Aerodynamic parameter measurement using the wind driven manipulator - Inverse force measurement on wings

1997 ◽  
Author(s):  
Richard Ames ◽  
Richard Ames ◽  
N. Komerath ◽  
J. Magill ◽  
N. Komerath ◽  
...  
Keyword(s):  
Force Measurement ◽  
Parameter Measurement ◽  
Aerodynamic Parameter ◽  
Inverse Force

A New Approach for Identification of Forces on Slender Beams Subjected to Vortex Induced Vibrations

2008 ◽  
Author(s):  
Jie Wu ◽  
Carl M. Larsen ◽  
Karl E. Kaasen
Keyword(s):  
Force Measurement ◽  
Estimation Method ◽  
Hydrodynamic Forces ◽  
Recursive Least Squares ◽  
Beam Model ◽  
Force Estimation ◽  
Vortex Induced Vibrations ◽  
Slender Beams ◽  
Space Formulation ◽  
Inverse Force

Vortex induced vibration (VIV) has been subjected to extensive research during the last 20 years. A large number of laboratory and ocean tests with long slender beams or cables have been reported. Key results from such experiments have been response frequencies and amplitudes, but also information on mode composition and traveling waves. Due to the difficulty of direct force measurement, accelerometer and bending strain measurement are used in such experiments. Formally, it should be possible to identify the forces that have created the measured response, but so far few results from such attempts have been reported. An inverse force estimation method is adopted to provide an accurate way of reconstructing the unknown hydrodynamic forces from measured dynamic response data. The method is based on state space formulation of a finite element beam model. It incorporates the Kalman filtering and recursive least squares algorithm to remove the noise from measurement and obtain force estimation in discrete time domain. The inverse force estimation method is verified with numerical simulations. The input force of a tensioned beam structure is estimated from response. The result indicates its capability to accurately estimate the input forces from stochastic response. The method is applied to the data from Rotating Rig Test to identify hydrodynamic forces along the riser. The lift force and added mass coefficients are calculated and compared with existing data.

Development of a Knee-gap Force Measurement Device to Evaluate Quantitative Lower Limb Muscular Strength of the Elderly

2010 ◽  
Vol 130 (2) ◽  
pp. 267-274 ◽  
Author(s):  
Kazuhiko Yamashita ◽  
Kazuya Imaizumi ◽  
Yumi Iwakami ◽  
Mitsuru Sato ◽  
Sawako Nakajima ◽  
...  
Keyword(s):  
Lower Limb ◽  
Muscular Strength ◽  
Force Measurement ◽  
The Elderly ◽  
Measurement Device

Finite Element Modeling for Steel Cord Analysis in Radial Tires

2013 ◽  
Vol 41 (1) ◽  
pp. 60-79 ◽  
Author(s):  
Wei Yintao ◽  
Luo Yiwen ◽  
Miao Yiming ◽  
Chai Delong ◽  
Feng Xijin
Keyword(s):  
Finite Element ◽  
High Efficiency ◽  
Force Measurement ◽  
Three Dimensional ◽  
Local Stress ◽  
Tension Force ◽  
Center Line ◽  
Element Analysis ◽  
Design Variables ◽  
Steel Cord

ABSTRACT: This article focuses on steel cord deformation and force investigation within heavy-duty radial tires. Typical bending deformation and tension force distributions of steel reinforcement within a truck bus radial (TBR) tire have been obtained, and they provide useful input for the local scale modeling of the steel cord. The three-dimensional carpet plots of the cord force distribution within a TBR tire are presented. The carcass-bending curvature is derived from the deformation of the carcass center line. A high-efficiency modeling approach for layered multistrand cord structures has been developed that uses cord design variables such as lay angle, lay length, and radius of the strand center line as input. Several types of steel cord have been modeled using the developed method as an example. The pure tension for two cords and the combined tension bending under various loading conditions relevant to tire deformation have been simulated by a finite element analysis (FEA). Good agreement has been found between experimental and FEA-determined tension force-displacement curves, and the characteristic structural and plastic deformation phases have been revealed by the FE simulation. Furthermore, some interesting local stress and deformation patterns under combined tension and bending are found that have not been previously reported. In addition, an experimental cord force measurement approach is included in this article.

scholarly journals VirtualCPR: Virtual Reality Mobile Application for Training in Cardiopulmonary Resuscitation Techniques

Sensors ◽  
2021 ◽  
Vol 21 (7) ◽  
pp. 2504
Author(s):  
Francisco Javier García Fierros ◽  
Jesús Jaime Moreno Escobar ◽  
Gabriel Sepúlveda Cervantes ◽  
Oswaldo Morales Matamoros ◽  
Ricardo Tejeida Padilla
Keyword(s):  
Virtual Reality ◽  
Cardiopulmonary Resuscitation ◽  
Mobile Application ◽  
Force Measurement ◽  
Heart Diseases ◽  
Medical Knowledge ◽  
Public Health Problem ◽  
Force Sensor ◽  
Previous Training ◽  
Color Indicator

Deaths due to heart diseases are a leading cause of death in Mexico. Cardiovascular diseases are considered a public health problem because they produce cardiorespiratory arrests. During an arrest, cardiac and/or respiratory activity stops. A cardiorespiratory arrest is rapidly fatal without a quick and efficient intervention. As a response to this problem, the VirtualCPR system was designed in the present work. VirtualCPR is a mobile virtual reality application to support learning and practicing of basic techniques of cardiopulmonary resuscitation (CPR) for experts or non-experts in CPR. VirtualCPR implements an interactive virtual scenario with the user, which is visible by means of employment of virtual reality lenses. User’s interactions, with our proposal, are by a portable force sensor for integration with training mannequins, whose development is based on an application for the Android platform. Furthermore, this proposal integrates medical knowledge in first aid, related to the basic CPR for adults using only the hands, as well as technological knowledge, related to development of simulations on a mobile virtual reality platform by three main processes: (i) force measurement and conversion, (ii) data transmission and (iii) simulation of a virtual scenario. An experiment by means of a multifactorial analysis of variance was designed considering four factors for a CPR session: (i) previous training in CPR, (ii) frequency of compressions, (iii) presence of auditory suggestions and (iv) presence of color indicator. Our findings point out that the more previous training in CPR a user of the VirtualCPR system has, the greater the percentage of correct compressions obtained from a virtual CPR session. Setting the rate to 100 or 150 compressions per minute, turning on or off the auditory suggestions and turning the color indicator on or off during the session have no significant effect on the results obtained by the user.

scholarly journals Is the grip force measurement suitable for assessing overall strength regardless of age and gender?

Measurement ◽  
2021 ◽  
Vol 176 ◽  
pp. 109093
Author(s):  
Danuta Roman-Liu ◽  
Tomasz Tokarski ◽  
Joanna Mazur-Różycka
Keyword(s):  
Grip Force ◽  
Force Measurement ◽  
Age And Gender ◽  
And Gender
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