scholarly journals Measurement and analysis of vibrations - evaluation of the criteria of acceptance ISO Standard 10816-6

2020 ◽  
Vol 13 (26) ◽  
pp. 39-44
Author(s):  
Roger Arevalo Gomez
Keyword(s):  
Composite Material ◽  
Building Material ◽  
Vibration Measurement ◽  
Acceptance Criteria ◽  
Iso Standard ◽  
Ship Building ◽  
International Standard ◽  
Measurement And Analysis ◽  
Ship Vibration

During the reception and / or delivery tests of a ship, vibration measurement and analysis is made to the propulsion line in order to evaluate and predict the condition of the machinery. The values taken during the measurement of the vibrations are evaluated with the acceptance criteria provided by the standards. International Standard ISO 10816-6 (1995) focuses on reciprocating machinery with power of greater than 100kW, is used by both analysts and manufacturers of propulsion machinery for ships. Through this work, we intend to evaluate the acceptance criteria of this norm in boats smaller than 100 meters. At the end of this work it is concluded that the standard must be updated, indicating and differentiating the acceptance criteria for machinery taking into account its type of anchorage to the structure (flexible or rigid), boats with length less than or greater than 100 meters and the Ship building material (Aluminum, Steel or Composite material).

scholarly journals COMPARATIVE STUDY OF STRESSES AND STRAINS THAT OCCUR IN STRUCTURAL ELEMENTS MADE OF COMPOSITE MATERIALS CONSIDERING THE MODEL WITH AND WITHOUT LAYERS

2016 ◽  
Vol 18 (4) ◽  
Author(s):  
FLORENTINA TOCU ◽  
COSTEL IULIAN MOCANU
Keyword(s):  
Mechanical Properties ◽  
Composite Material ◽  
Mechanical Characteristics ◽  
Building Industry ◽  
Careful Study ◽  
Structural Elements ◽  
Ship Building ◽  
Isotropic Plates ◽  
Layer Composite ◽  
Collective Experience

<p>Fibreglass-reinforced polyester (GRP) is the most widely used composite material in the ship building industry and requires careful study in point of mechanical characteristics. This article presents the collective experience related to behaviour in different situations of GRP loading. We considered three cases manufacturing for GRP: layers with mechanical characteristics for each layer, composite (the material is considered isotropic but with layers and same mechanical properties for all layers), and isotropic plates.</p>

Judgment of Defective Gear by Vibration Measurement and Analysis

2005 ◽  
Author(s):  
Kazuhiko Morimoto ◽  
Nobuyuki Okubo ◽  
Takeshi Toi ◽  
Tsuyoshi Okumura
Keyword(s):  
Vibration Measurement ◽  
Measurement And Analysis

An International Standard (ISO) for GRP Pipelines and Piping Systems

2001 ◽  
Author(s):  
Simon R. Frost
Keyword(s):  
System Design ◽  
Oil And Gas ◽  
Work Group ◽  
Health And Safety ◽  
Oil And Gas Industry ◽  
Local Health ◽  
Iso Standard ◽  
Technical Data ◽  
International Standard ◽  
Piping Systems

Abstract Over the last few years the number of standards relating to the use and implementation of GRP pipelines and piping systems has dramatically proliferated. A working group under ISO TC 67 was formed in an attempt to produce a single international standard with the aim to amalgamate and harmonise the many country wide standards. Standards that were considered in this amalgamation included ASTM F 1173, API 15 HR, BS 7159, ASME B31.3 and the Shell DEP. The work group consisted of members from the oil and gas industry, suppliers and local Health and Safety Executives. The basis of the document was the old UKOOA specification for the GRP for off-shore systems. The scope of the this new ISO standard was broadened in terms of both application and service conditions. The new ISO standard comprises 4 sections, scope, qualification, system design and installation/operation. The key points of the sections are; Qualification procedures are performance based, i.e. the emphasis is on suppliers to demonstrate performance. Care was taken with this new standard to minimise the test burden without compromising on technical rigour. System design procedures were defined which balanced existing design practices and experience with the limited amount of technical data. Installation and operational procedures were selected to enhance the use of GRP in many applications. Typical damage mechanisms and defects that could possibly occur were documented with recommendations made of relevant inspection techniques and repair options. The issue date for this ISO standard is mid 2001.

scholarly journals The cubic regression model of thermal estimation in the flammability test of the fibrous compound used in bus bodies

2019 ◽  
Vol 264 ◽  
pp. 02004
Author(s):  
Cristian Pérez-Salinas ◽  
Christian Castro ◽  
Roberto Valencia
Keyword(s):  
Composite Material ◽  
Regression Model ◽  
Thermal Behavior ◽  
Regression Models ◽  
Fire Behavior ◽  
Regression Coefficients ◽  
Automotive Applications ◽  
Iso Standard ◽  
Flammability Test ◽  
Best Fit

The fire behavior of fiber compounds is a serious concern in automotive applications. The objective of the proposed work is to predict thermal behavior during flammability testing of the composite material of polymer matrix reinforced with fiberglass used in the interior lining of bodies. Different regression models were performed to determine the best fit. This regression analysis determines the existing correlation between the acquired parameters of burn time and temperature versus two types of fibers used for the interior decorative lining. Different regression coefficients were determined and used for the prediction. Through the best fit regression model, thermal behavior of burning during the flammability test is predicted under ISO standard 3795: 1989 and FMVSS 302. The prediction was made for two types of composites, Roof Fiber, FT, and Fiber for laterals, FL. The cubic regression model showed the best prediction fit with a Rq of 0.79 for FT and 0.81 for FL.

Measurement and Analysis of Shipboard Vibrations

1998 ◽  
Vol 35 (01) ◽  
pp. 1-9
Author(s):  
DeBord Frank ◽  
Hennessy William ◽  
McDonald Joseph
Keyword(s):  
Measurement System ◽  
Vibration Response ◽  
Vibration Measurement ◽  
Ship Construction ◽  
Vibration Data ◽  
Construction Specifications ◽  
Analysis Methods ◽  
Measurement And Analysis ◽  
Potential Problems ◽  
Maintenance Requirements

Excessive shipboard vibrations can cause structural and machinery failures, crew discomfort and fatigue, and increased maintenance requirements for shipboard systems. In many cases ship construction specifications require the shipyard to demonstrate "acceptable " levels of vibration using measurements completed during sea trials. This paper provides an overview of standards for these measurements and modern techniques used to collect and analyze the specified vibration data. A brief discussion of the types of vibrations found on ships and their causes is followed by a review of codes, guides and standards for vibration measurement. Instrumentation suitable for measurement of each type of vibration response is described and the design of a typical trial measurement system is presented. Techniques for analyzing and presenting trial results are reviewed and compared with analysis methods specified by SNAME, ISO and NAVSEA. Finally, a discussion of potential problems faced by an owner and shipyard in developing and meeting a vibration measurement specification is offered.

Wavelet Analysis of Vibration: Part 1—Theory

1994 ◽  
Vol 116 (4) ◽  
pp. 409-416 ◽  
Author(s):  
D. E. Newland
Keyword(s):  
Signal Analysis ◽  
Spectral Composition ◽  
Vibration Measurement ◽  
Harmonic Wavelets ◽  
Time Frequency ◽  
Orthogonal Wavelets ◽  
Vibration Data ◽  
Measurement And Analysis ◽  
Frequency Map ◽  
Selection Of

Wavelets provide a new tool for the analysis of vibration records. They allow the changing spectral composition of a nonstationary signal to be measured and presented in the form of a time-frequency map. The purpose of this paper, which is Part 1 of a pair, is to introduce and review the theory of orthogonal wavelets and their application to signal analysis. It includes the theory of dilation wavelets, which have been developed over a period of about ten years, and of harmonic wavelets which have been proposed recently by the author. Part II is about presenting the results on wavelet maps and gives a selection of examples. The papers will interest those who work in the field of vibration measurement and analysis and who are in positions where it is necessary to understand and interpret vibration data.

COMPLEX DIELECTRIC PERMITTIVITY IN ROCKS: A METHOD FOR ITS MEASUREMENT AND ANALYSIS

Geophysics ◽  
1973 ◽  
Vol 38 (5) ◽  
pp. 920-940 ◽  
Author(s):  
Román Alvarez
Keyword(s):  
Composite Material ◽  
Dielectric Permittivity ◽  
Electrode System ◽  
Imaginary Component ◽  
Charge Accumulation ◽  
Electrical Measurements ◽  
Rock Samples ◽  
Measurement And Analysis ◽  
Effective Dielectric Permittivity ◽  
Method Of Measurement

The interfacial effects arising in electrical measurements of rocks, when a two‐electrode system is used, are analyzed via the Maxwell‐Wagner effect. The similarity in electrical behavior between rock samples and heterogeneous dielectrics with nonnegligible ohmic conductivities leads to a general analysis of the Maxwell‐Wagner effect. We conclude that, in general, it is necessary to have volume charge accumulations at interfaces within the sample and at the electrode‐sample interface in order to have electrical steady‐state conditions in rock samples. The expression for the charge accumulation at the interface as a function of frequency is obtained as well as expressions for the effective dielectric permittivity in a composite material; the relaxation time associated with the charge accumulation and that of the effective dielectric permittivity are the same. Given a sample consisting of two different materials, it is shown that whenever both components have nonnegligible ohmic conductivities, the imaginary component of the effective dielectric permittivity tends to infinity when the frequency tends to zero; such behavior is not observed when one of the two conductivities is negligible. This fact constitutes the basis of the method of measurement for heterogeneous dielectrics with nonnegligible ohmic conductivities proposed herein. The method consists essentially of utilizing a dielectric with negligible ohmic and dielectric conductivities as one of the two components of the sample, which isolates the other one from the electrodes. Theoretical examples of the behavior of such a composite material for various cases are analyzed and three experimental examples are presented. The method presents the advantage of permitting application of theory developed for dielectrics in general.

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