Fluidelastic instability of a single flexible cylinder subject to fluid cross flow has been investigated in arrays of rigid tubes arranged in a normal triangular configuration with pitch ratios of and . The test facility designed and built for this purpose has two novel features: (i) the flexible tube is supported by a linear structure which allows only pure translation of the tube in a directi...

Abstract This paper reports experimental data for the dynamic properties (i.e. first fundamental flexural frequency, damping ratio, comfort class) of ten web-core sandwich panel FRP composite footbridges in Belgium, which contributes to assessment relevant input parameters design and this promising bridge type, quickly gaining popularity recent years. The is gathered based on smartphone acceler...

There are in the literature several theories to explain the mass loss in stellar winds. In particular, for late-type stars, some authors have proposed a wind model driven by an outward-directed flux of damped Alfvén waves. The winds of these stars present great amounts of dust particles that, if charged, can give rise to new wave modes or modify the pre-existing ones. In this work, we study how...

A frequency domain system modelling technique is developed for mechanical systems. The technique is derived from Tellegen's Theorem for electrical networks and is applied to discrete mechanical systems. The elements are modelled in terms of their mechanical impedances. A global system model is assembled from the constitutive impedances. The global system model is used to determine the model exa...

For systems with large degrees of freedom, it is difficult to guess meaningful values of Rayleigh damping coefficients α and β at the start of an analysis. A number of general-purpose commercially available have the provision of providing the value of α and β for calculation of Rayleigh damping matrix for dynamic analysis of systems with multi-degree of freedom. Since an engineer may not be in ...

For the analysis of vegetation areas using satellites, a variety of vegetation indexes such as NDVI and EVI have been developed. However, most indexes have weak response to grasping the type and quality (the growth state and situation) of vegetation. To grasp these vegetation characteristics, we have developed new vegetation indexes, i.e. shadow index (SI) and water stress trend (WST). We estim...

This article introduces the basic principles of four kinds inerters applied for structural vibration control including a traditional inertial mass damper and ideal clutch inerter damper. The with all damping (clutch damper_all damped) partial damper_part are distinguished in detail. First, series energy indexes defined further analysis. Second, effect displacement uncontrolled structure inerter...

This project proposes a novel objective function and algorithm to obtain a set of optimal power system stabilizer (PSS) parameters that include a feedback signal of a remote machine and local and remote input signal ratios for each machine in a Multi-machine power system under various operating conditions. A novel function called the damping scale is proposed and formulated as an objective func...