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Optimization imposition upon drone gimbal control electronics 无人机云台控制电子元件的优化施加
Pub Date : 2023-10-09 DOI: 10.59400/jam.v1i2.69
Erhe Zheng, Timothy Sands
The goal of the manuscript is to design a relatively best control structure for the noise suppression of a drone’s camera gimbal action. The gimbal’s movement can be simplified as a rest-to-rest reorientation system that can achieve the boundary result of a dynamic system. Six different control architectures are proposed and evaluated based on their ability to control the trajectory of the dynamic-system position and speed, their running time, and quadratic cost. The robustness of the control architecture to uncertainties in inertia and sensor noise is also analyzed. Monte Carlo figures are used to assess the performance of the six control systems. The conditions for applying different architectures are identified through this analysis. The analysis and experimental tests reveal the most suitable control of the drone’s camera gimbal rotation.
该手稿的目标是设计一个相对最好的控制结构的噪声抑制无人机的相机万向架的行动。框架的运动可以简化为一个静止到静止的重定向系统,它可以实现一个动态系统的边界结果。提出了六种不同的控制体系结构,并根据其控制动态系统位置和速度轨迹的能力、运行时间和二次成本进行了评估。分析了控制体系对惯性不确定性和传感器噪声的鲁棒性。用蒙特卡罗图来评价六个控制系统的性能。通过此分析确定了应用不同体系结构的条件。通过分析和实验测试,得出了最合适的无人机相机云台旋转控制方法。
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引用次数: 0
Newton’s forward interpolation method for solving nonlinear algebraic equation 求解非线性代数方程的牛顿正演插值法
Pub Date : 2023-10-07 DOI: 10.59400/jam.v1i2.64
Nasr Al Din Ide
As we know, the interpolation is one of the most basic and most useful numerical techniques in Mathematics. Newton’s forward interpolation method is one of most important of these methods. Its most important task in numerical analysis to find roots of nonlinear equations, several methods already exist to find roots. But in this paper, we introduce the interpolation technique for this purpose. The proposed method derived from the newton forward interpolation method and we compared the results with another existing method (Bisection Method (BM), Regula-Falsi Method (RFM), Secant Method (SM), Newton Raphson Method (NRM)) and the method proposed by J. Sanaullah (SJM). It’s observed that the proposed method has fast convergence but it has same order of convergence of the method (SJM). Maple software is used to solve problems by different methods.
众所周知,插值是数学中最基本、最有用的数值技术之一。牛顿正演插值法是其中最重要的方法之一。在数值分析中最重要的任务是求非线性方程的根,目前已有几种求根的方法。但在本文中,我们介绍了为此目的的插值技术。该方法来源于牛顿正插值方法,并与现有的二分法(Bisection method, BM)、正则法(regular - falsi method, RFM)、割线法(Secant method, SM)、牛顿拉夫森法(newton Raphson method, NRM)和J. Sanaullah (SJM)提出的方法进行了比较。结果表明,该方法收敛速度快,但收敛阶数与原方法(SJM)相同。使用Maple软件通过不同的方法解决问题。
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引用次数: 0
(ϵ)-Kenmotsu manifold admitting Schouten-van Kampen connection (ε)-Kenmotsu流形承认Schouten-van Kampen连接
Pub Date : 2023-09-28 DOI: 10.59400/jam.v1i2.113
S. Girish Babu, R. Rajendra, P. Siva Kota Reddy, N. Pavani
The objective of this paper is to study some properties of quasi-conformal and concircular tensor on (ϵ)-Kenmotsu manifold admitting the Schouten-van Kampen connection. Expressions of the curvature tensor, Ricci tensor and scalar curvature admitting Schouten-van Kampen connection have been obtained. Locally symmetric -Kenmotsu manifold admitting Schouten-van Kampen connection and quasicon formally flat as well as quasi-conformally semisymmetric -Kenmotsu manifolds admitting Schouten-van Kampen connection are studied.
本文的目的是研究(λ)-Kenmotsu流形上允许Schouten-van Kampen连接的拟共形共圆张量的一些性质。得到了曲率张量、Ricci张量和标量曲率允许Schouten-van - Kampen连接的表达式。研究了承认Schouten-van Kampen连接的局部对称-Kenmotsu流形和准形形式平面以及承认Schouten-van Kampen连接的拟共形半对称-Kenmotsu流形。
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引用次数: 0
The synergistic effect of the multiple parameters of vibro-impact nonlinear energy sink 振动冲击非线性能量汇多参数的协同效应
Pub Date : 2023-09-12 DOI: 10.59400/jam.v1i3.199
Petro Lizunov, Olga Pogorelova, Tetiana Postnikov
This article studies the dynamics and efficiency of a vibro-impact damper (single-sided vibro-impact nonlinear energy sink—SSVI NES) depending on the exciting force parameters. The damper is coupled with a linear oscillator—the primary structure. It is shown that the damper is quite effective in a wide range of the exciting force amplitude and in the range of its frequency, which are higher than the resonant frequency; damper efficiency in these regions is fairly stable. The dynamics of the vibro-impact system “primary structure—SSVI NES” is rich and complex, which, however, does not impair the damper efficiency. In complex oscillatory regimes, the damper makes bilateral impacts: it hits both an obstacle and directly against the primary structure, which actually turns a single-sided NES into a double‐sided one. The optimization procedure and the choice of optimal damper parameters play a very important role in damper design. Optimizing multiple damper parameters instead of three shows a synergistic effect and provides better results.
本文研究了单面振动冲击非线性能量槽(ssvi NES)阻尼器的动力学和效率随激振力参数的变化规律。阻尼器与一个线性振荡器耦合,这是主要结构。结果表明,阻尼器在较宽的激振力幅值范围内和激振频率范围内都是有效的,激振力幅值范围大于谐振频率;阻尼器在这些区域的效率是相当稳定的。“主结构- ssvi系统”的振动冲击系统动力学丰富而复杂,但这并不影响阻尼器的效率。在复杂的振荡状态下,阻尼器产生双边冲击:它既撞击障碍物,又直接撞击主结构,这实际上将单面NES变成了双面NES。阻尼器的优化过程和最佳参数的选择在阻尼器设计中起着非常重要的作用。优化多个阻尼器参数而不是三个,显示出协同效应,效果更好。
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引用次数: 0
Theory of gyroscopic effects for rotating objects 旋转物体的陀螺效应理论
Pub Date : 2023-09-12 DOI: 10.59400/jam.v1i2.101
Ryspek Usubamatov
Scientists began to study gyroscopic effects at the time of the Industrial Revolution. Famous mathematician L. Euler described only one gyroscopic effect, which is the precession torque that does not explain other ones. Since those times, scientists could not explain the physics of gyroscopic effects, Recent studies and the method of causal investigatory dependency demonstrated, that the nature of gyroscopic effects turned out that be more sophisticated than contemplated by researchers. The external torque acting on the spinning objects generates the system of the eight inertial torques and their interrelated motions around axes presented in the 3D coordinate system. The interrelated torques and motions of the spinning disc were described by mathematical models, and validated by practical tests that explain the physics of the gyroscopic effects based on the kinetic energy conservation law. The inertial torques generated by the centrifugal, and Coriolis forces, the change in the angular momentum, and the dependent motions of the spinning object around axes constitute the fundamental principles of the gyroscope theory. The derived gyroscopic theory opened a new chapter in the dynamics of rotating objects of classical mechanics that should be presented in all word encyclopedias.
科学家们在工业革命时期开始研究陀螺仪效应。著名数学家欧拉只描述了一种陀螺仪效应,即进动扭矩,它不能解释其他效应。从那时起,科学家们就无法解释陀螺仪效应的物理性质。最近的研究和因果调查依赖的方法表明,陀螺仪效应的性质比研究人员所设想的要复杂得多。作用在旋转物体上的外部力矩产生了八个惯性力矩及其相互关联的绕轴运动系统,并在三维坐标系中表示。用数学模型描述了旋转圆盘的相互关联的力矩和运动,并通过实际试验进行了验证,说明了基于动能守恒定律的陀螺仪效应的物理性质。由离心力和科里奥利力产生的惯性力矩、角动量的变化以及旋转物体绕轴的相关运动构成了陀螺仪理论的基本原理。由此衍生的陀螺仪理论为经典力学中旋转物体的动力学打开了一个新的篇章,它应该出现在所有的百科全书中。
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引用次数: 0
Norm of the Hermite-Fejér interpolative operator with derivatives of variable order 具有变阶导数的hermite - fejsamir插值算子的范数
Pub Date : 2023-09-09 DOI: 10.59400/jam.v2i1.87
Alexander Fedotov
A new definition of a variable order derivative is given. It is based on interpolation of integer order differentiation operators. An interpolation operator of the Hermite-Fejér type is built to jointly interpolate the function and its derivative of variable order. The upper estimate of the norm of this operator is obtained. This norm has been shown to be limited.
给出了变阶导数的新定义。它是基于整数阶微分算子的插值。构造了hermite - fejsamir型插值算子,对该函数及其变阶导数进行联合插值。得到了该算子范数的上估计。这一规范已被证明是有限的。
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引用次数: 0
Student satisfaction in higher education: A systematic review examining its impact on institutional growth and comparative dimensions 高等教育中的学生满意度:一项考察其对机构发展影响和比较维度的系统综述
Pub Date : 2023-09-09 DOI: 10.59400/jam.v1i3.91
Shahrukh Aman, Nosheen Aziz, Mohsin Abbas
The purpose of this comprehensive evaluation of the literature is to examine the connection between higher education institution expansion and student satisfaction (SS). The survey also aims to pinpoint the metrics being contrasted right now when gauging student happiness. The review summarizes recent scholarly publications, including books, conference papers, and journal articles. The results give insight into the comparative dimensions used in student satisfaction research and shed light on the influence of student satisfaction on the growth of higher education institutions.
本文对文献进行综合评价的目的是研究高等教育机构扩张与学生满意度之间的关系。该调查还旨在确定衡量学生幸福感的指标。该评论总结了最近的学术出版物,包括书籍,会议论文和期刊文章。研究结果揭示了学生满意度研究中使用的比较维度,并揭示了学生满意度对高等教育机构发展的影响。
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引用次数: 0
Impact of Hindustani ragas in stress management: A statistical study 印度斯坦语ragas对压力管理的影响:一项统计研究
Pub Date : 2023-09-08 DOI: 10.59400/jam.v1i1.143
Soubhik Chakraborty, Avinav Prasad, Apoorva Chakraborty, Prerna Singh
This work is a part of our ongoing research project entitled Hindustani Raga Analysis Using Statistical Musicology with Therapeutic Applications for Stress Management. Using the perceived stress scale (PSS), baseline data were collected on 28 participants, 14 for the control group (non-music intervention group) and the remaining 14 for the case group (music intervention group), the allotment of a participant to one of the groups being done using randomized control trial (RCT) to prevent bias in allocation. After 5 music therapy sessions, the follow-up data were collected and the scores (0, 1, 2, 3, 4) were filled for the 10 questions in the questionnaire of the PSS scale. The rating is 0–13 implying low stress, 14–26 implying moderate stress and 27–40 implying high stress. As per the PSS rule, those having stress levels below 13 were dropped from the study. Thus, the actual number of participants in both groups would be less than those interviewed (sample size n = 7 for each group). Using paired t test, it is found that the case group participants have shown considerable improvement in comparison to the control group. Thus, the efficacy of music intervention in combatting stress is established.
这项工作是我们正在进行的研究项目“印度斯坦拉格分析使用统计音乐学与压力管理治疗应用”的一部分。采用感知压力量表(PSS)收集28名参与者的基线数据,其中14名为对照组(非音乐干预组),其余14名为病例组(音乐干预组),采用随机对照试验(RCT)将参与者分配到其中一组,以防止分配偏差。5个音乐治疗疗程后,收集随访资料,填写PSS量表10个问题的得分(0、1、2、3、4)。等级为0-13表示低压力,14-26表示中等压力,27-40表示高压力。根据PSS规则,压力水平低于13的人被排除在研究之外。因此,两组的实际参与者人数将少于受访人数(每组的样本量n = 7)。使用配对t检验,发现病例组参与者与对照组相比有相当大的改善。因此,音乐干预对抗压力的有效性是确定的。
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引用次数: 0
Conservation laws, exact solutions and nonlinear dispersion: A lie symmetry approach 守恒定律,精确解和非线性色散:一个谎言对称方法
Pub Date : 2023-09-08 DOI: 10.59400/jam.v1i1.95
Adnan Shamaoon, Zartab Ali, Qaisar Maqbool
In this study, we investigated a set of equations that exhibit compact solutions and nonlinear dispersion. We used the classical lie symmetry approach to derive ordinary differential equations (ODEs) that are well suited for qualitative study. By examining the dynamic behavior of these ODEs, we gained insights into the intricate nature of the underlying system. We also used a powerful multiplier approach to establish nontrivial conservation laws and exact solutions for these equations. These conservation laws provide essential information regarding the underlying symmetries and invariants of the system, and shed light on its fundamental properties
在这项研究中,我们研究了一组具有紧解和非线性色散的方程。我们使用经典的李氏对称方法推导出适合定性研究的常微分方程(ode)。通过检查这些ode的动态行为,我们深入了解了底层系统的复杂本质。我们还使用了一个强大的乘数方法来建立这些方程的非平凡守恒定律和精确解。这些守恒定律提供了关于系统潜在的对称性和不变量的基本信息,并阐明了系统的基本性质
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引用次数: 0
Numerical investigation of heat and mass transfer of variable viscosity Casson nanofluid flow through a microchannel filled with a porous medium 变粘度卡森纳米流体在多孔介质微通道中的传热传质数值研究
Pub Date : 2023-09-07 DOI: 10.59400/jam.v1i3.194
Lemi Guta Enyadene, Ebba Hindebu Rikitu, Adugna Fita Gabissa
Thermal behaviours and hydrodynamics of non-Newtonian nanofluids flow through permeable microchannels have large scale utilizations in industries, engineering and bio-medicals. Therefore, this paper presents the numerical investigation of heat and mass transfer of variable viscosity Casson nanofluid flow through a porous medium microchannel with the Cattaneo-Christov heat flux theory. The highly nonlinear PDEs corresponding to the continuity, momentum, energy and concentration equations are formulated and solved numerically via the second order implicit finite difference scheme known as the Keller-Box method. Accordingly, the numerical simulations reveal that variable viscosity parameter, thermal Grashof number, solutal Grashof number, thermophoresis parameter, Schmidt number and Casson fluid parameter show increasing effects on both velocity and temperature of the nanofluid. Furthermore, the temperature profile escalates with increasing values of the Eckert number and the thermal relaxation time parameter. Thus, the Cattaneo-Christov heat flux model is beneficial in warming the transport system of microfluidics when compared to that of the classical Fourier heat conduction law. The temperature profile however, indicates a retarding behavior with increasing values of the Brownian motion parameter, Prandtl number and porous medium parameters namely Forchheimer number and porous medium shape parameter and hence, the porous medium quite effectively controls the nanofluid temperature distribution which plays substantial roles in cooling the transport system of microfluidics. Moreover, the concentration profile shows an increasing pattern with escalating values of the Prandtl number, Schmidt number and thermophoresis parameter but it demonstrates a decreasing trend with the Casson fluid, variable viscosity, thermal relaxation time and solutal relaxation time parameters. It is also observed that coefficient of the skin friction increases with increasing values of the pressure gradient parameter, Eckert number, Forchheimer number and injection/suction Reynolds number. Besides, the heat transfer rate at both walls of the microchannel enhances with rising values of the Eckert number, variable viscosity, parameter and injection/suction Reynolds number. The Casson fluid and thermal relaxation time parameters reveal opposite scenarios on the heat transfer rate at the left and right walls of the microchannel. In addition, the mass transfer rate at both walls of the microchannel shows an increasing pattern as the Eckert number, variable viscosity parameter, Schmidt number and suction/injection Reynolds number increase.
非牛顿纳米流体通过可渗透微通道的热行为和流体动力学在工业、工程和生物医学中具有大规模的应用。因此,本文采用Cattaneo-Christov热流密度理论对变粘度卡森纳米流体在多孔介质微通道中的传热传质进行了数值研究。高度非线性偏微分方程对应于连续性、动量、能量和浓度方程,并通过二阶隐式有限差分格式Keller-Box法进行数值求解。数值模拟结果表明,变粘度参数、热格拉什夫数、溶质格拉什夫数、热进样参数、施密特数和卡森流体参数对纳米流体的速度和温度的影响均呈递增趋势。温度分布随Eckert数和热松弛时间参数的增大而增大。因此,与经典傅立叶热传导定律相比,Cattaneo-Christov热流密度模型有利于微流体输运系统的升温。随着布朗运动参数、普朗特数和多孔介质参数(即Forchheimer数和多孔介质形状参数)的增大,温度分布表现出一种延迟行为,因此多孔介质可以有效地控制纳米流体的温度分布,对微流体输运系统的冷却起着重要作用。随着普朗特数、施密特数和热泳参数的增大,其浓度分布呈增加趋势,而随着卡森流体、变粘度、热弛豫时间和溶质弛豫时间参数的增大,其浓度分布呈下降趋势。表面摩擦系数随压力梯度参数、Eckert数、Forchheimer数和注射/吸力雷诺数的增大而增大。同时,随着Eckert数、变黏度、参数和注射/吸力雷诺数的增大,微通道两侧壁面的换热速率增大。卡森流体和热松弛时间参数揭示了微通道左右壁面换热速率的相反情况。此外,随着Eckert数、变粘度参数、Schmidt数和吸注雷诺数的增加,微通道两侧壁面传质速率呈增加趋势。
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引用次数: 0
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Journal of AppliedMath
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