Nihon kikai gakkai ronbunshu最新文献_第2页

Shape optimization of viscous flow domain considering unsteady fluid structure interaction 考虑非定常流固耦合的粘性流域形状优化

Nihon kikai gakkai ronbunshu Pub Date : 2023-01-01 DOI: 10.1299/transjsme.23-00219

Eiji KATAMINE, Seiya SHIMAKAWA

{"title":"Shape optimization of viscous flow domain considering unsteady fluid structure interaction","authors":"Eiji KATAMINE, Seiya SHIMAKAWA","doi":"10.1299/transjsme.23-00219","DOIUrl":"https://doi.org/10.1299/transjsme.23-00219","url":null,"abstract":"This paper presents numerical solution to shape design problems of viscous flow field for unsteady fluid-structure-interactive (FSI) fields. In the FSI analysis, a strong coupled analysis is used to analyze the governing equation of the flow domain and the structural domain considering nonlinearity of strain. A minimization problem for total dissipation energy is formulated for the shape optimization of viscous flow domain in the FSI fields. Also, a shape design problem is formulated to control the flow velocity distribution in the sub-domains of the flow domain. This latter problem can be treated as an inverse problem for minimizing the square error integration between the actual flow velocity distribution and the target flow velocity distribution in the sub-domains. Shape gradient of these shape design problems are derived theoretically using the Lagrange multiplier method, adjoint variable method, and the formulae of the material derivative. Reshaping is carried out by the H1 gradient method proposed as an approach to solving shape optimization problems. Numerical analysis programs for these shape optimization problems are developed by using FreeFEM, and the validity of proposed method is confirmed by results of 2D numerical analyses.","PeriodicalId":485601,"journal":{"name":"Nihon kikai gakkai ronbunshu","volume":"91 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":"135159908","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

Study on fatigue strength in terms of stresses measured by strain gauges attached with its ends to be at weld toes 焊接接头端部应变片测量疲劳强度的应力研究

Nihon kikai gakkai ronbunshu Pub Date : 2023-01-01 DOI: 10.1299/transjsme.23-00184

Koichi YOKOZEKI, Taizo MAKINO, Tomonori TOMINAGA, Takanori KATO, Satoshi KIKKO, Yoshiyuki SHIMOKAWA

引用次数: 0

Research on hydraulic actuators that utilize the compressibility of air bubbles in hydraulic fluid as a shock absorbing effect 利用液压油中气泡的可压缩性作为减震作用的液压执行器的研究

Nihon kikai gakkai ronbunshu Pub Date : 2023-01-01 DOI: 10.1299/transjsme.23-00114

Yuki KITAZAWA, Sayako SAKAMA, Yoshiki SUGAWARA

引用次数: 0

長方形ツイン噴流の流れ特性に及ぼすノズルの配向及び間隔の影響喷嘴的定向和间隔对长方形双喷流的流动特性的影响

Nihon kikai gakkai ronbunshu Pub Date : 2023-01-01 DOI: 10.1299/transjsme.23-00193

Koichi HAYASHIDA, Takahiro KIWATA

{"title":"長方形ツイン噴流の流れ特性に及ぼすノズルの配向及び間隔の影響","authors":"Koichi HAYASHIDA, Takahiro KIWATA","doi":"10.1299/transjsme.23-00193","DOIUrl":"https://doi.org/10.1299/transjsme.23-00193","url":null,"abstract":"The effect of the nozzle orientation and the nozzle spacing on the flow characteristics of twin rectangular jets were studied experimentally. The nozzle spacing ratio S/de of a rectangular nozzle with an aspect ratio of 2 was varied from 2.75 to 6.875. Two nozzle orientations were tested, i.e., twin nozzles oriented along the minor plane (TwinMinor) and twin nozzles oriented along the major plane (TwinMajor), and the results were compared with a single round jet, a single rectangular jet, and a twin round jet. In each case, the Reynolds number based on the maximum jet velocity and the equivalent diameter was 1.5 × 104. The nozzle orientation has no influence on the flow characteristics of twin rectangular jets along the jet centerline. However, the velocity and turbulence intensity of the twin rectangular jets of TwinMajor increases more than that of TwinMinor near the symmetry line of the twin jets, and the location of the combined point (CP) becomes upstream. The twin rectangular jets with a small nozzle spacing ratio, i.e., S/de = 2.75 merge upstream. The velocity near the jet centerline in downstream becomes relatively higher compared to that with a large spacing ratio. The vortex shedding frequency of the twin rectangular jets depends on the nozzle spacing ratio. The flow characteristics of the twin rectangular jets with a large nozzle spacing ratio, i.e., S/de = 5.5 and 6.875 are similar to the single rectangular jet.","PeriodicalId":485601,"journal":{"name":"Nihon kikai gakkai ronbunshu","volume":"27 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":"135612111","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

延性損傷モデルを用いた予ひずみ材の延性き裂進展抵抗の予測手法の提案使用延性损伤模型预测预应变材料的延性断裂进展阻力的方法的提案

Nihon kikai gakkai ronbunshu Pub Date : 2023-01-01 DOI: 10.1299/transjsme.23-00168

Mitsuru OHATA, Hiroto SHOJI, Kazuma SHIMIZU, Hiroyasu TANIGAWA, Taichiro KATO, Takashi NOZAWA

{"title":"延性損傷モデルを用いた予ひずみ材の延性き裂進展抵抗の予測手法の提案","authors":"Mitsuru OHATA, Hiroto SHOJI, Kazuma SHIMIZU, Hiroyasu TANIGAWA, Taichiro KATO, Takashi NOZAWA","doi":"10.1299/transjsme.23-00168","DOIUrl":"https://doi.org/10.1299/transjsme.23-00168","url":null,"abstract":"This study aims to develop a numerical simulation-based method for predicting ductile crack growth resistance curve (R-curve) for pre-strained components for rational assessment of ductile crack growth controlling fracture for pre-strained structural component with any plastic constraint. Experiments on R-curve of 3-point bend specimen with a shallow crack for steel pre-strained by 6% over uniform elongation provides that the pre-strain does not significantly reduce ductile crack initiation and growth resistance, even though the pre-strain induces disappearance of uniform elongation and work hardening together with drastic reduction in elongation. Observations of damage evolution in terms of micro-void formation indicate that ductile crack growth behaviors in both virgin and pre-strained steels are based on a micro-void nucleation-controlled ductile fracture mechanism. These experimental results demonstrate that the ductile damage model that we have already proposed for predicting R-curve for virgin steel that exhibits micro-void nucleation-controlled ductile fracture behaviors can be applicable for these virgin and pre-strained steels used. Thus, based on the previously proposed ductile damage model, a simulation-based method to predict the R-curve of pre-strained specimens only from the properties of virgin steel is proposed taking material degradation (change in strength and damage properties) due to pre-strain into account. The applicability of the proposed method is verified by showing the predicted R-curve for pre-strained steel are in good agreement with experimental results.","PeriodicalId":485601,"journal":{"name":"Nihon kikai gakkai ronbunshu","volume":"9 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":"135753619","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

圧電素子内蔵軸ばね防振ゴムを用いた走行中の台車の状態監視手法采用内置压电元件轴弹簧防震橡胶的行驶中的转向架状态监视手法

Nihon kikai gakkai ronbunshu Pub Date : 2023-01-01 DOI: 10.1299/transjsme.23-00112

Shogo MAMADA, Tatsuya OHTA, Shinichi SAGA, Kazuhiro YOSHIKAWA

{"title":"圧電素子内蔵軸ばね防振ゴムを用いた走行中の台車の状態監視手法","authors":"Shogo MAMADA, Tatsuya OHTA, Shinichi SAGA, Kazuhiro YOSHIKAWA","doi":"10.1299/transjsme.23-00112","DOIUrl":"https://doi.org/10.1299/transjsme.23-00112","url":null,"abstract":"The axle spring vibration isolator rubber installed on the axle box that encloses the axle bearings is subjected to loads corresponding to the wheel weight and vibration of the axle box during running. It is thought that the running condition of the bogie can be monitored by utilizing the axle spring vibration isolator rubber as a sensor to grasp the load and vibration. Therefore, we investigated a method of monitoring the running condition of the bogie by incorporating a piezoelectric element, which generates electric signals in response to applied loads and vibrations, in the axle spring vibration isolator rubber. In this paper, we made the rubber isolator with a built-in piezoelectric element (RIBP). As a result of running tests with the RIBP installed on a bogie, we found that the running condition of the bogie can be monitored by the time waveform of the electrical signal obtained from the piezoelectric element, and that the condition of the axle bearing can be monitored by the result of frequency analysis. In addition, as a result of examining the actual method of monitoring the running condition of a bogie using a RIBP, it was found that the condition could be monitored even if the number of RIBP installed on the bogie was reduced.","PeriodicalId":485601,"journal":{"name":"Nihon kikai gakkai ronbunshu","volume":"87 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":"135104540","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

面内圧縮力を受ける連結ジグザグ構造の機械的特性評価承受面内压缩力的连接z字形结构的机械特性评价

Nihon kikai gakkai ronbunshu Pub Date : 2023-01-01 DOI: 10.1299/transjsme.23-00216

Keiichiro YOKOYAMA, Kuniharu USHIJIMA, Takuma SUZUKI, Kensuke SASAKI, Toshihiko OKANO, Yuta WASHIMI

引用次数: 0

Motion planning for intersection turning of heavy-duty autonomous vehicles using vehicle body trajectory prediction and risk potential evaluation 基于车身轨迹预测和风险潜力评估的重型自动驾驶汽车交叉口转弯运动规划

Nihon kikai gakkai ronbunshu Pub Date : 2023-01-01 DOI: 10.1299/transjsme.23-00139

Yutaka HAMAGUCHI, Yo SANOGAWA, Pongsathorn RAKSINCHAROENSAK

引用次数: 0

噴霧全領域を対象とした高解像度画像の取得と被写体深度校正による燃料噴霧液滴の解析通过获取针对整个喷雾区域的高分辨率图像和对象深度校正分析燃料喷雾液滴

Nihon kikai gakkai ronbunshu Pub Date : 2023-01-01 DOI: 10.1299/transjsme.23-00141

Dai MATSUDA, Kentaro INASAKI, Shunsuke ISSHIKI, Eriko MATSUMURA, Jiro SENDA

{"title":"噴霧全領域を対象とした高解像度画像の取得と被写体深度校正による燃料噴霧液滴の解析","authors":"Dai MATSUDA, Kentaro INASAKI, Shunsuke ISSHIKI, Eriko MATSUMURA, Jiro SENDA","doi":"10.1299/transjsme.23-00141","DOIUrl":"https://doi.org/10.1299/transjsme.23-00141","url":null,"abstract":"The atomization process of fuel spray injection in internal combustion engines affects the spray mixture formation process, the combustion characteristics, and the formation of toxic substances. Therefore, several optical measurement procedures have been developed and applied to capture spray features, including imaging methods and laser diagnostics. It has been concluded that the spatial resolution of fine spray droplets detection in imaging with silver halide film is much better than with a CCD imaging device. Therefore, the authors previously developed a novel imaging technique called Super High Spatial Resolution Photography (SHSRP), which allows for whole spray imaging while maintaining the spatial resolution of tiny droplets. This is a wide-field, high-resolution imaging method that can measure the entire spray area at the droplet scale. However, the image analysis method analyzes the intensity gradient of the outer edge of the droplet, and the accuracy of droplet analysis deteriorates as the droplet diameter is small. In this study, a new image analysis method with wide-field and high-resolution images acquired by SHSRP was developed to improve the analysis accuracy of spray droplets. The analysis method of depth of object field, which depends on droplet size, was changed from one-dimensional analysis of the intensity gradient of the outer edge of the droplet to two-dimensional analysis using the intensity deviation of the entire droplet area. For the developed analysis method, analysis of error based on scattering theory was conducted and the droplet capture ratio in diesel spray was analyzed to verify the accuracy. As a result, it was found that the particle size distribution obtained has no peaks due to noise effects, and that the presented analysis method is accurate enough to characterize the particle size distribution of diesel spray.","PeriodicalId":485601,"journal":{"name":"Nihon kikai gakkai ronbunshu","volume":"20 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":"135507915","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

Proposition of an energy density topology change method for plural eigen frequencies control 复数本征频率控制中能量密度拓扑变化方法的提出

Nihon kikai gakkai ronbunshu Pub Date : 2023-01-01 DOI: 10.1299/transjsme.23-00142

Toshie SASAKI, Ichiro HAGIWARA

{"title":"Proposition of an energy density topology change method for plural eigen frequencies control","authors":"Toshie SASAKI, Ichiro HAGIWARA","doi":"10.1299/transjsme.23-00142","DOIUrl":"https://doi.org/10.1299/transjsme.23-00142","url":null,"abstract":"It has not been solved that the fruits and vegetables such as strawberries, cells, blood and a bottle of sake are damaged, broken during transportation. It is the greatest factor in this situation that there is a dangerous vibration frequency range where these are easy to scratch and are prone to death. If there are eigen frequencies within this dangerous frequency range，it is good to be redesigned such that the eigen frequencies within this dangerous frequency range are moved out of the range. But it is difficult to apply the existing topology optimization methods using homogenization method or density method or thickness distribution method. As fundamental research, it is demonstrated the effectiveness of the proposed method based on the strain and kinetic energy density distributions of the targeted eigen modes for a flat plate compared to the conventional topology optimization method using thickness distribution as follows. (1) It is possible to control plural eigen frequencies by deciding interactively how the topology should be changed from the observation of kinetic and strain energy density distributions of the targeted eigen modes in a very short time compared to the conventional topology optimization method. (2) In the case of the proposed method, it is not necessary to get a new topology from the thickness or density distribution after the optimization results. (3) It can be checked the validity of the task set for the conventional topology optimization method by observing the strain and kinetic energy density distributions of the targeted eigen modes which are actively used in the proposed method.","PeriodicalId":485601,"journal":{"name":"Nihon kikai gakkai ronbunshu","volume":"4 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":"135611521","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