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检索条件"任意字段=Conference on Design and Engineering of Optical Systems II"

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Contact stress analysis of cycloidal pin wheel of RV reducer 3

Contact stress analysis of cycloidal pin wheel of RV reducer

引用

3rd International conference on Advanced Manufacturing Technology and Manufacturing systems, ICAMTMS 2024

作者： Qiao, Xuetao Zhai, Jin Zhang, Yuxiang Liu, Fengzhuo Wang, Yiming College of Mechanical and Electrical Engineering Zhongyuan University of Technology Longhu Campus 1 Huaihe Road Zhengzhou451191 China

ISBN: (纸本)9781510681804

Parametric modeling of the cycloid wheel of an RV reducer was carried out using SolidWorks. Subsequently, simulations of the contact stress and strain before and after the modification of the cycloid pin wheel were conducted based on ANSYS software. By comparing the contact stress and strain of the cycloid pin wheel before and after modification, weak points in the meshing process were identified. Structural optimization of these parts was then performed to achieve smoother operation. This research holds significant reference value for the structural design of the cycloid wheel. © 2024 SPIE.

关键词： Wheels

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design and simulation analysis of humanoid lower limb with a parallel compliant actuator 3

Design and simulation analysis of humanoid lower limb with a...

引用

3rd International conference on Advanced Manufacturing Technology and Manufacturing systems, ICAMTMS 2024

作者： Xiao, Bingyang Fang, Zaojun Jiang, Dexin Chen, Junjun Wang, Yalin Faculty of Mechanical Engineering and Mechanics Ningbo University Ningbo315201 China Ningbo Institute of Materials and Technology & Engineering CAS Ningbo315201 China

ISBN: (纸本)9781510681804

This article presents a design method for humanoid lower limbs with a parallel compliant actuator. The integration of series-parallel main actuators and parallel efficient energy storage mechanisms significantly improves energy efficiency of the humanoid lower limb. The lower limb design is semi-anthropomorphic, with similar mass and mass distribution. Then a three-degree-of-freedom kinematic model of the humanoid lower limbs is established in the Cartesian coordinate system. Besides, The Lagrange equation is utilized to establish the inverse dynamics model, resulting in the derivation of the relationship between joint torque and joint angle. Subsequently, the parameters of elastic elements in the energy storage mechanism are optimized. The energy storage performance of the humanoid lower limbs is simulated in ADAMS. The simulation results validate that the parallel compliant actuation design can improve the energy efficiency of the lower limb, compared with rigid actuation systems. © 2024 SPIE.

关键词： Inverse problems

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Optimization of commercial vehicle cab structure design based on mixed sensitivity analysis 3

Optimization of commercial vehicle cab structure design base...

引用

3rd International conference on Mechatronics and Mechanical engineering, ICMME 2024

作者： Ruan, Jingkui Li, Guansheng Liu, Weizhen Hubei University of Automotive Technology Shiyan442002 China

ISBN: (纸本)9781510681651

In order to improve the lightweight optimization effect of commercial vehicles, a certain flat-head commercial vehicle cab is used as the research object to establish a geometric model of the commercial vehicle cab. Through stiffness calculation, bending deformation of the cab longitudinal beam and calculation of the windshield door frame Deformation analysis to evaluate the stiffness performance of the cab model. A free modal analysis is carried out, with the Z-direction displacement under bending conditions and the first-order torsional natural frequency not being less than the initial value as constraints, and the minimum cab weight and torsional deformation as the optimization objectives. The 16 selected products were screened by relative sensitivity analysis. The thickness variables are optimized for design, and the NSGA-ii genetic algorithm is used for multi-objective optimization, and the solution that meets various performance requirements and has smaller quality is selected as the optimized solution. The optimization results show that while the cab weight is reduced by 13kg, the stiffness performance is significantly improved, with a weight reduction rate of 3.44%, and the optimization effect is significant. © 2024 SPIE.

关键词： Sensitivity analysis

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systems and Requirements engineering: An Approach and a Software Tool for the Interactive and Consistent Functional Requirement Specification

Systems and Requirements Engineering: An Approach and a Soft...

引用

International Joint conference on Mechanics, design engineering and Advanced Manufacturing, JCM 2022

作者： Pasquariello, Agnese Vitolo, Ferdinando Patalano, Stanislao Fraunhofer J-Lab IDEAS Department of Industrial Engineering University of Naples Federico II Naples Italy

ISBN: (纸本)9783031159275

Managing the complexity of modern systems is a current challenge involving all the phases of a system development process. Complex systems also mean a great number of stakeholders involved and just as many needs to satisfy. In the systems engineering approach for complex systems design, Requirements engineering provides methods to collect stakeholders needs and to translate them into system requirements. Furthermore, several tools currently allow creating requirements repository and manage their properties and changes. Traceability is also implemented to verify design against requirements. Although there are several standards and guidelines which provide criteria and rules for writing requirement statements, it is still missed a process that drives the user in the correct requirement construction. The present paper faces the requirement specification process in order to provide tools that can support and drive designers in the requirements writing. In particular, the paper (i) provides a framework for writing syntactically correct requirements that can be early verified against pre-defined criteria such as clarity, singularity, conformity, and descriptiveness;(ii) presents a software tool for creating well-defined requirements statements offering the user the possibility to formulate "correct requirements by construction". The driven definition of system requirements leads to a well-defined specification, thus allowing time and efforts reduction during the following steps of system development process. © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： systems engineering

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Multi-objective optimization based on vehicle lane change

Multi-objective optimization based on vehicle lane change

引用

2023 International conference on Smart Transportation and City engineering, STCE 2023

作者： Lan, Wen An Institute of Logistics Science and Engineering Shanghai Maritime University Shanghai201306 China

ISBN: (纸本)9781510673540

A multi-objective planning on vehicle lane changing is constructed, the NSGA-ii algorithm is used to find the Pareto feasible solution, and the High-D dataset is introduced for validation analysis. The results show that the driver's goal in lane changing is to pursue higher speed and efficiency, when the environment of vehicle lane changing affects the initial headway spacing, headway time distance, maximum acceleration, and maximum speed when changing lanes should 6.54 ~ 8.34m,1.08 ~ 2.32s, 2.24 ~ 4.56m/s2, 31.54 ~ 46.74/s, when the vehicle changing lane can obtain higher speed and efficiency gains with lower vehicle carbon emissions. © 2024 SPIE.

关键词： Multiobjective optimization

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design Approach and Performance Analysis of Type I, Type ii, and Type iiI PLL 7

Design Approach and Performance Analysis of Type I, Type II,...

引用

7th International conference on Computer Applications in Electrical engineering-Recent Advances, CERA 2023

作者： Oinam, Lotika Devi Singh, Alka Delhi Technological University Electrical Engineering Delhi India

ISBN: (纸本)9798350305005

This paper discusses the general design approach of the three types of Phase Lock Loop viz Type I, Type ii, and Type iiI. The design technique is based on the fact that the number of zero-pole pair at the origin determines the type and loop control dynamics of the PLL, whereas high-frequency poles in the loop filter define filtering characteristics. A single-phase Quasi-type I with Moving average filter is discussed as Type I structure. The performance control system of Type ii is explained using Synchronous Reference Frame (SRF) PLL, and Enhanced PLL (EPLL) is considered for the model of Type iiI PLL. Suitable mathematical analysis has been depicted for the three PLLs along with stability analysis using bode plots. The comparative performance analysis of the three types of PLLs is considered under certain grid conditions viz. voltage sag, swell, polluted grid, phase angle jump, step frequency change and dc offset. The performance of these PLLs is investigated using models developed in Matlab/Simulink environment. © 2023 IEEE.

关键词： Phase locked loops

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optical Imaging of Compact Photographic Zoom Lens systems 2

Optical Imaging of Compact Photographic Zoom Lens Systems

引用

2nd IEEE International conference for Women in Innovation, Technology and Entrepreneurship, ICWITE 2024

作者： Rudiran, Sureshkumar Dhanalakshmi, Samiappan Srm Institute of Science and Technology College of Engineering and Technology Department of Electronics and Communication Engineering T.N Kattankulathur India

ISBN: (纸本)9798350383287

optical imaging technologies rely on zooming to enhance visual clarity and achieve high resolution. The zooming capability of imaging systems is influenced by several elements, including the focal length of each group, the zoom ratio, the range of focal lengths, the front focal length, the back focal length, the image distance, and the object length. This paper discusses a photographic zoom lens with group of three element and a focal length range of 35 mm to 69 mm. The entrance pupil diameter (EPD) is 8.5885 mm, the visible wavelength is 656, 486, 587nm, the field of angle is 0, 14, 19, the F-number range is from 4.1633 ,5.8407 and 8.02 for three zooming level, and the semi field of view (FOV) is 28,20,15 degrees. The performance of this suggested system design is evaluated by measuring and observing the picture quality utilizing advanced techniques such as modulation transfer function (MTF), ray aberration curve, point spread function, and spot diagram (SPO). The modulation transfer function (MTF) is 0.9 for a spatial frequency of 20-line pairs per millimeter (lp/mm), and 0.8 for a spatial frequency of 50 lp/mm. The spot diagram indicates that the rays converge along the optical axis at zoom point 1, in contrast to zoom positions 2 and 3. © 2024 IEEE.

关键词： optical transfer function

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design and verification of a feedforward controller of permanent magnet synchronous motors 3

Design and verification of a feedforward controller of perma...

引用

3rd International conference on Advanced Manufacturing Technology and Manufacturing systems, ICAMTMS 2024

作者： Zhang, Xingxing Cao, Jiayong Zhu, Ziwei Liu, Chenshu School of Mechanical Engineering Shanghai Institute of Technology Shanghai China

ISBN: (纸本)9781510681804

Permanent magnet synchronous motor (PMSM) servo systems was widely used in industrial servos, automation, and other fields. With the advancement of industrial technology, high demands have been put forward for the response capability of PMSM servo systems. This paper addresses the issues of slow response speed and steady-state errors that traditional servo motor position closed-loop control systems might produce. The inadequacies of using conventional PI regulators for feedback closed-loop control in control systems requiring high-precision positioning has been analyzed. Starting with constructing a mathematical model of the PMSM, A simulation model has been built for the vector control system of the servo motor and designed speed feedforward and acceleration feedforward controllers. By setting up an experimental platform for the PMSM servo drive system, The significant effect of the designed feedforward controller on improving the fast response ability of the position and reducing the steady-state error of the position was verified. © 2024 SPIE.

关键词： Closed loop control systems

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New Robotic Telescope system progress towards Critical design Review 10

New Robotic Telescope system progress towards Critical Desig...

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conference on Ground-Based and Airborne Telescopes X

作者： Copley, David Ashley, Richard Bates, Stuart Bento, Joao Buntin, Sebastian Copperwheat, Chris Garner, Adam Garton, Beth Heffernan, David Jermak, Helen Law, David McGrath, Adrian Miossec, Chloe Ranjbar, Ali Smith, Robert Steele, Iain Goded, Alejandra Gutierrez, Carlos M. Prieto, Alberto Puga, Marta Quintana, Cesar Rebolo, Rafael de Cos, Javier Rodriguez, Javier Gracia Pereira, Cesar Rodriguez Lasheras, Fernando Sdnchez Abarzuza, Fernando Liverpool John Moores Univ Astrophys Res Inst Liverpool L3 5RF Merseyside England Inst Astrofis Canarias C Via Lactea S-N San Cristobal la Laguna 38205 Spain Univ La Laguna Dept Astrofs Tenerife 38206 Spain Univ Oviedo Inst Ciencias & Tecnol Espaciales Asturias ICTEA C Independencia 13 Oviedo 33004 Spain Light Bridges SL Avda Alcalde Ramirez Bethencourt 17 E-35004 Las Palmas Gran Canaria Canarias Spain

ISBN: (纸本)9781510675117;9781510675124

The 4m class New Robotic Telescope (NRT) is an optical facility designed to revolutionize the rapid follow-up and classification of variable and transient objects. The project is at the stage where key systems are progressing through their detailed design phases, which presents a major engineering challenge for all project partners to manage design progress of the high-level interfacing systems while still ensuring the delivery of top-level science requirements. The freezing of key system architecture features at the preliminary design review in 2021 has allowed significant progress to be made towards a target of engineering First Light (EFL) in 2027. The project critical path is currently driven by the optics and the enclosure. Both of these components are novel in design: the NRT will have an 18-segment primary mirror and a large, fully-opening clamshell enclosure. Particular progress has been made regarding enclosure design, software & control, science & operations software and the focal station and associated science support instrumentation. The Critical design Review for the M3 (fold mirror) was completed Q4 2022 which enabled manufacturing of the first NRT glassware to begin and prototyping of the complete opto-mechanical, hardware and software subsystem for its control to take place. The NRT will join the 2m Liverpool Telescope on La Palma, and as such this existing facility has been exploited to prototype the new science operations user interface and the NRT wavefront sensor.

关键词： New Robotic Telescope NRT Critical design Review systems systems engineering Requirements system Interfaces optical system

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Research on the usability of high-speed railway cab based on FBS model

Research on the usability of high-speed railway cab based on...

引用

2024 International conference on Smart Transportation and City engineering, STCE 2024

作者： Hu, Chenxiao Li, Jian Ma, Siqun Yang, Huilin Wu, Chenhui Dalian Jiaotong University School of Art Dalian China Dalian Jiaotong University School of Locomotive and Rolling Stock Engineering Dalian China

ISBN: (纸本)9781510690585

With the widespread use of high-speed trains, the design and ease of use of train cabs have become more and more important. As an important part of modern transportation, the design of the cab of a high-speed train directly affects the driver's efficiency, safety and comfort. In the face of increasingly complex train control systems and changing operating environments, a cab with good usability can help drivers perform their tasks more efficiently, re-duce their work pressure, and improve the safety and accuracy of train operations. © 2025 SPIE.

关键词： Ergonomics

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