A novel methodology for the development of compliant mechanisms with application to feed units

Wulfsberg, Jens P.; Lammering, Rolf; Schuster, Thomas; Kong, Nanxi; Rösner, Malte; Bauma, Elisabeth; Friedrich, R

doi:10.1007/s11740-013-0472-4

Cited by 16 publications

(7 citation statements)

References 10 publications

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“…The output displacements conflate and then be amplified by actuating the ends of LAM3 in the second stage. According to the lever amplification principle, the amplification ratio of the DLAM [90]; (e) Differential lever amplifier [91]; (f) Micromanipulation for cell [92]; (g) Lever-bridge type amplifier [93]; (h) Five-bar amplifier [94]; (i) SR-lever amplifier [74]; (j) Dual-drive bridge-type amplifier [103], [104]; (k) Dual-drive bridge-lever amplifier [106]; (l) honeycomb link amplifier [112]; (m) Exponential strain amplifier [25], [113]. can be written as…”

Section: B Multistage Amplifiermentioning

confidence: 99%

“…Multi-drive amplifier affords another solution for stroke enhancement without paying the cost mentioned above. Kohrs et al [103], [104] serially connected the output ends of two double-sides BAMs in a plane. The displacements at the other output ends are converged and further amplified via a half of BAM arranged on another layer, as shown in FIGURE 4 (j).…”

Section: Multi-drive Amplifiermentioning

confidence: 99%

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A Review on the Flexure-Based Displacement Amplification Mechanisms

et al. 2020

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Multifarious flexure-based displacement amplifiers have been proposed and studied in the past decades, showing importance in many industrial fields, such as bioengineering, optical instruments, and semiconductor technology. Displacement amplifiers provide precise motion and large stroke through a simple and low-cost way compared with other piezoelectric actuators. Those merits have opened a door for new and advanced micro devices with unprecedented performance. This paper aims to proffer a comprehensive review on the design, modeling, characteristics, and applications of flexure-based displacement amplifiers, following by pointing out the inherent drawbacks in this research area such as amplification ratio limit, parasitic motion, low lateral stiffness, low natural frequency, and discussing existing solutions and some potential research directions in those topics. Finally, a summary is concluded and the future development perspectives of the displacement amplifiers are discussed. This review contributes to giving a comprehensive understanding of the displacement amplifier, which provides guidance on designing new displacement amplifiers for improving their mechanical output performance. It is also expected to be instrumental for related researchers to understand displacement amplifiers, and to successfully select and design for specific applications.

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Section: B Multistage Amplifiermentioning

confidence: 99%

Section: Multi-drive Amplifiermentioning

confidence: 99%

A Review on the Flexure-Based Displacement Amplification Mechanisms

et al. 2020

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“…A new approach to enable feed units for small machine tools producing small workpieces is based on the application of compliant mechanisms (CM) being a monolithic structure composed of flexure hinges (FH) and their stiff connections, see [1] for details. A flexure hinges provides relative motion between two adjacent stiff members by locally decreased bending stiffness being achieved by a variable cross-section.…”

Section: Common Modeling Techniquesmentioning

confidence: 99%

Kinematic modeling of flexure hinges and compliant mechanisms

Roesner

Lammering

2014

Proc Appl Math and Mech

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In this paper, the kinematic performance of flexure hinges and compliant mechanisms calculated by conventional modeling techniques are compared. As these exhibit certain drawbacks with regard to control strategies, mainly large number of degrees of freedom or unacceptable errors, a novel modeling approach for flexure hinges is presented. Instead of the entire flexure hinge only its significant regions are modeled by 3-D structural solids. These master patterns are positioned appropriately and connected by rigid constraint conditions to build a compliant mechanism. The resulting model is characterized by considerably fewer degrees of freedom than a full solid model as well as a marginal deviation of the deflection compared to that of pseudorigid-body models, 3-D tapered finite beam elements and analytical Timoshenko beam theory.A new approach to enable feed units for small machine tools producing small workpieces is based on the application of compliant mechanisms (CM) being a monolithic structure composed of flexure hinges (FH) and their stiff connections, see [1] for details. A flexure hinges provides relative motion between two adjacent stiff members by locally decreased bending stiffness being achieved by a variable cross-section. Its elastic deformation and therewith its kinematical properties depend on the geometric parameters and the material, respectively. In this work, different modeling techniques for flexure hinges with application to control strategies of compliant mechanisms are investigated including pseudo-rigid body modeling (PRBM) [2], Timoshenko beam theory (TBT) [3] and finite element methodology (FEM). The main results are listed in Table 1.The application of structural solid elements in 3-D finite element analysis reveals that the kinematic characteristics and significantly deformed region strongly depend on the flexure hinges' geometric parameters and may not be confined to the flexure hinge itself but also on the adjacent structure, especially for thick hinges. Table 1: Summary of advantages and disadvantages of the different modeling approaches Model Advantages Disadvantages FEM + accurate results -multitude of DOF + easy to generate -inapplicable for control TBT + analytical model -imprecise results + easy to implement -inapplicable for CMs PRBM + few DOF -imprecise results + easy to implement -inapplicable for CMs 2 Significant regions of flexure hingesAs depicted in Figure 1(a) and being valid for almost all types of FHs, only minor parts of the structure contribute to the overall performance of the FH. Therewith, an essential reduction of DOF is achieved by taking into account only relevant structural regions for adapted meshing to obtain a master model of that specific FH having less DOF than complete solid modeling strategies. This motivates the selection of the significantly deformed zone (which needs to be independent of the absolute load value) by means of a tolerance value t SR and the occuring von Mises stress. The nodes and corresponding finite elements, for which t SR · σ vM is...

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“…As to bridge-type amplifiers, for instance, Lobontiu and Garcia [2] presented a mathematical model for the classic bridge-type compliant mechanism based on Castigliano's second theorem for the purpose of optimizing its performance; Mottard and St-Amant [3] demonstrated that optimizing the orientation of the flexure hinges in a bridgetype amplifier can significantly increase the amplification ratio and reduce the maximum stress; Choi et al [4] arranged two bridgetype amplifiers in parallel to further increase the travel range; Kim et al [5] proposed a 3-D amplifier which consists of two orthogonally connected bridge-type amplifiers. Xu and Li [6] presented a compound bridge-type amplifier to increase the transverse stiffness; Wulfsberg et al [7] demonstrated a two-stage bridge-type amplifier that utilizes three compound bridge-type amplifiers with two individual actuators. Regarding to lever-type amplifiers, for example, Yong et al [8] utilized a lever-type amplifier in each axis of their flexure-based XY stage to amplify the displacement of the piezoelectric stack actuator; Choi et al [9] presented a symmetric two-stage lever-type amplifier to amplify the input of a piezoelectric actuator; Su and Yang [10] presents a general design theory for lever-type amplifiers including single-stage and multistage levers.…”

Section: Introductionmentioning

confidence: 99%

A tensural displacement amplifier employing elliptic-arc flexure hinges

Chen

2016

Sensors and Actuators A: Physical

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A novel methodology for the development of compliant mechanisms with application to feed units

Cited by 16 publications

References 10 publications

A Review on the Flexure-Based Displacement Amplification Mechanisms

A Review on the Flexure-Based Displacement Amplification Mechanisms

Kinematic modeling of flexure hinges and compliant mechanisms

A tensural displacement amplifier employing elliptic-arc flexure hinges

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