Autonomous Bridge detection based on ResNet for multiple damage types

2021 ◽  
Author(s):  
Guojin Tan ◽  
Zheng Yang
Keyword(s):  
Damage Types

Ageing Effects on Burst Pressure Test of Impacted Glass Fibre Reinforcement Epoxy (GRE) Pipes

2014 ◽  
Vol 695 ◽  
pp. 717-720 ◽  
Author(s):  
A. Hawa ◽  
Mohd Shukry Abdul Majid ◽  
Mohd Afendi ◽  
M. Haslan ◽  
Krishnan Pranesh ◽  
...  
Keyword(s):  
Energy Levels ◽  
Testing Machine ◽  
Filament Winding ◽  
Impact Testing ◽  
Burst Pressure ◽  
Fibre Reinforcement ◽  
Pressure Test ◽  
Leakage Failure ◽  
Composite Pipes ◽  
Damage Types

The main objective of this experimental study is to investigate the effects of hydrothermal ageing on the pressure bearing capacity of the E-glass/epoxy composite pipes subjected to impact loadings. The pipes were produced by the conventional filament winding technique comprises of six antisymmetric layers with (±55°)3 winding angles. The pipes were immersed in tab water for period of 500, 1000, and 1500 hours. The specimens were impacted at three different energy levels; 5 J, 7.5 J, and 10 J using an instrumented drop weight impact testing machine (IMATEK IM10). The samples were then subjected to pressure test until distinct leakage failure is observed. The results indicates that peak force and contact time increase with increasing impact energy. The tests results show that the burst pressure decreases with increase in energy levels during impact loading. During the burst tests, several damage types named leakage and eruption were observed.

scholarly journals A Fault-Signal-Based Generalizing Remaining Useful Life Prognostics Method for Wheel Hub Bearings

2019 ◽  
Vol 9 (6) ◽  
pp. 1080 ◽  
Author(s):  
Shixi Tang ◽  
Jinan Gu ◽  
Keming Tang ◽  
Rong Zou ◽  
Xiaohong Sun ◽  
...  
Keyword(s):  
Fatigue Damage ◽  
Remaining Useful Life ◽  
Working Environment ◽  
Short Term ◽  
Signal Model ◽  
Useful Life ◽  
Simplified Solution ◽  
Damage Type ◽  
Damage Types

The goal of this work is to improve the generalization of remaining useful life (RUL) prognostics for wheel hub bearings. The traditional life prognostics methods assume that the data used in RUL prognostics is composed of one specific fatigue damage type, the data used in RUL prognostics is accurate, and the RUL prognostics are conducted in the short term. Due to which, a generalizing RUL prognostics method is designed based on fault signal data. Firstly, the fault signal model is designed with the signal in a complex and mutative environment. Then, the generalizing RUL prognostics method is designed based on the fault signal model. Lastly, the simplified solution of the generalizing RUL prognostics method is deduced. The experimental results show that the proposed method gained good accuracies for RUL prognostics for all the amplitude, energy, and kurtosis features with fatigue damage types. The proposed method can process inaccurate fault signals with different kinds of noise in the actual working environment, and it can be conducted in the long term. Therefore, the RUL prognostics method has a good generalization.

API 579: A Comprehensive Fitness-for-Service Standard

2003 ◽  
Author(s):  
David A. Osage
Keyword(s):  
Driving Force ◽  
Petrochemical Industry ◽  
Assessment Methodology ◽  
Remaining Life ◽  
Future Directions ◽  
Damage Mechanisms ◽  
Assessment Procedures ◽  
The Relationship ◽  
Damage Types ◽  
Service Inspection

An overview of API 579 Recommended Practice For Fitness-For-Service [1] is presented in this paper. This document was initially released in January of 2000 and since that time has become the de facto international fitness-for-service standard for the refining and petrochemical industry. Insights into the driving force to create API 579 and the activities of an MPC Joint Industry Project to initiate development of the new FFS technologies included in this publication are discussed. A detailed overview of API 579 is then given that covers applicability of the FFS assessment procedures, overall organization, the general assessment methodology used for all flaw and damage types, options for different assessment levels, remaining life and rerating issues, and the relationship with other existing FFS codes and standards. A discussion of the changes planned for the next release of API 579, efforts to validate the fitness-for-service technology incorporated in API 579, and a discussion of a new API document pertaining to damage mechanisms and the relationship to a fitness-for-service assessment are provided. Plans for a joint API and ASME standard and future directions of the API in-service inspection codes relative to API 579 and equipment integrity are also covered.

J0420203 Identification of Damage Types in CFRP Laminates From AE Signals Detected by a New Optical Fiber Sensor

2014 ◽  
Vol 2014 (0) ◽  
pp. _J0420203--_J0420203-
Author(s):  
Fengming YU ◽  
Yoji OKABE ◽  
Qi WU ◽  
Satoshi KOBAYASHI ◽  
Kazuya SAITO
Keyword(s):  
Optical Fiber ◽  
Optical Fiber Sensor ◽  
Fiber Sensor ◽  
Cfrp Laminates ◽  
Damage Types ◽  
Ae Signals

scholarly journals The damage profile of kerai payung (Filicium desipiens) in University of Sumatera Utara green space based on Forest Health Monitoring (FHM) method

2021 ◽  
Vol 918 (1) ◽  
pp. 012019
Author(s):  
A Susilowati ◽  
A G Ahmad ◽  
H Siburian ◽  
A H Iswanto ◽  
H H Rachmat ◽  
...  
Keyword(s):  
Health Monitoring ◽  
Green Space ◽  
Forest Health ◽  
Air Pollutant ◽  
Environmental Benefits ◽  
Forest Health Monitoring ◽  
Dead Branch ◽  
Diameter Structure ◽  
The University ◽  
Damage Types

Abstract The University of Sumatera Utara (USU) campus in Medan is a green space area with numerous social and environmental benefits. In the USU campus, trees were planted for providing inhabitant needs such as fresh air, pollutant absorber, medicine, wood, fuel, fiber, aesthetic, and food. One of the medicine, wood, and aesthetic species that grows on the USU campus is kerai payung (Filicium decipiens). Along with fallen trees and broken branches incidents, detection of kerai payung trees damage in the campus USU was needed to prevent undesirable incidents and provide recommendations for maintenance. This research aims to get information on the distribution and damage profile of Kerai payung. To determine and assess the damage profile, the Forest Health Monitoring (FHM) approach was used. Research showed that the Kere payung diameter structure ranges from 8 cm to 74 cm. Based on FHM, damage types of Kerai payung trees in USU campus are as follows; broken or dead branch, open wound, brum in branch, loss of dominant tips, leaves change color and konk. While the damage location is found in branches, buds and tips, lower and upper bole, leaves and upper bole. Our research pointed out that maintaining activities still be needed to avoid further damages.

scholarly journals CURRENT OPPORTUNITIES FOR A COMPREHENSIVE RESEARCH OF DAMAGES ON FIBER STRUCTURE MATERIALS

2018 ◽  
Vol 18 ◽  
pp. 324-332
Author(s):  
T. Ye. Balynian ◽  
L. M. Derechа
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Damage Mechanism ◽  
Experimental Investigations ◽  
Fibrous Materials ◽  
Photographic Evidence ◽  
Damage Type ◽  
Damage Types ◽  
Illustrative Material ◽  
Scanning Electron

Among main issues to be resolved while forensic examination of fibrous materials is the questions of detecting a mechanism of their damage formation. Examinations on detecting a materials damage mechanism are often appointed while crime investigations of various categories. At the same time, a damage differentiation, detecting the mechanism of their creation is difficult and problematic. Successful solve a number of tasks of forensic science the implementation of modern instrumental techniques application, among which scanning electron microscopy takes a relevant place that makes possible to directly observe the microstructure features of textile fibers, to make photographic evidence and to use photographs as illustrative material in expert conclusions. For performing research, materials were collected and experiments were performed to reproduce various mechanical, chemical, thermal and biological damages. While performing research using scanning electron microscopy, features of the structure and microrelief of the surface of the ends of fibers were revealed. While detecting damage type in default of damage instruments a expert should compare signs established of investigated damage with known signs typical for various kinds of damage and to reach a conclusion about possible type of used instrument for investigated damage. Performing complexes of experimental investigations of various damage types of different fibrous materials enables differentiation of chemical, mechanical, thermal and biological damages, detection of micromarks that individualize the object (factor) of action, increase of the potential for obtaining trace information about actual data and circumstances of the event in cases where it is impossible to diagnose the damage by external morphological features. Results of performed researches are positive for the creation of the methods of microscopic investigations regarding materials damage of fibrous nature in order to perform diagnostic and identification tasks.

scholarly journals Diabetic cervicobrachial radiculoplexopathy

2019 ◽  
Vol 11 (4) ◽  
pp. 160-165
Author(s):  
L. T. Akhmedzhanova ◽  
A. I. Isaikin ◽  
O. A. Chernenko ◽  
Yu. M. Shor ◽  
D. M. Merkulova ◽  
...  
Keyword(s):  
Diabetes Mellitus ◽  
Nervous System ◽  
Peripheral Nervous System ◽  
Clinical Features ◽  
Lipoic Acid ◽  
Clinical Case ◽  
Clinical Symptoms ◽  
Alpha Lipoic Acid ◽  
First Time ◽  
Damage Types

Peripheral nervous system (PNS) damage is one of the most common complications of diabetes mellitus. There may be different PNS damage types that differ in clinical symptoms and pathogenesis. A clinical case of diabetic cervicobrachial radiculoplexopathy is presented for the first time in Russia. The paper discusses the clinical features of this type versus diabetic lumbosacral radiculoplexopathy, instrumental diagnosis of diabetic radiculoplexopathies, pathogenetic mechanisms of the disease, and treatment approaches. It shows the efficacy of alpha-lipoic acid supplementation in a patient with diabetic radiculoplexopathy.

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