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Journal articles on the topic 'Modular propulsion system'

Author: Grafiati

Published: 4 June 2021

Last updated: 9 February 2022

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1

Yan, Zheng, Xiao Hui Peng, Yu Qiang Cheng, and Jian Jun Wu. "Modeling and Simulation of System Dynamics for Spacecraft Propulsion System." Applied Mechanics and Materials 229-231 (November 2012): 2112–16. http://dx.doi.org/10.4028/www.scientific.net/amm.229-231.2112.

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The spacecraft propulsion system is used for geosynchronous orbit transfer, three-axis stabilization and station-keeping. In order to investigate the system dynamics of spacecraft propulsion system with complex pressurization pipelines and propellant supply pipelines, a modular and extensible simulator UPSSim was developed. The pressurant pipelines were separated into several nodes, each node used lumped parameter model; while the propellant feed pipelines used distributed parameter model. Heat transfer between components and environment was also taken into account. The model accurately predic

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2

Igenbergs, E., and M. Kirschner. "A modular propulsion system for the interorbital vehicle." Acta Astronautica 15, no. 8 (1987): 545–50. http://dx.doi.org/10.1016/0094-5765(87)90154-8.

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Adami, Amirhossein, Mahda Mortazavi, and Mehran Nosratollahi. "Multi-modular design optimization and multidisciplinary design optimization." International Journal of Intelligent Unmanned Systems 3, no. 2/3 (2015): 156–70. http://dx.doi.org/10.1108/ijius-01-2015-0001.

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Purpose – For complex engineering problems, multidisciplinary design optimization (MDO) techniques use some disciplines that need to be run several times in different modules. In addition, mathematical modeling of a discipline can be improved for each module. The purpose of this paper is to show that multi-modular design optimization (MMO) improves the design performances in comparison with MDO technique for complex systems. Design/methodology/approach – MDO framework and MMO framework are developed to optimum design of a complex system. The nonlinear equality and inequality constrains are con

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Yan, Zheng, Xiao Hui Peng, Yu Qiang Cheng, and Jian Jun Wu. "System Dynamic Characteristic Simulation of Spacecraft Propulsion System Based on AMESim." Advanced Materials Research 605-607 (December 2012): 679–83. http://dx.doi.org/10.4028/www.scientific.net/amr.605-607.679.

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In order to investigate the dynamic characteristic of the spacecraft propulsion system, numerical simulation was carried out based on the modular and extensible simulation model UPSSim. The model accurately predicts the global behavior of the spacecraft propulsion system in the priming and shutdown process, and also correctly describes the transient behavior of the subsystems. Due to the distributaries of the attitude control thruster supply pipelines, the propellant flow fluctuation attenuates rapidly in the priming process and the waterhammer peak pressure of main engine supply pipelines dec

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Campora, U., and M. Figari. "Numerical simulation of ship propulsion transients and full-scale validation." Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment 217, no. 1 (2003): 41–52. http://dx.doi.org/10.1243/147509003321623130.

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The paper describes a mathematical model for the dynamics simulation of ship propulsion systems. The model, developed in a MATLAB-SIMULINK software environment, is structured in modular form; the various elements of the system are described as individuals blocks (hull, prime mover, gear, waterjet, etc.) and linked together to take their interactions into account. In this way it is possible to characterize the dynamic behaviour of both the single component and the whole propulsion plant. The model may be used to analyse the system response at off-design and transient conditions. In particular,

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Nosseir, Ahmed E. S., Angelo Cervone, and Angelo Pasini. "Modular Impulsive Green Monopropellant Propulsion System (MIMPS-G): For CubeSats in LEO and to the Moon." Aerospace 8, no. 6 (2021): 169. http://dx.doi.org/10.3390/aerospace8060169.

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Green propellants are currently considered as enabling technology that is revolutionizing the development of high-performance space propulsion, especially for small-sized spacecraft. Modern space missions, either in LEO or interplanetary, require relatively high-thrust and impulsive capabilities to provide better control on the spacecraft, and to overcome the growing challenges, particularly related to overcrowded LEOs, and to modern space application orbital maneuver requirements. Green monopropellants are gaining momentum in the design and development of small and modular liquid propulsion s

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Xiao, Nengqi, Ruiping Zhou, and Xiang Xu. "Vibration of diesel-electric hybrid propulsion system with nonlinear component." Journal of Vibration and Control 24, no. 22 (2018): 5353–65. http://dx.doi.org/10.1177/1077546317753010.

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The lumped parameter method is used to model the components of a marine diesel-electric hybrid propulsion system. Modular modeling and five basic models of torsional vibration are used to establish the torsion of the diesel-electric hybrid propulsion system with a nonlinear components vibration mathematical model. In order to include the nonlinear parts of the marine diesel-hybrid propulsion shafting torsional vibration system characteristics, by combining the perturbation method with the advantages and disadvantages of the harmonic method, a perturbation-harmonic method is presented to solve

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Cui, Ze, Zeng Jun Han, Hong Wei Pan, Yao Hua Wang, and Xiao Qing Hua. "The Optimization Design of a Propulsion Module for a Mini-ROV." Advanced Materials Research 403-408 (November 2011): 2795–99. http://dx.doi.org/10.4028/www.scientific.net/amr.403-408.2795.

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For a mini remotely operated vehicle (mini-ROV), the performance of the propulsion system has a direct impact on its underwater running and operation. A proper designed propulsion module will improve the maneuverability and controllablity of the mini ROV. In this paper, we propose a kind of propulsion modular series taking lower drag, higher efficiency and lighter weight as design objectives. Simulation and experiment results are also presented to illustrate performance of a specific designed thruster.

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Matlock, Jay, Stephen Warwick, Philipp Sharikov, Jenner Richards, and Afzal Suleman. "Evaluation of energy efficient propulsion technologies for unmanned aerial vehicles." Transactions of the Canadian Society for Mechanical Engineering 43, no. 4 (2019): 481–89. http://dx.doi.org/10.1139/tcsme-2018-0231.

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The transition to cleaner, more efficient and longer-endurance aircraft is at the forefront of research and development in air vehicles. The focus of this research is to experimentally evaluate hybrid propulsion and energy harvesting systems in unmanned aerial vehicles (UAVs). Hybrid systems offer benefits over conventional gasoline and electric systems including lower environmental impacts, reduced fuel consumption, redundancy, and distributed propulsion. Additional energy efficiency can be achieved by harvesting some of the thermal energy of the exhaust gases. The development and experimenta

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Machado, Leonardo, Jay Matlock, and Afzal Suleman. "Experimental evaluation of a hybrid electric propulsion system for small UAVs." Aircraft Engineering and Aerospace Technology 92, no. 5 (2019): 727–36. http://dx.doi.org/10.1108/aeat-06-2019-0120.

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Purpose This paper aims to experimentally evaluate the performance of a parallel hybrid propulsion system for use in small unmanned aerial vehicles (UAVs). Design/methodology/approach The objective is to combine all the individual components of the hybrid electric propulsion system (HEPS) into a modular test bench to characterize the performance of a parallel hybrid propulsion system, and to evaluate a rule-based controller based on the ideal operating line concept for the control of the power plant. Electric motor (EM) designed to supplement the power of the internal combustion engine (ICE) t

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Krasoń, Wiesław, and Paweł Sławek. "Design and pre-testing of a mobile modular floating platform with adjustable displacement." Mechanik 90, no. 11 (2017): 1075–80. http://dx.doi.org/10.17814/mechanik.2017.11.185.

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Contemporary emergency crossing systems used by military and crisis service systems are constantly evolving and have to meet many requirements. As a result, modifications to the prototype pontoon bridge segment with adjustable displacement, are proposed. The floating cradle system has been upgraded, additional displacement modules have been supported and a number of solutions including floating equipment and fittings have been added. Modifications and developed constructions allow not only to combine traditional ribbon bridges, but also mobile floating platforms with self propulsion. Assumptio

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12

Guan, Cong, Hui Chen, and Hai Bo Gao. "Simulation of Fuzzy PID Control for a Large Containership Speed at Slow Steaming Condition." Applied Mechanics and Materials 713-715 (January 2015): 734–38. http://dx.doi.org/10.4028/www.scientific.net/amm.713-715.734.

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In this paper, a cycle mean value engine model was built, and the ship propulsion system model was developed by combining the engine model with propeller and ship model following a modular approach in MATLAB/Simulink environment. In addition, the fuzzy PID control theory was investigated and applied in the ship speed intelligent control system under different disturbance circumstances with emphasis at slow steaming condition. Finally, the simulation results indicate that the fuzzy PID controller can improve the dynamic performance of the ship speed control system, decrease oscillation as well

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Purkayastha, Bishwajyoti, and Tanmoy Bhattacharya. "Submodule Capacitor Voltage Regulation of Modular Multilevel Converter Based Traction Propulsion System With Medium Frequency Isolation." IEEE Transactions on Industry Applications 57, no. 1 (2021): 904–14. http://dx.doi.org/10.1109/tia.2020.3036327.

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14

Kersten, Anton, Manuel Kuder, and Torbjörn Thiringer. "Hybrid Output Voltage Modulation (PWM-FSHE) for a Modular Battery System Based on a Cascaded H-Bridge Inverter for Electric Vehicles Reducing Drivetrain Losses and Current Ripple." Energies 14, no. 5 (2021): 1424. http://dx.doi.org/10.3390/en14051424.

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This paper shows a preliminary study about the output voltage modulation of a modular battery system based on a seven-level cascaded H-bridge inverter used for vehicle propulsion. Two generally known modulation techniques, pulse width modulation (PWM) and fundamental selective harmonic elimination (FSHE), are extensively compared for such an innovative modular battery system inverter considering EVs’ broad torque-speed range. The inverter and the battery losses, as well as the inverter-induced current THD, are modeled and quantified using simulations. At low speeds, if the modulation index M i

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PANASIUK, Jarosław, Waldemar ŚMIETAŃSKI, Michał SIWEK, and Piotr PRUSACZYK. "Remote Control of a Mobile Robot for Inspection and Engineering Work in Ductwork." Problems of Mechatronics Armament Aviation Safety Engineering 10, no. 4 (2019): 113–23. http://dx.doi.org/10.5604/01.3001.0013.6495.

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Inspection and engineering work inside ducts are a serious challenge in terms of logistics and processing. Processing-wise, a major obstacle is the remote control over a modular mobile unit with a variable cinematic configuration and intended to manage complex operating processes. This paper presents the results of the development of a mobile robot for inspection and engineering work. The items of a specific focus of the development work were the remote-control system structure and the control algorithms for the propulsion module control and the operating module control.

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Caresta, Mauro, and Nicole J. Kessissoglou. "Reduction of Hull-Radiated Noise Using Vibroacoustic Optimization of the Propulsion System." Journal of Ship Research 55, no. 03 (2011): 149–92. http://dx.doi.org/10.5957/jsr.2011.55.3.149.

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Vibration modes of a submarine are excited by fluctuating forces generated at the propeller and transmitted to the hull via the propeller-shafting system. The low frequency vibrational modes of the hull can result in significant sound radiation. This work investigates reduction of the far-field radiated sound pressure from a submarine using a resonance changer implemented in the propulsion system as well as design modifications to the propeller-shafting system attachment to the hull. The submarine hull is modeled as a fluid-loaded ring-stiffened cylindrical shell with truncated conical end cap

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Mohammadi Pirouz, Hassan, and Amin Hajizadeh. "A Highly Reliable Propulsion System with Onboard Uninterruptible Power Supply for Train Application: Topology and Control." Sustainability 12, no. 10 (2020): 3943. http://dx.doi.org/10.3390/su12103943.

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Providing uninterrupted electricity service aboard the urban trains is of vital importance not only for reliable signaling and accurate traffic management but also for ensuring the safety of passengers and supplying emergency equipment such as lighting and signage systems. Hence, to alleviate power shortages caused by power transmission failures while the uninterruptible power supplies installed in the railway stations are not available, this paper suggests an innovative traction drive topology which is equipped by an onboard hybrid energy storage system for railway vehicles. Besides, to limit

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LOW, K. H. "MANEUVERING OF BIOMIMETIC FISH BY INTEGRATING A BUOYANCY BODY WITH MODULAR UNDULATING FINS." International Journal of Humanoid Robotics 04, no. 04 (2007): 671–95. http://dx.doi.org/10.1142/s0219843607001217.

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Biomimetic robots borrow their senses and structure from animals, such as insects, fishes, and human. Development of underwater vehicles is one of the areas where biomimetic robots can potentially perform better than conventional robots. In this paper, an undulating fin mechanism has been developed and used as the propulsion system of fish in various fin types. The layout and workspace of the modular fin segments are considered and analyzed. The relationship of the individual fin segment and phase angles with the overall fin trajectory is also discussed. A gymnotiform knifefish robot, as an ex

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Dudek, Magdalena, Bartłomiej Lis, Andrzej Raźniak, Mariusz Krauz, and Michał Kawalec. "Selected Aspects of Designing Modular PEMFC Stacks as Power Sources for Unmanned Aerial Vehicles." Applied Sciences 11, no. 2 (2021): 675. http://dx.doi.org/10.3390/app11020675.

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Two types of air-cooled modular polymer membrane fuel cells (PEMFC) stacks with full equipment were constructed and investigated as components of hybrid power sources. The first, a 2-kW PEMFC stack, was assembled from two 1-kW PEMFC modules electrically connected in parallel and compared with a commercial PEMFC stack built from one 2-kW PEMFC module. The second, a 500-W PEMFC stack, was assembled with three modules connected in parallel. It was found that the two-module PEMFC stack was capable of operation with nominal power of 2 kW. Analysis of the distribution of the air cooling system in bo

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Mitran, Tudor, Nicolae Chioreanu, Horia Beles, Alexandru Rus, and Nicolae Polojintef-Corbu. "The Calculation of the Pressure Losses in the Hydraulic Circuit of a Single Regime Operating Thermal-Hydraulic Generator." Applied Mechanics and Materials 822 (January 2016): 305–10. http://dx.doi.org/10.4028/www.scientific.net/amm.822.305.

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<strong>The thermo-hydraulic single regime operating generator is an innovative concept developed for the propulsion of road vehicles. The aim of the paper is to calculate the pressure losses in the hydraulic circuit of the single regime running thermo-hydraulic generator. The calculus is based on a modular approach proposed by. The pressure of the hydraulic liquid is determined by taking into consideration the local and the linear pressure losses in the system. These pressure losses are calculated applying classic formulas. This is important because the free piston displacement depends

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Belіkov, V., O. Hryhoriev, S. Kovalishyn, and I. Symonenkova. "MODERN SYSTEM OF THE POWER SUPPLY OF THE MODULE TRANSPORT PLATFORMS OF GROUND ROBOTIC COMPLEXES FOR COVERT COMBAT ACTIONS." Collection of scientific works of Odesa Military Academy 2, no. 12 (2019): 33–38. http://dx.doi.org/10.37129/2313-7509.2019.12.2.33-38.

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The choice of energy sources to ensure the smooth functioning of the entire set of actuators of an autonomous transport platform of ground military robot, including traction propulsion, has a decisive impact on the overall performance and viability of the entire GRC (ground robotic complex) and determines, ultimately, its quality and reliability in the process. For covert warfare, recommending the use of energy sources such as internal combustion engines is impractical because of the high levels of inherent acoustic noise. With the advent of electrochemical energy sources, significant progress

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Arias Chao, Manuel, Chetan Kulkarni, Kai Goebel, and Olga Fink. "Aircraft Engine Run-to-Failure Dataset under Real Flight Conditions for Prognostics and Diagnostics." Data 6, no. 1 (2021): 5. http://dx.doi.org/10.3390/data6010005.

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A key enabler of intelligent maintenance systems is the ability to predict the remaining useful lifetime (RUL) of its components, i.e., prognostics. The development of data-driven prognostics models requires datasets with run-to-failure trajectories. However, large representative run-to-failure datasets are often unavailable in real applications because failures are rare in many safety-critical systems. To foster the development of prognostics methods, we develop a new realistic dataset of run-to-failure trajectories for a fleet of aircraft engines under real flight conditions. The dataset was

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Lombardi, Simone, Manfredi Villani, Daniele Chiappini, and Laura Tribioli. "Cooling System Energy Consumption Reduction through a Novel All-Electric Powertrain Traction Module and Control Optimization." Energies 14, no. 1 (2020): 33. http://dx.doi.org/10.3390/en14010033.

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In this work, the problem of reducing the energy consumption of the cooling circuit for the propulsion system of an all-electric vehicle is approached with two different concepts: improvement of the powertrain efficiency and optimization of the control strategy. Improvement of the powertrain efficiency is obtained through a modular design, which consists of replacing the electric powertrain with several smaller traction modules whose powers sum up to the total power of the original powertrain. In this paper, it is shown how modularity, among other benefits, also allows reducing the energy cons

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Liu, Chang, and Wenbai Chen. "A RUL prediction method of equipments based on MSDCNN-LSTM." Xibei Gongye Daxue Xuebao/Journal of Northwestern Polytechnical University 39, no. 2 (2021): 407–13. http://dx.doi.org/10.1051/jnwpu/20213920407.

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In order to solve the problems of high data dimension and insufficient consideration of time series correlation information, a multi-scale deep convolutional neural network and long-short-term memory (MSDCNN-LSTM) hybrid model is proposed for remaining useful life (RUL) of equipments. First, the sensor data is processed through normalization and sliding time window to obtain input samples; then multi-scale deep convolutional neural network (MSDCNN) is used to capture detailed spatial features, at the same time, time-dependent features are extracted for effective prediction combining with long

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Chu, Chia-Hua, Chia-Jung Lee, and Hsiang-Yuan Yeh. "Developing Deep Survival Model for Remaining Useful Life Estimation Based on Convolutional and Long Short-Term Memory Neural Networks." Wireless Communications and Mobile Computing 2020 (December 4, 2020): 1–12. http://dx.doi.org/10.1155/2020/8814658.

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The application of mechanical equipment in manufacturing is becoming more and more complicated with technology development and adoption. In order to keep the high reliability and stability of the production line, reducing the downtime to repair and the frequency of routine maintenance is necessary. Since machine and components’ degradations are inevitable, accurately estimating the remaining useful life of them is crucial. We propose an integrated deep learning approach with convolutional neural networks and long short-term memory networks to learn the latent features and estimate remaining us

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Zhu, Hongmin. "Real-Time Prognostics of Engineered Systems under Time Varying External Conditions Based on the COX PHM and VARX Hybrid Approach." Sensors 21, no. 5 (2021): 1712. http://dx.doi.org/10.3390/s21051712.

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In spite of the development of the Prognostics and Health Management (PHM) during past decades, the reliability prognostics of engineered systems under time-varying external conditions still remains a challenge in such a field. When considering the challenge mentioned above, a hybrid method for predicting the reliability index and the Remaining Useful Life (RUL) of engineered systems under time-varying external conditions is proposed in this paper. The proposed method is competent in reflecting the influence of time-varying external conditions on the degradation behaviour of engineered systems

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Ruiz-Tagle Palazuelos, Andrés, Enrique López Droguett, and Rodrigo Pascual. "A novel deep capsule neural network for remaining useful life estimation." Proceedings of the Institution of Mechanical Engineers, Part O: Journal of Risk and Reliability 234, no. 1 (2019): 151–67. http://dx.doi.org/10.1177/1748006x19866546.

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With the availability of cheaper multi-sensor systems, one has access to massive and multi-dimensional sensor data for fault diagnostics and prognostics. However, from a time, engineering and computational perspective, it is often cost prohibitive to manually extract useful features and to label all the data. To address these challenges, deep learning techniques have been used in the recent years. Within these, convolutional neural networks have shown remarkable performance in fault diagnostics and prognostics. However, this model present limitations from a prognostics and health management pe

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Hou, Guisheng, Shuo Xu, Nan Zhou, Lei Yang, and Quanhao Fu. "Remaining Useful Life Estimation Using Deep Convolutional Generative Adversarial Networks Based on an Autoencoder Scheme." Computational Intelligence and Neuroscience 2020 (August 1, 2020): 1–14. http://dx.doi.org/10.1155/2020/9601389.

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Accurate predictions of remaining useful life (RUL) of important components play a crucial role in system reliability, which is the basis of prognostics and health management (PHM). This paper proposed an integrated deep learning approach for RUL prediction of a turbofan engine by integrating an autoencoder (AE) with a deep convolutional generative adversarial network (DCGAN). In the pretraining stage, the reconstructed data of the AE not only participate in its error reconstruction but also take part in the DCGAN parameter training as the generated data of the DCGAN. Through double-error reco

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Chowdhury, Abhra Roy, Vinoth Kumar, Bhuneshwar Prasad, Rajesh Kumar, and S. K. Panda. "Model-Based Control of a BCF Mode Carangiform Bioinspired Robotic Fish." Marine Technology Society Journal 48, no. 4 (2014): 36–50. http://dx.doi.org/10.4031/mtsj.48.4.5.

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Abstract Bioinspired robotic locomotion in the ocean environment can unveil critical issues on maneuverability, efficiency, and power consumption. This paper describes the modeling and closed-loop control of a bioinspired robotic fish. A body-caudal fin (BCF) carangiform swimming mode is presented. The propulsion scheme simulates the oscillatory motion of fish tail as thrust generator. The manufactured prototype is a 45-cm-long BCF mode four-joint, 6 degree of freedom modular robotic fish with a horizontal caudal fin (tail). The system uses DC servomotors as actuators and is controlled by micr

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Heydari, Mohammad Mahdi, and Nooredin Ghadiri Massoom. "Experimental Study of the Swirling Oxidizer Flow in HTPB/N2O Hybrid Rocket Motor." International Journal of Aerospace Engineering 2017 (2017): 1–10. http://dx.doi.org/10.1155/2017/3174140.

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Effects of swirling oxidizer flow on the performance of a HTPB/N2O Hybrid rocket motor were studied. A hybrid propulsion laboratory has been developed, to characterize internal ballistics characteristics of swirl flow hybrid motors and to define the operating parameters, like fuel regression rate, specific impulse, and characteristics velocity and combustion efficiency. Primitive variables, like pressure, thrust, temperature, and the oxidizer mass flow rate, were logged. A modular motor with 70 mm outer diameter and variable chamber length is designed for experimental analysis. The injector mo

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D’Ovidio, Gino, Antonio Ometto, and Carlo Villante. "A Novel Optimal Power Control for a City Transit Hybrid Bus Equipped with a Partitioned Hydrogen Fuel Cell Stack." Energies 13, no. 11 (2020): 2682. http://dx.doi.org/10.3390/en13112682.

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The development of more sustainable and zero-emissions collective transport solutions could play a very important measure in the near future within smart city policies. This paper tries to give a contribution to this aim, proposing a novel approach to fuel cell vehicle design and operation. Traditional difficulties experienced in fuel cell transient operation are, in fact, normally solved in conventional vehicle prototypes, through the hybridization of the propulsion system and with the complete fulfillment of transients in road energy demand through a high-capacity onboard energy storage devi

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Xie, Zhiyuan, Shichang Du, Jun Lv, Yafei Deng, and Shiyao Jia. "A Hybrid Prognostics Deep Learning Model for Remaining Useful Life Prediction." Electronics 10, no. 1 (2020): 39. http://dx.doi.org/10.3390/electronics10010039.

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Remaining Useful Life (RUL) prediction is significant in indicating the health status of the sophisticated equipment, and it requires historical data because of its complexity. The number and complexity of such environmental parameters as vibration and temperature can cause non-linear states of data, making prediction tremendously difficult. Conventional machine learning models such as support vector machine (SVM), random forest, and back propagation neural network (BPNN), however, have limited capacity to predict accurately. In this paper, a two-phase deep-learning-model attention-convolution

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Rengasamy, Divish, Mina Jafari, Benjamin Rothwell, Xin Chen, and Grazziela P. Figueredo. "Deep Learning with Dynamically Weighted Loss Function for Sensor-Based Prognostics and Health Management." Sensors 20, no. 3 (2020): 723. http://dx.doi.org/10.3390/s20030723.

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Deep learning has been employed to prognostic and health management of automotive and aerospace with promising results. Literature in this area has revealed that most contributions regarding deep learning is largely focused on the model’s architecture. However, contributions regarding improvement of different aspects in deep learning, such as custom loss function for prognostic and health management are scarce. There is therefore an opportunity to improve upon the effectiveness of deep learning for the system’s prognostics and diagnostics without modifying the models’ architecture. To address

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Nichols, T. Richard. "Distributed force feedback in the spinal cord and the regulation of limb mechanics." Journal of Neurophysiology 119, no. 3 (2018): 1186–200. http://dx.doi.org/10.1152/jn.00216.2017.

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This review is an update on the role of force feedback from Golgi tendon organs in the regulation of limb mechanics during voluntary movement. Current ideas about the role of force feedback are based on modular circuits linking idealized systems of agonists, synergists, and antagonistic muscles. In contrast, force feedback is widely distributed across the muscles of a limb and cannot be understood based on these circuit motifs. Similarly, muscle architecture cannot be understood in terms of idealized systems, since muscles cross multiple joints and axes of rotation and further influence remote

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Li, Yaping, Enrico Zio, and Ershun Pan. "An MEWMA-based segmental multivariate hidden Markov model for degradation assessment and prediction." Proceedings of the Institution of Mechanical Engineers, Part O: Journal of Risk and Reliability 235, no. 5 (2021): 831–44. http://dx.doi.org/10.1177/1748006x21990527.

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Degradation is an unavoidable phenomenon in industrial systems. Hidden Markov models (HMMs) have been used for degradation modeling. In particular, segmental HMMs have been developed to model the explicit relationship between degradation signals and hidden states. However, existing segmental HMMs deal only with univariate cases, whereas in real systems, signals from various sensors are collected simultaneously, which makes it necessary to adapt the segmental HMMs to deal with multivariate processes. Also, to make full use of the information from the sensors, it is important to differentiate st

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Ludovico Homem, William, and Vitorino Biazi Neto. "ESTIMATIVA DO TEMPO DE VIDA ÚTIL PARA MOTORES AERONÁUTICOS COMERCIAIS: UMA ABORDAGEM RECORRENTE E CONVOLUCIONAL." Revista Ifes Ciência 6, no. 4 (2020): 21–35. http://dx.doi.org/10.36524/ric.v6i4.761.

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O desenvolvimento de modelos prognósticos possui uma grande importância no campo industrial, uma vez que a utilização da manutenção preditiva, em detrimento da corretiva ou preventiva, permite a minimização de custos de manutenção. Todavia, a criação de modelos baseados na coleta de dados históricos esbarra em dificuldades devido à baixa disponibilização de conjuntos que atendam à característica citada, o que favorece a utilização do banco de dados oriundo do Commercial Modular Aero-Propulsion System Simulation (C-MAPSS) para a proposição dessas tecnologias. O texto corrente propõe um modelo r

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Kong, Zhengmin, Yande Cui, Zhou Xia, and He Lv. "Convolution and Long Short-Term Memory Hybrid Deep Neural Networks for Remaining Useful Life Prognostics." Applied Sciences 9, no. 19 (2019): 4156. http://dx.doi.org/10.3390/app9194156.

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Reliable prediction of remaining useful life (RUL) plays an indispensable role in prognostics and health management (PHM) by reason of the increasing safety requirements of industrial equipment. Meanwhile, data-driven methods in RUL prognostics have attracted widespread interest. Deep learning as a promising data-driven method has been developed to predict RUL due to its ability to deal with abundant complex data. In this paper, a novel scheme based on a health indicator (HI) and a hybrid deep neural network (DNN) model is proposed to predict RUL by analyzing equipment degradation. Explicitly,

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Tarovik, O. V., A. G. Topaj, A. B. Krestyantsev, and A. A. Kondratenko. "Arctic Marine Transport System Simulation: Multidisciplinary Approach Fundamentals and Practical Experience." Arctic: Ecology and Economy, no. 1(25) (March 2017): 86–101. http://dx.doi.org/10.25283/2223-4594-2017-1-86-101.

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Development of new offshore projects in the Arctic begins with comprehensive analysis of Marine Transport System’s (MTS) performance. At the same time researchers with different professional orientation (shipbuilders, logisticians, economists and managers etc.) are often have narrow view while making their investigations of MTS, focusing mostly at corresponding familiar sides of the system. It leads to specific “disproportional” description of MTS’s when some components considered in detail but other are out of investigation that in some cases may result in inaccurate conclusions. This makes a

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Sanfilippo, Filippo, Erlend Helgerud, Per Stadheim, and Sondre Aronsen. "Serpens: A Highly Compliant Low-Cost ROS-Based Snake Robot with Series Elastic Actuators, Stereoscopic Vision and a Screw-Less Assembly Mechanism." Applied Sciences 9, no. 3 (2019): 396. http://dx.doi.org/10.3390/app9030396.

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Snake robot locomotion in a cluttered environment where the snake robot utilises a sensory-perceptual system to perceive the surrounding operational environment for means of propulsion is defined as perception-driven obstacle-aided locomotion (POAL). From a control point of view, achieving POAL with traditional rigidly-actuated robots is challenging because of the complex interaction between the snake robot and the immediate environment. To simplify the control complexity, compliant motion and fine torque control on each joint is essential. Accordingly, intrinsically elastic joints have become

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Stippich, Alexander. "Key Components of Modular Propulsion Systems for Next Generation Electric Vehicles." CPSS Transactions on Power Electronics and Applications 2, no. 4 (2017): 249–58. http://dx.doi.org/10.24295/cpsstpea.2017.00023.

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Mogavero, Alessandro, and Richard E. Brown. "Modular, Fast Model for Design and Optimization of Hypersonic Vehicle Propulsion Systems." Journal of Spacecraft and Rockets 55, no. 5 (2018): 1261–81. http://dx.doi.org/10.2514/1.a33676.

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葛, 仁超. "Research on Mission Reliability of Marine Propulsive System Based on Modular Simulation." Dynamical Systems and Control 07, no. 04 (2018): 328–36. http://dx.doi.org/10.12677/dsc.2018.74037.

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Ostroukhov, N. N., and E. V. Chumakova. "POTENTIALITY OF MULTI-MODULAR TRANSFORMER WATERCRAFTS FOR OCEAN EXPLORATION." World of Transport and Transportation 17, no. 5 (2020): 114–28. http://dx.doi.org/10.30932/1992-3252-2019-17-5-114-128.

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The multi-modular transformer watercrafts based on modules with vortex engines might represent a new class of watercrafts significantly expanding the range of achievable parameters in production processes carried out in the World Ocean. Composed of modules of the same type and capable of functioning autonomously with vortex propulsion devices, they can, firstly, be assembled to sizes and shapes that are not accessible to modern vessels of traditional design, and secondly, if necessary, they will not have limitations in terms of independent operation, so their properties are similar to artifici

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Pequera, Germán, Ignacio Ramírez Paulino, and Carlo M. Biancardi. "Common motor patterns of asymmetrical and symmetrical bipedal gaits." PeerJ 9 (August 16, 2021): e11970. http://dx.doi.org/10.7717/peerj.11970.

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Background Synergy modules have been used to describe activation of lower limb muscles during locomotion and hence to understand how the system controls movement. Walking and running have been shown shared synergy patterns suggesting common motor control of both symmetrical gaits. Unilateral skipping, an equivalent gait to the quadrupedal gallop in humans, has been defined as the third locomotion paradigm but the use by humans is limited due to its high metabolic cost. Synergies in skipping have been little investigated. In particular, to the best of our knowledge, the joint study of both trai

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Ronanki, Deepak, and Sheldon S. Williamson. "A Simplified Space Vector Pulse Width Modulation Implementation in Modular Multilevel Converters for Electric Ship Propulsion Systems." IEEE Transactions on Transportation Electrification 5, no. 1 (2019): 335–42. http://dx.doi.org/10.1109/tte.2018.2884610.

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Grigore, Lucian Ștefăniță, Ionica Oncioiu, Iustin Priescu, and Daniela Joița. "Development and Evaluation of the Traction Characteristics of a Crawler EOD Robot." Applied Sciences 11, no. 9 (2021): 3757. http://dx.doi.org/10.3390/app11093757.

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Today, terrestrial robots are used in a multitude of fields and for performing multiple missions. This paper introduces the novel development of a family of crawling terrestrial robots capable of changing very quickly depending on the missions they have to perform. The principle of novelty is the use of a load-bearing platform consisting of two independent propulsion systems. The operational platform, which handles the actual mission, is attached (plug and play) between the two crawler propulsion systems. The source of inspiration is the fact that there are a multitude of intervention robots i

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Clark, David J., Lena H. Ting, Felix E. Zajac, Richard R. Neptune, and Steven A. Kautz. "Merging of Healthy Motor Modules Predicts Reduced Locomotor Performance and Muscle Coordination Complexity Post-Stroke." Journal of Neurophysiology 103, no. 2 (2010): 844–57. http://dx.doi.org/10.1152/jn.00825.2009.

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Evidence suggests that the nervous system controls motor tasks using a low-dimensional modular organization of muscle activation. However, it is not clear if such an organization applies to coordination of human walking, nor how nervous system injury may alter the organization of motor modules and their biomechanical outputs. We first tested the hypothesis that muscle activation patterns during walking are produced through the variable activation of a small set of motor modules. In 20 healthy control subjects, EMG signals from eight leg muscles were measured across a range of walking speeds. F

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ROMET-LEMONNE, GUILLAUME, EMMANUELE HELFER, VINCENT DELATOUR, et al. "BIOMIMETIC SYSTEMS SHED LIGHT ON ACTIN-BASED MOTILITY DOWN TO THE MOLECULAR SCALE." Biophysical Reviews and Letters 04, no. 01n02 (2009): 5–15. http://dx.doi.org/10.1142/s1793048009000909.

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Cell motility, one of the modular activities of living cells, elicits the response of the cell to extra-cellular signals, to move directionally, feed, divide or transport materials. The combined actions of molecular motors and re-modeling of the cytoskeleton generate forces and movement. Here we describe mechanistic approaches of force and movement produced by site-directed assembly of actin filaments. The insight derived from a biochemical analysis of the protein machineries involved in "actin-based motile processes" like cell protrusions, invaginations, organelle propulsion, is used to build

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James, Mark L., Andrew A. Shapiro, Paul L. Springer, and Hans P. Zima. "Adaptive Fault Tolerance for Scalable Cluster Computing in Space." International Journal of High Performance Computing Applications 23, no. 3 (2009): 227–41. http://dx.doi.org/10.1177/1094342009106190.

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Future missions of deep-space exploration face the challenge of building more capable autonomous spacecraft and planetary rovers. Given the communication latencies and bandwidth limitations for such missions, the need for increased autonomy becomes mandatory, along with the requirement for enhanced on-board computational capabilities while in deep-space or time-critical situations. This will result in dramatic changes in the way missions are conducted and supported by on-board computing systems. Specifically, the traditional approach of relying exclusively on radiation-hardened hardware and mo

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Jia, Yongnan, and Long Wang. "Three-dimensional swimming robotic fish with slide-block structure: design and realization." Robotica 32, no. 5 (2013): 823–34. http://dx.doi.org/10.1017/s0263574713001173.

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SUMMARYThis paper focuses on the mechanism design of a slide-block structure and its application on a biomimetic modular robotic fish for three-dimensional swimming. First, as a barycenter-adjustor, the slide-block structure is integrated into a mechanical design of a robotic fish, which is constructed by a control module, a driving module, and a fan-shaped caudal fin. The three-dimensional locomotion of robotic fish is decomposed into two-dimensional locomotion in horizontal plane and ascent–descent locomotion in vertical plane. Both the kinematics of the horizontal swim and the dynamics of t

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