To reasonably set the triggering time of each stage coil of the energy recovery type reluctance launcher and improve efficiency, this paper proposes a method based on Bayesian Random Forest Model (BO-RF) and Northern ...
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ISBN:
(数字)9789038661353
ISBN:
(纸本)9798350352733
To reasonably set the triggering time of each stage coil of the energy recovery type reluctance launcher and improve efficiency, this paper proposes a method based on Bayesian Random Forest Model (BO-RF) and Northern Goshawk Optimization algorithm (NGO) to predict and optimize the on-off timing of IGBT switches in each stage coil. the method was validated by building a simulation model of a 5-stage energy recovery reluctance launcher. the results showed that after optimization, the armature muzzle velocity increased from 71.2m/s to 89.89m/s, and the launcher efficiency increased from 26.78% to 32.86%.
this review paper provides an exhaustive analysis of the current state of generative models used for speech enhancement, with a focus on Autoencoders, Diffusion models, and Generative Adver- sarial Networks (GANs). Pa...
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ISBN:
(数字)9798331520038
ISBN:
(纸本)9798331520045
this review paper provides an exhaustive analysis of the current state of generative models used for speech enhancement, with a focus on Autoencoders, Diffusion models, and Generative Adver- sarial Networks (GANs). Particular emphasis is placed on understanding their principles, architecture, and applicability to speech enhancement. Furthermore, we delve into the advantages and limitations of these models, highlighting methodological progression, and recent trends. the study also emphasizes the significance of Public Perception of Current Speech Enhancement methods and discusses potential future directions and challenges in the field - exploring strategies for improving generalization, robustness, and the incorporation of multi-modal information. the conclusion summarizes the key findings of the collected literature, suggesting potential applications and impacts of the discussed generative models for speech enhancement.
this paper presents an approach to intuitive robot control by gestures made by a human operator supported by augmented reality. Unlike to the concepts of different robot manufactures to guide the robot using the manua...
this paper presents an approach to intuitive robot control by gestures made by a human operator supported by augmented reality. Unlike to the concepts of different robot manufactures to guide the robot using the manual control pendant, gesture control would be a universal method to drive the manipulator arm, where no special knowledge is necessary. For this purpose, we develop a set of gestures to move the robot in Cartesian space and to operate the gripper. In order to that, it is possible to program handling tasks, which are very relevant concerning robotic tasks. Furthermore, our scenario may be enhanced towards teleoperation. Augmented reality is then used for verification and modification of the robot program. In contrast to several approaches which use expensive hardware, for example head mounted displays, our concept needs only a monitor or a video projector. We compare the performance of gesture based robot control with conventional methods, such as moving the manipulator withthe teach pendant or by hand guidance. For this purpose, a simple handling task is configured and the programming times are analyzed.
the article explains an interoperable method for the exchange construction information, particularly concerning civil infrastructure projects. Open BIM standards offer a neutral platform for information exchange, enha...
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ISBN:
(数字)9798350362343
ISBN:
(纸本)9798350362350
the article explains an interoperable method for the exchange construction information, particularly concerning civil infrastructure projects. Open BIM standards offer a neutral platform for information exchange, enhancing data integration throughout all construction and operation phases. the Information Delivery Specification Standard (IDS), a component of open BIM standards, along withthe Information Delivery Manual (IDM), facilitates the timely and organized exchange of information. the research was aimed to determine if generating requirements for open BIM models could be automated in accordance with IDS standards. It was also assumed that the input data are the requirements from the BIM Execution Plan (BEP). the research results show the ability to generate IDS files automatically, which improves model verification and enables quick adjustments. Despite the challenges, the use of IDS as an element of open BIM standards enhances the construction processes.
this article is developed and improved a mathematical model that describes the influence of errors in determining the structure of the approximating function on the results of automatic control object identification. ...
this article is developed and improved a mathematical model that describes the influence of errors in determining the structure of the approximating function on the results of automatic control object identification. A dynamic string with a load fixed at both ends is considered, an approximation is made and its modeling is carried out. methods for determining the parameters of the selected approximating structure from the system’s response to a known input signal have been analyzed. An unconventional method for determining the transfer function using the method of least squares has been proposed. the universality of the mathematical description expands the possibilities of taking into account many factors that affect its properties and also establishes the validity degree of assumptions and simplifications in the process of analyzing the dynamics as a whole.
Safe human-robot-collaboration requires the robot not to pose a risk to the operator in the shared workspace. To avoid collisions different approaches such as sekleton-model based motion predictions of the human opera...
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A successful grid synchronization is essential for grid-following converters. Usually, a phase-locked loop (PLL) is applied to synchronize the converter to the grid, but this process can fail in weak grid scenarios, r...
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ISBN:
(数字)9798350362343
ISBN:
(纸本)9798350362350
A successful grid synchronization is essential for grid-following converters. Usually, a phase-locked loop (PLL) is applied to synchronize the converter to the grid, but this process can fail in weak grid scenarios, resulting in an unstable converter controller. Studies have been carried out to investigate this issue, but there are no applicable conditions that guarantee the stability in the transient case. the PLL-based grid synchronization of a grid-side converter with output filter of LC-type and grid impedance of RL-type is investigated in this work. A transient stability condition is known for this system, but its evaluation requires the time domain solution of the underlying differential equations. In this paper, a criterion is derived, that shows the fulfilment of the condition without the need for the time domain solution. Since the criterion is based on conservative estimates, it provides only a sufficient proof of stability. the criterion is implemented and validated in numerical simulations.
this work presents a new approach in the comparative analysis of three excitation signals applied in a system identification process. the excitation signals employed are Pseudo-Random Binary Sequence (PRBS), Sine Swee...
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ISBN:
(数字)9798350362343
ISBN:
(纸本)9798350362350
this work presents a new approach in the comparative analysis of three excitation signals applied in a system identification process. the excitation signals employed are Pseudo-Random Binary Sequence (PRBS), Sine Sweep (CHIRP), and Gaussian White Noise (GWN). Moreover, with comparative purposes, two algorithms are used to identify a Multiple-Input-Multiple-Output (MIMO) system of 100 degrees of freedom: a State-space identification method based on the traditional Eigensystem Realization Algorithm (ERA) and the linear-regression method ARMAX. the MIMO system is submitted to five levels of additive measurement noise: 1%, 1.5%, 2%, 2.5%, and 3%. the results are statistically analysed composed by 100 simulations for each set of algorithm parameters. the simulations show that, apart from the GWN, well-known as an appropriated excitation signal for application in systems withthe characteristics portrayed in the present work, the PRBS can be another feasible signal to identify the MIMO system simulated accordingly withthe identification method chosen.
Multi-robot coverage path planning (mCPP) involves devising efficient motion sequences for robots to cover all positions within a workspace, excluding obstacles. this paper focuses on addressing the path-planning chal...
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ISBN:
(数字)9798350362343
ISBN:
(纸本)9798350362350
Multi-robot coverage path planning (mCPP) involves devising efficient motion sequences for robots to cover all positions within a workspace, excluding obstacles. this paper focuses on addressing the path-planning challenge of a Divide Area based on Robot’s Initial Positions (DARP), where a group of mobile robots is tasked with covering a predefined area containing obstacles. this work proposes an improved DARP algorithm for efficient coverage. the proposed algorithm, combined withthe $A^{*}$ and the spanning tree coverage algorithm, assigns tasks to robots to optimally achieve full coverage of the desired area. It transforms the initial mCPP problem into individual coverage path planning tasks of single-robot, combining their solutions to form the optimal solution for mCPP. this method significantly improves performance by reducing coverage time, minimizing the number of turns taken by robots, and enhancing overall coverage efficiency.
Collecting large amounts of real-world interaction data to train general robotic policies is often prohibitively expensive, thus motivating the use of simulation data. However, existing methods for data generation hav...
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