Добірка наукової літератури з теми "Inertial measuring module"
Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями
Ознайомтеся зі списками актуальних статей, книг, дисертацій, тез та інших наукових джерел на тему "Inertial measuring module".
Біля кожної праці в переліку літератури доступна кнопка «Додати до бібліографії». Скористайтеся нею – і ми автоматично оформимо бібліографічне посилання на обрану працю в потрібному вам стилі цитування: APA, MLA, «Гарвард», «Чикаго», «Ванкувер» тощо.
Також ви можете завантажити повний текст наукової публікації у форматі «.pdf» та прочитати онлайн анотацію до роботи, якщо відповідні параметри наявні в метаданих.
Статті в журналах з теми "Inertial measuring module"
1
Grabiński, Jakub, and Konrad Waluś. "The system of acquisition and archiving of motion parameters of mobile systems - an overview of measuring sensors." AUTOBUSY – Technika, Eksploatacja, Systemy Transportowe 20, no. 1-2 (February 28, 2019): 234–40. http://dx.doi.org/10.24136/atest.2019.042.
Повний текст джерелаАнотація:
As part of the work, a measuring system is presented that allows collecting and recording vehicle motion parameters. To build the system, an inertial navigation module was used, consisting of two-axis accelerometers and gyroscopes made in MEMS technology. The tests were carried out and calculation methods were developed to allow the collected data to be referenced, to a point in the three-dimensional space, in order to determine the trajectory of the vehicle's movement. The built-in measuring system uses three types of sensors: accelerometer, gyroscope, magnetometer. Each of these sensors allows the measurement of the physical size in three orthogonal axes of the Cartesian coordinate system. In addition, the work uses a satellite navigation module (GPS), as a reference on the "macro" scale (coordinate system related to the center of the globe with a radius of about 6371 km) for the inertial updating module (INS / IMU), enabling accurate measurement in the "micro" scale (the coordinate system associated with the starting point of the traffic for the route, the length of which does not exceed several hundred meters). The article presents an overview of available measuring sensors with special consideration of the parameters of selected sensors and errors introduced into the measurement system.
2
Chernyak, Mykola, and Vadym Kolesnyk. "Reduction of time errors of the inertial measuring module by realization of its structural redundancy on the basis of three-axis micromechanical measuring instruments." MECHANICS OF GYROSCOPIC SYSTEMS, no. 39 (May 20, 2020): 66–80. http://dx.doi.org/10.20535/0203-3771392020229096.
Повний текст джерелаАнотація:
Redundant inertial measurement units (IMU) are used in security-critical operations since the advent of inertial technology. This approach allows you to create fault-tolerant systems that can detect and isolate defective sensors. Besides, experimental results have shown that redundant IMU is also an effective way to improve the performance of navigation systems. The question is only in the dependence of the accuracy of the unit on the number of sensors used and their mutual orientation.
This paper analyses the influence of spatial orientation on the accuracy of an IMU with a redundant configuration in the case of using triaxial orthogonal micromechanical measuring modules as atomic structural units.
The first part of this article concentrates on the geometry of the redundant IMU. Analysis of its metrological model of a redundant showed that, when dealing with orthogonal IMU triads, its resulting accuracy is independent of the relative orientation between them. This fact presents important practical implications since it demonstrates that using complex large-scale installation structures can be avoided. As a result, it is enough to place instead of an array of units, for example, only on one printed circuit board with any orientation. Also, it was found the relationship between the number of sensors employed and the accuracy improvement that enables us to ascertain the exact number of sensors needed to design a navigation system with a certain precision.
The second part of this article shows the experimental approval of theoretical conclusions during the testing of a prototype block based on three low-cost units (MPU6050) built according to a symmetric tetrahedron scheme.
The accuracy of the redundant block was experimentally evaluated based on the value of the errors in determining the modulus of gravity acceleration and a given angular velocity of a test rotary platform in a series of positions. The performance of the tested inertial measuring block was better on average in comparison with anyone module from this block that proved the possibility of using these approaches for MEMS sensors in high-accuracy application areas.
3
Yang, Zi Jian, and Cong Sun. "Design and Research of Quadcopter Navigator." Applied Mechanics and Materials 635-637 (September 2014): 1220–23. http://dx.doi.org/10.4028/www.scientific.net/amm.635-637.1220.
Повний текст джерелаАнотація:
This paper studies the autonomous navigation equipment of Quadcopter. SINS/GPS integrated navigation technology, ultrasonic ranging and barometric altimeter is used in the autonomous navigation system. Navigation board includes measuring height subsystem and measurement position subsystem. The former includes an inertial navigation module and GPS module using the Kalman filter for data fusion, which gets a more accurate and stable location information. Quadcopter height measurement subsystem, using ultrasound and barometers. Complementary filter for effective data fusion, is used to ensure the reliability of height measurement.
4
Biagetti, Giorgio, Paolo Crippa, Laura Falaschetti, and Claudio Turchetti. "A Multi-Channel Electromyography, Electrocardiography and Inertial Wireless Sensor Module Using Bluetooth Low-Energy." Electronics 9, no. 6 (June 4, 2020): 934. http://dx.doi.org/10.3390/electronics9060934.
Повний текст джерелаАнотація:
This paper proposes a wireless sensor device for the real-time acquisition of bioelectrical signals such as electromyography (EMG) and electrocardiography (ECG), coupled with an inertial sensor, to provide a comprehensive stream of data suitable for human activity detection, motion analysis, and technology-assisted nursing of persons with physical or cognitive impairments. The sensor is able to acquire up to three independent bioelectrical channels (six electrodes), each with 24 bits of resolution and a sampling rate up to 3.2 kHz, and has a 6-DoF inertial platform measuring linear acceleration and angular velocity. The bluetooth low-energy wireless link was chosen because it allows easy interfacing with many consumer electronics devices, such as smartphones or tablets, that can work as data aggregators, but also imposes data rate restrictions. These restrictions are investigated in this paper as well, together with the strategy we adopted to maximize the available bandwidth and reliability of the transmission within the limits imposed by the protocol.
5
Grabiński, Jakub, and Konrad Waluś. "The system of acquisition and archiving of motion parameters of mobile systems - mathematical methods, digital filters." AUTOBUSY – Technika, Eksploatacja, Systemy Transportowe 20, no. 1-2 (February 28, 2019): 228–33. http://dx.doi.org/10.24136/atest.2019.041.
Повний текст джерелаАнотація:
The work presents numerical methods and digital filters that enable correction of the measurement signal obtained during experimental tests of vehicle motion parameters. The inertial navigation measuring module used consists of three-axis accelerometers, gyroscopes made in MEMS technology and a magnetometer. The collected measurement data made it possible to refer them to a point in three-dimensional space in order to determine the trajectory of vehicle movement. The article presents numerical methods of rotation of the local coordinate system to the global system and selected digital filters enabling smoothening the measurement signal in real time.
6
Dichev, Dimitar, Hristofor Koev, and Petr Louda. "A MEASURING SYSTEM WITH AN ADDITIONAL CHANNEL FOR ELIMINATING THE DYNAMIC ERROR." Journal of Theoretical and Applied Mechanics 44, no. 1 (March 1, 2014): 3–20. http://dx.doi.org/10.2478/jtam-2014-0001.
Повний текст джерелаАнотація:
Abstract The present article views a measuring system for determining the parameters of vessels. The system has high measurement accuracy when operating in both static and dynamic mode. It is designed on a gyro-free principle for plotting a vertical. High accuracy of measurement is achieved by using a simplified design of the mechanical module as well by minimizing the instrumental error. A new solution for improving the measurement accuracy in dynamic mode is offered. The approach presented is based on a method where the dynamic error is eliminated in real time, unlike the existing measurement methods and tools where stabilization of the vertical in the inertial space is used. The results obtained from the theoretical experiments, which have been performed on the basis of the developed mathematical model, demonstrate the effectiveness of the suggested measurement approach.
7
Fedorenko, V. F., and V. E. Tarkivskiy. "Digital Wireless Technology to Measure Agricultural Performance." Agricultural Machinery and Technologies 14, no. 1 (March 24, 2020): 10–15. http://dx.doi.org/10.22314/2073-7599-2020-14-1-10-15.
Повний текст джерелаАнотація:
When testing agricultural machinery in order to determine its functional indicators, the ability to wirelessly transmit data between sensors, measuring and information systems are important. (Research purpose) To develop methods and create wireless digital devices for determining the functional indicators of agricultural tractors and machines with the ability to wirelessly transmit data to a remote control point in real time. (Materials and methods) The authors assumed that it was possible to determine the slipping of driving wheels using an inertial navigation system. It was found that in order to calculate real-time indicators obtained using wireless technologies, it was necessary to determine the characteristics of the input signals of discrete sensors on the side of the measuring system. (Results and discussions) The authors substantiated a method for determining the period of incoming signals of discrete sensors with an accuracy of 0.001 seconds for wireless information transmission. They proposed the design of a slipping sensor for an energy vehicle driving wheels, the main element of which is an inertial wheel position sensor. They developed a discrete signal input module and an inertial slipping sensor with the possibility of wireless data transmission based on a radio system with a carrier frequency of 433 megahertz. During field tests, it was found that the accuracy of determining slippage using the inertial wireless sensor IP-291 does not exceed 1 percent; the range of stable radio communication from the tested object to the test control center reaches 1000 meters; the current indicators obtained through digital radio communication did not differ from the indicators obtained in the tractor cab. (Conclusions) The authors worked out an effective system for wireless information transfer with the ability to calculate the performance of the tested equipment in real time.
8
Rugescu, R. D., Cr E. Constantinescu, M. Al Barbelian, Alina Bogoi, and C. Dumitrache. "Orbital Injection Errors and Sensor Requirements for NERVA Space Launchers." Applied Mechanics and Materials 325-326 (June 2013): 813–18. http://dx.doi.org/10.4028/www.scientific.net/amm.325-326.813.
Повний текст джерелаАнотація:
The input module of the NERVA space launcher guidance system consisting of the inertial and sensor platform is responsible for the basic accuracy if the ascent trajectory and injection efficiency. The sample rate magnitude and data filtering along the real time trajectory are the only tools available for improving the guidance accuracy up to the level of requirements to secure admissible orbital injection error and the subsequent flight corridor during the orbital ascent. Analysis of the NERVA-1 flight telemetry flow from the onboard inertial platform raises the problem of the optimal selection of the onboard sample rate and of the rate of telemetry, which are not identical. The orbit injection errors are chosen from the orbit altitude constraints and subsequent accuracy requirements for the inertial sensors are derived. They show that the accuracy requirements are moderate and may be covered with almost conventional sensors. To improve the flight guidance accuracy the rocket motor chamber pressure and thrust are measured and observation of the preflight zero drift, recording noise and of the high level of embedded noise during both powered and coast atmospheric flight is performed. Simple filtering based on frequency Fourier analysis is delivered with conclusions regarding the intelligent algorithm enhancement that are developed and implemented on the next generation of flight research drone missiles RT-759M NERVA-2, right in preparation. The main rationale of that algorithm stands in the method of discriminating between false and true information on each measuring point immediately after the data are delivered by the sensors. Learning procedure from previous preflight recordings and from gradual accumulation of concurrent data streams subjected to FF spectral analysis are combined to improve data filtering, for immediate release to the next module of the autopilot. The rate of sampling is optimized from the analysis of the previous flight, inertial data records and test stand pressure and thrust records that show the level of noise. The behavior of the electronics under the dynamical loads of the rocket flight, involving overloads of more than 20 g-s and the level of vibration during the real flight and other sources of measuring errors are also focused in the research. During simulated work of the sensor platform the algorithm has been acceptably validated and prepared for real flight test performance. Information important for the NERVA autopilot design activity is structured through the multiple variance approach.
9
Gorbenko, O. M., M. V. Zhukov, S. V. Pichahchi, I. D. Sapozhnikov, M. L. Felshtyn, and A. O. Golubok. "COMPACT SCANNING PROBE MICROSCOPE HEAD BASED ON INERTIAL THRUSTERS USING PIEZOPACKETS." NAUCHNOE PRIBOROSTROENIE 31, no. 2 (May 25, 2021): 3–22. http://dx.doi.org/10.18358/np-31-2-i322.
Повний текст джерелаАнотація:
The instrumental principles of constructing a compact measuring head of a scanning probe microscope are discussed. To minimize the overall dimensions, a piezo package is used, which makes it possible to implement in one unit both the functions of the actuating element of the SPM tracking system and the functions of the module for approaching the probe to the sample. A control scheme for a piezo-inertial linear step mover is presented, and histograms of the step size distribution are measured. Diagrams of compact SPM heads operating in tunneling and semi-contact power modes using self-sensing probe sensors are presented. To increase the size of the survey SPM images, scanning over several overlapping areas was implemented with further stitching of the SPM images in a single frame. The algorithm for stitching SPM images is discussed. The deviations in the directions of the stage and probe movements, arising during the new scanning frame selection, are being corrected within the framework of the SPM image stitching algorithm. The results of capturing SPM images using a compact SPM head and stitching SPM images by means of elaborated algorithms are presented.
10
Kwon, Seong-Geun, Oh-Jun Kwon, Ki-Ryong Kwon, and Suk-Hwan Lee. "UWB and MEMS IMU Integrated Positioning Algorithm for a Work-Tool Tracking System." Applied Sciences 11, no. 19 (September 23, 2021): 8826. http://dx.doi.org/10.3390/app11198826.
Повний текст джерелаАнотація:
In this paper, we address a system that can accurately locate and monitor work tools in a complex assembly process, such as automotive production. Our positioning monitoring system is positioned by a combined sensor of the UWB module and the MEMS IMU (inertial measuring unit) sensor based on the extended Kalman filter. The MEMS IMU sensor provides the positioning calibration information. The proposed method incorporates IMU and UWB positioning to compensate for errors that can only occur in UWB positioning through the extended Kalman filter (EKT). This EKT is improved by the error dynamic equation derived from the sparse state-space matrix. Also, the proposed method computes the transmission time and distance between the tag and anchor of the UWB module by the TWR (two-way range) system. The tag of a mobile node, which is attached to a moving tool, measures the position of the work tool and transmits the position coordinate data to the anchor. Here, the proposed method uses the trilateration localization method by the confidence distance compensation to prevent the distance error by obstacles and changes in the indoor environment. Experimental results verified that the proposed method confirms whether a specific tool is accurately used according to the prescribed regulations and has more positioning accuracy than the conventional methods.
Дисертації з теми "Inertial measuring module"
1
Федоров, Михайло Володимирович. "Двоколісний робот з гіростабілізованою платформою". Master's thesis, КПІ ім. Ігоря Сікорського, 2021. https://ela.kpi.ua/handle/123456789/45686.
Повний текст джерелаАнотація:
Широке розповсюдження дешевих мікроелектромеханічних чутливих елементів призвело до відповідного зростання сфер їхнього застосування. Спираючись на підходи інерціальної навігації, теорії керування та стабілізації, стало можливим розробка алгоритмічного забезпечення для різноманітних автономних транспортних засобів, роботів, тощо.
Так ідеологія індикаторних гіростабілізаторів у поєднанні із класничими задачами по керуванню оберненими маятниками, покладені на сучасні технічні засоби, дозволяє легко синтезувати гіроскопічностабілізовані платформи з прийнятною точністю.
Актуальним стає задача розробки оптимальних систем керування нестійкими об’єктами з використанням мікроелектромеханічних чутливих елементів та недорогих мікроконтролерів.
Мета даної роботи полягає в спробі реалізувати оптимальне управління двоколісною платформою для її стабілізації у вертикальному положенні з загальнодоступних компонентів, модулів.
Дана мета потребує вирішення наступних дослідницьких завдань:
• аналіз сучасних об’єктів гіроскопічної стабілізації та матеріально-технічної бази;
• створення математичної моделі гіростабілізованої платформи;
• розробка аналітичного та програмного забезпечення для керування нестійким маятником;
• створення макету системи та проведення досліджень.
Для виконання поставлених завдань та досягнення мети цієї дипломної роботи були використані методи теорії автоматичного керування, безплатформної інерціальної навігації.
Наукова новизна роботи полягає у впровадженні алгоритму безплатформної інерціальної системи орієнтації для визначення кутової орієнтації платформи та у формуванні пропорційно-інтегрально-диференціального регулятора керування швидкістю обертання кроковими двигунами колес.
Практична значимість роботи розробці алгоритмічно-програмного комплексу стабілізації двоколісною платформою, що використовує повноцінний мікроелектромеханчний інерціальний вимірювальний модуль, систему початкового калібрування сигналів чутливих елементів, визначення поточних кутів нахилу основи та розрахунку швидкості обертання двигунів ПІД регулятором.
Об'єктом дослідження роботи є двоколісна гіростабілізована платфорам.
Предметом дослідження виступає програмно-алгоритмічне забезпечення керування платформою.The widespread use of cheap microelectromechanical sensing elements has led to a corresponding increase in their areas of application. Based on the approaches of inertial navigation, control theory and stabilization, it became possible to develop algorithmic software for various autonomous vehicles, robots, etc. Thus, the ideology of indicator gyrostabilizers in combination with the classic tasks of inverted pendulum control, assigned to modern technical means, allows you to easily synthesize gyroscopically stabilized platforms with acceptable accuracy. The task of developing optimal control systems for unstable objects using microelectromechanical sensing elements and inexpensive microcontrollers is becoming urgent. The purpose of this work is to try to implement optimal control of the two-wheeled platform to stabilize it in a vertical position from publicly available components, modules. This goal requires the solution of the following research tasks: • analysis of modern objects of gyroscopic stabilization and material and technical base; • creation of a mathematical model of the gyrostabilized platform; • development of analytical and software for unstable pendulum control; • creating a system layout and conducting research. Methods of the theory of automatic control, free platform inertial navigation were used to perform the tasks and achieve the goal of this thesis. The scientific novelty of the work is the introduction of the algorithm of free platform inertial orientation system to determine the angular orientation of the platform and the formation of proportional-integral-differential speed control of stepper motors. The practical significance of the work is the development of algorithmic and software complex stabilization two-wheeled platform using a full microelectromechanical inertial measuring module, the system of initial calibration of signals of sensitive elements, determining the current angles of inclination of the base and calculating engine speed. The object of study is a two-wheeled gyrostabilized platforms. The subject of the study is the software and algorithmic software for platform management.
Книги з теми "Inertial measuring module"
1
Uncertainty analysis of inertial model attitude sensor calibration and application with a recommended new calibration method. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1999.
Знайти повний текст джерелаЧастини книг з теми "Inertial measuring module"
1
Joshi Rajan, T., K. Surya Kumar, and K. Hariharan. "Displacement Estimation by Savitzky Golay Filtering Technique through Inertial Sensor." In New Frontiers in Communication and Intelligent Systems, 377–82. Soft Computing Research Society, 2021. http://dx.doi.org/10.52458/978-81-95502-00-4-39.
Повний текст джерелаАнотація:
Contactless displacement measurement using low-cost sensor modules is vital in engineering applications like elevators. To achieve contactless displacement measurement with high resolution and reliability, a new method of Displacement Estimation on Navigators (DEON) is proposed. The purpose of the proposed approach is to estimate the navigator’s motion using a micro electro mechanical system based accelerometer and to compute the actual displacement covered by the navigators. The error profiles are analysed in acceleration signal which is captured by the accelerometer and it is extracted and calibrated to remove the offset drift error. Further, the data has been processed to reduce random drift error by applying the Savitzky–Golay filter. Then, the principles of integral calculus are applied in the time-domain and displacement is obtained by integrating acceleration twice. The proposed algorithm aimed at measuring displacement caused by the vibration to the object. The similarity between actual and estimated displacement is 98%.
Тези доповідей конференцій з теми "Inertial measuring module"
1
Li, Chen, and Liu Yanzhu. "The Robust Adaptive Control of Free-Floating Space Manipulator Systems." In ASME 2001 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/detc2001/vib-21534.
Повний текст джерелаАнотація:
Abstract In this paper, the kinematics and dynamics of free-floating space manipulator systems are analyzed, and it is shown that the Jacobian matrix and the dynamic equations of the system are nonlinearly dependent on inertial parameters. In order to overcome the above problems, the system is modeled as under-actuated robot system, and the idea of augmentation approach is adopted. It is demonstrate that the augmented generalized Jacobian matrix and the dynamic equations of the system can be linearly dependent on a group of inertial parameters. Based on the results, the robust adaptive control scheme for free-floating space manipulator with uncertain inertial parameters to track the desired trajectory in workspace is proposed, and a two-link planar space manipulator system is simulated to verify the proposed control scheme. The proposed control scheme is computationally simple, because we choose to make the controller robust to the uncertain inertial parameters rather than explicitly estimating them online. In particular, it require neither measuring the position, velocity and acceleration of the floating base with respect to the orbit nor controlling the position and attitude angle of the floating base.
2
Tang, Xiaoteng, and Li Chen. "Robust Variable Structure Control for Free-Floating Space Robot System With Dual-Arms in Joints Space." In ASME 2009 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/detc2009-87303.
Повний текст джерелаАнотація:
In this paper, the kinematics and dynamics of free-floating space robot system with dual-arms are analyzed. It is shown that the dynamic equations of the system are nonlinearly according to inertial parameters. In order to overcome these problems, the system is modeled as under-actuated robot system, and the idea of augmentation approach is adopted. It is demonstrated that the dynamic equations of the system can be linearly depending on a group of inertial parameters. Based on this result, a robust variable structure control scheme for free-floating space robot system with dual-arms with uncertain inertial parameters to track the desired trajectories in joint space is proposed, and a planar space robot system with dual-arms is simulated to verify the proposed control scheme. The advantage of the control scheme proposed is that it requires neither measuring the position, velocity and acceleration of the floating base with respect to the orbit nor controlling the position and attitude angle of the floating base. In addition to this advantage, it is computationally simple, because of choosing the controller robust for the uncertain inertial parameters rather than explicitly estimating them online.
3
Lehotzky, David, and Zoltan Dombovari. "Modeling and Stability of Milling Processes With Active Damping." In ASME 2019 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/detc2019-97551.
Повний текст джерелаАнотація:
Abstract In the recent decade, active dampers have been introduced to machining for the avoidance of machine tool chatter in milling processes. The tuning strategy for most of these devices is based on models which do not account for the dynamics of control loop within the active dampers, hence neglect the dynamics of actuator and measuring device, and do not consider filtering. However, these simplified models might lead to inaccurate stability predictions which can deteriorate the performance of active dampers. In order to better approximate the real behavior of milling processes controlled by active dampers, this paper develops a new mathematical model which incorporates the dynamics of control loop within these devices. In particular, the inertial actuator is modeled as an electromagnetic proof-mass transducer, while the dynamics of piezoelectric accelerometer and finite-impulse-response filtering are also taken into account. By the computation of stability lobe diagrams, it is shown that, at low-frequency actuation and at high-speed milling, the consideration of control loop dynamics in active dampers can be essential.
4
Shangguan, Wen-Bin, Yumin Wei, Subhash Rakheja, Xu Zhao, Jun-wei Rong, and Ya-jie Wang. "A Study on Calculation Method of Natural Frequency for Rubber Damped Torsional Vibration Absorbers." In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-37646.
Повний текст джерелаАнотація:
The natural frequency is the key performance parameters of a rubber materials damper, and it is determined by the static and dynamic shear properties of the rubber materials (rubber ring) and the moment of inertia of the inertia ring. The rubber ring is usually in compression state, and its static and dynamic shear properties are dependent on its sizes, compression ratio and chemical ingredients. A special fixture is designed and used for measuring static and dynamic shear performance of a rubber ring under different compression ratios in the study. To characterize the shear static and dynamic performances of rubbers, three constructive models (Kelvin-Voigt, the Maxwell and the fractional derivative constitutive model) are presented and the method for obtaining the model parameters in the fractional derivative constructive models are developed using the measured dynamic performance of a rubber shear specimen. The natural frequency of a rubber materials damper is calculated using the fractional derivative to characterize the rubber ring of the damper, and the calculated frequencies are compared with the measurements.
5
Zhang, Huisheng, Ming Su, and Shilie Weng. "The Hardware-in-the-Loop Simulation Study on the Control Strategy of Gas Turbine." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-33189.
Повний текст джерелаАнотація:
A 3-shaft gas turbine engine for ship propulsion was taken as an object to establish the hardware-in-the-loop simulation system, which is composed of computers, real physical parts, measuring instruments, interfaces between physical parts and computers, and the network for communication, as well as the relevant software including mathematical models of the gas turbine engine. “Hardware-in-the-loop” and “volume inertia effects” are the two major features of this simulation system. In comparison with traditional methods for gas turbine simulation, the new simulation platform can implement simulation in real time and also can test the real physical parts performance through integration of the real physical parts and the mathematical model in a computer.
6
Schatz, M., T. Eberle, M. Grübel, J. Starzmann, D. M. Vogt, and N. Sürken. "Two-Phase Flow Modeling and Measurements in Low-Pressure Turbines: Part 2 — Turbine Wetness Measurement and Comparison to CFD-Predictions." In ASME Turbo Expo 2014: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/gt2014-25245.
Повний текст джерелаАнотація:
The correct computation of steam subcooling, subsequent formation of nuclei and finally droplet growth is the basic prerequisite for a quantitative assessment of the wetness losses incurred in steam turbines due to thermal and inertial relaxation. The same basically applies for the prediction of droplet deposition and the resulting threat of erosion. Despite the fact that there are many CFD-packages that can deal with real-gas effects in steam flows, the accurate and reliable prediction of subcooling, condensation and wet steam flow in steam turbines using CFD is still a demanding task. One reason for this is the lack of validation data for turbines that can be used to assess the physical models applied. Experimental data from nozzle and cascade tests can be found in the open literature; however, this data is only partly useful for validation purposes for a number of reasons. With regard to steam turbine test data, there are some publications, yet always without any information about the turbine stage geometries. This publication is part of a two-part paper; whereas part 1 focuses on the numerical validation of wet steam models by means of condensing nozzle and cascade flows, the focus in this part lies on the comparison of CFD results of the turbine flow to experimental data at various load conditions. In order to assess the validity and reliability of the experimental data, the method of measurement is presented in detail and discussed. The comparison of experimental and numerical results is used for a discussion about the challenges in both modeling and measuring steam turbine flows, presenting the current experience and knowledge at ITSM.
7
Fraser, S., M. H. Attia, and M. O. M. Osman. "Control-Oriented Modeling of Thermal Deformation of Machine Tools Based on Inverse Solution of Time-Variant Thermal Loads With Delayed Response." In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-43036.
Повний текст джерелаАнотація:
With the new emerging technologies of high performance machining and the increasing demand for improved machining accuracy in recent years, the problem of thermal deformation of machine tool structures is becoming more critical than ever. The major problem in implementing real-time control systems is the difficulty of measuring the relative thermal displacement between the tool and the workpiece during machining. Therefore, the design of a generic multi-axis control system requires the development of control-based models to estimate the transient thermal load and the thermal deformation of the structure in real-time. To satisfy the stringent accuracy and stability requirements of the control system, a new inverse heat conduction problem IHCP solver is developed. This solution is capable of including the inertia effect and the delay in the thermal response, in order to accommodate situations where the measured points cannot be located near the heat source, which may be buried into the structure. Experimental validation of these models showed their inherent stability even when the temperature measurement are contaminated with random errors. The excellent computational efficiency of the integrated system, which is well suited for real-time control applications involving multi-dimensional structures, was achieved by incorporating an inverse numerical Laplace transformation procedure. The result also showed that the thermal deformation transfer function behaves as low-pass filters, and as such it attenuates the high frequency noise associated with temperature measurement error.
8
Asimopolos, Laurențiu, and Natalia-Silvia Asimopoli. "GEOLOGICAL AND GEOPHYSICAL STUDY FOR ELABORATION OF GEOTHERMAL MODEL IN ORADEA-BAILE FELIX AREA." In GEOLINKS International Conference. SAIMA Consult Ltd, 2020. http://dx.doi.org/10.32008/geolinks2020/b1/v2/12.
Повний текст джерелаАнотація:
Thermal methods consist of measuring thermal gradient and satellite data, which can be used to determine the Earth's surface temperature and thermal inertia of surficial materials, of thermal infrared radiation emitted at the Earth's surface. Thermal gradient measuring, with a knowledge of the thermal conductivity provides a measure of heat flow. Conditions that may increase or decrease and heat flow are influenced by hydrologic, topographic factors and anomalous thermal conductivity. Also, oxidation of sulphide bodies in-place or on waste deposits, if sufficiently rapid, can generate thermal anomalies, which can provide a measure of the amount of metal being released to the environment. The geothermal gradient on the territory of Romania, the increase of the temperature with the depth, has an average value of 2.5°-3°C/100m, which corresponds to a temperature of 100° C at 3000 m deep. There are many areas where the value of the geothermal gradient differs considerably from this average. For example, in areas where the rock plate suffered rapid dips and the basin was filled with sediment "very young "from a geological point of view, the geothermal gradient may be less than 1° C/100m. On the other hand, in other geothermal areas the gradient exceeds much this average. These areas are true underground thermal reservoirs of potentially high geothermal energy which under certain favourable conditions can be exploited to serve heating installations and domestic hot water systems. The geothermal prospecting for the entire territory of Romania, carried out by temperature measurements allowed the development of geothermal maps, highlighting the temperature distribution at different depths. Geophysical data obtained through various methods and geophysical modelling provide generalized and non-unique solutions to the geometry of underground geological relations as well as to the physical characteristics of different formations. The non-uniqueness of these models (solutions to the direct problem) arises from the impossibility of knowing the boundary conditions between different strata, which together with the propagation equations of the different fields (depending on the geophysical method used for the investigation of the basement) form the systems that offer the solutions of the model