Relevant bibliographies by topics / Gyroscopic platform

Academic literature on the topic 'Gyroscopic platform'

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Published: 30 May 2022
Last updated: 31 May 2022

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Journal articles on the topic "Gyroscopic platform"

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Wang, Ping, Jing Yang, and Jun Jun Yao. "Improvement and Realization of Miniature Flexible Gyro in the Photoelectric Platform." Advanced Materials Research 655-657 (January 2013): 697–700. http://dx.doi.org/10.4028/www.scientific.net/amr.655-657.697.

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Generally ,it was precession of flexible gyroscopic not gyroscopic nutation which was just considered in engineering design. However, in photoelectric stabilized platform, this nutation characteristics of angular position flexible gyro has been restricting the stabilized accuracy of platform seriously. In this paper, firstly the output characteristics of a miniature flexible gyro was measured by characteristic of gyroscopic motion, four main kinds of frequency components in output characteristics was analysed. The methods were realized in the miniature flexible gyroscope in the laboratory by adopting the two measures of the secondary trap circuit and improvement of torque component.Test results showed that, the improvements made nutation frequency of gyro and envelope at 40Hz converged fastly , and the output noise of gyro angular position was decayed to more than15dB. In the end, the gyro was applied to chariot photoelectric stabilized platform ,the isolation of platform and carrier got improved from 1~2mil to 0.3mil.
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Zamorsky, Alexander. "COMPACT ROTARY PLATFORM AS A UNIVERSAL LABORATORY STAND." Bulletin of Kyiv Polytechnic Institute. Series Instrument Making, no. 61(1) (June 30, 2021): 5–13. http://dx.doi.org/10.20535/1970.61(1).2021.237063.

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A single axis rotary platform is distinguished among the laboratory equipment for testing gyroscopic devices and systems and their sensitive elements. An overview of the design principles of industrially developed stands for the study of static and dynamic characteristics of gyroscopic devices and systems is provided. The scheme of design of the universal laboratory stand is suggested as the compact rotary platform for research of static and dynamic characteristics of micromechanical gyroscopes and accelerometers as sensors of angular speed. The physical components of such a stand and technical and technological problems of its practical implementation are reviewed. The proposed laboratory stand is considered as a cyberphysical system where computing components play a crucial role in determining the parameters of the system and the studied micromechanical sensors. For this purpose, in addition to the physical control loop of the electric drive to ensure the stability of the angular velocity of the platform, an independent measuring loop is considered for analytical determination of system parameters, including the studied micromechanical sensors. The versatility of the stand is ensured by solving the inverse problems, namely determining in the process of testing static and dynamic characteristics of the electric drive and measuring sensors that work on various physical principles. It is assumed that, in addition to solving practical problems of micromechanical sensors in the development of the appropriate information interface of the virtual device, a compact laboratory stand can be effectively used in the educational process during laboratory work in relevant disciplines of instrument making direction.
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Desmond, Cian, Jan-Christoph Hinrichs, and Jimmy Murphy. "Uncertainty in the Physical Testing of Floating Wind Energy Platforms’ Accuracy versus Precision." Energies 12, no. 3 (January 30, 2019): 435. http://dx.doi.org/10.3390/en12030435.

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This paper examines the impact on experimental uncertainty of introducing aerodynamic and rotor gyroscopic loading on a model multirotor floating wind energy platform during physical testing. In addition, a methodology and a metric are presented for the assessment of the uncertainty across the full time series for the response of a floating wind energy platform during wave basin testing. It is shown that there is a significant cost incurred in terms of experimental uncertainty through the addition of rotor thrust in the laboratory environment for the considered platform. A slight reduction in experimental uncertainty is observed through the introduction of gyroscopic rotor loading for most platform responses.
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Fenu, Beatrice, Valentino Attanasio, Pietro Casalone, Riccardo Novo, Giulia Cervelli, Mauro Bonfanti, Sergej Antonello Sirigu, Giovanni Bracco, and Giuliana Mattiazzo. "Analysis of a Gyroscopic-Stabilized Floating Offshore Hybrid Wind-Wave Platform." Journal of Marine Science and Engineering 8, no. 6 (June 15, 2020): 439. http://dx.doi.org/10.3390/jmse8060439.

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The energy innovation scenario sees hybrid wind-wave platforms as a promising technology for reducing the variability of the power output and for the minimization of the cost of offshore marine renewable installations. This article presents a model that describes the installation of a 5 MW wind turbine on a floating platform designed by Fincantieri and equipped with gyroscopic stabilization. The use of gyros allows for the delivery of platform stabilization by damping the wave and wind induced motion on the floater and at the same time producing extra power. Shetland Island was chosen as the reference site because of its particularly harsh weather. Final results show that the total production of power in moderate and medium climate conditions is considerable thanks to the installation of the gyro, together with a significant stabilization of the platform in terms of pitching angle and nacelle acceleration.
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Votrubec, Radek, and Michal Sivčák. "The Correction and Compensation Motors for the Gyroscopic Stabilizer." Solid State Phenomena 164 (June 2010): 145–48. http://dx.doi.org/10.4028/www.scientific.net/ssp.164.145.

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We have a prototype of platform that is stabilized by means of gyroscopes. Pneumatic motors are used for moving with frames. It was necessary to identify torque characteristics of these motors. It rests on control of pressure in motor and measurement of its force.
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Han, Wei, Xiongzhu Bu, Yihan Cao, and Miaomiao Xu. "SAW Torque Sensor Gyroscopic Effect Compensation by Least Squares Support Vector Machine Algorithm Based on Chaos Estimation of Distributed Algorithm." Sensors 19, no. 12 (June 20, 2019): 2768. http://dx.doi.org/10.3390/s19122768.

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As this study examined the issue of surface acoustic wave (SAW) torque sensor which interfered in high rotational speed, the gyroscopic effect generated by rotation was analyzed. Firstly, the SAW coupled equations which contained torque and rotation loads were deduced, and the torque calculation error caused by rotation was solved. Following this, the hardware of the SAW gyroscopic effect testing platform and the turntable experiment were designed to verify the correctness of the theoretical calculation. Finally, according to the experimental data, the gyroscopic effect was compensated by multivariate polynomial fitting (MPF), Gaussian processes regression (GPR), and least squares support vector machine algorithms (LSSVM). The comparison results showed that the LSSVM has the obvious advantage. For improving the function of LSSVM model, chaos estimation of distributed algorithm (CEDA) was proposed to optimize the super parameters of the LSSVM, and numerical simulation results showed that: (1) CEDA is superior to traditional estimation of distributed algorithms in convergence speed and anti-premature ability; (2) the performance of CEDA-LSSVM is better than genetic algorithms (GA)-LSSVM and particle swarm optimization (PSO)-LSSVM. After compensating by CEDA-LSSVM, the magnitude of the torque calculation relative error was 10−4 in any direction. This method has a significant effect on reducing gyroscopic interference, and it lays a foundation for the engineering application of SAW torque sensor.
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Zawiski, R., and M. Błachuta. "Modelling and optimal control system design for quadrotor platform – an extended approach." Bulletin of the Polish Academy of Sciences Technical Sciences 62, no. 3 (September 1, 2014): 535–50. http://dx.doi.org/10.2478/bpasts-2014-0058.

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Abstract This article presents the development of a mathematical model of a quadrotor platform and the design of a dedicated control system based on an optimal approach. It describes consecutive steps in development of equations forming the model and including all its physical aspects without commonly used simplifications. Aerodynamic phenomena, such as Vortex Ring State or blade flapping are accounted for during the modelling process. The influence of rotors’ gyroscopic effect is exposed. The structure of a control system is described with an application of the optimal LQ regulator and an intuitive way of creating various flight trajectories. Simulation tests of the control system performance are conducted. Comparisons with models available in the literature are made. Based on above, conclusions are drawn about the level of insight necessary in creation of control-oriented and useable model of a quadrotor platform. New possibilities of designing and verifying models of quadrotor platforms are also discussed.
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Mirzajani Darestani, Mohammad Sadegh, Seyed Zeynolabedin Moussavi, and Parviz Amiri. "A laboratory method for obtaining two degrees of freedom gyro-scopic stabilizer transfer function." International Journal of Engineering & Technology 5, no. 4 (September 17, 2016): 102. http://dx.doi.org/10.14419/ijet.v5i4.6439.

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Obtaining transfer function of electrical, mechanical, etc. systems can provide this possibility for the researchers to investigate the behav-iours of desired systems based on different inputs in various working circumstances without need to laboratory equipment which it results in lower consumption of time and expense. The aim of current research is obtaining the existing gyroscopic stabilizer transfer function. The way we used in this article is the newest laboratory way for obtaining transfer function of gyroscopic stabilizers. This aim is achieved by using laboratory equipment such as a two degrees of freedom gyro stabilized platform that an imaging system is installed on it as the load, target simulator table with one degree of freedom, and electronic conversion board of RS488 to RS232 serial communication standard, etc. An input which excites all modes (search and track) of two degrees of freedom gyro stabilized platform is introduced to under test system and the system behaviour toward the introduced input is saved and finally the transfer function of existing two degrees of freedom gyro stabilized platform is obtained using system identification toolbox in MATLAB. At the end of this article, the step response of transfer function obtained through the desired experiment in the laboratory compared with the step response obtained through simulations that a %10 difference between them is observed.
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Rubio, Francisco R., Manuel G. Ortega, Francisco Gordillo, and Manuel Vargas. "Application of position and inertial-rate control to a 2-DOF gyroscopic platform." Robotics and Computer-Integrated Manufacturing 26, no. 4 (August 2010): 344–53. http://dx.doi.org/10.1016/j.rcim.2009.11.012.

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Veyna, Uriel, Sergio Garcia-Nieto, Raul Simarro, and Jose Vicente Salcedo. "Quadcopters Testing Platform for Educational Environments." Sensors 21, no. 12 (June 16, 2021): 4134. http://dx.doi.org/10.3390/s21124134.

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This work focuses on the design and construction of an experimental test bench of three degrees of freedom with application in educational environments. It is constituted by a gyroscopic structure that allows the movements of a quadcopter to analyze the control systems. In this context, the main features of the mechanical and electronic design of this prototype are described. At the same time, the main characteristics with respect to existing platforms are highlighted in aspects such as: system autonomy, cost, safety level, operation ranges, experimental flexibility, among others. The possible controller design approaches for quadcopter stabilization can extend to many basic and advanced techniques. In this work, to show the operation and didactic use of the platform, the development of the controller for tilt angle stabilization under two different approaches are presented. The first approach is through PID control, oriented for undergraduate students with basic level in control theory. The second approach is by means of State Feedback, oriented to students with more advanced level in this field. The result of this work is an open test bench, enabled for the experimentation of control algorithms using Matlab-Simulink.
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Dissertations / Theses on the topic "Gyroscopic platform"

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Лясковець, Юрій Олександрович. "Система керування гіроскопічними транспортними платформами." Bachelor's thesis, КПІ ім. Ігоря Сікорського, 2020. https://ela.kpi.ua/handle/123456789/40928.

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Пояснювальна записка дипломного проекту складається з семи розділів та містить 60 с. тексту, 29 рисунків, 2 таблиці, посилання на 27 літературних джерел, 3 додатки та 4 конструкторських документи Об’єктом розробки є система керування гіроскопічними транспортними платформами. Метою даного проєкту є розширення використання дорожнього покриття за рахунок забезпечення руху гіроплатформ. У дипломному проєкті розроблено цифрову модель системи керування гіроскопічними транспортними платформами. Розроблено структурну та функціональну схеми, розроблено математичну модель, синтезовано LQR-регулятор. Зроблено розрахунки необхідної потужності для певних елементів системи керування. Моделювання системи здійснювалося з використанням пакету прикладних програм MATLAB/Simulink. Отримані результати можуть бути корисними для розробки та моделювання поведінки подібних систем.
The project consists of 7 chapters and contains 60 p. of text, 29 figures, 2 tables, references to 27 sources of literature, 3 appendices and 4 design documents. The object of development is a control system for gyroscopic transport platforms. The purpose of this project is to expand the use of the road surface by ensuring the movement of gyro platforms. In the diploma project a digital model of the control system of gyroscopic transport platforms was developed. The structural and functional schemes were developed, the mathematical model was developed, the LQR-regulator was synthesized. The calculations of the required power for certain elements of the control system were made. The system was simulated using the MATLAB/Simulink application package. The results obtained can be useful for developing and modeling the behavior of such systems.
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Redwood, Benjamin Philip. "Analysis, design, optimisation and testing of a gyroscopically stabilized platform." Thesis, University of Canterbury. Mechanical Engineering, 2014. http://hdl.handle.net/10092/9565.

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Gyroscopic stabilization can be used to maintain an otherwise unstable body in an upright position. Devices equipped with gyroscopes can balance upon a small area or point without falling over when the gyroscopic stabilizing force is greater than a rotational force or moment from an out-of-balance load that causes the device to tip. A new concept for a gyroscopically stabilized platform has been proposed in the form of a schematic diagram. The proposed system comprises of four interconnected gyroscopes that react to the tipping of an inherently unstable external body. The purpose of this research is to evolve a design for, and establish the feasibility of building the proposed stable platform using available materials and technology. If feasible, the gyroscopically stabilized platform will be made at the most practical and economic size. Louis Brennan developed a 37 tonne monorail that was maintained in the upright position with two 3 tonne counter rotating gyroscopes. The Brennan monorail is analysed to better understand the behaviour of a similar coupled gyroscopic stabilization system. The reactions between the components that maintain the monorail in the stable position are studied and comparisons are made between the proposed stable platform and the Brennan system. A mathematical analysis of the proposed system is presented. The equations of motion for the system are derived using the Lagrangian Formalism. The characteristic equation of the system is then determined and from this a set of stability conditions imposed on the design of the physical parameters of the stable platform. The general solutions to the equations of motion are then derived. Expressions that model the behaviour of two of the variables that describe the motion of the stable platform are determined. A systematic approach is adopted for establishing a new concept for the proposed system. Testing of the initial stable platform prototype (Prototype A) showed the system did not behave as intended. The platform was optimised further and this resulted in a second prototype, Prototype B. Prototype B exhibiting the desired oscillatory motion about the vertical of the platform. Predictions made using the mathematical model are compared with empirical results. The mathematical model was found to be an accurate method for predicting the response of the stable platform.
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Bystam, Fredrik. "Improving motion tracking using gyroscope data in Augmented Reality applications." Thesis, KTH, Datorseende och robotik, CVAP, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-166186.

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As commissioned by Bontouch AB, this project contains the attempt to create an Augmented Reality application for smartphones, where a parcel is visualised in order for a user to get a comprehensive image of the parcel size. The main focus of the project was to create an eectively running en- gine that can process images for computer vision, in order to determine the pose of the smartphone camera. The experi- ment explored the possibilities of using gyroscope measure- ments between input images in order to formulate valid as- sumptions of upcoming images using homographies. These assumptions were meant to unburden the computer vision engine, creating very high performance. The ultimate goal of the engine was to track the motion of a known reference object in the image, with high precision. The proposed method performed adequately, improving reliability of the motion tracking algorithms. The resulting mobile application, run on an iPhone 5S, could perform camera pose estimation at up to 60 times per second, at a video camera feed resolution of 1280x720 pixels. This high performance resulted in a very stable rendition of the parcel.
Som ett uppdrag från Bontouch AB innehåller det här pro- jektet ett försök att skapa en Augmented Reality-applikation för smartphones, där postpaket ska visualiseras för att ge användare en förstärkt bild av paketets storlek. Huvudfo- kus i projektet var att bygga en eektiv motor som kan behandla bilder för datorseende, för att beräkna positionen och riktningen på mobilkameran. Experimentet utforskade möjligheterna för att använda gyroskopdata mellan bilder för att formulera giltiga antaganden hos kommande bilder med hjälp av homografier. Dessa antaganden vad ämna- de att avlasta motorn för datorseende, för att åstadkomma hög prestanda. Målet var att motorn skulle följa rörelsen hos ett givet referensobjekt i bilden, och att göra det med hög precision. Den föreslagna metoden presterade tillräckligt, och för- bättrade pålitligheten hos algoritmerna för att följa objek- tets rörelser. Mobilapplikationen som byggdes, och kördes på iPhone 5S, kunde beräkna kamerans position of riktning upp till 60 gånger per sekund, när videokameran försåg mo- torn med bilder med 1280x720 pixlars upplösning. Den höga prestandan resulterade i en väldigt stabil bild av paketet.
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Bredenkamp, Adolf Friedrich Ludwig. "Development and control of a 3-axis stabilised platform." Thesis, Link to the online version, 2007. http://hdl.handle.net/10019/380.

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Vácha, Lukáš. "Stabilizační 2D plošina pro digitální obrazový snímací systém." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2012. http://www.nusl.cz/ntk/nusl-219459.

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This diploma thesis deals with design and realization of control board with controlling program for stabilization platform application. Thesis is splitted in to six parts. In first part of thesis are summarized required parameters and properties of proposed system together with explanation of necessary theoretical basics. In second part of thesis is made analysis of sensors which are designated for sensing necessary magnitudes. Namely then magnetometer, accelerometer, gyroscope. For every sensor is there made analysis of influence caused by parasitic effects. In conclusion of second part is made choice of concrete sensors by choosing sensory module. Third part deals with conception of mechanical solution. Fourth part of thesis deals with design and construction of control board and also with description of circuit functional blocks. This is followed with fifth part which describing program equipment of board with setting up sensory module. In last part of thesis are described conclusions of testing.
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Votava, Martin. "Platforma pro vývoj tří-rotorové helikoptéry." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2012. http://www.nusl.cz/ntk/nusl-236581.

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The goal of this master's thesis is design and built of platform for three-rotor helicopter development. The helicopter is also known as tricopter. Theoretical part describes principle of tricopter's flight and stabilization. There is also described basics inertial navigation system and sensors which are required for correct functionality. Practical part is dedicated to development of tricopter's frame, schematics diagram, communication between subsystems and stabilization system development. Flight stablization system is base on ATmega128A an using PID Controller. In the end is described testing of developed platform.
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Tydor, Maximilián. "Univerzální senzorová testovací platforma." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2015. http://www.nusl.cz/ntk/nusl-221234.

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This document deals with issues of testing semiconductor inertial sensors like gyroscopes and accelerometers, but also other sensors like magnetometers, inclinometers and others for aviation navigation purposes where strict requirements cover every system. The goal of this thesis is to create modular test platform for testing wide variety of sensors in different combinations under variable circumstances. The development covers mechanical design, electrical design – hardware and also control algorithm – software.
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Řezáč, Martin. "Parametrizovatelný hudební nástroj pro mobilní platformy." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2014. http://www.nusl.cz/ntk/nusl-412901.

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The goal of this thesis is to create an application, which will be primarily used as three-axis parametrizable musical instrument, respectively a modifi ed MIDI controller, suitable for Android devices. Firstly, several products, which are available on the market, are reviewed and the reader is introduced to the problematics of audio synthesis, available technologies and typical Android device potential. The next chapter is dedicated to application design. Few designs are mentioned with focus on the chosen design concept. A part of this chapter is also a speci cation of the original concept, its implementation and advantages/disadvantages. The next part is dedicated to implementation and optiomalization of some of the critical points. Also the tests are evaluated including a survey about application usability. At the end, the whole work is concluded and the further development is outlined.
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Li, Keng Wei, and 李耿維. "The Development of Gyroscope Stabilized Platform." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/71837790667473092199.

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碩士
國立雲林科技大學
機械工程系
103
The purpose of this thesis is to develop a self-stabilizing platform, that when disturbed by rotations or displacements, can adjust itself with its compensating system, to prevent the errors caused by the disturbing rotations or displaces. There are two components to the self-stabilizing platform, the simulating component and the compensating component. The functions of the simulating component are to simulate three dimensional angle-disturbances and two dimensional displacement -disturbances, two one-dimensional displacements with encoder each. The compensating component uses two servos to compensate for when the platform was disturbed by rotations and distances. The inertial measurement unit (IMU) is used to obtain the disturbed-angles and the encoders on displace-platform is used to obtain the displacement ,then using a computer calculated compensating-algorithm ,solving the error from the platform which was disturbed angles or distances. In this thesis, the Homogeneous Transformation Matrix, usually used to be applied in the development of robots, is used to simulate when the self-stabilizing platform was disturbed by rotations or distances, and to solve the compensating-equations to get two compensating-angles, and then to send two angle-signals to servo-motors to compensate for the error caused by the rotations and distance disturbances. According to the experience , the frequency-width of compensating component is 1.43Hz, and the error is in 4.67%. Keywords：Gyroscope、Stabilized-platform、Robotics、Encoder、Servo、Homogeneous Transformation Matrix
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Book chapters on the topic "Gyroscopic platform"

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Votrubec, R. "Control System of One-Axis Vibration-Insulation Platform with Gyroscopic-Stabilizer." In Mechatronics 2013, 733–39. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-02294-9_92.

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Alias, Abdul Rashid, Mohd Sofian Alias, Iskandar Zulkarnain Shamsuddin, Raja Abdullah Raja Ahmad, and Siti Norul Huda Sheikh Abdullah. "Measure the Ability and Limitation of Gyroscope, Acceleration and Gyro-accelaration for Stabilized Platform." In Intelligent Robotics Systems: Inspiring the NEXT, 405–15. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-40409-2_34.

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Keymeulen, Didier, Michael I. Ferguson, Wolfgang Fink, Boris Oks, Chris Peay, Richard Terrile, Yen Cheng, Dennis Kim, Eric MacDonald, and David Foor. "Hardware Platforms for MEMS Gyroscope Tuning Based on Evolutionary Computation Using Open-Loop and Closed-Loop Frequency Response." In Evolvable Systems: From Biology to Hardware, 215–26. Berlin, Heidelberg: Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/11549703_21.

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Conference papers on the topic "Gyroscopic platform"

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Guillén-Torres, Miguel Á., Maan Almarghalani, Elie H. Sarraf, Michael Caverley, Nicolas A. F. Jaeger, Edmond Cretu, and Lukas Chrostowski. "Silicon photonics characterization platform for gyroscopic devices." In Photonics North 2014, edited by Steve MacLean and David V. Plant. SPIE, 2014. http://dx.doi.org/10.1117/12.2075051.

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Obeyesekera, Ranjith K. "FEA Models to Identify Possible Fatigue Failures on a Large Diameter Turbine, Installed on a Floating Platform." In ASME 2004 23rd International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2004. http://dx.doi.org/10.1115/omae2004-51051.

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The paper discusses the influence of body loads and dynamic loads on the surface of a large diameter turbine. In this study the corrosion fatigues due to the sea environment are not considered. The study shows that increasing the body loads decrease the endurance limits of the turbine. The computational FEA study reveals that endurance is significantly effected the gyroscopic loads at lower speeds of the turbine. In this study the floating platform is a large hollowed floating chamber, both sides of which are rigidly fixed to the two parabolic walls and floats as a single unit. The turbine is installed on the deck of the floating device and the endurance stresses of which are influenced by the dynamic loads. Dynamic loads are classified as fluctuating loads and repeated loads. In this study fluctuating loads mainly depend on the variable pitch determined by the sea waves. These are also known as gyroscopic loads. The repeated loads are derived from the body loads. The magnitude of the gyroscopic load depends on sea wave characteristics, mechanical characteristics of the floating device, and the kinematics of the turbine. The FEA model study shows that an increase of the body loads lowers the factor of safety. The study compares the gyroscopic loads and the body loads of the turbine against the endurance stresses. Computational analysis shows that modifying the body loads within the gyroscopic stress environment influences the area of low fatigues.
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Rios, Oscar, and Hidenori Murakami. "A Mathematical Model of an Active Gyroscopic Roll Stabilizer Using the Moving Frame Method." In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-51157.

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Large offshore renewable energy investments require the use of maintenance boats to keep them in operable conditions. Unfortunately, due to rough seas in some of the project locations, the transferring of crew members from vessel to turbine or platform is no easy task. Thus, the research presented is focused at further looking into add on stability systems for marine vessels to further ease the process of offshore platform maintenance and crew member safety. The rolling and pitching of ships and boats induced by the ocean waves results in undesirable motion. In an effort to increase the stability of the deck/platform and human comfort and safety, various add-on stability systems have been developed. Of interest in the research presented are internal active systems, specifically the active gyroscopic stabilizer. Previous research and industrial use of active gyroscopic roll stabilizers has shown and proven the effectiveness of the system to reduce rolling motion. The research presented here is focused on developing a more detailed mathematical analysis of a marine vessel installed with active gyroscopic roll stabilizer(s). Through the use of the moving frame method developed by the second author, a novel approach has been developed to derive a mathematical model for two different cases: 1) a marine vessel with a single gyroscopic roll stabilizer and 2) a marine vessel with two gyroscopic roll stabilizers. The moving frame method allows for a systematic derivation despite the increase in complexity of the system as the number of stabilizers is increased. Lastly, the nonlinear equations of motion of a ship with a gyroscopic roll stabilizer are derived.
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Okabe, Eduardo P., Daniel L. Miletto, Milton S. Misuta, and José Luiz P. Brittes. "Simulation of a Pole Saw Assisted by a Gyroscopic Effect Device." In ASME 2021 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/detc2021-70112.

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Abstract Linemen performing pruning activity on vegetation entangled with overhead lines and handling a pole saw is a physically strenuous and risky job. It is a major cause of linemen musculoskeletal disorders (MSD) and others injuries, with more than one type of accumulative musculoskeletal injury like backbone, shoulder, neck and wrists. Although assisted robotic tools could reduce ergonomic issues, it also impairs the quality of work; efficiency and quality require human direct cutting due to a huge imponderability of each particular action on each particular job due different kind of vegetation and shapes. The best approach should be to aid linemen handling the pole saw during pruning. So, as a first step to develop and implement a gyroscopic platform for pruning pole saw, this paper compares and presents a simulation of a regular pole saw with a pole saw assisted by a gyroscopic device using kinematic data obtained by the motion capture system. Kinematic data obtained connects to dynamic simulation, which makes available pole saw control and kickback analysis. Simulation outcome shows that gyroscopic assistance on pole saw has great potential to mitigate harmful pruning dynamic forces for lineman, with no impact on productivity and work quality.
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Nyland, Joakim, Håkon Teigland, and Thomas J. Impelluso. "Use of the Moving Frame Method in Dynamics to Model Gyroscopic Control of Small Crafts at Sea: Theory — Part 1." In ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-70108.

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This paper presents new method in dynamics — the Moving Frame Method (MFM) — and uses it to address a challenge faceing Norwegian shipping. Large offshore renewable energy investments require the use of maintenance boats to keep them in operable conditions. Unfortunately, due to rough seas in some project locations, the transferring of crew members from vessel to turbine or platform is fraught with safety concerns. These concerns can be alleviated by controlling the motion of the transfer vessel. This research studies an add-on stability system for marine vessels to ease the process of offshore platform maintenance and crew member safety. Specifically, this research concerns an internal active system — an active gyroscopic stabilizer — and a more powerful method of theoretical and computational mechanics. This paper derives the equations of motion of a model system equipped with dual gyroscopic stabilizers, using the MFM. The equations of motion are numerically solved to obtain a numerical simulation. The method exploits a variational principle with a restricted variation of the angular velocity. The MFM simplifies dynamics, enables a consistent notation, from 2D to 3D analysis and exploits matrix algebra in lieu of the vector cross product. Finally, in a companion paper to this one, the mathematical model and the numerical simulation is verified with experiments conducted in a large-scale wave tank.
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Nematbakhsh, Ali, David J. Olinger, and Gretar Tryggvason. "A Nonlinear Computational Model for Floating Wind Turbines." In ASME 2012 Fluids Engineering Division Summer Meeting collocated with the ASME 2012 Heat Transfer Summer Conference and the ASME 2012 10th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/fedsm2012-72271.

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The dynamic motion of floating wind turbines is studied using computational simulations. The full three-dimensional Navier-Stokes equations are solved on a regular structured grid, using a level set method for the free surface and modified immersed boundary method to model the turbine platform. The tethers, the tower, the nacelle and the rotor weight are include using reduced order dynamic models, resulting in an efficient numerical approach. Wind is modeled as a constant thrust force. Other aerodynamic loading, rotor gyroscopic effects, and aeroelastic effects are not considered in the current study. The response of a tension leg platform to moderate amplitude waves is examined. By using the current approach, nearly all the nonlinear and viscose effects can be considered while keeping the computational cost reasonable. The model is applied to a Tension Leg Platform (TLP) consisting of a ballasted cylindrical tank.
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Abedi, Maryam, and Tian Jin. "Novel gyroscopic mounting for crystal oscillator (payload) applied in high dynamic host vehicle (platform) to improve its output stability." In 2015 Joint Conference of the IEEE International Frequency Control Symposium & the European Frequency and Time Forum (FCS). IEEE, 2015. http://dx.doi.org/10.1109/fcs.2015.7138809.

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Tan, Lei, Tomoki Ikoma, Yasuhiro Aida, and Koichi Masuda. "Mean Wave Drift Force on a Barge-Type Floating Wind Turbine With Moonpools." In ASME 2021 40th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/omae2021-62241.

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Abstract The barge-type foundation with moonpool(s) is a promising type of platform for floating offshore wind turbines, since the moonpool(s) could improve the hydrodynamic performance at particular frequencies and reduce the costs of construction. In this paper, the horizontal mean drift force and yaw drift moment of a barge-type platform with four moonpools are numerically and experimentally investigated. Physical model tests are carried out in a wave tank, where a 2MW vertical-axis wind turbine is modelled in the 1:100 scale. By varying the rotating speed of the turbine and the mass of the blades, the gyroscopic effects due to turbine rotations on the mean drift forces are experimentally examined. The wave diffraction and radiation code WAMIT is used to carry out numerical analysis of wave drift force and moment. The experimental results indicate that the influence of the rotations of a vertical-axis wind turbine on the sway drift force is generally not very significant. The predictions by WAMIT are in reasonable agreement with the measured data. Numerical results demonstrate that the horizontal mean drift force and yaw drift moment at certain frequencies could be reduced by moonpool(s).
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Collu, Maurizio, Michael Borg, Andrew Shires, and Feargal P. Brennan. "FloVAWT: Progress on the Development of a Coupled Model of Dynamics for Floating Offshore Vertical Axis Wind Turbines." In ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/omae2013-10717.

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In the present article, progress on the development of an aero-hydro-servo-elastic coupled model of dynamics for floating Vertical Axis Wind Turbines (VAWTs) is presented, called FloVAWT (Floating Vertical Axis Wind Turbine). Aerodynamics is based on Paraschivoiu’s Double-Multiple Streamtube (DMST) model [1] [2], relying on blade element momentum (BEM) theory, but also taking into account three-dimensional effects, dynamic stall, and unsteady wind profiles and platform motions. Hydrodynamics is modelled with a time domain seakeeping model [3], based on hydrodynamic coefficients estimated with a frequency analysis potential method. In this first phase of the research program, the system is considered a rigid body. The mooring system is represented through a user defined force-displacement relationship. Due to the lack of experimental data on offshore floating VAWTs, the model has initially been validated by taking each module separately and comparing it against known experimental data, showing good agreement. The capabilities of the program are illustrated through a case study, giving an insight on the relative importance of aerodynamics loads and gyroscopic effects with respect to hydrodynamic load effects.
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Olivieri, A., A. Francescutto, E. F. Campana, and F. Stern. "Parametric Roll: Highly Controlled Experiments for an Innovative Ship Design." In ASME 2008 27th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2008. http://dx.doi.org/10.1115/omae2008-57402.

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The present work is focused on ship’s parametric roll. In particular, a series of controlled experiments have been performed in order to obtain repeatable results both for the inception and the roll amplitude in parametric roll condition. The experiments have been performed for an innovative ship design (a tumblehome shape) in a towing tank provided by a flap-type wave maker. The model was tested in 3 DoF conditions, being roll, pitch and heave motions free and surge, sway and yaw restrained. The experimental work, which is the subject of the present paper, is part of cooperative research project between the IIHR (Iowa Institute of Hydraulic Research), the University of Trieste and the Italian ship model basin (INSEAN) (1, 2). All the experiments have been carried out in head waves at the INSEAN basin n. 2. The model motions were measured both by an optical motion tracker (Krypton) and a gyroscopic platform (MOTAN). Tests were carried out for three different metacentric heights in a range of speeds. Roll decay tests as a function of forward speed were performed before every experiment in waves in order to determine the natural roll frequency and the roll decay rate. The head waves experiments showed parametric roll excitation for different metacentric heights, wave steepness and Froude number. The repeatability of the obtained results, allows to use them as a benchmark for both CFD codes and theoretical models. This will be the subject of a future work, which is at present in preparation and involves other international collaborations beyond the ones listed here.
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