Discover the eternal value of your finite time - and intentionally choose the meaningful over the urgent every single day.Our culture makes it so that even the most organized and efficient among us feels the pressure of the ticking clock and the possibility and regret of missing out. Modern life has evolved in a way that sets us up for stress, pressure, and overload. New norms and attitudes tap into deeply wired psychological impulses that make it harder than ever to take control of your time. Many of us also have innate personality traits that make the struggle even worse.No wonder time can become a tyrant that leaves us chronically stressed and discontented. Unlock an approach to life that best-selling author Valorie Burton calls “living timelessly”. You will come to understand:The gradual changes that have led us to a place where having too much to do and too little time to do it is the normThe vision for what it could look like if you were free from the stress of time and how to blast through the obstacles to those possibilitiesThe practical steps to choosing the meaningful over the urgent so that your life is unhurried yet purposeful and reflects the values and impact that are unique to you.It’s About Time helps you reimagine a life that is meaningful, at a pace that is natural, with a load that is doable and equips you with the tools to make it happen. Assessments and exercises available in the audiobook companion PDF download. PLEASE NOTE: When you purchase this title, the accompanying PDF will be available in your Audible Library along with the audio. 1. Language: English. Narrator: Valorie Burton. Audio sample: http://samples.audible.de/bk/tnwd/001425/bk_tnwd_001425_sample.mp3. Digital audiobook in aax.
The structural behavior of perforated composite web plate girders under shear loading is studied. Five steel plate girders have been tested. Two of them are reference girders, unperforated and perforated. The perforated webs in the three other girders are strengthened with carbon fiber reinforced polymer(CFRP) laminates in different patterns. The diameter of the central circle opening is 300 mm, where is 60% of the web depth. It is found from the experimental work that the ultimate shear load for the perforated composite web plate girder is higher than the reference perforated girder in a range of 100% to 134% depending on the orientation of the fiber in CFRP laminates. Through the experimental results, new formulas are presented to predict the ultimate shear load of perforated strengthened steel girders by CFRP laminates . A nonlinear finite element analysis is carried out for the tested plate girders using the package software program (ANSYS V.14.5). The analytical results contain the distribution of Von Mises stresses, which is useful to have a better understanding to the results obtained from the experimental tests.
The primary purpose of writing this book is to support the learners and is prepared for case study projects. This book deals with the analytical formulation and finite element analysis of stiffened cylindrical hulls (different stiffener shapes) for minimizing the buckling pressure. The numerical design of isotropic hull is critical for submersibles such as Autonomous Underwater Vehicles (AUV), Remotely Operated Vehicles (ROV), submarines etc. Offshore drilling rings have led to an increasing demand for optimized structural design of pressure hull in Naval applications. An analytical model was developed for the prediction of the minimum buckling load with stiffened cylindrical hulls. The advent of this book is to prepare the analytical model of pressure hull along with stiffeners (both ring and T ) to withstand the buckling pressures and to reduce the failure. This book is evident from analytical and numerical methods that both the formulations are in close agreement with each other.
In this work, stability aspect of the power system, undergoing three-phase symmetrical fault, has been considered. When a fault occurs, the load angle increases and it may lead to loss of synchronism depending upon the severity of fault. Normally the fault affects two main aspects of power system: transient stability and terminal voltage (voltage regulation). For proper operation of power system it is required to control the system under abnormal condition. The linear and nonlinear control applications to power system undergoing fault are discussed. Stability of a power system mostly depends upon the magnitude and location of the disturbance and to a lesser extent on the initial state or operating condition of the system. The objective here is to design controller to restore the system to pre-fault operating conditions in finite time.
Cellular quay walls constructed of interlocking steel sheets are used in marine environments as cofferdams, retaining walls, mooring dolphins, and lock guide walls. When the live load of the Cellular quay walls is expected to increase due to change in serviceability conditions, analysis is required to ensure adequate safety of the structural elements against overstressing. In most cases, a retrofitting of the cellular quay wall is required for the structure to withstand the newly imposed changes. This study presents four methods for retrofitting the cellular quay walls to increase its carrying capacity and decrease the stresses in its skin assuming that the overall stability of the wall is not compromised. Analysis of the original cellular quay wall and proposed retrofitting methods are preformed utilizing three-dimensional finite elements method using the commercial software package ANSYS 11.0.
Determination of allowable pressure, which is one of the important criteria to evaluate the acceptability of pipe bends with shape irregularities, is complex as the analytical solution of the problem involves solution of complex differential equations. Finite element analysis is used in this paper to determine the allowable pressure ratio for pipe bends with varied range of ovality and thinning/thickening and external pressure. A set of pipe bends with shape irregularities obtained from ANSYS analysis is used to obtain a mathematical relationship between various design parameters of pipe bends namely pipe diameter, wall thickness, bend radius, ovality, thinning/thickening and the internal/external pressure load. The possible flexibility that can be introduced in the selection of ovality and thinning limits of pipe bends to reduce rejection has been suggested. A general mathematical expression relating internal pressure, shape imperfections and bend geometry is also presented. The analysis is carried over with structural ANSYS software.
Plate/panels are the main load bearing components in many structural applications. Such structures are frequently appended with beams/ribs/stiffeners to achieve enhanced strength and weight optimization and referred as stiffened plates/shells. So the analysis of such stiffened structures is of practical importance. Because of unavailability of robust analytical model for analysis of such structures, use of computer-based numerical method like the Finite Element (FE) method seems to be the only feasible option. The present book sketches an overview on the existing state of art for FE analysis of such stiffened plates. Further, a more efficient, robust and simple stiffened plate finite element model is developed and its accuracy and efficiency is demonstrated for analysis of laminated composite and functionally graded stiffened plates of different shape and varying stiffener configuration. A simple and efficient semi refined higher-order sheat deformation theory (SRHSDT7) and a novel least square of error (LSE) method of accurate transverse stress recovery technique for laminated composites are presented. The book may serve as a benchmark on FE analysis of stiffened plates in future.
Gears are most common means of transmitting power in the modern world. Gears are used to change the speed and power ratio as well as direction between an input and output shaft. The constant pressure to build less expensive, quieter running, light weight, and more powerful machinery has resulted in a steady improvement of gear designs. At present much is known about gear load carrying capacity and many complicated processes are available to make gears. In the present study a spur gear is investigated using a two dimensional finite element model. The two dimensional model offers significant advantages for dynamic gear analysis. The gear teeth are analysed for different operating speeds. The finite element analysis software ANSYS12 APDL has been used on the model to find the stresses, strains and displacements.
Cylindrical steel storage tanks are widely used for the storage of various liquids, industrial chemicals and firefighting waters. They have also been used for cooling purposes in nuclear power plants in recent years. This book focuses on the seismic design ground supported cylindrical (vertical) steel liquid storage tanks. Dimensions of cylindrical open-top, flat-closed, conical-closed and torispherical-closed-top tanks were determined for 3D-finite element method (FEM) models in an ANSYS Workbench software. The seismic analyses were conducted under the El-Centro and Kobe earthquake loads at different shell thickness and roof types of cylindrical steel tanks. Directional deformation, Equivalent stress, and buckling results presented for both impulsive and convective masses respectively. One purpose of this book is to strengthen of the cylindrical steel liquid tanks. The tanks were covered with epoxy-carbon composite material. The other significant chapter of this book is impact analysis. The impact analysis observed on the plastic deformation of the shell under the instantaneous short duration earthquake load.