International Journal of Mechanics最新文献_第4页

Vibration Absorption using KDamper-based Devices with Extreme Geometric Nonlinearity 使用具有极端几何非线性的KDamper基器件的振动吸收

International Journal of Mechanics Pub Date : 2022-02-10 DOI: 10.46300/9104.2022.16.3

K. Kapasakalis, E. Sapountzakis

{"title":"Vibration Absorption using KDamper-based Devices with Extreme Geometric Nonlinearity","authors":"K. Kapasakalis, E. Sapountzakis","doi":"10.46300/9104.2022.16.3","DOIUrl":"https://doi.org/10.46300/9104.2022.16.3","url":null,"abstract":"A KDamper oscillator is proven to be a more effective alternative to conventional Tuned Mass Damper (TMD) approaches and Quazi Zero Stiffness (QZS) or negative stiffness isolators. In this paper, an extended version of the KDamper (EKD) concept is employed to control the dynamic responses of an undamped (or low damper) SDoF system subjected to various dynamic loads. The KDamper consists of an additional mass, artificial dampers, and positive and negative stiffness elements. The additional implemented mass is one order of magnitude smaller as compared to most mass related vibration absorbers (TMDs, TMDIs, KDampers, etc.). The artificial dampers and the stiffness element values are selected following an engineering-criteria driven optimization procedure that accounts for geometric constraints and manufacturing limitations. The negative stiffness element is realized with an articulated mechanism that employs pre-stresses conventional stiffness elements (spiral springs) and generates controlled negative stiffness (NS). In order to exploit the advantages that the inherent nonlinear nature the NS offers, such as robustness, broadband response and energy sinks, the proposed dynamic vibration absorber is designed to present significant geometric nonlinearity, that varies from none (linear system) to extreme. Thus, different test cases are presented with respect to the desired nonlinearity of the generated NS, as well as to the type of the external load subjected to the structure. This way we can determine in which cases extreme geometric nonlinearity is beneficial to the dynamic behavior of the controlled structure.","PeriodicalId":39203,"journal":{"name":"International Journal of Mechanics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44333651","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

LMS Filter Based Frequency Domain System Identification of Mass – Spring – Damper System with Varying Dynamics 基于LMS滤波器的变动态质量-弹簧-阻尼器系统频域辨识

International Journal of Mechanics Pub Date : 2022-01-17 DOI: 10.46300/9104.2022.16.1

Winston Netto, Eloy Pena Asensio, S. M. Sundaram, C. Srinivasan

引用次数: 0

Ergonomics Simulation and Analysis of Specially Designed Chair 特殊设计座椅的人体工程学仿真与分析

International Journal of Mechanics Pub Date : 2021-12-31 DOI: 10.46300/9104.2021.15.31

S. Mohamaddan, Aliff Rahman, M. Shanat, Siti Zawiah Md Dawal, A. Hanafusa

引用次数: 1

Using Machine Learning Algorithms to Detect Anomalies in the Solar Heating System 利用机器学习算法检测太阳能供暖系统中的异常

International Journal of Mechanics Pub Date : 2021-12-31 DOI: 10.46300/9104.2021.15.32

M. Kunelbayev, Abdildayeva Assel, Taganova Guldana

引用次数: 0

Cooling Temperature and Heat Transfer Coefficients in Cylindrical Heat Exchangers 圆柱形换热器的冷却温度和传热系数

International Journal of Mechanics Pub Date : 2021-12-28 DOI: 10.46300/9104.2021.15.29

E. T. Tamayo, José W. Morales, Mauro D. Albarracín, Héctor L. Laurencio, Israel P. Pachacama, Brayan I. Guacapiña, Wilson M. Román

引用次数: 0

Spectral Analysis of Translation-Invariant Mechanical Systems with Application to Structural Vibrations and Stability 平移不变机械系统的谱分析及其在结构振动和稳定性中的应用

International Journal of Mechanics Pub Date : 2021-12-06 DOI: 10.46300/9104.2021.15.28

N. Banichuk, A. Barsuk, S. Ivanova, T. Tuovinen

引用次数: 0

Application of Two-dimensional Finite Volume Method to Protoplanetary Disks 二维有限体积法在原行星盘中的应用

International Journal of Mechanics Pub Date : 2021-10-20 DOI: 10.46300/9104.2021.15.27

T. Chakkour

{"title":"Application of Two-dimensional Finite Volume Method to Protoplanetary Disks","authors":"T. Chakkour","doi":"10.46300/9104.2021.15.27","DOIUrl":"https://doi.org/10.46300/9104.2021.15.27","url":null,"abstract":"Many fascinating astrophysical phenomena can be simulated insufficiently by standard numerical schemes for the compressible hydrodynamics equations. In the present work, a high performant 2D hydrodynamical code has been developed. The model is designed for the planetary formation that consists of momentum, continuity and energy equations. Since the two-phase model seems to be hardly executed, we will show in a simplified form, the implementation of this model in one-phase. It is applied to the Solar System that such stars can form planets. The finite volume method (FVM) is used in this model. We aim to develop a first-order well-balanced scheme for the Euler equations in the the radial direction, combined with second-order centered ux following the radial direction. This conception is devoted to balance the uxes, and guarantee hydrostatic equilibrium preserving. Then the model is used on simplified examples in order to show its ca- pability to maintain steady-state solutions with a good precision. Additionally, we demonstrate the performance of the numerical code through simulations. In particularly, the time evolution of gas orbited around the star, and some proper- ties of the Rossby wave instability are analyzed. The resulting scheme shows consequently that this model is robust and simple enough to be easily implemented.","PeriodicalId":39203,"journal":{"name":"International Journal of Mechanics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44379030","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

A Review on the Application of Multiphase Twin Screw Pump as a Downhole Wet Gas Compressor to Improve Gas Wells Recovery Factor 多相双螺杆泵作为井下湿气压缩机在提高气井采收率中的应用综述

International Journal of Mechanics Pub Date : 2021-10-14 DOI: 10.46300/9104.2021.15.26

S. Dol, Niraj Baxi, M. A. Said

{"title":"A Review on the Application of Multiphase Twin Screw Pump as a Downhole Wet Gas Compressor to Improve Gas Wells Recovery Factor","authors":"S. Dol, Niraj Baxi, M. A. Said","doi":"10.46300/9104.2021.15.26","DOIUrl":"https://doi.org/10.46300/9104.2021.15.26","url":null,"abstract":"By introducing a multiphase twin screw pump as an artificial lifting device inside the well tubing (downhole) for wet gas compression application; i.e. gas volume fraction (GVF) higher than 95%, the unproductive or commercially unattractive gas wells can be revived and made commercially productive once again. Above strategy provides energy industry with an invaluable option to significantly reduce greenhouse gas emissions by reviving gas production from already existing infrastructure thereby reducing new exploratory and development efforts. At the same time above strategy enables energy industry to meet society’s demand for affordable energy throughout the critical energy transition from predominantly fossil fuels based resources to hybrid energy system of renewables and gas. This paper summarizes the research activities related to the applications involving multiphase twin screw pump for gas volume fraction (GVF) higher than 95% and outlines the opportunity that this new frontier of multiphase fluid research provides. By developing an understanding and quantifying the factors that influence volumetric efficiency of the multiphase twin screw pump, the novel concept of productivity improvement by a downhole wet gas compression using above technology can be made practicable and commercially more attractive than other production improvement strategies available today. Review and evaluation of the results of mathematical and experimental models for multiphase twin screw pump for applications with GVF of more than 95% has provided valuable insights in to multiphase physics in the gap leakage domains of pump and this increases confidence that novel theoretical concept of downhole wet gas compression using multiphase twin screw pump that is described in this paper, is practically achievable through further research and improvements.","PeriodicalId":39203,"journal":{"name":"International Journal of Mechanics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43630654","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

Closed Loop Performance Analysis of Classical PID and Robust H-infinity Controller for VTOL Unmanned Quad Tiltrotor Aerial Vehicle 垂直起降四旋翼无人机经典PID和鲁棒H∞控制器的闭环性能分析

International Journal of Mechanics Pub Date : 2021-10-04 DOI: 10.46300/9104.2021.15.25

Navya Thirumaleshwar Hegde, A. Vaz, C. G. Nayak

{"title":"Closed Loop Performance Analysis of Classical PID and Robust H-infinity Controller for VTOL Unmanned Quad Tiltrotor Aerial Vehicle","authors":"Navya Thirumaleshwar Hegde, A. Vaz, C. G. Nayak","doi":"10.46300/9104.2021.15.25","DOIUrl":"https://doi.org/10.46300/9104.2021.15.25","url":null,"abstract":"Unmanned Aerial Vehicles (UAVs) guidance, control and navigation have directed the attention of many researchers in both aerospace engineering as well as control theory. Due to the unique rotor structure of Tiltrotor hybrid UAVs, they exhibit special application value. Quad Tiltrotor UAVs set up a distinctive platform that satisfies the needs of the varying mission requirements by combining the conventional features of high-speed cruise capabilities of an aircraft and hovering capabilities of a helicopter and by tilting its four rotors. The aim of this research article is to control the attitude and altitude of the UAV in the presence of uncertainty using two different control techniques. This paper addresses the comparative analysis of the robust H-infinity controller with classical PID control designs for the transition manoeuvre of a hybrid UAV: the VTOL Tiltrotor UAV. The proposed controllers achieve hover to cruise mode transition and vice-versa. The main idea behind the design of controller is to model and analyze the UAV’s position and attitude dynamics. The desired flight trajectory and the transition manoeuvre is achieved by controlling the tilt angle in 15° intervals from 90° to 0° and vice-versa. Performance index subjected to IAE is estimated and compared for both the controllers in the presence of noise, disturbances and uncertainties. The results of simulation illustrate that the robust H-infinity controller achieves better transition, good adaptability, robust performance and robust stability for the whole flight envelope when compared with the PID controller.","PeriodicalId":39203,"journal":{"name":"International Journal of Mechanics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47802034","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: 2

Investigation of Physical Properties of Fe(III) Containing Metal-Organic Polymers 含铁(III)金属有机聚合物的物理性质研究

International Journal of Mechanics Pub Date : 2021-09-13 DOI: 10.46300/9104.2021.15.24

A. Y. Ershova, Minggong Sha

引用次数: 2