Applications in engineering science最新文献_第6页

A new viscoelastic model for human brain tissue using Lode invariants based rate-type thermodynamic framework 基于速率型热力学框架的Lode不变量的人脑组织粘弹性模型

Applications in engineering science Pub Date : 2023-09-01 DOI: 10.1016/j.apples.2023.100130

Durga Prasad, P. Sreejith, K. Kannan

{"title":"A new viscoelastic model for human brain tissue using Lode invariants based rate-type thermodynamic framework","authors":"Durga Prasad, P. Sreejith, K. Kannan","doi":"10.1016/j.apples.2023.100130","DOIUrl":"10.1016/j.apples.2023.100130","url":null,"abstract":"<div><p>We develop new rate-type constitutive relations on a set of orthonormal tensor basis and the corresponding set of Lode invariants, which require only 9 material parameters to predict the mechanical response of the human brain tissue. The mode-dependent response of the tissue is captured by invoking the Hill-stable elastic potential of Prasad and Kannan (2020) and constructing a new form for the rate of dissipation, thus introducing the mode-of-deformation dependent modulus terms and the mode-of-deformation-rate dependent viscosities into the rate-type thermodynamic framework of Rajagopal and Srinivasa (2000). Through the analysis-driven construction of the rate of dissipation, we incorporate maximum change in the viscosities with respect to the mode-of-deformation rates and limit the number of material parameters. Our model satisfactorily predicts the complicated load-unload cycles (pre-conditioned and conditioned) and the stress relaxation data under multiple modes of deformation and multiple rates for the Corona Radiata (CR) region of the brain tissue. It also captures the tension–compression asymmetry in the response and the higher relaxation time in compression loading than in shear loading.</p></div>","PeriodicalId":72251,"journal":{"name":"Applications in engineering science","volume":"15 ","pages":"Article 100130"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45597150","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

Simplified transformation matrices of journal bearings in vertical application 轴颈轴承在垂直应用中的简化变换矩阵

Applications in engineering science Pub Date : 2023-09-01 DOI: 10.1016/j.apples.2023.100147

Gudeta Berhanu Benti , Jan-Olov Aidanpää , Rolf Gustavsson

{"title":"Simplified transformation matrices of journal bearings in vertical application","authors":"Gudeta Berhanu Benti , Jan-Olov Aidanpää , Rolf Gustavsson","doi":"10.1016/j.apples.2023.100147","DOIUrl":"10.1016/j.apples.2023.100147","url":null,"abstract":"<div><p>Rotodynamic simulation of complex or/and large systems, for instance hydropower machines, may consist of models with many degrees of freedom and require multidisciplinary computations such as fluid-thermal-structure interactions or rotor-stator interactions due to electromagnetic forces. Simulating such systems is often computationally heavy and impractical, especially in the case of optimization or parametric study, where many iterations are required. This has, therefore, created a need for simplified dynamic models to improve computational efficiency without significantly affecting the accuracy of the simulation result. The purpose of this paper is to present simplified coordinate transformation matrices for journal bearings in vertical rotors, which require less computational effort. Matrix multiplications, which appear during coordinate transformation, were eliminated, and the bearing stiffness and damping matrices in the fixed reference frame were represented by local coefficients instead. The dynamic response of a vertical rotor with eight-shoe Tilting pad journal bearings was simulated using the proposed model for two operational conditions, i.e., when the rotor was spinning at constant and variable speeds. The results from the proposed model were compared to those from the original model and validated through experiments. The conclusion was that the presented simulation model is time efficient and can effectively be used in rotordynamic simulations and analyses.</p></div>","PeriodicalId":72251,"journal":{"name":"Applications in engineering science","volume":"15 ","pages":"Article 100147"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45204417","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

Damping control of polodes, inertia and natural frequencies: Theory and application to automotive suspensions 极、惯性和固有频率的阻尼控制:理论及其在汽车悬架中的应用

Applications in engineering science Pub Date : 2023-09-01 DOI: 10.1016/j.apples.2023.100143

Simone Mesbahi, Silvia Milana, Antonio Culla, Gianluca Pepe, Nicola Roveri, Antonio Carcaterra

引用次数: 0

Gradient elasticity solutions of 2D nano-beams 二维纳米梁的梯度弹性解

Applications in engineering science Pub Date : 2023-09-01 DOI: 10.1016/j.apples.2023.100140

Teoman Özer

引用次数: 0

Arctic naval launch and recovery operations, under ice impact interactions 冰撞击相互作用下的北极海军发射和回收行动

Applications in engineering science Pub Date : 2023-09-01 DOI: 10.1016/j.apples.2023.100146

Vladimir Yakimov , Oleg Gaidai , Fang Wang , Kelin Wang

{"title":"Arctic naval launch and recovery operations, under ice impact interactions","authors":"Vladimir Yakimov , Oleg Gaidai , Fang Wang , Kelin Wang","doi":"10.1016/j.apples.2023.100146","DOIUrl":"10.1016/j.apples.2023.100146","url":null,"abstract":"<div><p>This study analyses dynamic influence of stochastic vibro-impact ship behaviour on the ship's launch and recovery capability. To deliver cargo and people to the Arctic regions, ships must withstand harsh environmental conditions and interact with large floating ice pieces. This interaction may result in impact-type loading of a ship hull by ice, preventing planned navigation and even causing to abort of some routine launch and recovery operations of delivering cargo or other equipment. The major safety concern is the risk of collision between the payload and the mother ship hull. The ship-based crane, which served for conducting launch and recovery operations, was assumed to be rigid, mimicking the ship dynamics, whereas the payload is modelled as a single-degree-of-freedom pendulum. This study advocates practical engineering approach, applicable to various scenarios with vessels operating in relevant in situ environmental sea and ice conditions. The proposed study intends to contribute to improving launch and recovery operational reliability, as well as motion control, especially in Arctic aquatic regions. When mentioning Arctic and defence technologies, launch and recovery systems have significant relevance for unmanned vehicles onboard ships.</p></div>","PeriodicalId":72251,"journal":{"name":"Applications in engineering science","volume":"15 ","pages":"Article 100146"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42223565","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: 7

Poroelastic problem of a non-penetrating crack with cohesive contact for fluid-driven fracture 流体驱动裂缝中具有粘性接触的非穿透裂纹的孔弹性问题

Applications in engineering science Pub Date : 2023-09-01 DOI: 10.1016/j.apples.2023.100136

Hiromichi Itou , Victor A. Kovtunenko , Nyurgun P. Lazarev

引用次数: 0

Avoiding localization instabilities in rotary pleating 避免旋转打褶中的局部化不稳定性

Applications in engineering science Pub Date : 2023-09-01 DOI: 10.1016/j.apples.2023.100129

Tian Yu , J.A. Hanna

{"title":"Avoiding localization instabilities in rotary pleating","authors":"Tian Yu , J.A. Hanna","doi":"10.1016/j.apples.2023.100129","DOIUrl":"10.1016/j.apples.2023.100129","url":null,"abstract":"<div><p>Rotary pleating is a widely used process for making filters out of nonwoven fabric sheets. This involves indirect elastic–plastic bending of pre-weakened creases by continuously injecting material into an accordion-shaped pack. This step can fail through a localization instability that creates a kink in a pleat facet instead of in the desired crease location. In the present work, we consider the effects of geometric and material parameters on the rotary pleating process. We formulate the process as a multi-point variable-arc-length boundary value problem for planar inextensible rods, with hinge connections. Both the facets (rods) and creases (hinges) obey nonlinear moment–curvature or moment–angle constitutive laws. Some unexpected aspects of the sleeve boundary condition at the point of material injection, common to many continuous sheet processes, are noted. The process, modeled as quasistatic, features multiple equilibria which we explore by numerical continuation. The presence of, presumably stable, kinked equilibria is taken as a conservative sign of potential pleating failure. Failure may also occur due to localization at the injection point. We may thus obtain “pleatability surfaces” that separate the parameter space into regions where mechanical pleating will succeed or fail. Successful pleating depends primarily on the distance between the injection point and the pleated pack. Other factors, such as the crease stiffness and strength relative to that of the facets, also have an influence. Our approach can be adapted to study other pleating and forming processes, the deployment and collapse of folded structures, or multi-stability in compliant structures.</p></div>","PeriodicalId":72251,"journal":{"name":"Applications in engineering science","volume":"15 ","pages":"Article 100129"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49336189","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

A sediment transport theory based on distortion-free-boundary nonhomogeneous fluid flows 基于无畸变边界非均匀流体流动的泥沙输运理论

Applications in engineering science Pub Date : 2023-09-01 DOI: 10.1016/j.apples.2023.100148

Arno Roland Ndengna Ngatcha , Boniface Nkonga

{"title":"A sediment transport theory based on distortion-free-boundary nonhomogeneous fluid flows","authors":"Arno Roland Ndengna Ngatcha , Boniface Nkonga","doi":"10.1016/j.apples.2023.100148","DOIUrl":"10.1016/j.apples.2023.100148","url":null,"abstract":"<div><p>Over the last 50 years several sediment transport models in coastal environments based on Shallow Water(SW) type models have been developed in the literature. The water flow over an abrupt moving topography quickly spatially variable becomes accelerated and strongly varied arising the turbulence (distortion). The acceleration and strong variation of the flow facilitate the transport of a large quantity of sediments present at the bottom while modifying it. The mathematical models based on SW type models widely used to describe the sediment transport phenomena do not account the distortion effects. Indeed, it is well-known that the SW models are derived from first order approximation of long wave theory. The acceleration and strong variation of the water flow near the bottom is due to the distortion of the horizontal velocity profile along the vertical direction. One can regard distortion as a combination of strain and rotation. The effect of the rotational component is to weaken the effect of the strain somewhat. In this work, we put in place a king theory of sediment transport derived from the second order approximation of long wave theory that can describe sediment transport processes in distortion-free-boundary nonhomogeneous fluid flows. The derived model accounts the distortion (fluctuation with great correlation lengths) that creates the turbulence. Moreover, the model differentiates the fluid velocity from sediment velocity (phase-lag) near the sediment bed. The proposed theory significantly reduces the modeling errors observed in several sediment transport models based on nonhomogeneous shallow water equations and has a great potential to increase the predictive power of sediment transport models in rivers, lakes, coastal flows, ocean basins and so on. The proposed theory improves several existing sediment transport theories recently developed in the literature and can be apply with some degree confidence.</p></div>","PeriodicalId":72251,"journal":{"name":"Applications in engineering science","volume":"15 ","pages":"Article 100148"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48733851","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

Chloride permeability through different specimen surfaces of blast-furnace slag cement concrete with and without air-entraining agent 加与不加引气剂的高炉矿渣水泥混凝土试样表面氯离子渗透性研究

Applications in engineering science Pub Date : 2023-09-01 DOI: 10.1016/j.apples.2023.100134

M. Anwar, Dina A. Emarah

{"title":"Chloride permeability through different specimen surfaces of blast-furnace slag cement concrete with and without air-entraining agent","authors":"M. Anwar, Dina A. Emarah","doi":"10.1016/j.apples.2023.100134","DOIUrl":"10.1016/j.apples.2023.100134","url":null,"abstract":"<div><p>Numerous research has investigated the effects of blast furnace slag as a cementitious or substitute cementing material on the characteristics of concrete. Blast furnace slag cement (BFSC) shows promise in the concrete permeability domain, where this extra cementing ingredient enhances the chloride attack resistance of concrete. Four mixtures of BFSC concrete made with 0.5, and 0.6 water-to-cement ratios (w/c) were studied. The effect of using an air-entraining agent (AEA) and a change in the surface of tested samples (top, bottom, and side) on the chloride penetration and its diffusion coefficient has been investigated. The properties of fresh and hardened concrete were determined. This research has its novelty for the first time, where the chloride contents were determined through specimens' top, bottom, and side surfaces using potentiometric titration. The results indicated that the air-entraining agent and w/c ratio had inversely affected the invested concrete properties. The measured total and soluble chloride content at a depth of 20∼30 mm is less than the limits of the corrosion threshold for the three studied surfaces. Also, changes in the w/c ratio, cement content, and AEA affect the diffusion coefficient.</p></div>","PeriodicalId":72251,"journal":{"name":"Applications in engineering science","volume":"15 ","pages":"Article 100134"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43274413","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

Collection of oil mist using a baffle plate-type mist trap 采用挡板式疏雾器收集油雾

Applications in engineering science Pub Date : 2023-09-01 DOI: 10.1016/j.apples.2023.100137

Kotaro Takamure , Tomomi Uchiyama , Shogo Ando , Hayato Kato , Hiroshi Nakayama

{"title":"Collection of oil mist using a baffle plate-type mist trap","authors":"Kotaro Takamure , Tomomi Uchiyama , Shogo Ando , Hayato Kato , Hiroshi Nakayama","doi":"10.1016/j.apples.2023.100137","DOIUrl":"10.1016/j.apples.2023.100137","url":null,"abstract":"<div><p>In the field of metal cutting, the cutting oil scatters in air as a microscale oil mist, which adversely affects the work environment. A baffle plate-type mist trap was manufactured as simple equipment for collecting oil mist floating in air. The oil mist collection rate and pressure loss were determined using experiments and numerical simulations while varying the number of baffle plates and inflow velocity of air. The experimental results showed that the pressure drop increased with the number of baffle plates, whereas the oil mist collection rate improved. It was also clarified that larger particles can be collected as the number of baffle plates increased. Numerical simulations showed that a high amount of oil mist was trapped upstream of the second baffle plate, and the baffle plate placed further downstream had minimal contribution to oil mist collection. In both the experiments and numerical simulations, the oil mist collection efficiency was the highest when six baffle plates were arranged. This is because the pressure drop increases depending on the number of baffle plates, whereas the mist collection rate is almost constant when many baffle plates are placed.</p></div>","PeriodicalId":72251,"journal":{"name":"Applications in engineering science","volume":"15 ","pages":"Article 100137"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46768669","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