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检索条件"丛书名=Mechanisms and Machine Science"

共 3195 条记录，以下是451-460 订阅

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Setting up a Model to Study the Truck Mixer Dynamics II 9th

Setting up a Model to Study the Truck Mixer Dynamics II

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9th European Conference on Mechanism science (EuCoMeS)

作者： Afshari, Farshad Garcia-Pozuelo, Daniel Univ Carlos III Madrid Mech Engn Dept Adv Vehicle Dynam & Mechatron Syst VEDYMEC Avda Univ 30 Leganes 28911 Spain

ISBN: (纸本)9783031672972;9783031672958;9783031672941

Trucks, given their elevated center of mass, are particularly susceptible to rollovers, thus amplifying the potential for significant damage owing to their considerable weight. This issue becomes even more critical when additional forces influence the vehicle. The study of the effect of a moving mass is particularly interesting to analyze roll over issues in truck mixers. This study aims to reveal why these trucks are more prone to rollovers through an examination of vehicle dynamics. Additionally, the forces and moments of a rotating tank with concrete are used as initial conditions for the TruckSim (R) model in a steady-state steering test, both with and without concrete load. The objective is to determine the maximum speed of the truck before any tire loses contact with the road surface when turning, identifying the rollover critical point. The findings from this study and methodology could yield significant results for designing a warning system. This system couldmeasure various parameters such as load, speed, steering angle, etc., and use them to alert the driver to prevent accidents.

关键词： Truck mixer Rollover Cargo movement Vehicle safety

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Electrospun Nanofiber Yarn Continuous Production - Analysis of Technological Possibilities to Enhance Its Evenness 14th

Electrospun Nanofiber Yarn Continuous Production - Analysis ...

引用

14th International Conference on the Theory of machines and mechanisms (TMM)

作者： Friedrich, Ondrej Valtera, Jan Beran, Jaroslav Zabka, Petr Komarek, Jiri Tech Univ Liberec Fac Mech Engn Dept Text Machine Design Studentska 2 Liberec 46001 Czech Republic

ISBN: (纸本)9783031702532;9783031702518;9783031702501

The paper presents a highly productive technology of continuous production of nanofiber yarn developed at the Technical University of Liberec. It focuses on the analysis of key technological parts with a significant effect on the length uniformity of the yarn, such as the false twisting, the ballooning of the yarn and the force applied to the twist triangle and the transfer of the twisting moment in the twisting eyelet. The discussion outlines the direction for further development to increase the uniformity and strength of the nanofiber yarn produced and thus enable its usage in various applications.

关键词： Nanofibrous Yarn Electrospinning False twisting Ballooning

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Kinematic Analysis of the Seven-Bar Linkage 7-PR(RRRR)RP Used for Medical Disinfection Robot 33rd

Kinematic Analysis of the Seven-Bar Linkage 7-PR(RRRR)RP Use...

引用

33rd International Conference on Robotics in Alpe-Adria-Danube Region (RAAD)

作者： Tulcan, Elida-Gabriela Sticlaru, Carmen Oarcea, Alexandru Sandu, Melania Olivia Lovasz, Erwin-Christian Politehn Univ Timisoara Timisoara 300006 Romania

ISBN: (纸本)9783031592591;9783031592577;9783031592560

The paper presents the type synthesis and analysis of a seven-bar linkage. The type synthesis equations lead to the computation of the symmetrical seven-bar linkage with both prismatic and revolute joints. The analysis of the mechanism shows the high variation of both its stroke and its height from the minimum to the maximum configuration. Since current disinfection robots cannot operate in multiple configurations and only disinfect large areas, the purpose of the paper is to demonstrate how folding mechanisms structures are more useful for the design of medical disinfection robots. Considering their structure allows multiple configurations, they can be used to disinfect different types of areas from the medical environment.

关键词： Seven-bar linkages Folding mechanisms Kinematic analysis Medical robots Disinfection robots

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Real-Time Flexible Multibody Simulation of a Vehicle Wheel Suspension with Elastokinematic Properties Based on Inertia Relief Modes 9th

Real-Time Flexible Multibody Simulation of a Vehicle Wheel S...

引用

9th European Conference on Mechanism science (EuCoMeS)

作者： Archut, Jan-Lukas Corves, Burkhard Rhein Westfal TH Aachen Inst Mech Theory Machine Dynam & Robot Eilfschornsteinstr 18 D-52062 Aachen Germany

ISBN: (纸本)9783031672972;9783031672958;9783031672941

The vehicle wheel suspension is a complex mechanism that guides the wheels and transmits wheel forces. In addition to its kinematic design, wheel position changes also occur due to its compliance. This elastokinematics is caused by elastic bushings but also by the flexibility of the suspension bodies. As they affect the vehicle's driving behavior, multibody simulation models should accurately represent these properties. In addition, real-time capability is desired due to the increasing importance of driving simulators in the vehicle development process. This paper demonstrates the real-time flexible multibody simulation of a vehicle wheel suspension with elastic bushings and body flexibility. Flexible bodies are modeled with the floating frame of reference approach incorporating inertia relief modes. The numerically stiff equation of motion is integrated with a linear-implicit integration scheme. Through a sensitivity analysis, a reduced mode set of in total 26 important modes was identified. With that, it is possible to simulate the suspension in real-time covering most of the influence of the body flexibility.

关键词： Wheel suspension Elastokinematics Inertia relief modes

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A Superellipse-Based Model for Tire Contact Patches Reproduction 5th

A Superellipse-Based Model for Tire Contact Patches Reproduc...

引用

5th International Tribology Symposium of IFToMM (ITS-IFToMM)

作者： Ruffini, Marco Barbaro, Mario Romagnuolo, Fabio Stefanelli, Raffaele Dell'Annunziata, Guido Napolitano Univ Naples Federico II Naples Italy

ISBN: (纸本)9783031626180;9783031626166;9783031626159

The tires are the sole point of contact between the vehicle and the road, and, they are a critical component when it comes to the vehicle's performance and handling. All the interactions that ensure the adherence of the vehicle and the handling of it take place in the tire/road contact patch. This paper discusses the importance of tire contact patches and introduces a model for representing them that utilizes an image processing procedure in combination with the superellipse equation to describe their shape even in cases of strong asymmetry. This work requires an experimental approach that utilizes a specific test rig to acquire data related to tire footprints. Image processing is used to extract useful information and determine the contour of the contact patch from the raw acquisitions. Finally, a superellipse-based contact patch model is developed to represent the shape of the footprint accurately. The tire contact patch shaped as a superellipse can be fundamental as an input for improving tire physical models and for obtaining more information regarding the tire's design.

关键词： Image processing Superellipse equation Tire Tire contact patch Vehicle dynamics

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Impact of the Load in the Orbits Described by the Sun Gear in a Planetary Gear Set with an Odd Number of Planets 9th

Impact of the Load in the Orbits Described by the Sun Gear i...

引用

9th European Conference on Mechanism science (EuCoMeS)

作者： Sanchez-Espiga, Javier Diez-Ibarbia, Alberto de Juan, Ana Garcia, Pablo Fernandez-del-Rincon, Alfonso Viadero, Fernando Univ Cantabria Dept Ingn Estruct & Mecan Santander 39005 Spain

ISBN: (纸本)9783031672972;9783031672958;9783031672941

This work focuses on the study of the orbits described by the sun gear of a planetary transmission measured from the planet carrier. Furthermore, this study focuses on the impact that the load and the number of planets have in the orbit described by the mentioned gear under different mesh phasing conditions. The combination of a given number of teeth and the number of planets sets the shape that the orbit describes. However, not only it affects the shape of the orbit, but also it changes the size and the variability of the sun gear position, which has relevant impact in the dynamic behaviour of a planetary transmission. On the other hand, the raise in the number of planets adds stiffness to the system due to the augmentation in the simultaneous contacts, therefore, it has an impact in the overall size of the orbit.

关键词： Mesh phasing Planetary gear set Number of planets Sun gear orbit

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Preliminary Model of the Energy Consumption of an Independent Cart Conveyor System 5th

Preliminary Model of the Energy Consumption of an Independen...

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5th International Conference of International-Federation-for-the-Promotion-of-Mechanism-and-machine-science Italy (IFToMM Italy)

作者： Boscariol, Paolo Richiedei, Dario Tamellin, Iacopo Trevisani, Alberto Univ Padua Dipartimento Tecn & Gest Sistemi Ind Vicenza Italy

ISBN: (纸本)9783031645716;9783031645693;9783031645686

Understanding by means of properly formulated models the energy consumption of an industrial device is the first step towards the reduction of the impact of energy usage by industry. The aim of this work is the development of a simple procedure that can lead to the determination of a rather accurate model of the energy consumption of an independent cart conveyor system with Permanent Magnet Synchronous Linear Motor such as the B&R ACOPOStrak. The modeling is built by a linear regression of measurement data that represent the electric energy intake from the power distribution system, thus taking into account the energy consumption of the whole device.

关键词： energy independent cart conveyor modeling power consumption efficiency ACOPOStrak

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Comparison of Model-Based Techniques for Vehicle Sideslip Angle Estimation 5th

Comparison of Model-Based Techniques for Vehicle Sideslip An...

引用

5th International Conference of International-Federation-for-the-Promotion-of-Mechanism-and-machine-science Italy (IFToMM Italy)

作者： Ponticelli, Lorenzo Barbaro, Mario Mandragora, Geraldino Stefanelli, Andrea Torres, Goncalo Sousa Univ Naples Federico II Via Claudio 21 Naples Italy

ISBN: (纸本)9783031645716;9783031645693;9783031645686

In the automotive industry, on-board vehicle estimation of the side-slip angle plays a fundamental role in applications related to autonomous driving and within the design of active safety systems for controlling vehicle lateral dynamics. To ensure the availability of the real-time monitoring of this quantity, which can only be measured through sophisticated and expensive systems, various virtual sensing techniques have been developed in the literature. In this scenario, it is essential to find a balance between estimation robustness and computational burden to ensure the algorithm to be employable in embedded devices for on-board applications. The current paper proposes analytical and graphical analysis aimed at examining the estimation accuracy of various physical model-based methodologies, differing in terms of numerical complexity and computational cost, but employing equal tire and vehicle modelling formulation. The numerical results have been compared with accurate side-slip angle measurements, acquired during on-track test sessions, which also included the low-end sensors' signals employed into the proposed estimators.

关键词： Vehicle state estimation Vehicle dynamics Extended Kalman Filter Unscented Kalman Filter Sideslip angle Virtual sensing

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An Experimental Characterisation of Developed Knee Joint Mechanism Prototypes 6th

An Experimental Characterisation of Developed Knee Joint Mec...

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6th Symposium on Mechanism Design for Robotics (MEDER)

作者： Olinski, Michal Wroclaw Univ Sci & Technol WUST Dept Fundamentals Machine Design & Mechatron Syst Lukasiewicza St 7-9 PL-50371 Wroclaw Poland

ISBN: (纸本)9783031673856;9783031673832;9783031673825

The paper is focused on characterisation and experimental testing of two developed and built preliminary prototypes of human knee joint mechanisms. Mechanical systems of research prototypes, in the form of kinematic schemes and 3D CAD drawings, are designed with the aim to reproduce the knee joint's complex movement in the assumed range and limitations. Especially the flexion/extension in sagittal plane taking into account the joint's instantaneous centre of rotation trajectory. The first prototype is based on linearly adjustable crossed 4-bar mechanism and can modify its dimensions in real time to mimic various required motions. The second prototype uses cooperating interchangeable elements, with cam profiles, that can be adapted for individual needs. Both devices are built using 3D printed elements and characterised using results obtained from initial experiments. In order to carry out the tests an experimental layout is planned and arranged in a laboratory. Testing in couple modes was performed, but in this paper particular emphasis is placed on trials executed with human volunteers. The mechanisms' movements are measured by IMU sensors, but mainly are elaborated by analysing video recordings and tracking colour markers. Postprocessing is performed with Matlab resulting in obtaining the outcomes, as plots and numerical values. These are presented as movement trajectories of selected tibia points and calculated knee joint's flexion/extension angle to characterise the prototypes' capabilities.

关键词： Experimental mechanics Polycentric hinge Video analysis IMU

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Generation of Alternative Motion with Adjustable Stroke by Deformation of an Elastic Ring 5th

Generation of Alternative Motion with Adjustable Stroke by D...

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5th International Conference of International-Federation-for-the-Promotion-of-Mechanism-and-machine-science IFToMM ITALY (IFIT)

作者： Schioppetto, Christian Bussola, Roberto Monfrini, Matteo Faglia, Rodolfo Remino, Carlo Univ Brescia Dept Mech & Ind Engn Brescia Italy

ISBN: (纸本)9783031645556;9783031645532;9783031645525

This study presents the generation of a motion profile with adjustable stroke obtained by deforming an elastic ring of constant thickness. With this device, a good approximation to the motion profile of an elliptical cam can be achieved. Using finite element analysis, it is also shown that it is possible to generate different motion profiles close to those normally used in automatic machines when the thickness of the ring is not constant. The possibility of simple stroke control, as well as the low number of mechanical components required to build such a device, could make it a good and cost-effective alternative compared to other types of actuators.

关键词： motion profile elastic ring adjustable stroke

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