Wireless operational modal analysis of a multi-span prestressed concrete bridge for structural identification

Whelan, Matthew J.,Gangone, Michael V.,Janoyan, Kerop D.,Hoult, Neil A.,Middleton, Campbell R.,Soga, Kenichi Techno-Press 2010 Smart Structures and Systems, An International Jou Vol.6 No.5

Low-power radio frequency (RF) chip transceiver technology and the associated structural health monitoring platforms have matured recently to enable high-rate, lossless transmission of measurement data across large-scale sensor networks. The intrinsic value of these advanced capabilities is the allowance for high-quality, rapid operational modal analysis of in-service structures using distributed accelerometers to experimentally characterize the dynamic response. From the analysis afforded through these dynamic data sets, structural identification techniques can then be utilized to develop a well calibrated finite element (FE) model of the structure for baseline development, extended analytical structural evaluation, and load response assessment. This paper presents a case study in which operational modal analysis is performed on a three-span prestressed reinforced concrete bridge using a wireless sensor network. The low-power wireless platform deployed supported a high-rate, lossless transmission protocol enabling real-time remote acquisition of the vibration response as recorded by twenty-nine accelerometers at a 256 Sps sampling rate. Several instrumentation layouts were utilized to assess the global multi-span response using a stationary sensor array as well as the spatially refined response of a single span using roving sensors and reference-based techniques. Subsequent structural identification using FE modeling and iterative updating through comparison with the experimental analysis is then documented to demonstrate the inherent value in dynamic response measurement across structural systems using high-rate wireless sensor networks.

Determination of anthelmintic drug residues in milk using ultra high performance liquid chromatography-tandem mass spectrometry with rapid polarity switching

Whelan, M.,Kinsella, B.,Furey, A.,Moloney, M.,Cantwell, H.,Lehotay, S.J.,Danaher, M. Elsevier 2010 Journal of chromatography Vol.1217 No.27

A new UHPLC-MS/MS (ultra high performance liquid chromatography coupled to tandem mass spectrometry) method was developed and validated to detect 38 anthelmintic drug residues, consisting of benzimidazoles, avermectins and flukicides. A modified QuEChERS-type extraction method was developed with an added concentration step to detect most of the analytes at <1μgkg<SUP>-1</SUP> levels in milk. Anthelmintic residues were extracted into acetonitrile using magnesium sulphate and sodium chloride to induce liquid-liquid partitioning followed by dispersive solid phase extraction for cleanup. The extract was concentrated into dimethyl sulphoxide, which was used as a keeper to ensure analytes remain in solution. Using rapid polarity switching in electrospray ionisation, a single injection was capable of detecting both positively and negatively charged ions in a 13min run time. The method was validated at two levels: the unapproved use level and at the maximum residue level (MRL) according to Commission Decision (CD) 2002/657/EC criteria. The decision limit (CCα) of the method was in the range of 0.14-1.9 and 11-123μgkg<SUP>-1</SUP> for drugs validated at unapproved and MRL levels, respectively. The performance of the method was successfully verified for benzimidazoles and levamisole by participating in a proficiency study.

NatureWorks Biopolymer - Market Traction & Challenges

Jason Whelan 한국고분자학회 2008 한국고분자학회 학술대회 연구논문 초록집 Vol.33 No.1

Wireless operational modal analysis of a multi-span prestressed concrete bridge for structural identification

Matthew J. Whelan,Michael V. Gangone,Kerop D. Janoyan,Neil A. Hoult,Campbell R. Middleton,Kenichi Soga 국제구조공학회 2010 Smart Structures and Systems, An International Jou Vol.6 No.5

Low-power radio frequency (RF) chip transceiver technology and the associated structural health monitoring platforms have matured recently to enable high-rate, lossless transmission of measurement data across large-scale sensor networks. The intrinsic value of these advanced capabilities is the allowance for high-quality, rapid operational modal analysis of in-service structures using distributed accelerometers to experimentally characterize the dynamic response. From the analysis afforded through these dynamic data sets, structural identification techniques can then be utilized to develop a well calibrated finite element (FE) model of the structure for baseline development, extended analytical structural evaluation, and load response assessment. This paper presents a case study in which operational modal analysis is performed on a three-span prestressed reinforced concrete bridge using a wireless sensor network. The low-power wireless platform deployed supported a high-rate, lossless transmission protocol enabling real-time remote acquisition of the vibration response as recorded by twenty-nine accelerometers at a 256 Sps sampling rate. Several instrumentation layouts were utilized to assess the global multi-span response using a stationary sensor array as well as the spatially refined response of a single span using roving sensors and reference-based techniques. Subsequent structural identification using FE modeling and iterative updating through comparison with the experimental analysis is then documented to demonstrate the inherent value in dynamic response measurement across structural systems using high-rate wireless sensor networks.

現 蘇聯 Baltic艦隊 上陸軍

Morhew J. Whelan,윤화섭 해군대학 1982 海洋戰略 Vol.- No.15

현재 소련은 발틱해 일대를 거의 지배하고 있다. 세계제2차대전 이후 소련은 Bothnia와 Finland만 입구의 제해권은 획득하였을 뿐 아니라, 그들의 국경선을 발틱해의 동해안 선을 따라 확장하여 왔다.

상하수처리 계획을 위한 BOT 도입 방안

(Brian J . Whelan),(Michael R . Norton),(Jonathan Clark) 한국수처리학회 1996 한국수처리학회지 Vol.4 No.4

Goverments have traditionally fulfilled their responsibilities for the provision of basic community needs by the financing and management of the infrastructure which provides it. In recent year, a new approach has been adopted for the provision of such facilities adopting the Build, Operate, transfer(BOT)concept. This paper describes, the BOT concept, typical structure and management of the process. It then deals with the essemtials of risk, the proper allocation of which is the key to successm and outline the application of BOT concepts to the implementation of Water/Wastwater Treatment Plants. Finally, it summarises the effestiveness of those undertaken to date and suggests lessons for the future.

Developing Electronic Maps on First-run and Doublefeature Cinemas in Seoul from 1976 to 1995

Youngsue Han,Hyunjung Roh,Whelan Thomas,Jisun Park,Jieun Kim 한국콘텐츠학회 2023 International Journal of Contents Vol.19 No.4

A Study to Optimize a Commerical Vehicle Fuel Consumption Using Vehicle Simulation

Myungseok Lyu,Steven Whelan,Ben Rogers 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.5_1

An approach to optimizing vehicle fuel economy is described based on a study of a commercial vehicle. The approach is based on using a V-SIM software vehicle simulation to identify the relative efficiency of each of the vehicle systems, such as the engine hardware, engine software calibration, transmission, cooling system and ancillary drives. The simulation based approach offers a detailed understanding of what vehicle systems are underperforming and by how much the vehicle fuel economy can be improved if those systems are brought up to best-in-class performance. In this way, the optimum vehicle fuel economy can be provided to the vehicle customer. A further benefit is that the simulation requires only a minimum of vehicle testing for initial validation, with all subsequent field test cycles performed in software, thereby reducing development time and cost for the manufacturer.

COMBUSTION INSTABILITIES AND NANOPARTICLES EMISSION FLUCTUATIONS IN GDI SPARK IGNITION ENGINE

A. E. HASSANEEN,S. SAMUEL,I. WHELAN 한국자동차공학회 2011 International journal of automotive technology Vol.12 No.6

The main challenge facing the concept of gasoline direct injection is the unfavourable physical conditions at which the premixed charge is prepared and burned. These conditions include the short time available for gasoline to be sprayed, evaporated, and homogeneously mixed with air. These conditions most probably affect the combustion process and the cycle-by-cycle variation and may be reflected in overall engine operation. The aim of this research is to analyze the combustion characteristics and cycle-by-cycle variation including engine-out nanoparticulates of a turbocharged, gasoline direct injected spark ignition (DISI) engine at a wide range of operating conditions. Gasoline DISI, turbo-intercooled, 1.6L, 4 cylinder engine has been used in the study. In-cylinder pressure has been measured using spark plug mounted piezoelectric transducer along with a PC based data acquisition. A single zone heat release model has been used to analyze the in-cylinder pressure data. The analysis of the combustion characteristics includes the flame development (0-10% burned mass fraction) and rapid burn (10-90% burned mass fraction) durations at different engine conditions. The cycle-by-cycle variations have been characterized by the coefficient of variations (COV) in the peak cylinder pressure, the indicated mean effective pressure (IMEP), burn durations, and particle number density. The combustion characteristics and cyclic variability of the DISI engine are compared with data from throttle body injected (TBI) engine and conclusions are developed.

Neural correlates of oddball detection in self-motion heading: a high-density event-related potential study of vestibular integration.

Nolan, H,Butler, J S,Whelan, R,Foxe, J J,B?lthoff, H H,Reilly, R B Springer-Verlag 2012 Experimental brain research Vol.219 No.1

<P>The perception of self-motion is a product of the integration of information from both visual and non-visual cues, to which the vestibular system is a central contributor. It is well documented that vestibular dysfunction leads to impaired movement and balance, dizziness and falls, and yet our knowledge of the neuronal processing of vestibular signals remains relatively sparse. In this study, high-density electroencephalographic recordings were deployed to investigate the neural processes associated with vestibular detection of changes in heading. To this end, a self-motion oddball paradigm was designed. Participants were translated linearly 7.8 cm on a motion platform using a one second motion profile, at a 45 angle leftward or rightward of straight ahead. These headings were presented with a stimulus probability of 80-20 %. Participants responded when they detected the infrequent direction change via button-press. Event-related potentials (ERPs) were calculated in response to the standard (80 %) and target (20 %) movement directions. Statistical parametric mapping showed that ERPs to standard and target movements differed significantly from 490 to 950 ms post-stimulus. Topographic analysis showed that this difference had a typical P3 topography. Individual participant bootstrap analysis revealed that 93.3 % of participants exhibited a clear P3 component. These results indicate that a perceived change in vestibular heading can readily elicit a P3 response, wholly similar to that evoked by oddball stimuli presented in other sensory modalities. This vestibular-evoked P3 response may provide a readily and robustly detectable objective measure for the evaluation of vestibular integrity in various disease models.</P>