Mechanism and Machine Theory最新文献_第8页

Development and evaluation of numerical models of an aircraft seat assembly and occupant for the simulation of dynamic certification tests 用于动态认证试验模拟的飞机座椅组件和乘员数值模型的开发和评估

IF 4.5 1区工程技术

Mechanism and Machine Theory Pub Date : 2025-02-18 DOI: 10.1016/j.mechmachtheory.2025.105940

Ana P. Martins , Marta S. Carvalho , Gerardo Olivares , Hamid Lankarani

引用次数: 0

Identification of Tool and Machine Settings for Hypoid Gear Based on Non-Uniform Discretization 基于非均匀离散化的准双曲面齿轮刀机整定辨识

IF 4.5 1区工程技术

Mechanism and Machine Theory Pub Date : 2025-02-12 DOI: 10.1016/j.mechmachtheory.2025.105951

Xinqi Wei , Shuo Wang , Yawen Wang , Weiqing Zhang , Teik C Lim

{"title":"Identification of Tool and Machine Settings for Hypoid Gear Based on Non-Uniform Discretization","authors":"Xinqi Wei , Shuo Wang , Yawen Wang , Weiqing Zhang , Teik C Lim","doi":"10.1016/j.mechmachtheory.2025.105951","DOIUrl":"10.1016/j.mechmachtheory.2025.105951","url":null,"abstract":"<div><div>Identifying the tool and machine settings of tooth surfaces in hypoid gears is challenging, considering the highly model nonlinearities and the ill-conditioned Jacobian matrix. To tackle these problems, we propose a novel identification model based on non-uniform discretization for hypoid gear, with the goal of efficiently obtaining accurate design parameters. The model employs a non-uniform discretization scheme for the tooth surface, approximating the quadrature of the surface variation using the Gaussian rule. This scheme is based on the Chebyshev node, which better captures gradient variation of surface variation and provides more accurate quadrature results than a uniform grid of the same size. The fundamental analysis of the problem characteristics is performed through the condition number of the Jacobian matrix, and numerical stability is guaranteed using the non-uniform discretization and fixing non-influential variables. Finally, a numerical example is presented, and the simulations in variations scenarios are conducted to validate the proposed model. The results demonstrate that the model guarantees both identification accuracy and efficiency, with outcomes aligning with the expectations based on condition number analysis.</div></div>","PeriodicalId":49845,"journal":{"name":"Mechanism and Machine Theory","volume":"207 ","pages":"Article 105951"},"PeriodicalIF":4.5,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143386547","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An analytical model for the drum-rope interaction in hoisting mechanisms and cable-driven systems 提升机构和缆索驱动系统中鼓索相互作用的分析模型

IF 4.5 1区工程技术

Mechanism and Machine Theory Pub Date : 2025-02-12 DOI: 10.1016/j.mechmachtheory.2025.105939

Javier González-Carbajal

{"title":"An analytical model for the drum-rope interaction in hoisting mechanisms and cable-driven systems","authors":"Javier González-Carbajal","doi":"10.1016/j.mechmachtheory.2025.105939","DOIUrl":"10.1016/j.mechmachtheory.2025.105939","url":null,"abstract":"<div><div>This study introduces a new analytical model for the drum-rope interaction in mechanical systems actuated through ropes or cables. The model consists of a set of analytical force–displacement relations that capture the extensibility of the rope and the drum-rope contact interaction, assuming linear elastic behavior and Coulomb friction. It is derived from a detailed analysis of the tension distribution along the rope when subjected to a dynamic pulling force, distinguishing between stick and slip regions. The response of the rope is found to be linear under gross slip conditions, becoming significantly nonlinear under partial slip. In practical terms, the proposed drum-rope model can be applied to the dynamic simulation of hoisting mechanisms and cable driven systems. This is achieved by introducing a nonlinear spring, defined by specific force–displacement relations, to represent each cable wound on a reeling drum within the overall model. The presented approach is numerically validated using a finite element model, with remarkable agreement between both solutions. It is also compared with a conventional modeling approach that assumes no slippage between drum and rope, demonstrating 39% higher accuracy in a representative scenario.</div></div>","PeriodicalId":49845,"journal":{"name":"Mechanism and Machine Theory","volume":"207 ","pages":"Article 105939"},"PeriodicalIF":4.5,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143394268","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A bilateral wrist robotic system with compliant actuation for rehabilitation training 一种用于康复训练的柔性驱动双侧手腕机器人系统

IF 4.5 1区工程技术

Mechanism and Machine Theory Pub Date : 2025-02-10 DOI: 10.1016/j.mechmachtheory.2025.105937

Zhimin Hou, Yao Tong, Ke Shi, Haoyong Yu

引用次数: 0

Evaluation of robot kinematic performance under motion constraints in a teleoperated robotic ultrasound system 遥操作机器人超声系统运动约束下的机器人运动学性能评价

IF 4.5 1区工程技术

Mechanism and Machine Theory Pub Date : 2025-02-10 DOI: 10.1016/j.mechmachtheory.2025.105952

Kai Wu , Shaoxiong Feng , Hengyi An , Giuseppe Carbone , Weihua Li

{"title":"Evaluation of robot kinematic performance under motion constraints in a teleoperated robotic ultrasound system","authors":"Kai Wu , Shaoxiong Feng , Hengyi An , Giuseppe Carbone , Weihua Li","doi":"10.1016/j.mechmachtheory.2025.105952","DOIUrl":"10.1016/j.mechmachtheory.2025.105952","url":null,"abstract":"<div><div>In a teleoperated robotic ultrasound system based on serial robots, a doctor uses a master device to control a slave serial robot for performing ultrasound inspections on patients. To effectively detect organs deep beneath the skin, the robot's motion direction and velocity must be precisely controlled, where the translational or rotational motion is constrained to move separately. During the inspection, the target position and motion velocity need to be continuously synchronized between the master device and the serial robot to ensure optimal coordination. However, the kinematic performance of serial robots is inconsistent across the spatial workspace, leading to issues such as protective stops, velocity fluctuations, and tracking delay errors. This paper proposes an evaluation method for the kinematic performance of serial robots based on the maximum attainable velocity in any direction. An algorithm is described to determine the corresponding maximum achievable translational or rotational velocities when rotational or translational motion is constrained. Experimental results confirm the high accuracy of this algorithm. Consequently, further workspace analysis is conducted to inform the layout and velocity settings of the teleoperated robotic ultrasound system for practical applications.</div></div>","PeriodicalId":49845,"journal":{"name":"Mechanism and Machine Theory","volume":"207 ","pages":"Article 105952"},"PeriodicalIF":4.5,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143376527","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Design and testing of a precision coupling for origami-based arrays 基于折纸阵列的精密耦合设计与测试

IF 4.5 1区工程技术

Mechanism and Machine Theory Pub Date : 2025-01-31 DOI: 10.1016/j.mechmachtheory.2025.105936

Clark Roubicek, Philip B. Klocke, Davis Wing, Spencer P. Magleby, Larry L. Howell

{"title":"Design and testing of a precision coupling for origami-based arrays","authors":"Clark Roubicek, Philip B. Klocke, Davis Wing, Spencer P. Magleby, Larry L. Howell","doi":"10.1016/j.mechmachtheory.2025.105936","DOIUrl":"10.1016/j.mechmachtheory.2025.105936","url":null,"abstract":"<div><div>Creating ways to achieve precision positioning in large-motion deployable origami-based systems through improving accuracy and repeatability in the deployed state could enable better performance and new applications, such as optics. Precision positioning of origami-based arrays can be a challenge because of the high number of interconnected panels, large motion between stowed and deployed states, and challenge identifying volumes for precision alignment systems given the thin aspect ratio of the panels. This work introduces and tests a design for a precision coupling suitable for origami-based deployable arrays. The coupling is placed in a Z-fold mechanism and in two degree-four vertex (D4V) mechanisms, which are fundamental components of many origami-based arrays. The alignment and repeatability of these mechanisms are tested using a 3D scanner and the best-fit plane. The Z-fold mechanism has a repeatability of about 0.50° and 0.50 mm, and the D4V mechanisms have a repeatability of about 0.15° and 0.50 mm. These values show potential for certain optical applications and demonstrate that precision couplings can be implemented in origami patterns to increase performance of origami-based arrays.</div></div>","PeriodicalId":49845,"journal":{"name":"Mechanism and Machine Theory","volume":"206 ","pages":"Article 105936"},"PeriodicalIF":4.5,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143156154","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Design and modeling of a multi-backbone continuum robot with a large extension ratio 大延伸比多骨干连续机器人的设计与建模

IF 4.5 1区工程技术

Mechanism and Machine Theory Pub Date : 2025-01-31 DOI: 10.1016/j.mechmachtheory.2025.105935

Xinge Li , Yukun Wang , Ke Wu , Yi Xu , Xunuo Cao , Tao Feng , Tong Chen , Piaopiao Jin , Zhe Wang , Yaoting Xue , Tuck-Whye Wong , Fanghao Zhou , Tiefeng Li

{"title":"Design and modeling of a multi-backbone continuum robot with a large extension ratio","authors":"Xinge Li , Yukun Wang , Ke Wu , Yi Xu , Xunuo Cao , Tao Feng , Tong Chen , Piaopiao Jin , Zhe Wang , Yaoting Xue , Tuck-Whye Wong , Fanghao Zhou , Tiefeng Li","doi":"10.1016/j.mechmachtheory.2025.105935","DOIUrl":"10.1016/j.mechmachtheory.2025.105935","url":null,"abstract":"<div><div>Multi-backbone continuum robots (MBCRs), operated through parallel elastic rods, offer superior compliance compared to rigid robots and improved reliability over tendon-driven continuum robots. Despite their high performance in flexible manipulation, MBCRs have been underutilized on mobile robotic platforms due to packaging constraints. In this work, we present a novel MBCR design with a large extension ratio, comprising two extensible sections connected in series. Each section is equipped with intermediate constraints, providing significant length variability and omnidirectional bending capabilities. To analyze the robot’s kinematics, we develop a modeling approach based on Euler–Bernoulli beam theory and Lagrangian mechanics, enhanced with an optimization-based solution method. To validate our design and model, we construct an MBCR prototype with an extension ratio of 5.0. Both theoretical and experimental validations demonstrate that intermediate constraints significantly expand the workspace of the extensible sections and reduce the compressive force on the rods. Additionally, we evaluate the feasible space of the model and test the robot’s capability in path following, with an average deviation of only 1.3% when tracking a spatial helix path.</div></div>","PeriodicalId":49845,"journal":{"name":"Mechanism and Machine Theory","volume":"206 ","pages":"Article 105935"},"PeriodicalIF":4.5,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143156487","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Closed-form forward kinematics of a novel class of 3-RRR spherical parallel mechanisms with coplanar intermediate-joint axes and coplanar distal-joint axes 一类具有共面中关节轴和共面远关节轴的新型3-RRR球面并联机构的闭式正运动学

IF 4.5 1区工程技术

Mechanism and Machine Theory Pub Date : 2025-01-27 DOI: 10.1016/j.mechmachtheory.2025.105930

Wei Li, Shuai Zhang, Shenghao Dai, Huaijin Ye, Weizhong Guo, Feng Gao

{"title":"Closed-form forward kinematics of a novel class of 3-RRR spherical parallel mechanisms with coplanar intermediate-joint axes and coplanar distal-joint axes","authors":"Wei Li, Shuai Zhang, Shenghao Dai, Huaijin Ye, Weizhong Guo, Feng Gao","doi":"10.1016/j.mechmachtheory.2025.105930","DOIUrl":"10.1016/j.mechmachtheory.2025.105930","url":null,"abstract":"<div><div>The forward kinematics (FK) of 3-<u>R</u>RR spherical parallel mechanisms (SPMs) has been studied extensively, which is essential for their calibration and control. These studies indicate that most 3-<u>R</u>RR SPMs are associated with octic characteristic equations, which must be solved using iterative approaches. This paper introduces a new class of 3-<u>R</u>RR SPMs featuring simplified FK formulations, characterized by three coplanar intermediate-joint axes and three coplanar distal-joint axes. Unlike most 3-<u>R</u>RR SPMs, this class admits only up to four distinct assembly modes. Moreover, four distinct formulations are proposed, all yielding quartic characteristic equations, thereby enabling closed-form FK solutions. Furthermore, one special subclass of the robot class is found to admit quadratic characteristic equations with simpler coefficient expressions. Beyond simplified FK relations, this robot class also offers unlimited rotation capability about certain directions, making it potentially attractive for practical applications. It is worth noting that this robot class provides flexibility in selecting architecture parameters, thereby allowing for a wide range of designs. Additionally, the proposed formulations can also be applied to certain parallel mechanisms with alternative topologies.</div></div>","PeriodicalId":49845,"journal":{"name":"Mechanism and Machine Theory","volume":"206 ","pages":"Article 105930"},"PeriodicalIF":4.5,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143156153","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Lapping tooth surface micro-topography prediction for extended epicycloid hypoid gears 扩展摆线准双曲面齿轮研磨齿面微形貌预测

IF 4.5 1区工程技术

Mechanism and Machine Theory Pub Date : 2025-01-27 DOI: 10.1016/j.mechmachtheory.2025.105931

Jun Wen , Wenlong Du , Jinbo Hou , Shifeng Rong , Zhenyu Zhou , Qiang Wang , Han Ding

{"title":"Lapping tooth surface micro-topography prediction for extended epicycloid hypoid gears","authors":"Jun Wen , Wenlong Du , Jinbo Hou , Shifeng Rong , Zhenyu Zhou , Qiang Wang , Han Ding","doi":"10.1016/j.mechmachtheory.2025.105931","DOIUrl":"10.1016/j.mechmachtheory.2025.105931","url":null,"abstract":"<div><div>Lapping is a complex precision tooth surface cutting technology for the extended epicycloid hypoid gears, which relies on experienced engineers to obtain ideal machining quality by setting the process parameters reasonably and accurately controlling cutting process. In order to improve the predictability and controllability, influence of different gear parameters on lapping process and geometric topography was systematically studied. Focusing on tooth surface lapping and its micro-topography, an innovative prediction method id proposed. Firstly, the hypoid gear pair model is established, and then height parameters of the tooth surface are calculated by the deduced lapping depth formula. Then, a local tooth surface was reconstructed based on the height parameters by using fast Fourier transform, and prediction model of micro-topography considering the initial topography and random wear mechanism was established. Finally, different lapping parameters considering cutting characteristics of abrasive particles is designed for their influence on tooth surface micro-topography.</div></div>","PeriodicalId":49845,"journal":{"name":"Mechanism and Machine Theory","volume":"206 ","pages":"Article 105931"},"PeriodicalIF":4.5,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143100803","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A new iterative method for calculating the time-varying meshing stiffness of orthogonal face gear pairs 一种计算正交面齿轮副时变啮合刚度的新迭代方法

IF 4.5 1区工程技术

Mechanism and Machine Theory Pub Date : 2025-01-27 DOI: 10.1016/j.mechmachtheory.2025.105938

Shuai Mo , Wenhao Song , Yingxin Zhang , Yuansheng Zhou , Bowei Yao , Haruo Houjoh , Wei Zhang

{"title":"A new iterative method for calculating the time-varying meshing stiffness of orthogonal face gear pairs","authors":"Shuai Mo , Wenhao Song , Yingxin Zhang , Yuansheng Zhou , Bowei Yao , Haruo Houjoh , Wei Zhang","doi":"10.1016/j.mechmachtheory.2025.105938","DOIUrl":"10.1016/j.mechmachtheory.2025.105938","url":null,"abstract":"<div><div>Time-varying meshing stiffness (TVMS) plays a critical part in the dynamic analysis of gear systems. This paper introduces a new iterative method for calculating the TVMS of orthogonal face gear pairs. Initially, the tooth surface equations are derived based on the shaping process. A contact coordinate system for the gear pair is subsequently established. The initial values for the equations are determined through a traversal search method, which facilitates the calculation of contact ellipse parameters and the load distribution function across the tooth surface. Subsequently, the surfaces are further analyzed by slicing along the radial direction and tooth profile. Using the potential energy method, the deflection of an equivalent cantilever beam under working conditions is derived. Load distribution coefficients are iteratively assigned and refined, with the TVMS recalculated until convergence criteria are satisfied. Finally, a case study examines the effects of pressure angle and external loads on the calculated results. The proposed model is validated through finite element analysis, demonstrating its accuracy and reliability.</div></div>","PeriodicalId":49845,"journal":{"name":"Mechanism and Machine Theory","volume":"206 ","pages":"Article 105938"},"PeriodicalIF":4.5,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143156155","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0