Academic literature on the topic 'Technical Support (TS)'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Technical Support (TS).'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Journal articles on the topic "Technical Support (TS)"
1
Merkle, Larry, and Maureen Doyle. "SIGCSE TS 2022 report." ACM SIGCSE Bulletin 54, no. 2 (April 2022): 3–5. http://dx.doi.org/10.1145/3538522.3538525.
Full textAbstract:
The SIGCSE Technical Symposium is SIGCSE's flagship conference and this past March we held SIGCSE's 53nd technical symposium. SIGCSE TS 2022 was held March 3-5, 2022, in Providence, Rhode Island and online. Virtual attendees participated through the Pathable platform. SIGCSE TS 2022 was our first hybrid conference, and it opened with some trepidation about stepping into the unknown. However, our community showed patience and support through this adventure, and we thank you.
2
Weng, Cathy, and Erin Ackerman. "Towards Sustainable Partnership: Examining Cross Perceptions of Public and Technical Services Academic Librarians." Library Resources & Technical Services 61, no. 4 (October 9, 2017): 198. http://dx.doi.org/10.5860/lrts.61n4.198.
Full textAbstract:
Public services (PS) and technical services (TS) librarians play equally crucial roles in providing library services to meet user needs to support institutional goals. For PS and TS librarians to develop effective workplace collaborations, both groups must have a better understanding of the other side’s perspectives, values, and concerns. This paper sought to learn how librarians in the two areas currently perceive and/or stereotype each other. The authors conducted a survey on cross perceptions of public and technical services academic librarians. The study tested and confirmed assumptions that previous papers have made about the negative perceptions of TS librarians held by PS librarians. Analysis of survey results, however, found that TS respondents expected to be viewed more negatively than was evidenced by the PS responses. Nonetheless, both PS and TS respondents recognized and agreed on the important role that library technical services play within the larger context.
3
Zhang, Guofeng, Dehua Wu, Jingdun Jia, Wanlin Gao, Qiang Cai, Wan’ang Xiao, Lina Yu, Sha Tao, and Qi Chu. "Architecture Characteristics and Technical Trends of UHF RFID Temperature Sensor Chip." Active and Passive Electronic Components 2018 (October 1, 2018): 1–8. http://dx.doi.org/10.1155/2018/9343241.
Full textAbstract:
The integration of temperature sensor (TS) and UHF RFID technology has attracted wide attention theoretically and experimentally. The architecture, power consumption, temperature measurement range, accuracy, and communication distance are key indicators of the performance of UHF RFID temperature sensor chip (RID-TSC). This work aims to provide a clearer view of the development of UHF RFID-TSC integration technology. After a systematic analysis of the characteristics of ADC, TDC, and FDC used in an integrated TS, the key low-power technologies under different architectures are summarized. Through the observation of the latest researches and commercial products, the development trend of UHF RFID-TSC technology is obtained, including on-chip and off-chip coordination, multiprotocol and multifrequency support, passive wireless sensor intelligence, miniaturization, and concealment.
4
Gera, V., R. Mosyagin, E. Kalmykov, and V. Pudikov. "Methodology of adjusting the strategy of technical systems maintenance and repair according to the results of their operation." Journal of Physics: Conference Series 2131, no. 3 (December 1, 2021): 032105. http://dx.doi.org/10.1088/1742-6596/2131/3/032105.
Full textAbstract:
Abstract In the publication the authors solve the problem of forming the optimal volume of control actions to maintain the technical systems (TS) service availability. To achieve the desired result the analysis of the TS as a service object was carried out. As a result of the analysis the system elements with a level of reliability below the required level are assigned to a separate group for which the maintenance modes are formed later, their actual state being taken into account. Namely, the decision is made what work on these elements can perform and what forces and means of the technical support system will be required for their operation. To form a list of necessary operations, the functional scheme analysis of the TS considered is carried out, during the analysis the functional as well as degradation characteristics of the system elements are determined as well as the significance (weight) of each element in the system. The analysis of the functional scheme of the TS is performed by using the functional-topological method.
5
Lin, Hansheng, Paul-Emile Boileau, Yongjian Jiang, Maosheng Yan, and Bin Xiao. "Investigating the Relationship between Coupling Forces and Hand-Transmitted Vibration under Varying Excitation Levels." Vibration 5, no. 1 (February 28, 2022): 141–52. http://dx.doi.org/10.3390/vibration5010009.
Full textAbstract:
In this study, the vibration total value of the acceleration transmitted to the wrist and elbow was measured in the laboratory with a group of 13 male subjects holding a cylindrical handle while modifying the coupling force under varying levels of vibration. The results were used to establish the relationship between hand-transmitted vibration and coupling forces and to compare with the relations proposed as part of an ISO Technical Specification, ISO/TS 15230-2. This was done to determine the suitability of the proposed relationships when variations are introduced on the level of vibration on the handle. While tracing back the origins of the relations proposed in ISO/TS 15230-2, this paper further brings in evidence of the importance of considering the role of coupling forces when evaluating the exposure to hand-transmitted vibration and provides additional evidence to support the relationships which are proposed as part of the ISO Technical Specification. Irrespective of the level of broadband random vibration excitation considered, the agreement with these relationships was found to be best when setting the reference coupling force at 50, 75, 100 and 125 N and whenever the coupling forces applied on the handle were maintained below 150 N.
6
Xiaoling, Li. "Motor imagery-based EEG signals classification by combining temporal and spatial deep characteristics." International Journal of Intelligent Computing and Cybernetics 13, no. 4 (September 30, 2020): 437–53. http://dx.doi.org/10.1108/ijicc-07-2020-0077.
Full textAbstract:
PurposeIn order to improve the weak recognition accuracy and robustness of the classification algorithm for brain-computer interface (BCI), this paper proposed a novel classification algorithm for motor imagery based on temporal and spatial characteristics extracted by using convolutional neural networks (TS-CNN) model.Design/methodology/approachAccording to the proposed algorithm, a five-layer neural network model was constructed to classify the electroencephalogram (EEG) signals. Firstly, the author designed a motor imagery-based BCI experiment, and four subjects were recruited to participate in the experiment for the recording of EEG signals. Then, after the EEG signals were preprocessed, the temporal and spatial characteristics of EEG signals were extracted by longitudinal convolutional kernel and transverse convolutional kernels, respectively. Finally, the classification of motor imagery was completed by using two fully connected layers.FindingsTo validate the classification performance and efficiency of the proposed algorithm, the comparative experiments with the state-of-the-arts algorithms are applied to validate the proposed algorithm. Experimental results have shown that the proposed TS-CNN model has the best performance and efficiency in the classification of motor imagery, reflecting on the introduced accuracy, precision, recall, ROC curve and F-score indexes.Originality/valueThe proposed TS-CNN model accurately recognized the EEG signals for different tasks of motor imagery, and provided theoretical basis and technical support for the application of BCI control system in the field of rehabilitation exoskeleton.
7
Ramos, Delfina, and Luis Almeida. "Overview of Standards Related to the Occupational Risk and Safety of Nanotechnologies." Standards 2, no. 1 (March 1, 2022): 83–89. http://dx.doi.org/10.3390/standards2010007.
Full textAbstract:
Nanomaterials offer new technical and commercial opportunities but, due to their low particle size, raise occupational health and safety concerns and may also pose risks to the consumers and the environment. In the last 15 years, many standards have been developed in the area of nanotechnologies, taking into account, namely, occupational risk and safety. This paper presents an overview of the standards in this area, with special emphasis at the ISO level, but also at European level, where standards are considered as an important support for legislation. A brief presentation of five relevant ISO standards is included. Relevant European Standards are also mentioned. The control banding approach for occupational risk management applied to engineered nanomaterials, according to ISO/TS 12901-2:2014, is presented. Standards are essential for society and should, in fact, be considered an important tool for companies to support sustainable products and process innovation.
8
Nurtanto, Muhammad, Herminarto Sofyan, Pardjono Pardjono, and Suyitno Suyitno. "Development model for competency improvement and national vocational qualification support frames in Automotive technology." International Journal of Evaluation and Research in Education (IJERE) 9, no. 1 (March 1, 2020): 168. http://dx.doi.org/10.11591/ijere.v9i1.20447.
Full textAbstract:
BNSP technical competence gets high legality on the side of the industry, while not all test participants can acquire it. Until now, studies that discuss relevant competency test models on automotive engine technology are still limited, not specific or even non-existent. The objective of this research is to produce a Competency Test Model for Engine Tune Up-System Injection and determine the characteristics after the model is applied. The subject of development consists of assesses (vocational education graduates, workers and educators), experts, and assessors from related Professional Certification Institutions (LSP). Instrument validation was conducted through expert judgment and feasibility trials. Reliability tests were performed using alpha and interrater coefficient analysis. The results of the test analysis include (1) competency test model assessment using the CBA approach; (2) competency dimension elements in instruments development are in the form of TS, TMS, CMS, EMS, and JRES; and (3) the characteristics of competency assessment include equipment verification of adequacy, avoiding impartiality, meeting requirements, transparent and accounTable, and able to produce recommendations as "competent" and "non-competent". The obtained findings showed that the developed competency test model could be used as a reference for use in vocational education.
9
Huangfu, Wenchao, Weicheng Wu, Xiaoting Zhou, Ziyu Lin, Guiliang Zhang, Renxiang Chen, Yong Song, et al. "Landslide Geo-Hazard Risk Mapping Using Logistic Regression Modeling in Guixi, Jiangxi, China." Sustainability 13, no. 9 (April 25, 2021): 4830. http://dx.doi.org/10.3390/su13094830.
Full textAbstract:
Reliable prediction of landslide occurrence is important for hazard risk reduction and prevention. Taking Guixi in northeast Jiangxi as an example, this research aimed to conduct such a landslide risk assessment using a multiple logistic regression (MLR) algorithm. Field-investigated landslides and non-landslide sites were converted into polygons. We randomly generated 50,000 sampling points to intersect these polygons and the intersected points were divided into two parts, a training set (TS) and a validation set (VT) in a ratio of 7 to 3. Thirteen geo-environmental factors, including elevation, slope, and distance from roads were employed as hazard-causative factors, which were intersected by the TS to create the random point (RP)-based dataset. The next step was to compute the certainty factor (CF) of each factor to constitute a CF-based dataset. MLR was applied to the two datasets for landslide risk modeling. The probability of landslides was then calculated in each pixel, and risk maps were produced. The overall accuracy of these two models versus VS was 91.5% and 90.4% with a Kappa coefficient of 0.814 and 0.782, respectively. The RP-based MLR modeling achieved more reliable predictions and its risk map seems more plausible for providing technical support for implementing disaster prevention measures in Guixi.
10
Mulyono, Hilman Auzan, Khoirul Anwar, and Budi Prasetya. "ON THE DESIGN OF BCH CODES POLYNOMIALS FOR DIGITAL TELEVISION DVB-T2 BROADCASTING SYSTEMS." Journal of Measurements, Electronics, Communications, and Systems 6, no. 1 (June 30, 2020): 20. http://dx.doi.org/10.25124/jmecs.v6i1.2828.
Full textAbstract:
Digital Video Broadcasting Terrestrial{Second Generation (DVB-T2) requires a high coding rate to transmit data of high-quality video. This paper evaluates Bose-Chaudhuri-Hocquenghem (BCH) codes for the DVB-T2 to measure the gain of BCH codes. This paper evaluates the BCH codes as outer coding to be combined with other different inner encoding schemes such as Low Density Parity Check (LDPC) codes and convolutional codes to measure the best suitable inner encoding scheme. This paper also studies the performances of BCH codes for DVB-T2 specified by two different standards, i.e., (a) The European Telecommunications Standards Institute (ETSI) Technical Specification (TS) 102 831 and (b) ETSI European Standard (EN) 302 755. To obtain better error correcting capability, we propose new BCH polynomials based on the general guideline from ETSI TS 102 831 for Galois Field GF(214). We perform computer simulations to evaluate bit-error-rate (BER) performances under additive white Gaussian noise (AWGN) channel and Indonesia DVB-T2 channel model. We revealed the superiority of BCH codes in high data rate transmission, which is required for DVB-T2, and found that BCH codes are better suited to the LDPC codes as inner encoding rather than to the convolutional codes. We also confirmed that BCH codes of DVB-T2 from ETSI TS 102 831 using the proposed BCH polynomials have better performances compared to the standard polynomial of ETSI EN 302 755. We are expecting that the obtained polynomials can be adopted by the BCH codes of Indonesia DVB-T2 system. These results are expected to support the Indonesian government in determining the parameters of the BCH codes of DVB-T2 for Indonesia.
Dissertations / Theses on the topic "Technical Support (TS)"
1
Nou, Leakhena. "Stress, social support, coping, and psychological adjustment of Khmer university, college, and technical students in modern day Cambodia a sociological study /." 2002. http://proquest.umi.com/pqdweb?index=0&did=727406901&SrchMode=1&sid=3&Fmt=2&VInst=PROD&VType=PQD&RQT=309&VName=PQD&TS=1179198048&clientId=23440.
Full textBook chapters on the topic "Technical Support (TS)"
1
Ulrich, Hannes, Ann-Kristin Kock-Schoppenhauer, Cora Drenkhahn, Matthias Löbe, and Josef Ingenerf. "Analysis of ISO/TS 21526 Towards the Extension of a Standardized Query API." In Studies in Health Technology and Informatics. IOS Press, 2020. http://dx.doi.org/10.3233/shti200723.
Full textAbstract:
Metadata is often used for different tasks in the field of medical informatics: semantic description of data, quality validation, data integration, or information retrieval. Metadata definitions are captured and curated in time-consuming tasks and stored in metadata repositories that manage and preserve the metadata. Due to technical and legal restrictions, metadata is rarely as easily accessible and interoperable as it is necessary for modern information systems. In a previous study, a uniform interface based on the widely used ISO/IEC 11179 and the Facebook data retrieval language GraphQL was introduced as a solution to these technical obstacles. In the meantime, the ISO standard 21526 has been published, a recent version designed with a strong focus on health informatics. While it is conceptually oriented on the metamodel in ISO 11179, a number of extensions but also restructurings have been introduced. In this study, the authors investigated the difference between ISO 11179 and ISO 21526 and extended the unified metadata query interface to be future-proof and in particular, to support the semantic extensions of ISO 21526.
2
Sagara, Takamasa, Hiroaki Tsuruta, Yumika Fukuoka, Saori Tanaka, and Naotoshi Nakashima. "Viologen monolayers: Dynamics on electrode surfaces**This work was made as the research project of “Organization and Function”, PRESTO, JST but was additionally supported financially in part by a Grant-in-Aid for Scientific Research from the Ministry of Education, Science, Culture and Sports of Japan (to TS) and Asahi Glass Foundation (to TS). We thank Mr. Yi Yuan for his technical assistance." In Studies in Surface Science and Catalysis, 841–44. Elsevier, 2001. http://dx.doi.org/10.1016/s0167-2991(01)82217-5.
Full textConference papers on the topic "Technical Support (TS)"
1
Chen, Xin, and David Michelson. "Setting Technical Requirements for Intra-Ship Maritime Communication Services Over 3GPP Systems." In SNAME 14th International Marine Design Conference. SNAME, 2022. http://dx.doi.org/10.5957/imdc-2022-280.
Full textAbstract:
The first 3GPP Technical Specification covering service requirements (Stage 1) for the support of maritime communication (MARCOM) over 3GPP systems (TS 22.119) was approved in December 2018 at the TSG SA Plenary meeting in Sorrento. It represents one of several 3GPP initiatives that aim to ensure that future 3GPP/5G systems meet the needs and requirements of a variety of vertical domains and result in a unified communication platform for a broad set of industrial applications. In particular, TS 22.119 has the potential to support both a new wave of Global Maritime Distress and Safety System (GMDSS) modernization and broader 5G maritime services. Despite efforts by 3GPP to engage IALA, IMO, and other groups within the maritime community, much work remains in realising the full potential of this effort. One of the strengths of the 3GPP approach is the manner in which common requirements are re-used by different groups. To this end, wherever possible, the groups will take existing service requirements from 3GPP Stage 1 specifications. Maritime is a good example of this principle, with more general Mission Critical needs covered in other specifications, allowing TS 22.119 to be the deliverable that identifies only specific maritime needs including the service requirements for the support of autonomous shipping and the broader digitalization and mobilization of maritime shipping. Here, we propose a framework that will help to reveal new and emerging wireless system requirements for 3GPP systems in shipboard environments. In the first phase, we consider a current ship within which current wireless technology is deployed. Such scenarios are characterized by a limited set of use cases, a brute-force approach to design and deployment, a disconnect between the reference environments for which the wireless technology was developed, and the new operating environment. The result is suboptimal performance with glaring deficiencies. To a large extent, this is where we are today as technologies such as Wi-Fi, ZigBee, and Bluetooth are deployed aboard ship. In the second phase, airlink and radio resource management are modified to meet the needs of the new operating environment. Different service level requirements are identified, and more ambitious applications are deployed. At this stage, the primary impact is on shipboard operations with relatively little impact on ship design. To a large extent, this reflects the majority of current forward looking thinking concerning the application of wireless technology aboard ship today. In the third phase, ship design & construction are modified, subtly or otherwise, to account for both the nature of wireless propagation and the implications of the enhanced connectivity. In some cases, this may include lessons learned that allow crew sizes to be reduced, perhaps dramatically, in light of significant increases in the depth and sophistication of shipboard automation. We believe that this approach is well suited to bridging the gaps between wireless developers, naval architects, and standards developers, and contribute to the long-term success of efforts such as TS 22.119.
2
Koenig, Daniel T. "The Role of the Engineer in 21st Century Industry." In ASME 2001 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/imece2001/ts-23401.
Full textAbstract:
Abstract 1. What you think of as the traditional role of the engineer in Industry no longer exists. 2. Engineers no longer occupy purely technical positions. 3. There are more engineers in traditionally nontechnical positions than in structured Design, Mfg. Engineering, and R&D positions. 4. These facts are not discipline specific, but true across the board for all types of Engineering. 5. This means that how we prepare engineers for their first jobs and how we continue to learn, or as Dick Golstein says, how we engage in life long learning is undergoing radical change. 6. The fact is engineers in industry are pragmatic technically trained business persons, not technologists or scientist and we need to recognize that basic truth. 7. Now, with this as the state of the engineers position in industry, I’d like to discuss the changing nature of the strategy of operations that the engineer has to contend with and the education needs to support that strategy.
3
Lee, Jinwook, Vaishnavi Ramaswamy, Zoltán S. Spakovszky, Edward M. Greitzer, Mark Drela, and Jérôme Talbotec. "Effects of Surface Waviness on Fan Blade Boundary Layer Transition and Profile Loss — Part II: Experimental Assessments and Applications." In ASME Turbo Expo 2021: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/gt2021-58678.
Full textAbstract:
Abstract Part II describes the experimental assessment and the application of the ideas in Part I concerning the mechanisms that determine the role of blade surface waviness on laminar-turbulent transition and their consequent effect on civil aircraft fan performance. A natural transition wind tunnel was designed and constructed to characterize the impact of surface waviness on transition, using both hotwire anemometry and infrared thermography. The experimental results support the new hypothesis presented in Part I, concerning the way in which blade surface waviness affects fan performance through motion of the transition onset location due to interaction between surface waviness and Tollmien-Schlichting (TS) boundary layer instability. In particular, the theoretical amplification of the TS waves, and the corresponding transition onset location movement due to surface waviness, was borne out over a range of variations in Reynolds number, non-dimensional surface wavelength, non-dimensional surface wave height, and location of surface wave initiation, relevant to composite fan blade parameters. Further, the increase of receptivity coefficient, and thus the initial amplitude of disturbances due to geometric resonance between surface wavelength and TS wavelength, was also confirmed by the experiments. Surface waviness was estimated, in some cases, to result in a nearly 1% decrease in fan efficiency compared to a non-wavy blade. Suggestions are given for mitigation of the effects of waviness, including the idea of blade curvature rescheduling as a method to delay transition and thus decrease loss.
4
Laycock, Robert, and Thomas H. Fletcher. "Independent Effects of Surface and Gas Temperature on Coal Flyash Deposition in Gas Turbines at Temperatures Up to 1400°C." In ASME Turbo Expo 2015: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/gt2015-43575.
Full textAbstract:
Deposition of coal flyash in gas turbines has been studied to support the concept of integrated gasification combined cycle (IGCC). Although particle filters are used in IGCC, small amounts of ash particles less than 5 μm diameter enter the gas turbine. Previous deposition experiments in the literature have been conducted at temperatures up to about 1288°C. However, few tests have been conducted that reveal the independent effects of gas and surface temperature, and most have been conducted at gas temperatures lower than 1400°C. The independent effects of gas and surface temperature on particle deposition in a gas turbine environment were measured using the Turbine Accelerated Deposition Facility (TADF) at Brigham Young University. Gas temperatures were measured with a type K thermocouple and surface temperatures were measured with two-color pyrometry using the RGB signals from a camera. This facility was modified for testing at temperatures up to 1400°C. Subbituminous coal fly ash, with a mass mean diameter of 4 μm, was entrained in a hot gas flow at a Mach number of 0.25. A nickel base super alloy metal coupon 2.5 cm in diameter was held in this gas stream to simulate deposition in a gas turbine. The gas temperature (and hence particle temperature) governs the softening and viscosity of the particle, while the surface temperature governs the stickiness of the deposit. Two tests series were therefore conducted. The first series used backside cooling to hold the initial temperature of the deposition surface (Ts,i) constant at 1000°C while varying the gas temperature (Tg) from 1250°C – 1400°C. The second series held Tg constant at 1400°C while varying the initial Ts,i from 1050°C to 1200°C by varying the amount of backside cooling. Capture efficiency and surface roughness were calculated. Capture efficiency increased with increasing Tg. Capture efficiency also initially increased with Ts,i until a certain threshold temperature where capture efficiency began to decrease with increasing Ts,i.
5
Chemmakh, Abderraouf. "Machine Learning Predictive Models to Estimate the UCS and Tensile Strength of Rocks in Bakken Field." In SPE Annual Technical Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/208623-stu.
Full textAbstract:
Abstract Uniaxial Compressive Strength (UCS) and Tensile Strength (TS) are among the essential rock parameters required and determined for rock mechanical studies in Petroleum Engineering. However, the determination of such parameters requires some laboratory experiments, which may be time-consuming and costly at the same time. In order to estimate these parameters efficiently and in a short period, some mathematical tools have been used by different researchers. When regression tools proved to give good results only in the limited range of data used, machine learning methods proved to be very accurate in generating models that can cover a wide range of data. In this study, two machine learning models were used to predict the UCS and TS, Support Vector Regression optimized by Genetic Algorithm (GA-SVR) and Artificial Neural Networks (ANNs). The results were discussed for both uniaxial compressive strength and tensile strength in terms of coefficient of determination R2, root mean squared error (RMSE) and mean average error (MAE). First, for the case of UCS, values of 0.99 and 0.99, values of 3.41 and 2.9 and values of 2.43 and 1.9 were obtained for R2, RMSE and MAE for the ANN and GA-SVR, respectively. Second, for the TS, the same analogy was followed, a coefficient R2 of 0.99 and 0.99, RMSE values of 0.41 and 0.45 and MAE values of 0.30 and 0.39 were obtained for ANNs and GA-SVR, respectively. The next step was to assess these models on a different dataset consisting of data obtained from Bakken Field in Williston Basin, North Dakota, United States. The models showed excellent results comparing to the correlations they were compared with, outperforming them in terms of R2, RMSE and MAE, giving the following results for ANN and SVR respectively, R2 of 0.93, 0.92, RMSE of 9.54, 11.22 and MAE of 7.28, 9.24. The resultant conclusion of this work is that the use of machine learning algorithms can generate universal models which reduce the time and effort to estimate some complex parameters such as UCS and Tensile Strength.
6
Surovi, Nowrin Akter, Shaista Hussain, and Gim Song Soh. "A Study of Machine Learning Framework for Enabling Early Defect Detection in Wire Arc Additive Manufacturing Processes." In ASME 2022 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/detc2022-89164.
Full textAbstract:
Abstract This paper presents the study on the performance of a variety of proposed time-domain acoustic features-based frameworks for the detection of geometrically defective print segments during the Wire Arc Additive Manufacturing (WAAM) process. Specifically, we investigate into a variety of acoustic features, namely the Root Mean Square of Pressure (RMSP), Energy, Mean Amplitude, Kurtosis, Zero Crossing Rate (ZCR), Skewness, Crest Factor and Peak-to-peak, and print process parameters, namely Torch Speed (TS) and Wire Feed Rate (WFR) combined with Machine Learning (ML) frameworks for detecting geometrically defective print segments. Experiments carried out on Inconel 718 show that among the studied frameworks, using acoustic features and process parameters with Random Forest (RF) performs best in terms of F1 score at 89%, while using acoustic features and process parameters with Support Vector Machine (SVM) performs best in picking out defective segments based on the Confusion Matrix. These findings serve as our first step in developing an intelligent sensing system for the early identification of defective beads in the WAAM printing process, so that appropriate intervention can be implemented to save printing resources and material costs. In addition, the proposed approach has the advantage of detecting defects within a more localized region for more targeted intervention.
7
San Andrés, Luis, Wonbae Jung, and Seong-Ki Hong. "A Thermo-Hydrodynamic Model for Thermal Energy Flow Management in a (Semi) Floating Ring Bearing System for Automotive Turbochargers." In ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/gt2020-14332.
Full textAbstract:
Abstract Oil-engine lubricated turbochargers (TCs) operate at high temperature and must withstand large temperature gradients that produce severe thermo-mechanical stresses in the TC mechanical components. Thus, an insight into the thermal energy flows and an effective thermal management are paramount to ensure reliable TC operation. The paper analyzes the transport of energy and heat flows in semi-floating ring bearings (SFRBs) for automotive TCs with integrated heat and fluid flow models for both (turbine and compressor sides) radial bearings and thrust bearings to produce a complete thermo-hydrodynamic analysis predictive tool. The model couples the energy transport equations and the lubrication Reynolds equations in the inner and outer films of a SFRB and the adjacent thrust films to a three-dimensional heat conduction in the floating ring and along with thermal soaking into the TC casing. Cold lubricant, supplied at a specific temperature and pressure, flows to fill the films of the radial bearings, and then the thrust bearings. The lubricated bearings, radial and axial, support shaft loads, static and dynamic, and produce drag power losses. The streams of lubricant warm up as they take away a sizable portion of the heat flow from the hot shaft plus that due to viscous shear drag. Another fraction of thermal energy flow sinks into the floating ring which presents a distinct temperature field varying along the radial, circumferential and axial directions. The computational analysis contemplates a TC operating at shaft speeds (Ω) ranging from 30 krpm to 240 krpm (4 kHz) and a SFRB supplied with engine oil at PSUP = 3.0 bar and TSUP = 120 °C. The analysis focuses on a brass-made turbine bearing as it is the one that disposes most thermal energy flow since the shaft surface is hot at Ts = 213 °C (just below the lubricant flash point temperature at 230 °C) while the casing temperature is TC = TSUP. The ring with length/diameter = 1.6 has radial bearings with four equally spaced feed holes and four axial grooves, and the ratio outer film clearance/inner film clearance equals 5.3 at room temperature. As shaft speed increases (= 100 m/s max. surface speed), the inner film temperature increases proportionally; albeit the heat flow from the shaft into the inner film decreases while the viscous drag power raises rapidly. The outer film heats to just a few degrees above TSUP since the non-spinning ring does not generate viscous shear drag. The ring heats unevenly, radially with a ∼20 °C temperature gradient from its inner to outer diameters (ID and OD), and axially with up to a ∼50 °C difference from the thrust bearing side that also produces a drag power loss. At a low shaft speed (45 krpm), heat flowing from the shaft overwhelms the drag power loss induced by shearing the inner film; whereas as shaft speed increases (240 krpm), the contribution from the drag power loss to the total energy flow disposed increases significantly, from 3% to 63%. The lubricant flows, inner plus outer, advect most of the thermal energy flow, 74% to 81%, over the range of shaft speeds, low to high. The floating ring conducts a sizeable portion of thermal energy flow, 39% to 49% of the total, though varying little with shaft speed. Similarly does the fraction of heat, 9% to 13% of the total, conducted into the TC casing. A more conductive ring material or an outer film with a longer length conduct more heat into the ring although the lubricant flows still carry most of the thermal energy flow generated by viscous drag losses and heat from the shaft. The results demonstrate the importance of designing a SFRB system with adequate clearances and proper materials to offer an adequate thermal management and avoiding too high temperatures that could varnish, even flash and burn, the engine oil. The improvements in the energy transport and heat flow modeling of a SFRB system will produce significant savings in TC performance.
8
Xu, Anqi, Zhijian Zhang, HuaZhi Zhang, Min Zhang, He Wang, Yingfei Ma, Sijuan Chen, Yan Wang, and Gangyang Zheng. "Real-Time Online Risk Monitoring and Management Method for Maintenance Optimization in Nuclear Power Plant." In 2018 26th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/icone26-82472.
Full textAbstract:
As a nuclear power plant system configuration risk assessment tool, Risk Monitor (RM) can periodically update Living-PSA risk monitoring model to calculate risk information. It not only provides operating personnel with the real-time risk information, but also reduces human error in test and maintenance work, in order to ensure that the high-risk configurations are identified and controlled. Traditionally, the high-risk identification of planning activities is mainly based on technical specification (TS) and operating experience, etc. It is lack of quantitative risk assessment to support decision-making, especially when multiple systems or components are out of service or being restored. Planning risk assessment in existing risk monitors is time-consuming and error-prone, because they typically depend on manually screening and confirming risk-related planned events. Besides, online time-dependent characteristics of NPP systems are ignored. The reliability parameters are taken as constant values providing that components and systems always work under the predefined conditions. Thus, the risk level during planning period is not affected by the current configuration, or the operation history of equipment. With the widespread application of digital instrument control systems (I&C) in nuclear power plants, the technology of Real-time Online Risk Monitoring (RORM) was put forward. It improves the acquisition technique of current equipment status, modeling and updating technique of Living-PSA Model and provides more accurate, realistic prediction of risk level for planning configurations. This paper briefly introduces the design of the system structure, database, interfaces and functions of Real-time Online risk monitoring (RORM). It is characterized by the following features: online acquisition of the initial configuration before planning period, time-dependent risk monitoring modeling and updating in time. And it focuses how the real-time online risk monitoring technology of nuclear power plants help the nuclear power plant minimize the risk level of maintenance plan and optimize the maintenance schedule. Also, the calculation method of risk monitoring measures is improved based on the concept of “online, time-dependent”. Finally, the risk management method for optimization of planning activities is proposed.
9
Lee, Jinwook, Zoltán S. Spakovszky, Edward M. Greitzer, Mark Drela, and Jérôme Talbotec. "Effects of Surface Waviness on Fan Blade Boundary Layer Transition and Profile Loss — Part I: Methodology and Computational Results." In ASME Turbo Expo 2021: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/gt2021-58676.
Full textAbstract:
Abstract This two-part paper describes a new approach to determine the effect of surface waviness, arising from manufacture of composite fan blades, on transition onset location movement and hence fan profile losses. The approach includes analysis and computations of unsteady disturbances in boundary layers over a wavy surface, assessed and supported by wind tunnel measurements of these disturbances and the transition location. An integrated framework is developed for analysis of surface waviness effects on natural transition. The framework, referred to as the extended eN method, traces the evolution of disturbance energy transfer in flow over a wavy surface, from external acoustic noise through exponential growth of Tollmien-Schlichting (TS) waves, to the start and end of the transition process. The computational results show that surface waviness affects the transition onset location due to the interaction between the surface waviness and the TS boundary layer instability, and that the interaction is strongest when the geometric and TS wavelengths match. The condition at which this occurs, and the initial amplitude of the boundary layer disturbances that grow to create the transition onset is maximized, is called receptivity amplification. The results provide first-of-a-kind descriptions of the mechanism for the changes in transition onset location as well as quantitative calculations for the effects of surface waviness on fan performance due to changes in surface wavelength, surface wave amplitude, and the location at which the waviness is initiated on the fan blade.
10
Li, Xin, Yanli Shao, and Yusheng Liu. "Takagi-Sugeno Model Based Simulation Data Mining for Efficient Product Design." In ASME 2015 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/detc2015-47040.
Full textAbstract:
Simulation-driven design has become the mainstream design scheme. Generally, the designer have to design from scratch and repeat the design and analysis cycle until the design satisfies its expected objectives whenever faced new design requirements as the product development is an iterative process. Therefore, it is not an easy task for the designer to efficiently reuse the huge simulation data to improve the design process since what can be reused is the knowledge rather than the simulation data themselves. In this study, Takagi-Sugeno (TS) model based simulation data mining approach is proposed to uncover the intrinsic relationship between the key design parameters and global performance parameters in order to guide the design optimization with the aim to improve product design process. Firstly, an intermediate model which supports global prediction of the simulation results is proposed and its corresponding simulation results are computed based on the mapping and interpolation algorithm. Then the TS model is trained based on the identification algorithm and is further optimized to improve the prediction accuracy. Finally, the approach of TS model based simulation data mining is applied to the actual simulation data sets to demonstrate its feasibility and effectiveness. The experimental results show that the proposed approach can achieve great prediction accuracy on the global performance evaluation as well as local performance evaluation.