检索结果-内蒙古大学图书馆

69th International Conference on Vibroengineering

作者： Rebot, Dariia Topilnytskyy, Volodymyr Svidrak, Inga Stotsko, Rostyslav Shevchuk, Anzhela Computer Design Systems Department Lviv Polytechnic National University Lviv Ukraine Department of Design Machine and Automotive Engineering Lviv Polytechnic National University Lviv Ukraine Department of Technical Mechanics and Engineering Graphics Lviv Polytechnic National University Lviv Ukraine

A structural diagram of a vibratory drum separator has been developed, and based on it, a mathematical model of the separator’s oscillatory motion has been constructed. The mathematical model was built using nonlinear mechanics methods and Lagrange equations. The obtained dependencies allow for determining the influence of geometric and physico-mechanical parameters on various factors affecting the intensity of the separation process. The research results should be used both at the design stages of vibratory separators and when selecting their parameters and operational modes. © 2024 Dariia Rebot, et al.

关键词： Separators

来源：评论

学校读者我要写书评

暂无评论

A Mathematical Model Creation for Vibration Propagation in a Plate Based on the Concept of a Longitudinally Moving One-Dimensional Body

A Mathematical Model Creation for Vibration Propagation in a...

引用

International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory (DIPED)

作者： Dariia Rebot Serhiy Shcherbovskykh Tetyana Stefanovych Olena Stankevych Volodymyr Topilnytskyy Computer Design Systems Department Lviv Polytechnic National University Lviv Ukraine Design Machine and Automotive Engineering Department Lviv Polytechnic National University Lviv Ukraine

ISBN: (数字)9798331506087

ISBN: (纸本)9798331506094

A mathematical model has been developed to describe the impact of the mechanical characteristics of plate materials on oscillation frequency. The construction of this model utilizes the fundamental concept of wave motion in longitudinally moving one-dimensional bodies and the Van der Pol method. The study examines the propagation of oscillations in both resonant and non-resonant cases for plates with varying elastic properties. The findings from this research can be applied to the optimization and configuration of electronic components in devices and equipment.

关键词： Vibrations Inverse problems Electromagnetic scattering Electronic components Resonant frequency Mathematical models Electromagnetics Oscillators Optimization Acoustic waves

来源：评论

学校读者我要写书评

暂无评论

Apparent vs. true battery aging: Impact of various load characteristics on accelerated aging tests

引用

Journal of Energy Storage 2025年 127卷

作者： Schreiber, Markus Lin, Yilei Sommer, Alessandro Wassiliadis, Nikolaos Torricos, Pablo Morales Rogge, Marcel Lewerenz, Meinert Grosu, Cristina Endisch, Christian Jossen, Andreas Lienkamp, Markus School of Engineering & Design Department of Mobility Systems Engineering Institute of Automotive Technology Garching85748 Germany School of Engineering & Design Department of Mechanical Engineering Institute for Machine Tools and Industrial Management Garching85748 Germany Research Group Electromobility and Learning Systems Ingolstadt85019 Germany School of Engineering & Design Department of Energy and Process Engineering Institute of Electrical Energy Storage Munich80333 Germany

Vehicle applications involve highly dynamic and variable operating conditions. These result from changing driving profiles and diverse driving behaviors. To accelerate battery aging tests, experiments are often based on constant load cycles. While efficient, this approach distorts the natural degradation behavior of the cells. This study compares cell aging under real-world and laboratory load conditions. For this purpose, we compare realistic driving profiles measured in a test vehicle in the field with synthetic constant power cycles. Average discharge power and charging sequences are kept identical for comparability. Results show that constant power cycles cause stronger cell aging than dynamic loads. Differential voltage analysis indicates more lithium inventory loss and active material loss at the negative electrode under static loads. Static loading also leads to strong inhomogeneity in the negative electrode and altered charge transfer and diffusion kinetics, as shown by impedance data. After 15 months of rest, the cells recovered up to 52 % of lost capacity and 66 % of the resistance increase. Impedance assessment and differential voltage analysis confirm the recovery and rehomogenization of the negative electrode. These findings show that conventional accelerated tests are strongly influenced by relaxation and load dynamics. As a result, their applicability to specific use cases, such as automotive applications, is strongly limited. Therefore, andraditional test strategies require reconsideration and redesign. © 2025 The Authors

关键词： Negative resistance

来源：评论

学校读者我要写书评

暂无评论

Camera-LiDAR Inconsistency Analysis for Active Learning in Object Detection

Camera-LiDAR Inconsistency Analysis for Active Learning in O...

引用

IEEE Symposium on Intelligent Vehicle

作者： Esteban Rivera Ana Clara Serra Do Nascimento Markus Lienkamp Technical University of Munich Germany Department of Mobility Systems Engineering School of Engineering and Design Institute of Automotive Technology Munich Institute of Robotics and Machine Intelligence (MIRMI)

ISBN: (数字)9798350348811

ISBN: (纸本)9798350348828

Today, deep learning detectors for autonomous driving are delivering impressive results on public datasets and in real-world applications. However, these detectors require large amounts of data, especially labeled data, to achieve the performance needed to ensure safe driving. The process of collecting and tagging data is expensive and cumbersome. Therefore, the recent focus of the industry has been on how to achieve similar performance while limiting the amount of labeled data required to train such models. Within the cross-modal active learning paradigm, we propose and analyze new strategies to exploit the inconsistencies between camera and LiDAR detectors to improve sampling efficiency and label only the samples that promise improvements for model training. For this, we leverage the 2D projection of the bounding boxes to equalize the output quality of camera and LiDAR detections. Finally, we achieve up to 0.6% AP improvement for camera and 2% improvement for LiDAR over random sampling on the KITTI dataset using a sampling strategy based on the number of detected objects.

关键词： Training Industries Laser radar Three-dimensional displays Limiting Detectors Object detection

来源：评论

学校读者我要写书评

暂无评论

A Novel Information-Theoretic Metric for Evaluating LiDAR Setups of Autonomous Vehicles

A Novel Information-Theoretic Metric for Evaluating LiDAR Se...

引用

IEEE International Conference on Systems, Man and Cybernetics

作者： Philipp Hafemann Xulin Song David Brecht Technical University of Munich Germany Department of Mobility Systems Engineering School of Engineering & Design Institute of Automotive Technology and Munich Institute of Robotics and Machine Intelligence (MIRMI)

ISBN: (数字)9781665410205

ISBN: (纸本)9781665410212

The sensor configuration of an autonomous vehicle (AV) is determined in the early development phase when specific perception algorithms are not yet available. Therefore, approaches based on synthetic raw data are necessary to evaluate different configurations. One sensor type used in AV is LiDAR, but developers should carefully consider the amount and placement of the sensors due to their high costs. In this contribution, we propose the Omni-Lidar Evaluation Score (OLES), a novel metric to evaluate different LiDAR configurations based on their simulated raw data. Our OLES metric combines information-theoretic quantities with coverage-based metrics, considering both the spatial coverage and the uniformity of a LiDAR point cloud distribution. We show the need for a new metric and provide details on implementing OLES using the open-source simulator CARLA. We demonstrate the effectiveness of our new metric in a simulation study and highlight its usefulness in the early phases of vehicle development. This research provides a means to evaluate the quality of LiDAR configurations and provides a basis for further optimizing sensor setups for AVs.

关键词： Measurement Point cloud compression Laser radar Costs Autonomous vehicles Cybernetics Information theory

来源：评论

学校读者我要写书评

暂无评论

Justification of the Parameters for an Autonomous Lubrication System to Supply Turbocharger Rotor Bearings in Negative Temperatures Conditions

Justification of the Parameters for an Autonomous Lubricatio...

引用

2022 International Conference on engineering Management of Communication and Technology, EMCTECH 2022

作者： Gritsenko, Aleksander Grakov, Fedor Shepelev, Vladimir Nevolin, Dmitry Kaliyev, Beibit South Ural State Agrarian University Department of Machine-Tractor Fleet Operation Troitsk Russia South Ural State University Department of Automobile Transport Chelyabinsk Russia Ural State University of Railway Transport Department of Design and Operation of Vehicles Ekaterinburg Russia Nlc A. Baitursynov Kostanay Regional University Department of Mechanical Engineering Kostanay Kazakhstan

ISBN: (数字)9798350397680

ISBN: (纸本)9798350397680

The paper studies and systematises factors resulting in turbocharger (TC) failure. They are divided into structural, technical, technological, operational factors. The factors are listed clearly and result in the deterioration of the reliability of the internal combustion engine (ICE) and turbocompressor (TCR). Turbocharger elements may eventually and irreversibly lose their functionality and fail. This may lead to the failure of the ICE and the automobile as a whole. The theoretical part of the article considers the following issues: theoretical justification of the oil pressure at the inlet to the TCR bearing;theoretical justification of the oil temperature at the inlet and outlet of the TCR bearing;theoretical justification of the oil flow through the TCR rotor bearing;and theoretical justification of monitoring modes. The research program and methodology involve the study of the following issues: output parameters of the TCR under various ICE operating modes;the choice of measuring equipment for research;the laboratory research method;the method of processing and systematization of experimental data. The main result of this part of the research is the development of an experimental work bench. The implementation of all preparatory work and the preparation of the bench equipment was followed by the experimental part. At this stage the following issues were resolved: experimental studies were carried out with variable values of TCR bearing inlet pressure;experimental studies were carried out to monitor oil temperature at the TCR bearing outlet;experimental studies were carried out to monitor a set of factors. © 2022 IEEE.

关键词： Deterioration

来源：评论

学校读者我要写书评

暂无评论

Optimizing Autonomous Vehicle Sensor Setups: A Framework for Coverage Analysis

Optimizing Autonomous Vehicle Sensor Setups: A Framework for...

引用

International Conference on Multisensor Fusion and Integration for Intelligent Systems (MFI)

作者： Philipp Hafemann Simon Enrico Hahn Markus Lienkamp Department of Mobility Systems Engineering Institute of Automotive Technology and Munich Institute of Robotics and Machine Intelligence (MIRMI) Technical University of Munich Germany School of Engineering & Design Munich Germany

The performance of environment perception in autonomous vehicles is significantly influenced by the sensor setup, which is determined in the early design phase. The selection of the type and position of sensors in this phase often occurs before the availability of data processing algorithms. Therefore, the evaluation of the sensor setup can only be based on coverage metrics. This paper presents a novel framework for modeling the sensor coverage of autonomous vehicles. By discretizing the environment into grid cells, our framework analyzes each sensor and the whole setup. Our methodology systematically determines the coverage, identifies redundancy and blind spot areas, and obtains quantifiable metrics for evaluating the sensor setup efficiency. Utilizing the PyVista visualization library, we present the individual building blocks of the framework and their open-source implementation. The results from a real-world case study demonstrate our framework’s ability to identify weaknesses in sensor setup coverage. Our approach helps to develop a comprehensive understanding of the sensor coverage and, therefore, contributes to designing more effective and reliable sensing systems.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Influence Analysis of Production Defects of Lithium-Ion Cells Using Single-Cell and Multi-Cell Characterization

SSRN

引用

SSRN 2022年

作者： Ank, Manuel Stock, Sandro Wassiliadis, Nikolaos Burger, Thaddäus Daub, Rüdiger Lienkamp, Markus School of Engineering & Design Department of Mobility Systems Engineering Institute of Automotive Technology Germany School of Engineering & Design Department of Mechanical Engineering Institute for Machine Tools and Industrial Management Germany

To meet the challenge of significant expansion of vehicle electrification around the world, it is crucial for cell manufacturers to supply high quality lithium-ion cells for battery electric vehicle performance requirements at low scrap rates for both capital and competitive reasons. Hence, there is considerable interest in being able to inspect produced cells quickly and in high volumes, both by means of formation tests and in subsequent end-of-line tests. This article demonstrates and evaluates the detection of potential production defects during the formation and cell characterization process steps, presenting a novel method for simultaneous characterization of multiple lithium-ion cells in the context of cell production (multi-cell characterization method). 46 coin cells are assembled, with six different fault types induced, ranging from particle contamination to electrolyte and moisture deviations to varying formation temperatures. The results of the extensive single-cell characterization show that a differential voltage analysis performed at low currents allows a robust detection of all induced fault types, whereas conventional capacitance screening, direct current internal resistance techniques and electrochemical impedance spectroscopy measurements do not permit sufficiently accurate detection. In addition, the cell defects can also be detected using the presented multi-cell characterization with an economized number of required test channels. © 2022, The Authors. All rights reserved.

关键词： Defects

来源：评论

学校读者我要写书评

暂无评论

The possibility of noticing the cyclists based on reflective effect of the elements on the bicycle pedals

引用

Periodica Polytechnica transportation engineering 2021年第2期49卷 132-138页

作者： Tarkowski, Slawomir Nieoczym, Aleksander Caban, Jacek Madleňák, Radovan Department of Motor Vehicles Faculty of Mechanical Engineering Lublin University of Technology Nadbystrzycka 36 Lublin20-618 Poland Department of Machine Design and Mechatronics Faculty of Mechanical Engineering Lublin University of Technology Nadbystrzycka 36 Lublin20-618 Poland Department of Agricultural Forestry and Transport Machines Faculty of Production Engineering University of Life Sciences in Lublin Glęboka 28 Lublin20-612 Poland Department of Communications Faculty of Operation and Economics of Transport and Communications University of Zilina Univerzitná 8215/1 Žilina010 26 Slovakia

The article presents the results of the research describing the changes of bicycle pedal angle relative to the ground, depending on the bicycle crank setting, and the impact of these parameters on detecting the reflective effect emitted by the reflective elements mounted on the bicycle pedals. The results of the road tests determining the cyclist detecting by a car driver, when bicycle is equipped only with bicycle pedals, reflective lights, illuminated with car′s passing lights are also presented. The research described in this article has been carried out for the purpose of reviewing the causes of traffic accidents, occurring at night, in the areas not illuminated by the street lights, in which the cyclists using defective bicycles (according to the regulations) took part. © 2020 Budapest University of Technology and Economics. All rights reserved.

关键词： Accidents

来源：评论

学校读者我要写书评

暂无评论

Comparison of various types of damage symptoms in the task of diagnostic composite profiles

引用

Diagnostyka 2019年第3期20卷 105-110页

作者： Markuszewski, Damian Department of Fundamentals of Machine Design and Operation Institute of Machine Design Fundamentals Faculty of Automotive and Construction Engineering Warsaw University of Technology Poland

The current trend of weight reduction entails a reduction in safety factors. This approach is understandable, but light profiles are more susceptible. The structure works close to the boundary loads, and their destruction is primarily determined by dynamic relief. Today, composite masts are diagnosed by the following methods: optical microscopy, electron microscopy, X-ray analysis and thermal analysis. These methods are invasive methods. It seems that the vibration analysis of the mast - rigging system could supplement or replace the mentioned methods without the need to dismantle the mast, giving the possibility of testing on the yacht [5]. The article presents the possibility of diagnosing a composite material defect on the example of a interrupts a continuity of structure. © 2019 Polish Society of Technical Diagnostics. All rights reserved.

关键词： Safety factor

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：