Vessel Scheduling Optimization Model Based on Variable Speed in a Seaport with One-Way Navigation Channel [PDF]
Sensors, 2021 To improve the efficiency of in-wharf vessels and out-wharf vessels in seaports, taking into account the characteristics of vessel speeds that are not fixed, a vessel scheduling method with whole voyage constraints is proposed.
Dongdong Liu +2 more
doaj +2 more sources
A Three-Phase Current Tacholess Envelope Order Analysis Method for Feature Extraction of Planetary Gearbox under Variable Speed Conditions [PDF]
Sensors, 2021 Planetary gearboxes are the key components of large equipment, such as wind turbines, shield machines, etc. The operating state of the planetary gearbox is related to the safety of the equipment as a whole, and its feature extraction technology is ...
Xun Zhang +5 more
doaj +2 more sources
Variable-speed tail rotors for helicopters with variable-speed main rotors [PDF]
The Aeronautical Journal, 2017 ABSTRACTVariable tail rotor speed is investigated as a method for reducing tail rotor power, and improving helicopter performance. A helicopter model able to predict the main rotor and tail rotor powers is presented, and the flight test data of the UH-60A helicopter is used for validation. The predictions of the main and tail rotor powers are generally
Han, D., Barakos, G.N.
openaire +3 more sources
Variable Speed Across Dimensions of Ability in the Joint Model for Responses and Response Times [PDF]
Frontiers in Psychology, 2021 Working speed as a latent variable reflects a respondent’s efficiency to apply a specific skill, or a piece of knowledge to solve a problem. In this study, the common assumption of many response time models is relaxed in which respondents work with a ...
Peida Zhan +4 more
doaj +2 more sources
A Novel Method for Bearing Fault Diagnosis under Variable Speed Based on Envelope Spectrum Fault Characteristic Frequency Band Identification [PDF]
Sensors, 2023 Rolling element bearing (REB) vibration signals under variable speed (VS) have non-stationary characteristics. Order tracking (OT) and time-frequency analysis (TFA) are two widely used methods for REB fault diagnosis under VS.
Di Pei, Jianhai Yue, Jing Jiao
doaj +2 more sources
Bearing Fault Diagnosis under Variable Speed Using Convolutional Neural Networks and the Stochastic Diagonal Levenberg-Marquardt Algorithm [PDF]
Sensors, 2017 This paper presents a novel method for diagnosing incipient bearing defects under variable operating speeds using convolutional neural networks (CNNs) trained via the stochastic diagonal Levenberg-Marquardt (S-DLM) algorithm.
Viet Tra +3 more
doaj +2 more sources
Internal Flow Phenomena of Two-Way Contra-Rotating Axial Flow Pump-Turbine in Pump Mode under Variable Speed [PDF]
Journal of Applied Fluid Mechanics, 2022 This paper investigated the variable speed operation of a two-way contra-rotating axial flow pump–turbine in pump mode. When counter-rotating impellers operate at the same speed, a significant difference exists in the shaft power of the two impellers ...
C. An +5 more
doaj +1 more source
ROBUST DIRECT FIELD ORIENTED CONTROL OF INDUCTION GENERATOR
Технічна електродинаміка, 2021 A novel and robust field oriented vector control method for standalone induction generators (IG) is presented. The proposed controller exploits the concept of direct field orientation and provides asymptotic rotor flux modulus and DC-link voltage ...
С.М. Пересада +3 more
doaj +1 more source
Vibration Signal Parameter Estimation in Variable Speed: Algorithms and performance bounds
ENP Engineering Science Journal, 2021 Vibration signal parameter estimation for rotating machinery diagnostics operating under variable speed conditions is considered. At first, we provide a brief survey of existing methods for Quadratic Phase Signal (QPS) parameter estimation.
Ali Abbadi +3 more
doaj +1 more source
Jurnal Teknik Industri, 2021 Due to industrialization and population growth, increasing energy demand can lead to energy scarcity because non-renewable resources are primarily used as energy sources.
Bobby Kurniawan +7 more
doaj +1 more source