The Engineering Characteristics of Snow Skis—Part 1: Static Bending and Torsional Characteristics

1975 ◽  
Vol 97 (1) ◽  
pp. 131-137 ◽  
Author(s):  
A. Deak ◽  
J. Jorgensen ◽  
J. Vagners
Keyword(s):  
Experimental Studies ◽  
Beam Theory ◽  
Experimental Techniques ◽  
Experimental Setup ◽  
New Materials ◽  
Engineering Characteristics ◽  
Analytical Results ◽  
Geometric Arrangements

This paper presents the results of analytical and experimental studies of static bending and torsional characteristics of snow skis. The purpose of the work is to develop analytical and experimental techniques that would be useful to the ski designer who must continually explore the applicability of new materials and geometric arrangements to snow ski construction. A brief review of composite shallow beam theory is presented in a form directly applicable to ski analysis. The experimental setup to verify the analytical results is described.

Vibrations of Foundations Interacting With Subsoil Experimental Studies and BE Calculations

1991 ◽  
Author(s):  
L. Gaul
Keyword(s):  
Boundary Element Method ◽  
Dynamic Response ◽  
Surface Waves ◽  
Boundary Element ◽  
Constitutive Equations ◽  
Experimental Studies ◽  
Boundary Elements ◽  
Experimental Techniques ◽  
Embedded Structures ◽  
Element Method

Abstract Calculation of the dynamic response of sensitive structures like foundations for vibrating machinery requires to take the interaction with subsoil into account. Structures and soil are discretized by boundary elements and coupled by a substructure technique. Viscoelastic constitutive equations contain fractional time derivatives. Surface waves generated by machine foundations and diffracted by embedded structures and soil inhomogeneities are analyzed by conventional and optoelectronic experimental techniques and calculated by the boundary element method (BEM).

Development of an Adjustable Frequency Device for a Test Vehicle Based on Curved Beam Theory

2021 ◽  
Vol 8 ◽  
pp. 5-8
Author(s):  
J. D. Yau ◽  
S. Urushadze
Keyword(s):  
Experimental Studies ◽  
Beam Theory ◽  
Frequency Measurement ◽  
Curved Beam ◽  
Beam Model ◽  
Lumped Mass ◽  
Test Beam ◽  
Test Vehicle ◽  
Instrumented Vehicle ◽  
Thin Beams

In this article, an adjustable frequency device based on curved beam theory is designed to control vertical stiffness of an instrumented vehicle that it can detect dynamic data when moving on a test beam for frequency measurement. The adjustable frequency device consists of a set of two-layer cantilever semi-circular thin-beams to support a lumped mass for vibrations, in which a rotatable U-frame is used to change its subtended angle for adjustment of the supporting stiffness and corresponding vertical frequencies of the vehicle. Based on curved beam theory, an analytical frequency equation of the single-degree-of-freedom test vehicle was derived and applied to mobile frequency measurement of a simple beam. To determine the sectional rigidity of the semi-circular thin-beams, both theoretical and experimental studies were be carried out in the ITAM laboratory of the Academy of Science in Czech. The analytical and experimental results indicated that the present semi-circular beam model with guided ends is applicable to prediction of natural frequencies of the test vehicle considering different supporting stiffness

scholarly journals Experimental investigation of a gel fuel combustion process initiated by a hot particle

2018 ◽  
Vol 209 ◽  
pp. 00025
Author(s):  
Aleksandr Nigay ◽  
Dmitriy Glushkov
Keyword(s):  
High Speed ◽  
Initial Temperature ◽  
Combustion Process ◽  
Experimental Studies ◽  
Chemical Processes ◽  
Metal Particles ◽  
Experimental Setup ◽  
Ignition Delay Times ◽  
Delay Times ◽  
Physical And Chemical

Experimental studies were performed for crude oil-based fuel samples. The initial temperature of the samples varied down to 120 K. Ignition was performed by single metal particles of various shapes and temperatures, which reached 1350 K. A specially developed experimental setup allowed recording of the proceeding processes at a high speed. As a result, the characteristics of physical and chemical processes were analysed. Conditions necessary for stable ignition and ignition delay times were determined depending on various conditions.

scholarly journals Concrete propensity to fire spalling: testing and observations

2018 ◽  
Vol 163 ◽  
pp. 02004 ◽  
Author(s):  
Izabela Hager ◽  
Katarzyna Mróz ◽  
Tomasz Tracz
Keyword(s):  
Cement Paste ◽  
Experimental Studies ◽  
Experimental Techniques ◽  
Concrete Slabs ◽  
Cement Type ◽  
Material Parameters ◽  
Constant Content

This article presents results of fire spalling tests on small concrete slabs and studies of material parameters that may increase its occurrence. Experimental techniques enabling to study and determination of material features are presented and discussed. Experimental studies on spalling behaviour of elements were carried out on seven different concrete mixes with constant content of cement paste and mortar. Research aimed at determining influence of the following parameters: w/c ratio (0.30; 0.45; 0.60), cement type (CEM I, CEM III) and type of aggregates (riverbed gravel, granite, basalt) on fire concrete spalling. Paper discusses also the influence of cold rim that forms while testing slab-like element is subjected to one-side heating.

The Role of the Site Sizes in Hydridation of Laves Phases (C14)

2002 ◽  
Vol 2002 (12) ◽  
pp. 620-621
Author(s):  
Mustapha Boulghallat ◽  
Ahmed Jouaiti ◽  
Norbert Gerard
Keyword(s):  
Intermetallic Compound ◽  
Experimental Studies ◽  
New Materials ◽  
Laves Phases ◽  
Basic Criterion ◽  
The Subject ◽  
Good Agreement ◽  
Nickel Cadmium

New materials, especially AB2 substituted compounds are able to form reversible hydrides and are good candidates to substitute the cadmium in rechargeable nickel–cadmium batteries. These systems have been the subject of several theoretical and experimental studies, particularly concerning the reaction between hydrogen and the Laves phases(C14) containing zirconium. We have shown previously that the A2B2 site size is the basic criterion which allows manipulation of the characteristic properties (kinetic and thermodynamic) of intermetallic compound hydrides Zr(MxCr1-x)2 with M=Fe, Ni. In order to generalise the validity of our criterion, we have extended our study to other Laves phases (C14) in the literature. The results are found to be in good agreement.

scholarly journals Review of Whole Head Experimental Cochlear Promontory Vibration with Bone Conduction Stimulation and Investigation of Experimental Setup Effects

2021 ◽  
Vol 25 ◽  
pp. 233121652110527
Author(s):  
Srdjan Prodanovic ◽  
Stefan Stenfelt
Keyword(s):  
Bone Conduction ◽  
Experimental Studies ◽  
Element Model ◽  
Experimental Setup ◽  
Vibration Level ◽  
Complete Replacement ◽  
Vibration Data ◽  
Experimental Protocols ◽  
The Brain ◽  
Head Neck

Bone conduction sound transmission in humans has been extensively studied using cochlear promontory vibrations. These studies use vibration data collected from measurements in live humans, whole cadavers, and severed cadaver heads, with stimulation applied either at an implant in the skull bone or directly on the skin. Experimental protocols, methods, and preparation of cadavers or cadaver heads vary among the studies, and it is currently unknown to what extent the aforementioned variables affect the outcome of those studies. The current study has two aims. The first aim is to review and compare available experimental data and assess the effects of the experimental protocol and methods. The second aim is to investigate similarities and differences found between the experimental studies based on simulations in a finite element model, the LiUHead. With implant stimulation, the average cochlear promontory vibration levels were within 10 dB, independent of the experimental setup and preparations of the cadavers or cadaver heads. With on-skin stimulation, the results were consistent between cadaver heads and living humans. Partial or complete replacement of the brain with air does not affect the cochlear promontory vibration, whereas replacing the brain with liquid reduces the vibration level by up to 5 dB. An intact head–neck connection affects the vibration of the head at frequencies below 300–400 Hz with a significant vibration reduction at frequencies below 200 Hz. Removing all soft tissue, brain tissue, and intracranial fluid from the head increases the overall cochlear promontory vibration level by around 5 dB.

scholarly journals Investigation of ferroresonanse phenomena and its possibilities of occurrence in the operation of 6-220 kV electromagnetic transformer

2021 ◽  
Vol 288 ◽  
pp. 01058
Author(s):  
Andrew Tychkin ◽  
Andrew Yablokov ◽  
Vladimir Lebedev ◽  
Nikita Rodin ◽  
Maksim Batmanov
Keyword(s):  
Mathematical Modeling ◽  
Influencing Factors ◽  
Experimental Studies ◽  
Experimental Setup ◽  
Voltage Transformer ◽  
Physical And Mathematical Modeling

Ferroresonance phenomena lead to damage to electromagnetic measuring voltage transformers and nearby equipment. Damping devices and antiresonance transformers, which are used for preventing the occurrence of ferroresonance phenomena, are effective in a certain area of influencing factors. The article presents methods for studying the possibility of occurrence of ferroresonance phenomena in the operation of 6-220 kV voltage transformers based on physical and mathematical modeling. The results of the tests according to the developed method are the area of the existence of a dangerous ferroresonance for the voltage transformer under test or the confirmation of its antiresonance properties in a certain range of influencing factors under study. The article also describes an experimental setup based on RTDS for conducting experimental studies. The developed methods were tested in the studies of one of the types of antiresonance transformers.

Research Progress on Mechanical Properties of Short Carbon Fibre/Epoxy Composites

2019 ◽  
Vol 12 (1) ◽  
pp. 3-13 ◽  
Author(s):  
Guanghui Zhao ◽  
Jijia Zhong ◽  
Y.X. Zhang
Keyword(s):  
Mechanical Properties ◽  
Carbon Fibre ◽  
Mechanical Performance ◽  
Experimental Studies ◽  
Weight Ratio ◽  
Epoxy Composites ◽  
Experimental Techniques ◽  
Research Progress ◽  
Future Research ◽  
Short Carbon

Background: Short carbon fibre reinforced epoxy composites have many advantages such as high strength-to-weight ratio, corrosion resistance, low cost, short fabrication time and easy manufacturing. Researches on the mechanical performance of the composites are mainly carried out by means of experimental techniques and numerical calculation. Objective: The study aims to report the latest progress in the studies of mechanical properties of short carbon fibre reinforced epoxy composites. Methods: Based on recently published patents and journal papers, the experimental studies of short carbon fibre reinforced epoxy composites are reviewed and the effects of short carbon fibre on the mechanical properties of the composites are discussed. Numerical studies using representative volume element in simulating macroscopic mechanical properties of the short fibre reinforced composites are also reviewed. Finally, future research of short carbon fibre reinforced epoxy composites is proposed. Results: Experimental techniques, experimental results and numerical simulating methods are discussed. Conclusion: Mechanical properties of epoxy can be improved by adding short carbon fibres. Fiber surface treatment and matrix modification are effective in enhancing interfacial adhesion between fiber and matrix, and as a result, better mechanical performance is achieved. Compared to the studies on equivalent mechanical properties of the composites, researches on the micro-mechanism of interaction between fiber and matrix are still in infancy due to the complexity of both the internal structure and reinforcing mechanism.

scholarly journals Adsorption and anticorrosive behavior of aromatic epoxy monomers on carbon steel corrosion in acidic solution: computational studies and sustained experimental studies

RSC Advances ◽  
2019 ◽  
Vol 9 (26) ◽  
pp. 14782-14796 ◽  
Author(s):  
Omar Dagdag ◽  
Zaki Safi ◽  
Hamid Erramli ◽  
Omar Cherkaoui ◽  
Nuha Wazzan ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Corrosion Inhibition ◽  
Acidic Solution ◽  
Experimental Studies ◽  
Steel Corrosion ◽  
Experimental Techniques ◽  
Computational Studies ◽  
Hcl Solution

Herein, the synthesis, characterization and corrosion inhibition effectiveness of two aromatic epoxy monomers (AEMs) in carbon steel corrosive dissolution in 1 M HCl solution was investigated using computational and experimental techniques.

EXPERIMENTAL STUDIES MULTI-SUPPORTED SHAFTING

2020 ◽  
Vol 5 ◽  
pp. 80-84
Author(s):  
M.E. BONDARENKO ◽  
R.N. POLYAKOV ◽  
I.V. RODICHEVA ◽  
M.A. GRIADYNOVA
Keyword(s):  
Dynamic Characteristics ◽  
Experimental Studies ◽  
Measuring System ◽  
Experimental Setup ◽  
Experimental Equipment ◽  
Software Complex ◽  
Rotor Systems ◽  
Information Measuring System ◽  
Generating Equipment ◽  
Power Generating Equipment

The article presents an analysis of various types of experimental equipment that simulates the operation of flexible shaft lines of power generating machines and units. Based on the analysis results, an experimental setup is presented for investigating the dynamic characteristics of multi-support rotor systems. An information-measuring system is proposed to ensure the operation of a dynamic stand based on a hardware-software complex of the "National Instruments" company. The results of experimental studies of multi-support rotor systems used in power generating equipment are presented.

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