Mechanical Sciences最新文献_第5页

A piezoelectric energy harvester for human body motion subjected to two different transversal reciprocating excitations 一种用于人体在两种不同的横向往复激励下运动的压电能量采集器

IF 1.4 4区工程技术

Mechanical Sciences Pub Date : 2023-02-23 DOI: 10.5194/ms-14-77-2023

W.M. Ding, J. Xie

{"title":"A piezoelectric energy harvester for human body motion subjected to two different transversal reciprocating excitations","authors":"W.M. Ding, J. Xie","doi":"10.5194/ms-14-77-2023","DOIUrl":"https://doi.org/10.5194/ms-14-77-2023","url":null,"abstract":"Abstract. Harvesting energy from human body motion to supply\u0000electricity for wearable devices is focused on in this paper. Based on the\u0000fact that the frequency of human body motion is lower and the motions of\u0000different human body parts are variable, a piezoelectric energy harvester\u0000subjected to two different transversal reciprocating excitations is studied\u0000in this paper. Each excitation is treated as a transverse rheonomic\u0000constraint. The dynamics equation of the beam is established using the\u0000Hamiltonian principle. Expressing the transverse rheonomic constraint as a\u0000periodic function, closed-form solutions of the dynamics equation are\u0000obtained. And the characteristics of energy harvesters are investigated\u0000based on the closed-form solutions. The results show that the difference\u0000between the two excitations will certainly cause the energy harvester to\u0000generate more output power at lower frequencies of excitations, and the\u0000larger the difference, the more the output power will be generated. This\u0000unusual characteristic at the lower frequency enables the proposed harvester\u0000to be quite suitable to harvest energy from the motions of the human body.\u0000","PeriodicalId":18413,"journal":{"name":"Mechanical Sciences","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49029561","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Decoupling active disturbance rejection trajectory-tracking control strategy for X-by-wire chassis system 线传底盘系统的解耦自抗扰轨迹跟踪控制策略

IF 1.4 4区工程技术

Mechanical Sciences Pub Date : 2023-02-23 DOI: 10.5194/ms-14-61-2023

Haixiao Wu, Yong Zhang, Fengkui Zhao, Pengchang Jiang

{"title":"Decoupling active disturbance rejection trajectory-tracking control strategy for X-by-wire chassis system","authors":"Haixiao Wu, Yong Zhang, Fengkui Zhao, Pengchang Jiang","doi":"10.5194/ms-14-61-2023","DOIUrl":"https://doi.org/10.5194/ms-14-61-2023","url":null,"abstract":"Abstract. Due to the inherent dynamic coupling between mechanical components such as the steering system and suspension system, the vertical external input will affect the lateral movement of the chassis, which makes it difficult to track the ideal trajectory when complex excitation conditions exist. To solve the abovementioned problems, the X-by-wire chassis is taken as the research object in this work, and the coupling dynamic model is established. Then, based on proving the reversibility of the coupling dynamic model, a pseudo-linear composite system is proposed to decouple the lateral and vertical signals of the chassis system. Next, the decoupling active disturbance rejection (DADR) trajectory-tracking control strategy is proposed. And a multi-objective optimization method of the bandwidth parameters of the DADR trajectory-tracking controller is proposed according to its convergence conditions. Experiments show that the proposed control strategy can effectively suppress the vehicle roll and yaw motion caused by the lateral–vertical dynamic coupling in the process of trajectory tracking to realize the accurate tracking of the ideal trajectory.\u0000","PeriodicalId":18413,"journal":{"name":"Mechanical Sciences","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47033852","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 feasibility and dynamic performance analysis of hydromechanical hybrid power transmission technology for wind turbines 风力机液-机混合动力传动技术的可行性及动态性能分析

IF 1.4 4区工程技术

Mechanical Sciences Pub Date : 2023-02-03 DOI: 10.5194/ms-14-33-2023

Dharmendra Kumar, Anil C. Mahato

{"title":"A feasibility and dynamic performance analysis of hydromechanical hybrid power transmission technology for wind turbines","authors":"Dharmendra Kumar, Anil C. Mahato","doi":"10.5194/ms-14-33-2023","DOIUrl":"https://doi.org/10.5194/ms-14-33-2023","url":null,"abstract":"Abstract. A multi-body dynamical model of a wind turbine power generation system (WTPGS) based on hydromechanical hybrid power\u0000transmission (HMHPT) technology is developed and simulated to overcome the\u0000individual drawbacks of the gear train and hydrostatic power\u0000transmission (HPT) system. The HMHPT is a hybrid concept of a single-stage\u0000planetary gear train (SSPGT) and a typical HPT. The input shaft of the SSPGT is coupled with the turbine rotor, whereas the output shaft of the SSPGT is coupled with the shaft of a hydraulic pump. The hydraulic pump supplies flow\u0000to the hydro-motor, and its shaft is coupled with the generator. An existing\u0000turbine blade model of 750 kW based wind turbine is used for further\u0000development and analysis of the HMHPT. The simulation responses indicate\u0000that the power generation and the control potential both have been\u0000improved using the HMHPT in a wind turbine. Moreover, the influence on\u0000the motor power generation due to variations of pump and motor leakages is\u0000addressed. Additionally, it is found that if the order of the SSPGT and the\u0000HPT are swapped in the proposed HMHPT, then the settling time, maximum\u0000overshoot, and rise time of the system responses are increased. As a result,\u0000the controllability of the system is decreased.\u0000","PeriodicalId":18413,"journal":{"name":"Mechanical Sciences","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48439754","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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: 2

Modeling and control strategy of a haptic interactive robot based on a cable-driven parallel mechanism 基于索驱动并联机构的触觉交互机器人建模与控制策略

IF 1.4 4区工程技术

Mechanical Sciences Pub Date : 2023-01-30 DOI: 10.5194/ms-14-19-2023

Da Song, Xuesu Xiao, Gang Li, Lixun Zhang, Feng Xue, Lailu Li

{"title":"Modeling and control strategy of a haptic interactive robot based on a cable-driven parallel mechanism","authors":"Da Song, Xuesu Xiao, Gang Li, Lixun Zhang, Feng Xue, Lailu Li","doi":"10.5194/ms-14-19-2023","DOIUrl":"https://doi.org/10.5194/ms-14-19-2023","url":null,"abstract":"Abstract. This study proposes a haptic interactive robot (HIR)\u0000configuration and a control strategy based on a cable-driven parallel\u0000mechanism. The ball screw drives the cable to improve the motion control\u0000accuracy. The robot system control strategy improves the accuracy and\u0000stability of haptic interaction. Through configuration optimization design\u0000and analysis, eight cables are used to ensure that the robot end effector\u0000exerts force and enables motion. Moreover, a forward and inverse kinematics\u0000model of the robot is developed. According to the configuration of the HIR,\u0000an improved cable tension distribution algorithm can facilely determine the\u0000cable tension. Hence, each cable is consistently in a tight state, and the\u0000change in tension is not sudden. Drive unit and robot system control\u0000strategies are proposed to render the haptic interaction accurate and\u0000stable. A simulation experiment of a complex space motion track is\u0000implemented through the robot end effector, thus verifying the accuracy of\u0000the established forward and inverse kinematics model. The accuracy of the\u0000tension distribution algorithm, control strategy, and robot stability are\u0000verified through simulation experiments, considering different forces and\u0000motion tracks of robot end effectors.\u0000","PeriodicalId":18413,"journal":{"name":"Mechanical Sciences","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47133675","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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: 3

Short communication: Part contour error prediction based on LSTM neural network 短通信:基于LSTM神经网络的零件轮廓误差预测

IF 1.4 4区工程技术

Mechanical Sciences Pub Date : 2023-01-16 DOI: 10.5194/ms-14-15-2023

YunSheng Zhang, Guangshun Liang, Cong Cao, Y. Li

引用次数: 0

Research on obstacle performance and tipping stability of a novel wheel–leg deformation mechanism 一种新型轮腿变形机构的障碍性能和倾翻稳定性研究

IF 1.4 4区工程技术

Mechanical Sciences Pub Date : 2023-01-05 DOI: 10.5194/ms-14-1-2023

Minghui Zhang, Yimin Su

{"title":"Research on obstacle performance and tipping stability of a novel wheel–leg deformation mechanism","authors":"Minghui Zhang, Yimin Su","doi":"10.5194/ms-14-1-2023","DOIUrl":"https://doi.org/10.5194/ms-14-1-2023","url":null,"abstract":"Abstract. A new type of wheel–leg deformation mechanism, based on an\u0000electromagnetic clutch and gear rack transmission mechanism, is designed.\u0000This mechanism has a compact structure and simple operation, which can roll on wheels and surmount obstacles with a support leg. Firstly, the walking model is established to study the kinematics characteristics of the mechanism. The\u0000alternation of the support legs does not affect smooth obstacle crossing,\u0000but will cause the step change of the angular velocity of the centroid of\u0000the main body. Secondly, the obstacle-surmounting performance of roll-over\u0000mode and obstacle-crossing mode using support legs is analyzed. For roll-over mode, the maximum climbing height is 87.36 mm. For obstacle-crossing\u0000mode using support legs, the maximum climbing height is the maximum\u0000extension length of the support leg. According to the climbing height, the\u0000switching criteria of different climbing modes are obtained. In addition,\u0000the rolling angle of the main body has a greater impact on the support force and driving torque, while the contact angle between the legs and the ground has a small impact. Finally, the tipping stability and anti-interference ability of the wheel–leg deformation mechanism is evaluated using the stability cone method.\u0000","PeriodicalId":18413,"journal":{"name":"Mechanical Sciences","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42844092","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 novel mathematical model for the design of the resonance mechanism of an intentional mistuning bladed disk system 提出了一种设计故意失谐叶盘系统共振机构的数学模型

IF 1.4 4区工程技术

Mechanical Sciences Pub Date : 2022-12-20 DOI: 10.5194/ms-13-1031-2022

X. Kan, Tuo Xing

{"title":"A novel mathematical model for the design of the resonance mechanism of an intentional mistuning bladed disk system","authors":"X. Kan, Tuo Xing","doi":"10.5194/ms-13-1031-2022","DOIUrl":"https://doi.org/10.5194/ms-13-1031-2022","url":null,"abstract":"Abstract. Bladed disk systems with advanced functions are widely used in\u0000turbo-machineries. However, there are always deviations in physical dynamic\u0000properties between blades and blades due to the tolerance and wear in\u0000operation. The deviations will lead to vibration localization, which will result in high cycle fatigue and accelerate the damage of the bladed disk\u0000system. Therefore, many intentional mistuning patterns are proposed to\u0000overcome this larger local vibration. Previous studies show that intentional\u0000mistuning patterns can be used to reduce the vibration localization of\u0000the bladed disk. However, the determination of the resonance mechanism of the intentional mistuning bladed disk system is still an unsolved issue. In this\u0000paper, a novel mathematical model of resonance of an intentional mistuning bladed disk system is established. Mistuning of blades and energy resonance\u0000are included in this theoretical model. The method of the mechanical power of the rotating blade for one cycle is applied to obtain the resonance\u0000condition. By using this theoretical model, the resonance mechanism of an intentional mistuning bladed disk is demonstrated. The results suggest that\u0000the ideal results can be obtained by adjusting the intentional mistuning\u0000parameter. This paper will guide the design of the dynamic characteristics of the intentional mistuning bladed disk.\u0000","PeriodicalId":18413,"journal":{"name":"Mechanical Sciences","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2022-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41636691","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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: 1

Dynamic modeling and vibration characteristics analysis of parallel antenna 并联天线的动力学建模与振动特性分析

IF 1.4 4区工程技术

Mechanical Sciences Pub Date : 2022-12-19 DOI: 10.5194/ms-13-1019-2022

Guoxing Zhang, Jianliang He, Jinwei Guo, Xinlu Xia

{"title":"Dynamic modeling and vibration characteristics analysis of parallel antenna","authors":"Guoxing Zhang, Jianliang He, Jinwei Guo, Xinlu Xia","doi":"10.5194/ms-13-1019-2022","DOIUrl":"https://doi.org/10.5194/ms-13-1019-2022","url":null,"abstract":"Abstract. Research on the vibration characteristics of the mechanical systems is a necessary step for the stable and reliable operation of high-end equipment. The 6 degrees of freedom parallel mechanism is proposed for the supporting mechanism of the antenna. First, the dynamic equations of the moving platform and branch of the mechanism are established. The closed-form dynamics of the mechanism are derived based on the Newton–Euler method. In addition, the vibration equation of the parallel antenna is established based on the vibration theory, and the relationship between the natural frequency, displacement response, and vibration frequency is obtained. Afterward, the pitch and roll poses of a 1.8 m aperture antenna are developed based on a MATLAB software simulation. The actuation forces of parallel antenna under no-load and load conditions are simulated. Finally, the natural frequencies and vibration modes of the initial position and roll (20∘) are simulated based on the Adams software vibration analysis module. Furthermore, the relationship between the displacement response of the moving platform and the resonant frequency is studied based on the harmonic response analysis. The control strategy based on the dynamic model improves the control accuracy of parallel antenna. This research work provides a guarantee for the dynamic characteristics analysis and engineering application of parallel antenna.\u0000","PeriodicalId":18413,"journal":{"name":"Mechanical Sciences","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2022-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42496355","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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: 2

Tooth profile design of a novel helical gear mechanism with improved geometry for a parallel shaft transmission 一种改进了平行轴传动几何形状的新型斜齿轮机构的齿形设计

IF 1.4 4区工程技术

Mechanical Sciences Pub Date : 2022-12-16 DOI: 10.5194/ms-13-1011-2022

Enyi He, Shihao Yin

引用次数: 1

Instability load analysis of a telescopic boom for an all-terrain crane 全地形起重机伸缩臂的失稳载荷分析

IF 1.4 4区工程技术

Mechanical Sciences Pub Date : 2022-11-28 DOI: 10.5194/ms-13-991-2022

Jinshuai Xu, Yingpeng Zhuo, Zhaohui Qi, G. Wang, T. Zhao, Tianyu Wang

{"title":"Instability load analysis of a telescopic boom for an all-terrain crane","authors":"Jinshuai Xu, Yingpeng Zhuo, Zhaohui Qi, G. Wang, T. Zhao, Tianyu Wang","doi":"10.5194/ms-13-991-2022","DOIUrl":"https://doi.org/10.5194/ms-13-991-2022","url":null,"abstract":"Abstract. The instability load for the telescopic boom of an all-terrain crane\u0000is investigated in this paper. Combined with structural characteristics of\u0000the telescopic boom, each boom section is divided into several substructures, and the fixed-body coordinate system of each substructure is\u0000established based on the co-rotational method. A 3D Euler–Bernoulli\u0000eccentric beam element of the telescopic boom is derived. On the premise of\u0000considering the discretization of gravity and wind load, internal degrees of freedom of the substructure are condensed to the boundary nodes, forming a geometrical nonlinear super element. According to the nesting mode of the\u0000telescopic boom, a constraint way is established. The unstressed original\u0000length of the guy rope is calculated with a given preload so as to establish the equilibrium equations of the boom system with the external force of the guy rope and the corresponding tangent stiffness matrix. Regarding the above work, a new method for calculating the structural equilibrium path and instability load of telescopic boom structure is presented by solving the governing equations in a differential form. Finally, the method is validated by examples with different features.\u0000","PeriodicalId":18413,"journal":{"name":"Mechanical Sciences","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2022-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47748223","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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: 1