the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Assembly of reconfigurable Bricardlike mechanisms to form a multimode deployable arch
Ruiming Li
Xianhong Zhang
Shuo Zhang
Ran Liu
Yanan Yao
This paper deals with the construction of a novel family of multimode deployable mechanisms based on reconfigurable Bricardlike mechanisms. By connecting a number of identical threefoldsymmetric (TFS) Bricardlike mechanisms, a multimode deployable arch is proposed for the first time, which can switch between the scissorlike deployable mode and the arch deformable mode through the transition configuration. Then new multimode centerdriven deployable mechanisms can be obtained by connecting three and six multimode deployable arches. The obtained mechanism can switch between the scissorlike deployable mode and spherical deformable mode, and it can be reassembled by adjusting the number of TFS Bricardlike mechanisms to change its size. Finally, physical prototypes of the multimode deployable arch and multimode centerdriven deployable mechanisms are fabricated and tested to validate the feasibility of the proposed approach and analysis.
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Deployable mechanisms have aroused great interest in many researchers in the past few decades due to their potential applications in aerospace engineering (Puig et al., 2010). Currently, most deployable mechanisms are constructed with scissorlike elements (SLEs) and angulated elements (AEs) (Escrig, 1985; You and Pellegrino, 1997; Wohlhart, 2004; Kiper et al., 2008; Hoberman, 2008; Zhao et al., 2009; Bai et al., 2013; Huang et al., 2019).
The above research studies mainly focus on planar SLEs and AEs. Besides, some deployable mechanisms based on other novel units were also presented. Deng et al. (2011) presented a geometric approach for the design and synthesis of deployable singleloop mechanisms with pure revolute joints. Ding et al. (2013) proposed a new prism deployable mechanism based on polyhedral linkages that possesses halfclosed polyhedron characteristics. Cao et al. (2020, 2021) established a method for kinematic analysis of twolayer and twoloop deployable linkages with coupling chains and presented a new doublering trussdeployable satellite antenna mechanism. Cheng et al. (2021) constructed a novel family of umbrellashaped deployable mechanisms based on new multilayer and multiloop spatial deployable linkage units. Wang et al. (2022) presented a novel threelimb deployable mechanism using a set of metamorphic mechanism modules. Guo et al. (2022) designed a trussdeployable antenna mechanism based on the 3RR3URU tetrahedral unit.
In addition to that, spatial singleloop overconstrained linkages are also widely used in deployable mechanisms. Bennett (1903, 1914) proposed a Bennett linkage with 4R joints, and many 5R or 6R overconstrained mechanisms were constructed on the basis of the Bennett linkage (Myard, 1931; Goldberg, 1943; Song and Chen, 2012; Ma et al., 2018). Then Bricard (1897, 1926) discovered six types of Bricard linkages. By analyzing and adjusting geometric parameters of Bricard linkages, Chen et al. (2005) presented a threefoldsymmetric (TFS) Bricard linkage. Owing to the property of good folding performance of singleloop overconstrained linkages, the networking method has become an important construction method of deployable mechanisms. Chen and You (2008b, a) proposed deployable structures formed by interconnected Bennett linkages and constructed a largescale deployable assembly by connecting many 6R linkages derived from an extended Myard linkage. Viquerat et al. (2013) designed a deployable structure that deploys from a compact bundle to a rectangular ring. Qi et al. (2017) constructed large deployable mechanisms by connecting several planesymmetric Bricard linkages. Lu et al. (2019, 2020) presented a family of mechanisms by using the capability of the type III Bricard linkage to be coplanar in two configurations and constructed a network of type III Bricard linkages. Yang et al. (2020) proposed a method to design general deployable hexagonal structures based on alternative forms of TFS Bricard linkages. Song et al. (2020, 2021) proposed a mobility analysis method using screw theory and constructed a series of mechanical networks with TFS Bricard linkages.
However, the deployable mechanism composed of the above units usually has only one mode of motion. To improve the adaptability and flexibility of the deployable mechanism, many reconfigurable mechanisms known as metamorphic mechanisms (Dai and Rees Jones, 1999; Li et al., 2011) and multiple operation mode mechanisms (Kong, 2013) have been emerging in mechanism science and robotics. Wang and Kong (2018a, b) adopted the trihedral Bricard linkage with six identical links as the plane to form multimode deployable polyhedral mechanisms. In our previous studies, a series of construction methods for deployable mechanisms were presented (Li et al., 2016, 2017, 2018, 2019; Sun et al., 2020b, a, 2021). In Liu et al. (2020), a novel family of reconfigurable deployable Bricardlike mechanisms with angulated elements was proposed.
In this paper, we construct a multimode deployable arch by connecting a number of Bricardlike mechanisms. The obtained arch switches between the scissorlike deployable mode and the arch deformable mode through its transition configuration. Further, by connecting three and six identical arches, new multimode deployable mechanisms are proposed, and the obtained mechanism can switch between the scissorlike deployable mode and spherical deformable mode as well. Besides, they can be reassembled to change the size by adjusting the number of Bricardlike mechanisms.
This paper is organized as follows. Section 2 introduces a reconfigurable deployable Bricardlike mechanism with angulated elements. Then, the construction of a multimode deployable arch is explained. In Sect. 3, the assembly of the multimode deployable archderived mechanism is explained. And prototypes of the mechanisms are fabricated to verify the proposed construction method and reassembly feasibility of the mechanism in Sect. 4. Section 5 concludes the paper.
2.1 A reconfigurable deployable Bricardlike mechanism with angulated elements
Based on the unequal diagonal angles of the angulated element (AE), a reconfigurable dualAE unit is designed by articulating two AEs symmetrically at nodes A and B, as shown in Fig. 1a. Parameters of the dualangulatedelement unit satisfy that AC = AC^{′} = BC = BC^{′} = CD = CE = C^{′}F = C^{′}G = L and DH = EI = FJ = GK = l, where ∠BCD = ∠ACE = ∠AC^{′}G = ∠BC^{′}F is denoted by γ; the angle required to rotate BC clockwise to BC^{′} is defined as θ, and the diameter of each node is e. The obtained reconfigurable dualAE unit has two motion modes: scissorlike deployable mode and rotation mode. In scissorlike deployable mode, the dualAE unit can deploy as a scissorlike element, and the distance between the two axes L_{p} is calculated in Eq. (1) and described in Fig. 3.
When nodes A and B coincide with each other, the unit reaches its switching configuration; then the two angulated elements are equivalent to two rigid bars, and the dual AEs are in rotation mode. The dualAE unit becomes two links connected by an R joint, which can make AE2 rotate counterclockwise around AE1. The link lengths of the unit are set as L, and the diameter of each node is e. In order to get a better folding effect and avoid linkage interference, the link angle γ of the AE is derived.
By connecting three dualAE units with spatial RRR chains, a reconfigurable Bricardlike mechanism is constructed, as shown in Fig. 2c. In the RRR chain, the lengths of two links are equal; the axes of the adjacent R joints are perpendicular to each other; and the first and the third R joints are, respectively, parallel to the R joints of its articulated dualAE unit. When nodes A and B coincide, R joints at nodes A and B will replace the virtual R joints to form the Bricard linkage, as shown in Fig. 2d.
The 3D model of the Bricardlike mechanism is shown in Fig. 2. There are two modes for the reconfigurable deployable mechanism including prism deployable mode and Bricard turnover mode. In the prism deployable mode, it can deploy from a bundle shape to a regular triangle loop on a plane. Then it goes into the switching configuration, in which both the prism deployable motion and the Bricard turnover motion can be realized. When three dualAE units turn into the rotation mode by fixing six AEs each as a rigid link, the mechanism switches to the Bricard turnover mode which can perform the same infinite turning motion as a TFS Bricard linkage. To analyze the parameters of the model, the standard model proposed by Denavit and Hartenberg (2021) is used.
As shown in Fig. 2d, the coordinate systems of links of the Bricard linkage are established, where z_{i} is the axis along the revolute axis of joint i, and x_{i} is the axis along the common normal direction from axes z_{i} to z_{i+1}. When nodes A and B coincide with each other, each AE with a link of the RRR chain is fixed as a rigid link, and the six rigid links are connected by six R joints to form a TFS Bricard linkage. The geometric parameters of the Bricard linkage contained in the Bricardlike mechanism satisfy the conditions in Eqs. (4)–(7). And referring to Chen et al. (2005), its closure equations are derived in Eq. (8). Then the relationship curve between θ and φ of the Bricardlike mechanism in the Bricard turnover mode is depicted in Fig. 3.
2.2 Construction of the multimode arch
By connecting a number of identical Bricardlike mechanism units in the switching configuration, a multimode deployable arch is constructed. The serial number of the Bricardlike mechanism unit is denoted by (n), as shown in Fig. 4. In order to ensure the symmetry of the mechanism, it is suggested that n is an odd number. From the top view of the multimode arch, the revolute joints of the ith Bricardlike mechanism are denoted by J_{(2i−1)}, J_{(2i)}, J_{(2i+1)}, J_{(2i+2)}, J_{(2i+3)}, and ${J}_{(\mathrm{2}i+\mathrm{3}{)}^{\prime}}$; the revolute axes J_{(2i−1)}, J_{(2i+1)}, and J_{(2i+3)} are directly out of the paper, while J_{(2i)}, J_{(2i+2)}, and ${J}_{(\mathrm{2}i+\mathrm{3}{)}^{\prime}}$ are parallel to the paper. Therefore, these revolute axes are simplified in Fig. 4, where a dot in a circle represents the direction of the axis pointing out of the paper, and where the dotted line represents the direction of the axis paralleling the paper.
Since the Bricardlike mechanism has 1 degree of freedom (refer to Chen et al. 2005), three identical dual AEs move synchronously. The multimode deployable arch is composed of a number of identical Bricardlike mechanisms, and adjacent Bricardlike mechanisms share their intermediate dual AEs; all of the Bricardlike mechanisms in the arch move synchronously with the first Bricardlike mechanism. Therefore, the multimode deployable arch has 1 degree of freedom as well.
As shown in Fig. 5, the coordinate systems of units (1)–(3) of the deployable arch are established, where z_{i} is the axis along the revolute axis of joint i, and x_{i} is the axis along the common normal direction from axes z_{i} to z_{i+1}. Since the multimode deployable arch is composed of a number of identical Bricardlike mechanisms and they are symmetrically arranged as in Fig. 4, the D–H parameters of the entire arch can be determined by the D–H parameters in Appendix B. As shown in Fig. 8, according to the properties of the threesymmetric Bricard mechanism, the vectors S_{1}, S_{2}, and S_{3} are guaranteed to intersect at a point, which is named O. Additionally, since S_{2} is the vector sum of S_{1} and S_{3} and since S_{4} is the vector sum of S_{3} and S_{5}, then S_{2} and S_{4} will necessarily intersect at point O. Moreover, due to the noncollinearity of P_{2}, P_{4}, and O, they lie in the same plane. As shown in Fig. 5, the arch is constructed using identical Bricardlike mechanisms, and adjacent Bricardlike mechanisms share AEs. As a result, S_{4} and S_{6} also intersect at point O. Therefore, all the triangular envelope surfaces formed by the Bricardlike mechanisms in the arch are coplanar and intersect at point O.
2.3 Scissorlike deployable mode
In the scissorlike deployable mode, φ remains still at 60^{∘}; the mechanism will fold and deploy as the value of θ varies. To avoid link interference, the range of θ in the scissorlike deployable mode is [$\mathrm{3}\mathrm{arcsin}(e/\mathrm{2}L)$, π). Here, we use the length L, the width W, and the height H of the enveloping cuboid to represent the size of the mechanism in the scissorlike deployable mode; here we take 11 Bricardlike units as an example as shown in Fig. 6, and they are derived as follows.
The volume V_{s} of the enveloping cuboid of the mechanism in scissorlike deployable mode is derived in Eq. (12). The lengths of links L, l, and e can be given different values. Suppose L = 15 mm, l = 6 mm, and e = 4 mm, then the mesh grids of V_{s} with respect to θ and n is drawn in Fig. 7.
2.4 Arch deformable mode
In arch deformable mode, the Bricardlike mechanism is in turnover mode; each dual AE mechanism with a link of the RRR chain is fixed as a rigid link with the link length of d_{p}, and the six rigid links are connected by six R joints to form a TFS Bricard linkage, as shown in Fig. 8. Then, an area of the sectorlike figure enclosed by an arch is derived, as shown in Fig. 5.
The origin of the coordinate system is denoted by P_{i} (i = 1, 2, …, 2n+3); the sector along Z_{i} (i = 1, 3, 5, …, 2n+3) is denoted by S_{i}. The following is an example of the first Bricardlike mechanism to show the process of calculating the area of the sectorlike figure enclosed by an arch. After the first coordinate transformation, the position matrix of S_{2} can be obtained; then after the second coordinate transformation, the position matrix of S_{3} can be obtained. The direction of S_{2} can be obtained by adding S_{1} and S_{3}. Similarly, the position and direction of S_{4} can be obtained, as shown in Eqs. (13)–(14).
The intersection point of S_{2} and S_{4} is denoted by O, and the angle between S_{2} and S_{4} is denoted by η; then an isosceles triangle P_{2}OP_{4} can be obtained, and the area of the triangle P_{2}OP_{4} can be obtained.
Since the deployable arch is composed of a number of identical Bricardlike mechanisms in turnover mode, and since the Bricardlike mechanism is symmetrically distributed, the area of the sectorlike figure enclosed by the arch is denoted by S and can be obtained from Eqs. (13)–(19).
The lengths of links L, l, and e can be given different values. Suppose L = 15 mm, l = 6 mm, and e = 4 mm, then the mesh grids of S with respect to θ and n are drawn in Fig. 9.
As shown in Fig. 10, the Bricardlike mechanisms of the arch are changed with the angle of θ, and the shape of the arch is changed accordingly; that is, when the angle of θ of the Bricardlike mechanisms become larger, the Bricardlike mechanisms in the arch will become closer. When the number of Bricardlike mechanisms is greater than or equal to 6, the special configuration (cube shape) appears at $\mathit{\theta}=\frac{\mathit{\pi}}{\mathrm{2}}$. Besides, it is easy to see that the arch radius R is equal to the link length d_{p}.
3.1 Construction of multimode centerdriven deployable mechanism
The multimode deployable arch discussed above can also be used as a construction unit to construct a centerdriven multimode deployable mechanism. As shown in Fig. 11a, the arches are denoted by Aj (j = 1, 2, 3), and the joints in each arch can be denoted as Aj–J_{i} (i = 1, 2, etc.); by connecting revolute joints A1–J_{3} and A2–J_{1}, A2–J_{3} and A3–J_{1}, A3–J_{1} and A1–J_{1} separately, a new multimode deployable mechanism is obtained. Since the whole mechanism is composed of three identical arches, a TFS Bricardlike mechanism is constructed among these three arches. As a result, there are 3n+1 Bricardlike mechanisms connected with each other. When one of the Bricardlike mechanisms moves, the whole mechanism will move synchronously with this Bricardlike mechanism; in other words, the centerdriven multimode deployable mechanism is a 1 degreeoffreedom mechanism.
Based on the above threebranch centerdriven multimode deployable mechanism, revolute joint A4–J_{1} is added to A1–J_{3}(A2–J_{1}), and A4–J_{3} is added to A2–J_{5}. Similarly, with the construction approach above, A5–J_{1} is added to A3–J_{1}(A2–J_{3}), A5–J_{3} is added to A3–J_{5}, A6–J_{1} is added to A1–J_{1}(A3–J_{3}), and A6–J_{3} is added to A1–J_{5}; thus, a sixbranch centraldriven multimode deployable mechanism is constructed. The specific construction method is shown in Fig. 11b.
Since the sixbranch mechanism is composed on the basis of the threebranch mechanism, the three added arches and threebranch mechanism both share the common angulated elements, and the motion of each dual AE of the threebranch mechanism is synchronized, the sixbranch mechanism and the threebranch mechanism both move synchronously; that is, the sixbranch mechanism has 1 degree of freedom as well. In addition, we can change the size of the mechanism by increasing or decreasing the number of the Bricardlike mechanisms in each arch.
Furthermore, as shown in Fig. 12, on the basis of the multimode centerdriven deployable mechanisms, new mechanisms can be obtained by adding shorter arches at different positions of the multimode centerdriven deployable mechanisms. The newly obtained mechanisms still have two motion modes, namely, scissorlike deployable mode and spherical deformable mode, which can be switched through the transition configuration. Furthermore, since the newly added arches still share the common AEs, i.e., all the AEs of the whole mechanism still move synchronously, as a result, the multimode centerdriven deployable mechanisms with arches still have only 1 degree of freedom, and the stiffness of the whole mechanism has been improved. However, in the case that the interference of the links is considered, the more arches added, the smaller deformation range of the mechanism under the spherical transformation mode.
3.2 Scissorlike deployable mode
In the scissorlike deployable mode, φ remains still at 60^{∘}; the spherical mechanism will fold and deploy as the value of θ varies like the arch. To avoid link interference, the range of θ in the scissorlike deployable mode is [$\mathrm{3}\mathrm{arcsin}(e/\mathrm{2}L)$, π) as well. Here, we use V_{3} and V_{6} of the enveloping cuboid to represent the size of the mechanism in the scissorlike deployable mode, respectively; the lengths of links L, l, and e can be given different values. Suppose L = 15 mm, l = 6 mm, and e = 4 mm, then the mesh grids of V_{3} and V_{6} with respect to θ and n are drawn in Fig. 13.
3.3 Spherical deformable mode
When the arch is in arch deformable mode, the length from the position of each revolute joint to the vertex of the sectorlike figure is equal, and the multimode centerdriven deployable mechanism is constructed by connecting three identical arches. The multimode centerdriven deployable mechanism will envelop a spherical mechanism, the radius of the enveloping sphere will change as the value of θ varies, and the multimode centerdriven deployable mechanism is in spherical deformable mode. We use the radius R of the enveloping sphere to represent the size of the mechanism, and it is calculated in Eq. (20), the lengths of links L, l, and e can be given different values. Suppose L = 15 mm, l = 6 mm, and e = 4 mm, then the relationship curve between θ and R of the spherical mechanism in the spherical deformable mode is described in Fig. 14. In addition, when $\mathit{\theta}=\mathrm{33}\mathit{\pi}/\mathrm{36}$, $\mathit{\theta}=\mathrm{17}\mathit{\pi}/\mathrm{18}$, and $\mathit{\theta}=\mathrm{35}\mathit{\pi}/\mathrm{36}$, the states of the mechanism in spherical deformable mode are shown in Fig. 15.
Based on the Bricardlike mechanism, the prototype of a multimode arch is fabricated, as shown in Fig. 16. The link length L and the node diameter e of the AE are 20 and 10 mm. The link length of the 3R, 4R, and 5R chain l is 20 mm, and parameters of the multimode arch are listed in Table 1.
In the scissorlike deployable mode, as shown in Fig. 16a, the variable ranges of width and the height of the enveloping cuboid of the mechanism are [43.30 mm, 102.81 mm] and [20.00 mm, 39.36 mm], respectively. And the magnification ratios of the arch are δ_{h} = 1.97 and δ_{w} = 2.37. In the deformable mode, as shown in Fig. 16b, each Bricardlike unit of the arch is in turnover mode, and the rigid link length of the Bricardlike mechanism is 59.36 mm.
The three multimode arches are assembled, and a prototype of a multimode centerdriven mechanism is fabricated, as shown in Fig. 17. The parameters of the multimode centerdriven mechanism are also listed in Table 1. In scissorlike deployable mode, the variable ranges of radius and the height of the enveloping cuboid of the mechanism are [176.33 mm, 418.69 mm] and [20.00 mm, 39.36 mm], respectively. And the magnification ratios of the arch are δ_{h} = 1.97 and δ_{r} = 2.37. In spherical deformable mode, the variable range of radius of the enveloping sphere of the mechanism is [306.81 mm, 880.68 mm] when θ is in the range [$\mathrm{33}\mathit{\pi}/\mathrm{36}$, $\mathrm{35}\mathit{\pi}/\mathrm{36}$].
Figure 18 shows the prototype of the multimode sixbranch centerdriven mechanism. And the parameters of the mechanism are also listed in Table 1. In scissorlike deployable mode, the variable ranges of radius and the height of the enveloping cuboid of the mechanism are [176.33 mm, 418.69 mm] and [20.00 mm, 39.36 mm], respectively. And the magnification ratios of the arch are δ_{h} = 1.97 and δ_{r} = 2.37. In spherical deformable mode, the variable range of radius of the enveloping sphere of the mechanism is [306.81 mm, 880.68 mm] when θ is in the range [$\mathrm{33}\mathit{\pi}/\mathrm{36}$, $\mathrm{35}\mathit{\pi}/\mathrm{36}$].
A family of multimode deployable mechanisms based on a TFS Bricardlike mechanism is proposed. An arch is designed by connecting a number of identical Bricardlike mechanisms, and two adjacent units share their intermediate links. The obtained arch can switch between the scissorlike deployable mode and the arch deformable mode through the transition configuration. Variable ranges on the length, width, height, and volume of the enveloping cuboid of the mechanism in the scissorlike deployable mode are calculated. Besides, the position and orientation of the revolute joints of the mechanism are analyzed. And the radius and area of the sectorlike figure enclosed by an arch are derived.
Further, the presented arch can be used as a unit to construct multimode centerdriven deployable mechanisms; the volume of the enveloping cuboid of the mechanisms in the scissorlike deployable mode is calculated, and the radius of the mechanism in spherical deformable mode is derived. A physical prototype of the multimode deployable arch is fabricated, and two prototypes of multimode centerdriven deployable mechanisms are manufactured and tested. Therefore, the obtained multimode deployable mechanism can be reassembled into a new size by adjusting the number of Bricardlike mechanisms. The proposed mechanisms enriched the reconfigurable deployable mechanisms, and they can be used in deployable antennas in the future to increase their function and adaptability. Considering the property of folding performance and reassembly feasibility of the multimode arch, referring to Song et al. (2021), the multilayer deployable mechanism will be constructed in the next work.
The closure equation of the spatial singleloop overconstrained 6R mechanism is as follows:
where ${T}_{i,i+\mathrm{1}}$ is the transformation matrix from joint i to joint i+1; when i=6, $i+\mathrm{1}=\mathrm{1}$; I is the identity matrix. The transformation matrix is as follows.
The coordinate systems of two adjacent links connected by revolute joints are shown in Fig. A1: the line along the revolute axis of joint i is set as the coordinate axis z_{i}; the line along the common normal between joint axes z_{i} and z_{i+1} is set as the coordinate axis x_{i}. The D–H parameters are defined as follows: a_{i} is the length of link i(i+1), which is the common normal distance from z_{i} to z_{i+1} positively along the direction of x_{i}; α_{i} is the twist of link i(i+1), which is the rotation angle from z_{i} to z_{i+1} positively along the direction of x_{i}; d_{i+1} is the offset of joint i, which is the common normal from x_{i} to x_{i+1} positively along the direction of z_{i+1}; ${\mathit{\theta}}_{i+\mathrm{1}}^{\prime}$ is the revolute variable of joint i, which is the rotation angle from x_{i} to x_{i+1} positively along the direction z_{i+1}.
All data included in this study are available upon request to the corresponding author.
The supplement related to this article is available online at: https://doi.org/10.5194/ms143872023supplement.
RuL and XZ proposed the idea of the multimode deployable mechanism and developed the structure scheme. XZ prepared the figures and wrote this paper. RuL, SZ, RaL, and YY edited the paper.
The contact author has declared that none of the authors has any competing interests.
Publisher’s note: Copernicus Publications remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
The authors would like to thank the reviewers for their valuable comments and suggestions that enabled us to revise the paper.
This research has been supported by the Fundamental Research Funds for the Central Universities (grant no. 2021RC252) and National Natural Science Foundation of China (grant no. 51905015).
This paper was edited by Daniel Condurache and reviewed by three anonymous referees.
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