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Journal articles on the topic 'Aerodynamic multiplication'

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1

Алексієвський, Д. Г., К. В. Манаєв, О. О. Панкова, А. В. Таранець та С. Л. Шмалій. "ВІЗУАЛЬНА МАТЕМАТИЧНА МОДЕЛЬ ЕЛЕКТРОМЕХАНІЧНОЇ СИСТЕМИ ВІТРОЕНЕРГЕТИЧНОЇ УСТАНОВКИ З АЕРОДИНАМІЧНИМ МУЛЬТИПЛІКУВАННЯМ". Bulletin of the Kyiv National University of Technologies and Design. Technical Science Series 124, № 4 (2018): 45–55. http://dx.doi.org/10.30857/1813-6796.2018.4.5.

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Building a visual mathematical model of the electromechanical wind power system with aerodynamic multiplication. In the process of constructing a visual mathematical model of the electromechanical system of wind turbines with aerodynamic multiplication, a mathematical apparatus for describing the system in local mean values of variables was used. Verification of the mathematical model was carried out in the MATLAB Simulink program. A visual mathematical model of the electromechanical system of wind turbines with aerodynamic multiplication is developed, which includes mechanical power losses on
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Andrienko, P. D., D. G. Alekseevskiy, O. V. Blyzniakov, O. V. Nemykina, and I. Yu Nemudriy. "EFFICIENCY ANALYSIS OF ELECTROMECHANICAL CONVERSION SYSTEMS OF WIND TURBINES WITH AERODYNAMIC MULTIPLICATION." Tekhnichna Elektrodynamika 2023, no. 6 (2023): 44–53. http://dx.doi.org/10.15407/techned2023.06.044.

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In this article, we have considered the state of development of high-power horizontal wind turbines. The most common wind turbines for operation with variable wind flow speed usually include a frequency converter to ensure the compatibility of generator with network. It leads to decrease in the efficiency of wind energy conversion system, while the use of direct connection of the generator to the axis of wind wheel leads to a significant increase in the weight and cost of the generator. The wind turbine with aerodynamic multiplication is an alternative to such systems. Its prototype with 750 k
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Strunkin, Hlib. "Wind Turbine’s Aerodynamic Multiplication Parameters for Different Types of Generators." Problems of the Regional Energetics, no. 2(66) (May 2025): 121–30. https://doi.org/10.52254/1857-0070.2025.2-66.10.

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Energy transition is impossible without wind power development. The need for a mechanical multiplier to match the speeds of a wind turbine and generator leads to deterioration of the tech-nical system's indicators. Refusal of a mechanical multiplier is possible with the help of aerody-namic multiplication. Despite the presence of work in this direction, there is still no coverage of the influence of aerodynamic multiplication parameters on the choice of a generator. Main objectives of the study – analyze the requirements that a generator makes to wind turbine’s aero-dynamic multiplication para
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4

Strunkin, Hlib. "Autonomous wind power plant with aerodynamic multiplication based on asynchronous generator with a phase rotor with excitation from a voltage-source inverter." Technical sciences and technologies, no. 4 (38) (December 30, 2024): 245–53. https://doi.org/10.25140/2411-5363-2024-4(38)-245-253.

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The article analyzes the methods of increasing the efficiency of converting wind energy into electricity in wind power plants. It is noted that there are both aero-mechanical and electrical methods of increasing the efficiency of converting wind energy into electricity. Multiplierless schemes that allow to increase the efficiency of aero-mechanical conversion of wind energy are considered. These include the use of low-speed generators and aerodynamic multiplication. Aerodynamic multiplication is considered promising and more acceptable for high-power autonomous wind power plants, considering t
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Alekseevskiy, D.G., P.D. Andrienko, and O.V. Nemykina. "Research of the Electric Power Conversion in Wind Turbines with an Aerodynamic Multiplication." Problemele Energeticii Regionale 1 (39) (April 24, 2019): 70–79. https://doi.org/10.5281/zenodo.2650423.

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The paper deals with the research of busbar power losses depending on electrical equipment installation and the dynamic change of the generated power of a wind turbine with aerodynamic multiplication. The analysis of the electricity conversion electromechanical system is carried-out for the first Ukrainian pilot wind turbine with aerodynamic multiplication of the TГ-1000 type. The aim of the article is analytic method creation of analysis of power relative losses in busbars of electrical equipment depend on its arrangement, as well as the research of electromagnetic processes in the electromec
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Wu, Lianhuo, Mingjin Zhang, Fanying Jiang, Zelin Zhou, and Yongle Li. "An Analytical Solution for Unsteady Aerodynamic Forces on Streamlined Box Girders with Coupled Vibration." Sustainability 15, no. 9 (2023): 7312. http://dx.doi.org/10.3390/su15097312.

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This paper is a contribution to analyzing the aerodynamic forces on a streamlined box girder (SBG) with coupled vibration in a potential flow. The key enabling step was to assume that the normal velocity of the airflow at an arbitrary point on the surface of the SBG was equal to the normal velocity of the surface motion. The aerodynamic drag force, lift force, and pitching moment were expressed as functions of the motion state of the SBG and the SBG’s shape-related parameters. To investigate the applicability of this force model, the analytical solution at various angles of attack was compared
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Alekseevskiy, Dmitriy, Aleksandr Alyeksyeyev, Olga Pankova, Konstantin Turyshev, Andrej Taranec, and Sergej Shmalij. "Dynamics of Torque Control of the Electromechanical System of Wind Power with Aerodynamic Multiplication." Bulletin of the National Technical University «KhPI» Series: New solutions in modern technologies 1, no. 26(1302) (2018): 13–18. http://dx.doi.org/10.20998/2413-4295.2018.26.02.

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8

Strunkin, Hlib. "Simulation of the operation of a voltage inverter as part of an autonomous wind power plant with aerodynamic multiplication based on an asynchronous generator with a phase rotor." Technologies and Engineering, no. 6 (March 21, 2025): 69–79. https://doi.org/10.30857/2786-5371.2024.6.7.

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In the context of energy scarcity caused by the destruction of energy infrastructure, instability of electricity supply and growing demand for autonomous energy sources, there is a need to develop independent and efficient energy supply systems. Of particular importance are wind power plants that are able to function independently, ensuring the stability of power supply even in crisis conditions. In this regard, it is important to investigate promising solutions that meet modern quality standards and can integrate into autonomous energy systems. The purpose of the study was to confirm the effi
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9

Paula, Thiago Rosado de, Andrew Gomes Pereira Sarmento, Vitor Paixão Fernandes, et al. "System identification in time domain of flexible aircraft using panel methods." Journal of Physics: Conference Series 2647, no. 19 (2024): 192025. http://dx.doi.org/10.1088/1742-6596/2647/19/192025.

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Abstract The motivation to accurately model the dynamics of flexible aircraft grew with the development of energy-efficient aircraft, consequently, great aspect ratio aircraft. The development of an accurate model that represents the flight dynamics of a flexible aircraft has been pursued by industry and aeronautical research organizations during the last decades. One of these approaches is to find a flexible aircraft model using systems identification methods. This research aims to apply an integrated model containing longitudinal and lateral directional rigid body dynamics, coupled to the fi
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10

de Vasconcelos, Talita Felipe, Bernard Sapoval, José S. Andrade, James B. Grotberg, Yingying Hu, and Marcel Filoche. "Particle capture into the lung made simple?" Journal of Applied Physiology 110, no. 6 (2011): 1664–73. http://dx.doi.org/10.1152/japplphysiol.00866.2010.

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Understanding the impact distribution of particles entering the human respiratory system is of primary importance as it concerns not only atmospheric pollutants or dusts of various kinds but also the efficiency of aerosol therapy and drug delivery. To model this process, current approaches consist of increasingly complex computations of the aerodynamics and particle capture phenomena, performed in geometries trying to mimic lungs in a more and more realistic manner for as many airway generations as possible. Their capture results from the complex interplay between the details of the aerodynami
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11

Yevseiev, Serhii, Oksana Biesova, Dmytro Kyrychenko, et al. "Development of a method for estimating the effect of transformation of the normalized frequency mismatch function of a coherent bundle of radio pulses on the quality of radar frequency resolution." Eastern-European Journal of Enterprise Technologies 4, no. 4(112) (2021): 13–22. http://dx.doi.org/10.15587/1729-4061.2021.238155.

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The necessity of studying the influence of the transformation of the frequency mismatch function of a coherent bundle of radio pulses on the quality of solving the radar frequency resolution problem is substantiated. This solution determines the effectiveness of radar observation of high-speed and maneuvering individual and group aerodynamic objects. The method is based on explicit expressions for calculating the normalized frequency mismatch function of a coherent bundle of radio pulses, taking into account its transformation due to the radial motion of high-speed and maneuvering individual a
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Serhii, Yevseiev, Biesova Oksana, Kyrychenko Dmytro, et al. "Development of a method for estimating the effect of transformation of the normalized frequency mismatch function of a coherent bundle of radio pulses on the quality of radar frequency resolution." Eastern-European Journal of Enterprise Technologies 4, no. 4 (112) (2021): 13–22. https://doi.org/10.15587/1729-4061.2021.238155.

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The necessity of studying the influence of the transformation of the frequency mismatch function of a coherent bundle of radio pulses on the quality of solving the radar frequency resolution problem is substantiated. This solution determines the effectiveness of radar observation of high-speed and maneuvering individual and group aerodynamic objects. The method is based on explicit expressions for calculating the normalized frequency mismatch function of a coherent bundle of radio pulses, taking into account its transformation due to the radial motion of high-speed and maneuvering individual a
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13

Fan, Xiaoyu, Wenchao Liang, Jin Zeng, et al. "Dynamic Characteristics of a Rotating Blade with a Dovetail Fixture." Machines 11, no. 6 (2023): 643. http://dx.doi.org/10.3390/machines11060643.

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Considering rotation-induced centrifugal stiffening, spin softening, and Coriolis effects, the reduced dynamic model of a rotating blade with a dovetail fixture is established in the ANSYS environment via the fixed-interface method for higher computational efficiency and lower memory consumption. Then some parameters such as rotating speed, friction factor, and stator blade number affecting the nonlinear vibration responses of the system under the combined actions of aerodynamic force, centrifugal force, and gravity are elaborately discussed. The results show that: (1) the contact-induced nonl
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14

Tereshchenko, Andrii, and Valeriy Zadiraka. "Implementation of Multidigit Multiplication Basing on Discrete Cosine and Sine Transforms." Cybernetics and Computer Technologies, no. 4 (December 30, 2021): 61–79. http://dx.doi.org/10.34229/2707-451x.21.4.7.

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Introduction. The emergence of new parallel computing systems such as multi-core processors, clusters, distributed systems, due to the solution of various applications in different spheres. Among such problems are the calculation of systems of linear algebraic equations with the number of unknown 33-35 million, the calculation of nuclear reactor shells, modeling of physical and chemical processes, aerodynamics, hydrodynamics, information security, and so on. This greatly expands the use of multidigit arithmetic, due to the fact that ignoring rounding errors leads to the fact that sometimes com
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15

Ma, Yudiyang, Jing Zhang, Dankang Li, et al. "Genetic Susceptibility Modifies Relationships Between Air Pollutants and Stroke Risk: A Large Cohort Study." Stroke 55, no. 1 (2024): 113–21. http://dx.doi.org/10.1161/strokeaha.123.044284.

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BACKGROUND: The extent to which genetic susceptibility modifies the associations between air pollutants and the risk of incident stroke is still unclear. This study was designed to investigate the separate and joint associations of long-term exposure to air pollutants and genetic susceptibility on stroke risk. METHODS: The participants of this study were recruited by the UK Biobank between 2006 and 2010. These participants were followed up from the enrollment until the occurrence of stroke events or censoring of data. Hazard ratios (HRs) and 95% CIs for stroke events associated with long-term
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16

Pylak, Dorota, Paweł Karczmarek, and Paweł Wójcik. "Approximate Solution of a Singular Integral Equation with a Cauchy Kernel on the Euclidean Plane." Computational Methods in Applied Mathematics 18, no. 4 (2018): 741–52. http://dx.doi.org/10.1515/cmam-2017-0052.

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AbstractMultidimensional singular integral equations (SIEs) play a key role in many areas of applied science such as aerodynamics, fluid mechanics, etc. Solving an equation with a singular kernel can be a challenging problem. Therefore, a plethora of methods have been proposed in the theory so far. However, many of them are discussed in the simplest cases of one–dimensional equations defined on the finite intervals. In this study, a very efficient method based on trigonometric interpolating polynomials is proposed to derive an approximate solution of a SIE with a multiplicative Cauchy kernel d
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17

Garbo, Andrea, Jigar Parekh, Tilo Rischmann, and Philipp Bekemeyer. "Multi-Fidelity Adaptive Sampling for Surrogate-Based Optimization and Uncertainty Quantification." Aerospace 11, no. 6 (2024): 448. http://dx.doi.org/10.3390/aerospace11060448.

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Surrogate-based algorithms are indispensable in the aerospace engineering field for reducing the computational cost of optimization and uncertainty quantification analyses, particularly those involving computationally intensive solvers. This paper presents a novel approach for enhancing the efficiency of surrogate-based algorithms through a new multi-fidelity sampling technique. Unlike existing multi-fidelity methods which are based on a single multiplicative acquisition function, the proposed technique decouples the identification of the new infill sample from the selection of the fidelity le
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18

Serhii, Yevseiev, Kuznietsov Oleksandr, Herasimov Sergey, et al. "Development of an optimization method for measuring the Doppler frequency of a packet taking into account the fluctuations of the initial phases of its radio pulses." Eastern-European Journal of Enterprise Technologies 2, no. 9(110) (2021): 6–15. https://doi.org/10.15587/1729-4061.2021.229221.

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The necessity of estimating the decrease in the accuracy of measuring the informative parameters of a radar signal in real conditions of its propagation and reflection has been substantiated. The results of the estimation determine the requirements for optimizing this measurement to achieve the required efficiency. A numerical analysis of the decrease in the accuracy of measuring the Doppler frequency of a coherent packet is presented, depending on the statistical characteristics of fluctuations of the initial phases of its radio pulses. Expressions are given for calculating the fluc
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19

Shvydkyi, O. G. "Application of Tunnel Mathematics for Solving the Steady Lamé and Navier-Stokes Equations." Innovation in Science and Technology 2, no. 4 (2023): 1–14. http://dx.doi.org/10.56397/ist.2023.07.01.

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The theory of functions of a complex variable is a hybrid of vector algebra and ordinary algebra. It makes it possible to work with vector quantities as with algebraic ones. The modern theory of functions of a complex variable was created by the French mathematician Augustin Cauchy (1789-1857), later it was rapidly developed and found its application in solving various problems of physics—in aerodynamics, hydrodynamics, elasticity theory, etc. However, this theory is used exclusively for solving problems on the plane. Therefore, the next natural step is to extend this theory into space, so tha
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20

Wei, Yaguang, Yan Wang, Xiao Wu, et al. "Causal Effects of Air Pollution on Mortality Rate in Massachusetts." American Journal of Epidemiology 189, no. 11 (2020): 1316–23. http://dx.doi.org/10.1093/aje/kwaa098.

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Abstract Air pollution epidemiology studies have primarily investigated long- and short-term exposures separately, have used multiplicative models, and have been associational studies. Implementing a generalized propensity score adjustment approach with 3.8 billion person-days of follow-up, we simultaneously assessed causal associations of long-term (1-year moving average) and short-term (2-day moving average) exposure to particulate matter with an aerodynamic diameter less than or equal to 2.5 μm (PM2.5), ozone, and nitrogen dioxide with all-cause mortality on an additive scale among Medicare
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21

Yevseiev, Serhii, Oleksandr Kuznietsov, Sergey Herasimov, et al. "Development of an optimization method for measuring the Doppler frequency of a packet taking into account the fluctuations of the initial phases of its radio pulses." Eastern-European Journal of Enterprise Technologies 2, no. 9 (110) (2021): 6–15. http://dx.doi.org/10.15587/1729-4061.2021.229221.

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The necessity of estimating the decrease in the accuracy of measuring the informative parameters of a radar signal in real conditions of its propagation and reflection has been substantiated. The results of the estimation determine the requirements for optimizing this measurement to achieve the required efficiency. A numerical analysis of the decrease in the accuracy of measuring the Doppler frequency of a coherent packet is presented, depending on the statistical characteristics of fluctuations of the initial phases of its radio pulses. Expressions are given for calculating the fluctuation co
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22

Aleksiyivskiy, D. G., P. D. Andrienko, V. P. Metelskiy, and I. Y. Nemudriy. "Analysis of the operation of a wind power plant with aerodynamic multiplication." Electrical Engineering and Power Engineering, no. 1 (February 22, 2012). http://dx.doi.org/10.15588/1607-6761-2012-1-15.

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23

Christensen, D., P. Cantin, D. Gutz, et al. "Development and Demonstration of a Stability Management System for Gas Turbine Engines." Journal of Turbomachinery 130, no. 3 (2008). http://dx.doi.org/10.1115/1.2777176.

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Rig and engine test processes and in-flight operation and safety for modern gas turbine engines can be greatly improved with the development of accurate on-line measurement to gauge the aerodynamic stability level for fans and compressors. This paper describes the development and application of a robust real-time algorithm for gauging fan/compressor aerodynamic stability level using over-the-rotor dynamic pressure sensors. This real-time scheme computes a correlation measure through signal multiplication and integration. The algorithm uses the existing speed signal from the engine control for
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24

Strunkin, Hlib. "Simulation of the Operation of an Autonomous Wind Power Plant with Aerodynamic Multiplication Based on an Asynchronous Generator with a Phase Rotor with Excitation From a Voltage-Source Inverter." Turkish Journal of Electrical Power and Energy Systems, January 28, 2025. https://doi.org/10.5152/tepes.2025.24034.

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25

Razmavaran, Mohammad Hadi, Ali Reza Sepaskhah, and Seyed Hamid Ahmadi. "Revisiting reference evapotranspiration calculation under regional advection and its effect on single and dual crop coefficients: An empirical approach for quinoa crop." Meteorological Applications 31, no. 2 (2024). http://dx.doi.org/10.1002/met.2189.

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AbstractAdvection is a prevailing meteorological phenomenon in the arid and semi‐arid environments that directly affects the crop and soil hydrology. It could have a great impact on the rate of standard crop evapotranspiration (ETc) in the irrigated areas. Therefore, it is required to take it into consideration while computing crop water requirement through the physically based meteorological procedures. The objectives of this study are (1) simple modification of the Penman–Monteith (PM) equation in calculation of the grass reference evapotranspiration (ETo) to implement the local advection, (
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26

Kashikar, Rama, Arun Kumar Kotha, Rakshya Shrestha, Rudragouda Channappanavar, and Mahavir Bhupal Chougule. "Formulation and In-Vitro Testing of Nebulized Camostat Mesylate Loaded Nanoliposomes for the Treatment of SARS-CoV- 2 Infection." AAPS PharmSciTech 26, no. 5 (2025). https://doi.org/10.1208/s12249-025-03099-3.

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Abstract COVID- 19, caused by the coronavirus SARS-CoV- 2, has arisen as a global health epidemic, claiming the lives of millions of people throughout the world. Combating the pandemic has involved developing and approving vaccines and antiviral products. Camostat Mesylate (Camo) is a TMPRSS2 inhibitor that inhibits virus-cell membrane fusion and, thereby, viral multiplication. Significant limitations of using oral Camo include the limited amount of Camo reaching the site of action, lungs, side effects due to distribution to all tissues, and enzymatic breakdown in the gut. This investigation a
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27

Stoffel, Tyler D., Christopher D. Karlgaard, Todd R. White, and Thomas K. West. "Fusion of In-Flight Aerothermodynamic Heating Sensor Measurements Using Kalman Filtering." Journal of Spacecraft and Rockets, December 29, 2023, 1–12. http://dx.doi.org/10.2514/1.a35641.

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On February 18th, 2021, the Mars 2020 entry system successfully delivered the Perseverance rover to the surface of Mars at Jezero Crater. The entry capsule carried instrumentation installed on the heatshield and backshell, named “Mars Entry, Descent, and Landing Instrumentation 2.” The instruments were used to measure the aerodynamic and aerothermodynamic performance of the entry vehicle. Five sensors at two locations (three sensors at one location and two sensors at the second location), including a thermocouple plug, heat flux gauge, and a radiometer, were co-located on the backshell. The se
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