineering Journal","volume":"1 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44063508","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Relationship between the reciprocity of transfer functions for mechanical vibration systems and optimal design formulas of dynamic vibration absorbers 机械振动系统传递函数的互易性与动力减振器优化设计公式的关系

IF 0.5

Mechanical Engineering Journal Pub Date : 2022-03-31 DOI: 10.1299/mej.21-00362

T. Asami

引用次数: 0

Pressure drop evaluation based on two-phase flow observation in packed bed system 基于两相流观测的填料床系统压降评价

IF 0.5

Mechanical Engineering Journal Pub Date : 2022-01-01 DOI: 10.1299/mej.21-00437

Noriaki Yasugi, Naoya Odaira, D. Ito, K. Ito, Yasushi Saito

引用次数: 0

Vibration analysis of liquid in an axisymmetric tank covered by a diaphragm 用隔膜覆盖的轴对称罐内液体的振动分析

IF 0.5

Mechanical Engineering Journal Pub Date : 2022-01-01 DOI: 10.1299/mej.22-00022

M. Utsumi

引用次数: 0

Hysteresis in microbubble emission boiling (MEB) under highly subcooled conditions 高度过冷条件下微泡发射沸腾(MEB)的滞后现象

IF 0.5

Mechanical Engineering Journal Pub Date : 2022-01-01 DOI: 10.1299/mej.22-00062

Hotaka Kobayashi, Mirei Hayashi, Kizuku Kurose, I. Ueno

引用次数: 0

Analysis of effective measures for power fluctuation mitigation of geographically distributed wind and solar power 地理分布的风能和太阳能电力波动缓解的有效措施分析

IF 0.5

Mechanical Engineering Journal Pub Date : 2022-01-01 DOI: 10.1299/mej.21-00154

Biness Lukwesa, Naoya Takahashi, Kengo Suzuki, Yutaka Tabe, T. Chikahisa

引用次数: 0

Occurrence of plastic collapse under ratcheting due to gravity and seismic loading 重力和地震荷载作用下棘轮塑性破坏的发生

IF 0.5

Mechanical Engineering Journal Pub Date : 2022-01-01 DOI: 10.1299/mej.21-00321

Satoru Kai, M. Ichimiya, N. Kasahara

{"title":"Occurrence of plastic collapse under ratcheting due to gravity and seismic loading","authors":"Satoru Kai, M. Ichimiya, N. Kasahara","doi":"10.1299/mej.21-00321","DOIUrl":"https://doi.org/10.1299/mej.21-00321","url":null,"abstract":"The most dominant failure mode of piping components under seismic loading is fatigue failure with ratcheting. While it was confirmed via the experimental tests in the past, the Primary stress limit is applied to seismic loading to prevent plastic collapse. The plastic collapse due to seismic loading was first confirmed at Pipe-Fitting Dynamic Reliability Program (PFDRP) conducted by EPRI in 1980s. But, the mechanism and occurrence condition of this failure has not been clarified yet. In this research, a composite failure mode of the ratchet-induced collapse, which represents the behavior of the plastic collapse failure induced by ratchet deformation, is introduced. The transition of the failure modes along ratcheting is explained with the seismic failure mode map which identifies the occurrence condition of ratcheting and first-excursion failure, and the X-Y trajectory, which explains the excitation condition of structures under ratcheting, is introduced to project the transition. With the X-Y trajectory and the occurrence condition of the plastic collapse, this study conceptually proposes the prediction approach of the ratchet-induced collapse without the simulation analyses.","PeriodicalId":45233,"journal":{"name":"Mechanical Engineering Journal","volume":"1 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66397439","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0