Academic literature on the topic 'Export demand scanning'
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Journal articles on the topic "Export demand scanning"
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Civi, Emin, Elif S. Persinger, and Aziz Sunje. "Gaining Strength For A New Future: Bosnia And Herzegovinas Export Opportunities." Journal of Diversity Management (JDM) 2, no. 4 (October 1, 2007): 43–60. http://dx.doi.org/10.19030/jdm.v2i4.5022.
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International trade is crucial for Bosnia and Herzegovinas (B&H) economic prosperity. In this study guidance to B&H exporters is provided by identifying potential markets and products to focus on when designing future trade strategies. To this end trends in the world trade and trade patterns are examined using various approaches.First approach to identify the potential markets for the B&H exports called for identifying the countries with highest general demand for Bosnia and Herzegovinas current export products. The products Bosnia and Herzegovina exports most along with the countries that demand these products the most in the world are identified. The second approach for identifying the potential export markets for B&H products examine the import volumes of other countries in the world. Still a more fruitful approach for the B&H exporters, at least in the short term, is to target the markets with the fastest growth of import volumes (the third approach). In the fourth approach, untapped trade and highly untapped trade countries that should be targeted by B&H exporters are presented. The fifth approach for identifying the potential export markets for B&H products is based on examining the products whose imports increased fastest in recent years and the countries that imported these products most.The products/product groups that have the highest potential for B&H export success are also identified. First, most imported products as well as the products/product groups whose exports increased the fastest in recent years are examined. Second, the import volumes ten countries with the highest total imports are examined on a product basis to identify the products they import most as well as the products with the highest growth rate of imports. Third, product categories with untapped trade potential and highly untapped trade potential along with their respective markets are presented.Long term sustainable success in the ever changing global economy requires a close and continuous scanning of the trends in the environment. The analysis approaches described above provide B&H exporters a starting point in evaluating their product and market selection strategies and designing new ones for the future.
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Rainieri, Giuseppe, Federico Fraboni, Gabriele Russo, Martin Tul, Andrea Pingitore, Alessia Tessari, and Luca Pietrantoni. "Visual Scanning Techniques and Mental Workload of Helicopter Pilots During Simulated Flight." Aerospace Medicine and Human Performance 92, no. 1 (January 1, 2021): 11–19. http://dx.doi.org/10.3357/amhp.5681.2021.
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INTRODUCTION: The visual scanning techniques used by helicopter pilots are a critical skill to accomplish safe and correct landing. According to the human information processing theory, visual scanning techniques can be analyzed as a function of fixation location, number, and duration of fixations.METHODS: This study assessed these techniques in expert and novice pilots during an open sea flight simulation in a low-workload condition, consisting of a daylight and good weather simulation, and in a high-workload condition of night-time, low visibility, and adverse weather conditions. Taking part in the study were 12 helicopter pilots. Mental workload was assessed through psychological measures (NASA-TLX). The pilots performance was assessed and eye movements were recorded using an eye-tracker during four phases of the flight simulations.RESULTS: Overall, pilots made more fixations out of the window (OTW; 22.54) than inside the cockpit (ITC; 11.08), Fixations were longer OTW (830.17 ms) than ITC (647.97 ms) and they were shorter in the low-demand condition (626.27 ms). Further, pilots reported higher mental workload (NASA-TLX) in the high-demand condition compared to the low-demand condition, regardless of their expertise, and expert pilots reported a lower mental workload compared to novice pilots.DISCUSSION: Pilots performance and perceived mental workload varied as a function of expertise and flight conditions. Pilots rely on instrument support during the cruise phase and external visual cues during the landing phase. The implications for a new visual landing system design are discussed.Rainieri G, Fraboni F, Russo G, Tul M, Pingitore A, Tessari A, Pietrantoni L. Visual scanning techniques and mental workload of helicopter pilots during simulated flight. Aerosp Med Hum Perform. 2021; 92(1):1119.
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Kim, Youngsook, Taiseok Chang, and Inchon Park. "Visual Scanning Behavior and Attention Strategies for Shooting Among Expert Versus Collegiate Korean Archers." Perceptual and Motor Skills 126, no. 3 (February 16, 2019): 530–45. http://dx.doi.org/10.1177/0031512519829624.
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This study analyzed differences in visual scanning behavior and resistance to distractions between Olympic and collegiate archers. The experiment required the participants to watch a test film comprising six stages corresponding to the phases of an archery performance. The recording emulated the archer's point of view. During initial phases of shooting, Olympic archers demonstrated more frequent and longer fixations than did their collegiate counterparts, whereas during the later phases of shooting, the groups' visual scanning patterns did not differ significantly. In a second experiment within this study, auditory and visual distractors led Olympic archers to exhibit fewer fixations of longer duration and less eye movement, regardless of the type of distraction. Thus, in each experiment, Korean national-team archers modified their attentional strategies more efficiently than collegiate archers, expanding and narrowing their focused attention based on task demands. These findings provide fundamental information on the nature of expert shooters' visual scanning patterns and have implications for developing training protocols for aspiring athletes.
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Chekina, Viktoriia. "Fiscal foresighting: analysis of researches." Economy of Industry 2, no. 94 (June 25, 2021): 71–107. http://dx.doi.org/10.15407/econindustry2021.02.071.
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In the context of the rapid technology development and globalization transformations, predicting changes in the economy, which affect fiscal system, is extremely relevant. Therefore, fiscal foresight as a mean of predicting a fiscal policy development in the long run is becoming an integral part of tax policy and economic development elaboration in many countries of the world. The objective of the paper is to analyse theoretical aspects of fiscal foresight, as well as foreign and national experience in fiscal foresights’ preparation to identify long-term factors and indicators that will have a significant impact (both positive and negative) on a fiscal system in a distant future. It was established that fiscal foresighting is a process of collecting data on the future to assess long-term prospects for the stability of tax revenues and budget expenditures in the face of changes in macroeconomic and other factors affecting the national economy. The main components of fiscal foresighting are identifying and monitoring trends, scanning and monitoring the time horizon, identifying risks and problems, and developing scenarios. Analysis of foreign fiscal foresights has shown that they become the basis for the development of shorter-term plans for the advance of fiscal systems, pointing out the main directions of fiscal policy, risks and barriers to achieving the goals. However, conducting an interstate analysis of a fiscal foresight remains problematic. This is due to the fact, that there is no single methodology for preparing fiscal foresights, countries choose different research horizons and update periods. It was defined that the basis for the goal-setting of national fiscal foresights was taken: reducing the level of income and welfare inequality, fighting against tax evasion, the transition to a "green" economy, promoting the digital development, stabilizing the socio-demographic condition with an unambiguous conclusion about the need to make adjustments to a national tax system. Countries have chosen as the main long-term fiscal policy actions: "rebalancing" the tax structure from direct taxes on labour and capital to indirect taxes on consumption and taxes on property and resource use; the transition from models based on ownership/sales to models based on the use of assets/goods/services; the introduction of new taxes, changes in rates, etc., the use of digital technologies in the tax payment and administration processes. The analysis of the socio-economic situation in Ukraine was carried out in order to identify factors that are critical in the development of the main vectors for the advance of the country's fiscal system in the future. These are recognized as: demographic and social changes, "depletion" of demand in the face of increased competition and the dependence of the export-oriented economy on the international environment and turbulence in the international economy, income inequality, digitalization, tax evasion, environmental degradation. Based on the results of the analysis of the "National Economic Strategy for the Period up to 2030", it was established that the actions indicated in the Strategy can become the initial data for the development of the first national fiscal foresight as a basis for assessing the long-term sustainability of the current fiscal system , identifying opportunities and risks of transformations of the fiscal policy of Ukraine under the influence of megatrends and intrastate changes associated with the peculiarities of the country's socio-economic development.
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Zahraei, Seyed Mehdi, Jude Herijadi Kurniawan, and Lynette Cheah. "A foresight study on urban mobility: Singapore in 2040." foresight 22, no. 1 (November 21, 2019): 37–52. http://dx.doi.org/10.1108/fs-05-2019-0044.
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Purpose The transportation system in any city is complex and evolving, shaped by various driving forces and uncertainties in the social, economic, technological, political and environmental situations. Its development and demands upon it cannot be projected by simply extrapolating past and current trends. This paper aims to present a foresight study examining the future of urban mobility, focusing on the dense Asian city-state of Singapore. The objective is to develop scenarios for the future of urban mobility, to facilitate future policy implementation by highlighting long term challenges and opportunities for transportation planning in cities. Design/methodology/approach To create future scenarios, the authors first sought to identify key drivers of change through environmental scanning, expert interviews, focus group discussions and technology scanning. These drivers of change were subsequently used in a scenario planning workshop, organized to co-create alternative future visions for urban mobility 2040 with experts and local stakeholders. Findings Two scenarios emerged, called the Shared World and the Virtual World. For each scenario, the authors described the key features in terms of dominant transport modes for the movements of passengers and freight. Subsequently, the authors discussed possible implications of each scenario to the individual, society, industry and government. Originality/value As cities grow and develop, city and transport planners should not only address daily operational issues but also develop a well-informed, long-term understanding of the evolving mobility system to address challenges that lie beyond the five- or even ten-year horizon. By using scenario planning approach, the authors hope to prepare stakeholders for the uncertain futures that are continuously shaped by the decisions today.
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Hertz, Sherrie, Jillian Ross, Leonard Kaizer, and Carol Anne Sawka. "Quality oversight for specialized cancer services." Journal of Clinical Oncology 30, no. 34_suppl (December 1, 2012): 103. http://dx.doi.org/10.1200/jco.2012.30.34_suppl.103.
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103 Background: Cancer Care Ontario (CCO), a provincial agency responsible for continually improving cancer services in Ontario, Canada, reviews selected services with a view to understanding and resolving issues of access, quality, innovation, and funding. Specialized cancer services are low-volume, high-complexity, high-cost, and are not available in every region. They tend to be high-risk, involve a rapidly evolving scientific knowledge base, and a high degree of specialization. A specialized services oversight (SSO) approach has been implemented to address the challenge for optimization of service delivery while providing equitable access to safe, high-quality, best practice care. Methods: The SSO approach involves 1) establishing a provincial forum for expert clinical advice; 2) A regular and systematic process for literature and jurisdictional reviews; 3) provincial-level demand and capacity forecasting; 4) provincial funding linked to evidenced-based eligibility/quality criteria; 5) communication/awareness strategies for appropriate and equitable access. Enablers are CCO structures for performance management, stakeholder engagement, service planning, data management, and CCO’s guiding principles of "transparency, equity, evidence, performance-oriented, active engagement, and value for money." Results: The SSO approach has been implemented in full for PET scanning services, and in part for stem cell transplant (SCT), sarcoma, molecular oncology, prostate brachytherapy, and selected neuroendocrine cancer care. Stakeholder acceptance of the approach has been high. Outputs include provincial guidelines on indications for SCT, performance metrics and benchmarks, multicentre sharing of information, and inter-regional referral processes. Conclusions: Implementation of the SSO approach has introduced provincial-level system planning, formal evidence scanning, sharing of best practices, and performance measurement for high-complexity services where there was no such oversight in the past. The approach is anticipated to avoid access crises and support timely and equitable access to services of high quality, which make optimal use of resources.
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Oughton, Edward J., Zoraida Frias, Mischa Dohler, Jason Whalley, Douglas Sicker, Jim W. Hall, Jon Crowcroft, and David D. Cleevely. "The strategic national infrastructure assessment of digital communications." Digital Policy, Regulation and Governance 20, no. 3 (May 14, 2018): 197–210. http://dx.doi.org/10.1108/dprg-02-2018-0004.
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Purpose Public policy requires effective identification of the current and emerging issues being faced in industry and beyond. This paper aims to identify a set of key issues currently facing digital communications and reviews their relevance for the strategic provision of infrastructure, particularly within the UK context. Design/methodology/approach The methodology focusses on taking a horizon-scanning approach to obtaining current information from a range of authoritative decision makers across industry, government and academia. After structuring the issues identified, these areas are explored by a multi-disciplinary research team covering engineering, economics and computer science. Findings Five key categories were identified including future demand; coverage and capacity; policy and regulation; economics and business models; and technology. The results are reported for both fixed and wireless networks. Shared issues affecting the wider digital ecosystem are also identified including Brexit, connecting remote areas and the degree to which the economics of infrastructure allows for building multiple overlapping infrastructures. The authors find that future demand uncertainty is one of the major issues affecting the digital communications sector driven by rigid willingness-to-pay, weak revenue and an increasing shift from fixed to wireless technologies. Policy must create the market conditions that encourage the entry of new competitors with innovative thinking and disruptive business models. Research limitations/implications A limitation of the analysis is that it is quite UK-focussed; hence, further research could broaden this analysis to assessing issues at a continental or global scale. Originality/value The value of this paper originates from the breadth of the expert elicitation exercise carried out to gather the initial set of issues, followed by the analysis of this data by a multi-disciplinary team of researchers. The results direct a future research agenda, as many issues are indicative of a lack of existing evidence to support effective decision-making.
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Kang, Jukyoung, Tack-Jin Kim, Jong Won Park, Kyo-Young Lee, Doh Hee Park, Sungbin Park, Seok Kim, and Yongju Jung. "A Mesoporous Chelating Polymer-Carbon Composite for the Hyper-Efficient Separation of Heavy Metal Ions." Journal of Nanoscience and Nanotechnology 20, no. 5 (May 1, 2020): 3042–46. http://dx.doi.org/10.1166/jnn.2020.17471.
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The removal of heavy-metal ions from wastewater is an important objective from a public-health perspective, and chelating agents can be used to achieve this aim. Herein, we report the synthesis of mesoporous carbon as a chelating polymer host using nanoarchitectonics approach. Carboxymethylated polyethyleneimine, a chelating polymer, was incorporated into the mesopore walls of mesoporous carbon to create a polymer-mesoporous-carbon composite. Nitrogen adsorption– desorption experiments and scanning electron microscopy (SEM) were used to illustrate the structural advantages of the composite. Co2+ adsorption by the composite material was examined using cobalt nitrate solutions at pH 3. The study revealed that the Co2+-absorption data are most closely modeled by the Langmuir isotherm. The maximum adsorption capacity, calculated by linear regression, was determined to be about 40 mg-Co/g-composite at pH 3. The composite exhibited about a six-times higher adsorption capacity toward a dilute Co solution (12.5 ppm) than that of the pristine mesoporous carbon. In addition, the composite showed a substantially higher distribution coefficient (Kd = 1.54×105) compared to that (Kd = 2.05×102) of the mesoporous carbon. Overall, we expect that the mesoporous composite, with its large mesopores (~20 nm), will be in high demand for adsorption applications.
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Spitzer, Lisa, and Stefanie Mueller. "Registered Report Protocol: Survey on attitudes and experiences regarding preregistration in psychological research." PLOS ONE 16, no. 7 (July 2, 2021): e0253950. http://dx.doi.org/10.1371/journal.pone.0253950.
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Background Preregistration, the open science practice of specifying and registering details of a planned study prior to knowing the data, increases the transparency and reproducibility of research. Large-scale replication attempts for psychological results yielded shockingly low success rates and contributed to an increasing demand for open science practices among psychologists. However, preregistering one’s studies is still not the norm in the field. Here, we propose a study to explore possible reasons for this discrepancy. Methods In a mixed-methods approach, an online survey will be conducted, assessing attitudes, motivations, and perceived obstacles with respect to preregistration. Participants will be psychological researchers that will be recruited by scanning research articles on Web of Science, PubMed, PSYNDEX, and PsycInfo, and preregistrations on OSF Registries (targeted sample size: N = 296). Based on the theory of planned behavior, we predict that positive attitudes (moderated by the perceived importance of preregistration) as well as a favorable subjective norm and higher perceived behavioral control positively influence researchers’ intention to preregister (hypothesis 1). Furthermore, we expect an influence of research experience on attitudes and perceived motivations and obstacles regarding preregistration (hypothesis 2). We will analyze these hypotheses with multiple regression models, and will include preregistration experience as control variable.
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Haghdoost, Fatemeh, Vahid Mottaghitalab, and Akbar Khodaparast Haghi. "Comfortable textile-based electrode for wearable electrocardiogram." Sensor Review 35, no. 1 (January 19, 2015): 20–29. http://dx.doi.org/10.1108/sr-08-2013-719.
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Purpose – The purpose of the current study is to explore the potential possibility of acceleration in recognition, remedial process of heart disease and continuous electrocardiogram (ECG) signal acquisition. The textile-based ECG electrode is prepared by inkjet printing of activator followed by electroless plating of nickel (Ni) particle. Design/methodology/approach – The electrical resistance shows a range of around 0.1 Ω/sq, which sounds quite proper for ECG signal acquisition, as the potential difference according to heart activity on skin surface is in milivolt range. Surface modifications of Ni–phosphorus (P)-plated polyester fiber were studied by scanning electron microscopy, energy dispersive X-ray spectroscopy and X-ray diffractionmethods. The quality of the acquired signal from printed square-shaped sensors in two sizes with areas of 9 and 16 cm2 compared with the standard Ag/Agcl electrode using commercial ECG with the patient in the sitting position. Findings – Comparison of these data led to the consideration of small fabric sensor for better performance and the least disturbance regarding homogeneity and attenuation in electric field scattering. Using these types of sensors in textile surface because of flexibility will provide more freedom of action to the user. Wearable ECG can be applied to solve the problems of the aging population, increasing demand for health services and lack of medical expert. Originality/value – In the present research, a convenient, inexpensive and reproducible method for the patterning of Ni features on commercial polyester fabric was investigated. Printed designs with high electrical conductivity can be used as a cardiac receiving signals’ sensor.
Dissertations / Theses on the topic "Export demand scanning"
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Gould, Richard Robert, and RichardGould@ozemail com au. "International market selection-screening technique: replacing intuition with a multidimensional framework to select a short-list of countries." RMIT University. Social Science & Planning, 2002. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20081125.145312.
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The object of this research was to develop an international market screening methodology which selects highly attractive markets, allowing for the ranges in diversity amongst organisations, countries and products. Conventional business thought is that, every two to five years, dynamic organisations which conduct business internationally should decide which additional foreign market or markets to next enter. If they are internationally inexperienced, this will be their first market; if they are experienced, it might be, say, their 100th market. How should each organisation select their next international market? One previous attempt has been made to quantitatively test which decision variables, and what weights, should be used when choosing between the 230 countries of the world. The literature indicate that a well-informed selection decision could consider over 150 variables that measure aspects of each foreign market's economic, political, legal, cultural, technical and physical environments. Additionally, attributes of the organisation have not been considered when selecting the most attractive short-list of markets. The findings presented in the dissertation are that 30 criteria accounted for 95 per cent of variance at cross-classification rates of 95 per cent. The weights of each variable, and the markets selected statistically as being the most attractive, were found to vary with the capabilities, goals and values of the organisation. This frequently means that different countries will be best for different organisations selling the same product. A
Book chapters on the topic "Export demand scanning"
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Li, Wei, Fan Zhao, Peng Ren, and Zheng Xiang. "A Novel Adaptive Scanning Approach for Effective H.265/HEVC Entropy Coding." In Research Anthology on Recent Trends, Tools, and Implications of Computer Programming, 1133–44. IGI Global, 2021. http://dx.doi.org/10.4018/978-1-7998-3016-0.ch052.
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The block transform video coder of H.265/HEVC has been formulated for a more flexible content representation to satisfy various implementation demands. Here three coefficient-scanning methods of diagonal, horizontal and vertical scan are employed for mapping a 2-D array to a 1-D vector for further reducing redundancy in entropy coding. However, the fixation scanning pattern does not fully exploit the correlation among quantized coefficients and the coding redundancy still exists. In this paper, a new adaptive coefficient scanning (ACS) method is proposed for effective H.265/HEVC entropy coding. Here the characteristic of syntax elements of quantized coefficients is first studied and then the related context probability of symbol is estimated through combining local property. Guided by the principle of entropy coding, the scanning approach is established for higher coding performance. Experimental results demonstrate that a reduction of about 3.6%–4.2% in bit-rate can be observed with almost no loss in coding complexity.
Conference papers on the topic "Export demand scanning"
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Wahl, Jacqueline, and Ken Harris. "CMSX-486® Alloy Update." In ASME Turbo Expo 2009: Power for Land, Sea, and Air. ASMEDC, 2009. http://dx.doi.org/10.1115/gt2009-59675.
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Modern turbine engine performance and life cycle requirements demand single crystal (SX) superalloy turbine airfoil and seal components. However, complex SX components, such as vane segments, can result in severe manufacturing cost challenges due to low manufacturing yield. As presented at TURBO EXPO 2002 and 2006, these requirements led to the development of CMSX-486® alloy, a grain boundary strengthened SX superalloy with improved creep-rupture strength over SX CM 186 LC® alloy. This paper will review the unique properties that make this alloy desirable, with particular attention to ongoing developments. Significant market interest has resulted in additional property evaluation, including strain-controlled low cycle fatigue testing which has produced fatigue lives similar to HIP’ed and solutioned CMSX-4® SX alloy at 1038°C. This was surprising considering the non-homogeneous microstructure of CMSX-486 alloy, which is used in the as-cast + double aged heat treat condition. Also, burner rig dynamic, cyclic oxidation and Type I hot corrosion results will be presented for CMSX-486 (SLS) [La+Y] alloy in comparison to CMSX-4, CMSX-4(SLS)[La+Y] and CMSX-486 alloys. Scanning electron microscopy analysis shows residual sulfur and phosphorus in CMSX-486 (SLS) [La+Y] are tied up as Y and La carbo-sulfides and phosphides.
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Lee, Hyungsuk, and Junghyun Cho. "Development of Conformal PDMS and Parylene Coatings for Microelectronics and MEMS Packaging." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-82955.
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There is a growing demand in the development of small-scale devices in microelectronics and microelectromechanical systems (MEMS). Packaging and reliability of such devices are of great concern as they introduce a number of unique packaging issues that are distinct and different from typical electronic packaging applications. In addition, the packaging or encapsulation materials are often exposed to harsh environments, for which their performance is drastically degraded. Importantly, such devices become lighter and smaller, precluding the use of conventional packaging materials and schemes. Given that, surface protective coatings can provide an innovative solution for some of the aforementioned issues. Polymers have indeed shown such a potential for use either as a standalone coating, or an intermediate layer for the subsequent harder, stiffer coatings. In this study, we explore processes and properties of the three coating systems: i) PDMS, ii) Parylene (para-xylylene), iii) Parylene/PDMS. In particular, parylene coating on PDMS is a focus of this study. The parylene coating having much higher mechanical properties than PDMS provided a way to enhance the surface properties of this PDMS. Proper surface modification of PDMS via oxygen plasma seemed to be essential to generate desirable microstructures of parylene coating. Mechanical properties of such coatings are systematically examined via a nanoindenter. The dynamic nanoindentation is also employed to assess viscoelastic properties, as well as depth-dependent mechanical properties. While characterizing the films using the nanoindentation, the substrate effect influenced the indentation data. In addition, extensive surface characterizations are carried out using atomic force microscope (AFM), scanning electron microscope (SEM), and optical microscopy.
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Braden, Paul, and Kaitlyn Gainer. "Application of the Shape Memory Effect to Restore Smoothness." In ASME 2015 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/smasis2015-8827.
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A major worldwide industry is the display and preservation of historical and rare documents, paintings, canvases, tapestries and other works of art. Many private collectors and museums pay large amounts, such as the $23 million for the U.S. National Gallery and $8 million for the U.S. National Archives. There is an even greater demand for many consumers who desire an affordable way to safely maintain their images in top condition for viewing and enjoyment. Another industry where the smoothness of the paper documents is important is in the shipping and delivery business. Here, many shipments are done with cylindrical tubes that cause the paper to appear bent and not flat. In some cases, this can pose a major problem for scanning and electronic devices which need a flat surface for optimal performance. A novel new alternative to traditional conservation methods is the use of Shape Memory Alloys (SMA’s) to remove wrinkles and other surface anomalies. SMA’s use a thermoelastic property called the Shape Memory Effect (SME) to recover large strains by phase transformation. In this process, the SMA is stretched until the polycrystalline microstructure is detwinned Martensite. Then, energy in the form of heat is applied to the SMA which causes the phase transformation to the more compact Austenite. Thus, a reverse method is the proposed solution for the complex problem faced by art preservation experts. Instead of using large clamps and having to wait for results, we demonstrate how embedded SMA wires in a robust picture frame can provide a continuous restorative force that maintains the picture’s smoothness. Using proper simple wiring from the SMA wires to the picture, it is possible to remove the strains in the paper and hold the picture to the proper smoothness long term. We provide experimental results and offer suggestions for the future use of SMA’s in this new field of art restoration.
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Voigt, Paul, Lars Högner, Barbara Fiedler, Matthias Voigt, Ronald Mailach, Marcus Meyer, and Alkin Nasuf. "Comprehensive Geometric Description of Manufacturing Scatter of High Pressure Turbine Nozzle Guide Vanes for Probabilistic CFD Analysis." In ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/gt2018-76723.
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The increasing demands on jet engines require progressive thermodynamic process parameters, which typically lead to higher aerothermal loadings and accordingly to designs with high complexity. State of the art high pressure turbine (HPT) nozzle guide vane (NGV) design involves vane profiles with three-dimensional features including a high amount of film cooling and profiled endwalls (PEW). Typically, the specific massflow, also called capacity, which governs the engine’s operation, is set by the HPT NGV. Hence, geometric variations due to manufacturing scatter of the HPT NGV’s passage can affect relevant aerodynamic quantities and the entire engine behavior. Within the traditional deterministic design approach, the influences of those geometric variations are covered by conservative assumptions and engineering experience. This paper addresses the consideration of variability due to manufacturing of HPT NGVs through probabilistic CFD investigations. In order to establish a statistical database, 80 HPT NGVs are digitized with a high precision optical 3D scanning system to record the outer geometry. The vane profiles are parametrized by a section based approach. For this purpose, traditional profile theory is combined with a novel method that enables the description of NGV profile variability taking the particular leading edge (LE) shape into account. Furthermore, the geometric variability of PEWs is incorporated by means of principle component analysis (PCA). On this basis, a probabilistic system assessment including a sensitivity analysis in terms of capacity and total pressure loss coefficient is realized. Sampling-based methods are applied in order to conduct a variety of 3D CFD simulations for a typical population of profile and endwall geometries. This probabilistic investigation using realistic input parameter distributions and correlations contributes to a robust NGV design in terms of relevant aerodynamic quantities.