On modeling the bending stiffness of thin semicircular. Kgaa, weinheim 1 introduction because of their very precise, smooth motion compliant mechanisms cm based on. The rotational precision, denoted by the midpoint stiffness, is derived for the purpose of optimized geometric design. Flexure hinges can be viewed as a system of discrete springs. Hingefree compliant mechanism design via the topological. A twostage topological optimum design for monolithic.
Compared with classical rotation joints, the advantages of flexure hinges include monolithic manufacturing, zero backlash and friction, reduced weight, no lubrication, and high precision. Offers answers to the needs of efficient design, analysis, and optimization of devices that incorporate flexure hinges. Flexure hinges hold several advantages over classical rotation joints, including no friction losses, no need for. Multiobjective design optimization of flexure hinges for. Design, flexure hinge, contour, synthesis, compliant mechanisms. This book contains readytouse plots and simple equations describing flexure types that give quick solutions to various applications. The main work conducted in the thesis is outlined as follows. A flexure hinge consists of a flexible, slender region between two adjacent rigid parts that undergo relative limited rotation in a mechanism and is the important constituent of lumped compliant mechanisms. Download it once and read it on your kindle device, pc, phones or tablets.
Design of singleaxis flexure hinges using continuum topology. Flexures are a design feature utilized by design engineers usually mechanical engineers for providing adjustment or compliance in a design. A flexure pivot, utilized in place of bearings for its frictionless adjustment properties. The important issues such as design of flexure hinges for compliant mechanisms, existing compliant mechanisms. It contains readytouse plots and simple equations describing several flexure. Several objective functions simultaneously arise in optimization to enhance the magnification factor in improving the mechanisms performance.
Two preloading screws are used to adjust the preloading force between the psa and gripper mechanism. Design of singleaxis flexure hinges using continuum. The tlet consists of flexure hinges in a series coupled with others in parallel configuration. The approaches can be used for the accelerated synthesis of planar and spatial flexure hingebased compliant mechanisms. Compliant mechanisms offer advantages such as increased performance for example, high precision, low weight, low friction, lower cost such as simplified manufacture, low part count, and ability to miniaturize they make possible micro and nano mechanical devices. A compliant mechanism gains its mobility fully or partially from the compliance of its elastically deformable parts rather than from conventional joints. Modeling and design of flexure hingebased compliant mechanisms. Flexure joints for large range of motion by precision. Howell abstract this paper describes 3dprinted titanium compliant mechanisms for aerospace applications. Compliant mechanisms design of flexure hinges taylor. Due to the flexible element deformation, the flexure hinges with the profiles such as circle, cornerfilleted leaf, and ellipse cannot provide high rotational precision. The flexure revolution, compliant mechanisms applied to watchmaking.
Its really effective, easy to use, and the price is great. Parametric study for asymmetric flexure hinge design for. The circular hinge the dimensionless design graph for the circular. Flexure hinge mechanisms modeled by nonlinear euler. A wellbehaved revolute flexure joint for compliant. New structural design of a compliant gripper based on the. Design of flexure hinges flexure hinges hold several.
After comprehensively describing stateoftheart methods for designing compliant mechanisms, it provides a new topology optimization method for finding new flexure hinges. The circularaxis flexure design adds an extra parameter, the median circle radius, to the regular straightaxis flexure design domain. Compliant mechanisms used in needle design are not solely novel, previous research has demonstrated the benefits to using compliance to allow for steerable needles. Although various flexure hinges with different configurations have been successively proposed, they are often designed based on designers experiences and inspirations. Flexure bearings serve much of the same function as conventional bearings or hinges in applications which require angular compliance. For flexure based compliant mechanisms, flexure hinges are used as their flexible members and are the critically important components. Topology optimization of hinge free compliant mechanisms using the node design variables method is proposed. Design of flexure hinges nicolae lobontiu on amazon. Hybrid compliant mechanism design using a mixed mesh of. Nonintuitive design of compliant mechanisms possessing. Modelbased design of flexure hinges for rectilinear guiding with.
Jul 28, 2015 this paper proposes a topology optimization framework to design compliant mechanisms with a mixed mesh of both beams and flexure hinges for the design domain. Design of flexure hinges nicolae lobontiu flexure hinges hold several advantages over classical rotation joints, including no friction losses, no need for lubrication, no hysteresis, compactness, capacity to be utilized in smallscale applications, ease of fabrication, virtually no assembly, and no required maintenance. A design method for flexurebased com pliant mechanisms on the. This paper describes the design of a unique revolute flexure joint, called a splittube flexure, that enables lumped compliance compliant mechanism design with a considerably larger rangeofmotion than a conventional thin beam flexure, and additionally provides significantly better multiaxis revolute joint characteristics. Two kinds of hinges, that is, the translational hinge and the revolute hinge, are studied. Flexure hinges hold several advantages over classical rotation joints, including no friction losses, no need for lubrication. The design of compliant hinges has been extensively studied in the size and shape level in the literature. Solid state model of the two investigated compliant guiding mechanisms with two different shape versions for the coupler exemplarily shown with circular flexure hinges. A method for topology optimization of hinge free compliant mechanisms with multiple outputs using level set method is presented in this paper. The gripper structure consists of two sr mechanisms.
The focus of this paper is on how to prevent generating the flexible hinges during the process of topology optimization of compliant mechanisms. Pdf a generic compliance modeling method for twoaxis. For devices in precision engineering and increasingly also in the course of technological progress in micromechanical systems and nanotechnology applications, special standards are necessary regarding the drive and motion system. Flowchart of the design methodology of compliant mechanisms with. Design of flexure hinges flexure hinge m1z f1x 1 rigid link f1y rigid link fixed pseudorigidbody model torsional spring figure 1. It is meant as a primer to help engineers design compliant, multiaxis, printed parts that exhibit high performance. A lowstress suspension and a predictable dynamical and thermal behavior can be achieved by a statically determined design while a monolithic design results in no play and no hysteresis in the mechanism. Design of 3dprinted titanium compliant mechanisms ezekiel g. Three flexure hinges for compliant mechanism designs based. However, this was accomplished with the use of an internal actuator 30 or from the beveled tip geometry. As a kind of important flexible joint, twoaxis flexure hinges can realize inplane and out of plane motions and can be used for constructing flexure based spatial compliant mechanisms. In this paper, a new twodimensional, compliant, monolithic piezoactuated microgripper using flexure hinges is reported.
A flexure is a flexible element or combination of elements engineered to be compliant in specific degrees of freedom. For flexurebased compliant mechanisms, flexure hinges are used as their flexible members and are the critically important components. The design variables are changed individually during an optimization process from almost zero to unity where zero values of crosssection means a removal of the element from the set. Topology optimization of hingefree compliant mechanisms with. A twostage topological optimum design for monolithic compliant microgripper integrated with flexure hinges to cite this article. The gripper mechanism is designed using flexure hinges and is actuated by two piezoelectric stack actuators psa. Pdf modelbased design of flexure hinges for rectilinear. Mar 12, 2019 compliant mechanisms have lots of advantages over traditional devices. Compliant mechanisms offer the highprecision coupled with uhv, radiation and. The inplane and out of plane stiffnesses of the flexure hinges are developed. However, because compliant mechanisms are relatively new compared to more traditional devices, it is. Nicolae lobontiu annotation develops the mathematical models for the compliance based design of flexure hinges, and examines the statics and dynamics of flexure based compliant mechanisms. Design of flexure hinges provides practical answers to the present and future needs of efficient design, analysis, and optimization of devices that incorporate flexure hinges. Dec 27, 2002 flexure hinges hold several advantages over classical rotation joints, including no friction losses, no need for lubrication, no hysteresis, compactness, capacity to be utilized in smallscale applications, ease of fabrication, virtually no assembly, and no required maintenance.
Design, analysis and testing of a new compliant compound. Mechanism design figure 1 shows a cad model of the devised compliant gripper. Topological and shape optimization of flexure hinges for. Design and analysis of a multinotched flexure hinge for.
Therefore, the chapter provides a survey of different methods for the general and simplified modeling of the elastokinematic properties of flexure hinges and compliant mechanisms for four hinge. Abstract this paper presents the analytic flexure hinge, involved in design optimization for a compliant mechanism, as a one. Therefore, the chapter provides a survey of different methods for the general and simplified modeling of the elastokinematic properties of flexure hinges and compliant mechanisms for four hinge contours. Design of flexure hinges provides practical answers and directions to the needs of efficiently designing, analyzing, and optimizing devices that include flexure hinges. Related content design, numerical simulation and experimental investigation of an su8. This paper presents a pseudorigidbody model prbm method and virtual work to design and analyze kinematics and dynamics for compliant rotary joints or flexure hinges in the processing of compliant mechanisms. A design method for flexurebased com pliant mechanisms. A flexure bearing is a category of flexure which is engineered to be compliant in one or more angular degrees of freedom. A mechanism meeting high requirements on resolution and stability can be realized by a statically determined monolithic flexure based design.
Pdf modeling and design of flexure hingebased compliant. In the compliant mechanism designs, high rotational precision is one of the crucial factors to be considered. The proposed analytical model gives a new viewpoint on the design of circular flexure hinge based compliant mechanisms. On the design methodology of flexurebased compliant.
Design and analysis of compliant rotary joint scientific. In the literature, modeling of compliant mechanisms incorporating flexure hinges is mainly focused on linear methods. Investigation of circular flexural hinge used in compliant. For fourbar and multi bar compliant mechanisms, the advantages of using long beam joints compared with film or notch joints in terms of the achievable range of motion are described in the literature. A flexure hinge is an innovative engineering solution for providing relative motion between two adjacent stiff members by the elastic deformation of an arbitrary shaped flexible connector. Design of flexure hinges kindle edition by lobontiu, nicolae. All covid19 related research articles, book chapters and information is free to access and available for anyone to read. Forthesecalculations,thegeometryofthe3d hinge is modelled using a 2d quarter of the model, shown in fig. This book covers various topics regarding the design of compliant mechanisms using topology optimization that have attracted a great deal of attention in recent decades. Topology optimization of compliant mechanisms xianmin zhang. Fcm flexure based compliant mechanism fea finite element analysis ffcm flexure based fourbar compliant mechanism prbm pseudorigidbody model. Topological design of hingefree compliant mechanisms using. Three flexure hinges for compliant mechanism designs based on. A computational design tool for compliant mechanisms disney research we present a computational tool for designing compliant mechanisms.
The paper introduces a common twoaxis ellipticalarcfilleted flexure hinge that is generated by two different ellipticalarcfilleted cutout profiles and that provides some new hinge types. Flexure joints for large range of motion by precision engineering lab at. Unlike rigidbody mechanisms, compliant mechanisms cms gain some or all of their motion from relative flexibility of their joints. A flexure hinge is a major component in designing compliant mechanisms that offers unique possibilities in a wide range of application fields in which high positioning accuracy is required. Two kinds of hinges, that is, the translational hinge and the revolute hinge. Compliant mechanisms download ebook pdf, epub, tuebl, mobi. After comprehensively describing state of theart methods for designing compliant mechanisms, it provides a new topology optimization method for finding new flexure hinges. The literature is to be studied in order to gather knowledge about compliant mechanism. Research by the pe lab at the university of twente. The output results from the fem simulations are guiding accuracy.
Design and analysis of a highaccuracy flexure hinge. A design method for flexurebased com pliant mechanisms on. It contains readytouse plots and simple equations describing several flexure types for the professional that needs quick solutions to current applications. Circular flexural joint was manufactured by using al 6061 t6 material and experimental setup. Design and performance analysis of a tlettype flexure hinge. Hinge free compliant mechanism design via the topological. The model was derived from the flexure based mechanism by replacing flexure hinges with rotational springs with equivalent spring stiffness constant calculated from the flexure hinge equations 12. This paper proposes a topology optimization framework to design compliant mechanisms with a mixed mesh of both beams and flexure hinges for the design domain. Our method takes as input a conventional, rigidlyarticulated mechanism defining the topo. Jan 23, 2010 in this paper, a new twodimensional, compliant, monolithic piezoactuated microgripper using flexure hinges is reported. This paper presents the dimensionless empirical equations and graph expressions of three flexure hinges for compliant mechanism designs. Use features like bookmarks, note taking and highlighting while reading compliant mechanisms.
The microgripper is designed, and a comparison study on stress and displacement is done by varying the hinge parameters such as the hinge radius, web thickness, position of flexure hinge, and radius of curvature of hinges. Design of circular crosssection cornerfilleted flexure hinges for threedimensional compliant mechanisms n lobontiu, jsn paine j. Flexure based compliant mechanisms generally refer to mechanical devices gaining some or all of their mobility through elastic deformation of flexible members, which by nature possess the benefits of monolithic structure and variable stiffness over their rigidbody counterparts, thereby reducing friction, backlash, wear, no need for lubrication and assembly. See more ideas about flexible wood, living hinge and properties of materials. Flexure hinges hold several advantages over classical rotation joints, including no friction losses, no need for lubrication, no hysteresis, compactness, capacity to be utilized in smallscale applications, ease of fabrication, virtually no assembly, and no required maintenance. In the proposed method, two types of mean compliances are introduced and built in the proposed multi. Industrial design portfolio portfolio design colorful umbrellas free logo interior design studio revolutionaries designs to draw design art. A living hinge a type of flexure, on the lid of a tic tac box. This complicates both the accurate modeling and purposeful design. In order to permit a large deflection, three lamina emergent torsional flexure hinges are reconfigured to create a new triple lettype flexure hinge tlet in this paper.
Flexure bearings are often part of compliant mechanisms. This arrangement is aimed to enhance the displacement of the joint. Topology optimization of compliant mechanisms xianmin. Kinetostatic and dynamic modeling of flexurebased compliant. This paper presents a method for designing the singleaxis flexure hinges in the topology level.