To see the other types of publications on this topic, follow the link: Manipulator (Mechanism).

Dissertations / Theses on the topic 'Manipulator (Mechanism)'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 dissertations / theses for your research on the topic 'Manipulator (Mechanism).'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.

1

Hopkins, Brian. "Modified ParaDex: Theory and hardware implementation of a 6-prismatic-spherical-universal parallel manipulator." Ohio : Ohio University, 2001. http://www.ohiolink.edu/etd/view.cgi?ohiou1173899557.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Alberts, Thomas Edward. "Augmenting the control of a flexible manipulator with passive mechanical damping." Diss., Georgia Institute of Technology, 1986. http://hdl.handle.net/1853/19442.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Tahboub, Karim Abdul Majid. "Digital control for flexible manipulator arms." Thesis, Georgia Institute of Technology, 1986. http://hdl.handle.net/1853/17210.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Moon, Suk-Min. "Active damping control of a compliant base manipulator." Ohio : Ohio University, 1999. http://www.ohiolink.edu/etd/view.cgi?ohiou1175797025.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Lee, Kam-fat Jonathan. "Design and control of a robotic manipulator with an active pneumatic balancing system /." [Hong Kong] : University of Hong Kong, 1992. http://sunzi.lib.hku.hk/hkuto/record.jsp?B13194367.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Wilson, Thomas Rowe. "The design and construction of a flexible manipulator." Thesis, Georgia Institute of Technology, 1986. http://hdl.handle.net/1853/17354.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Shelly, Michael Patrick. "Modeling and dynamic simulation of a closed chain free-floating planar manipulator." Ohio : Ohio University, 1992. http://www.ohiolink.edu/etd/view.cgi?ohiou1173217900.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

George, Lynnane E. "Active vibration control of a flexible base manipulator." Diss., Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/17115.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Saur, Clemens M. "Evaluation of manipulator boom designs for lunar vehicles." Thesis, Georgia Institute of Technology, 1993. http://hdl.handle.net/1853/25101.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Arjunan, Shankar. "Design of a piezo-electric actuated micro-motion manipulator." Diss., Georgia Institute of Technology, 1988. http://hdl.handle.net/1853/19408.

Full text
APA, Harvard, Vancouver, ISO, and other styles
11

Zhao, Xing. "The design and control of uncertain manipulator arms with decoupled inertia matrix." Diss., Georgia Institute of Technology, 1991. http://hdl.handle.net/1853/12251.

Full text
APA, Harvard, Vancouver, ISO, and other styles
12

Obergfell, Klaus. "A vision-based end-point control for a two-link flexible manipulator." Thesis, Georgia Institute of Technology, 1991. http://hdl.handle.net/1853/17654.

Full text
APA, Harvard, Vancouver, ISO, and other styles
13

Johnson, Roger Warren. "Design and development of a three link in-parallel actuating prototype manipulator." Thesis, Georgia Institute of Technology, 1988. http://hdl.handle.net/1853/15961.

Full text
APA, Harvard, Vancouver, ISO, and other styles
14

Huggins, James D. "Experimental verification of a model of a two-link flexible, lightweight manipulator." Thesis, Georgia Institute of Technology, 1988. http://hdl.handle.net/1853/16767.

Full text
APA, Harvard, Vancouver, ISO, and other styles
15

Smith, Anthony Lawrence. "Adaptive control of a three link in-parallel manipulator." Thesis, Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/17957.

Full text
APA, Harvard, Vancouver, ISO, and other styles
16

Letchworth, Gary Franklin. "Computer graphics simulation of two link flexible manipulator arm motions." Thesis, Georgia Institute of Technology, 1986. http://hdl.handle.net/1853/15870.

Full text
APA, Harvard, Vancouver, ISO, and other styles
17

Kwon, Dong-Soo. "An inverse dynamic tracking control for bracing a flexible manipulator." Diss., Georgia Institute of Technology, 1991. http://hdl.handle.net/1853/15876.

Full text
APA, Harvard, Vancouver, ISO, and other styles
18

Magee, David Patrick. "Dynamic control modification techniques in teleoperation of a flexible manipulator." Thesis, Georgia Institute of Technology, 1991. http://hdl.handle.net/1853/16090.

Full text
APA, Harvard, Vancouver, ISO, and other styles
19

Garimella, Rao. "Kinematics and motion planning of a free-floating closed-chain planar manipulator." Ohio : Ohio University, 1992. http://www.ohiolink.edu/etd/view.cgi?ohiou1172683118.

Full text
APA, Harvard, Vancouver, ISO, and other styles
20

譚漢雄 and Hon-hung Tam. "Robust robot-manipulator control using hybrid H-infinity/adaptive controller structures." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1998. http://hub.hku.hk/bib/B31219925.

Full text
APA, Harvard, Vancouver, ISO, and other styles
21

Tam, Hon-hung. "Robust robot-manipulator control using hybrid H-infinity/adaptive controller structures /." Hong Kong : University of Hong Kong, 1998. http://sunzi.lib.hku.hk/hkuto/record.jsp?B19712704.

Full text
APA, Harvard, Vancouver, ISO, and other styles
22

李錦發 and Kam-fat Jonathan Lee. "Design and control of a robotic manipulator with an active pneumatic balancing system." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1992. http://hub.hku.hk/bib/B31210429.

Full text
APA, Harvard, Vancouver, ISO, and other styles
23

Ward, Keith Ronald. "Pseudo joint damping for reactive control of a mobile manipulator." Thesis, Georgia Institute of Technology, 1993. http://hdl.handle.net/1853/17634.

Full text
APA, Harvard, Vancouver, ISO, and other styles
24

Boucher, Daniel Charles. "Closed loop end piece control of a servo controlled manipulator." Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/25054.

Full text
Abstract:
This thesis discusses the possibility of attaining closed loop end piece control of a servo controlled manipulator by externally modifying the independent control loop set point of each robot link. This procedure leaves the existing servo control loops intact and thus has the benefit of acquiring the advantages of an advanced control strategy while retaining the inherent reliability and stability of the existing control loops. Algorithms are proposed for compensating for known disturbance torques, eliminating end piece position errors, and applying specified forces to the surroundings with the end piece. These algorithms are demonstrated for the three degree of freedom case using a simulation package ROBSIM.FOR which simulates the response of a servo controlled manipulator to set point inputs. To compensate for known disturbance torques the torques generated by the robot control system are assumed to be directly proportional to the changes in set points. These approximate relations are used to estimate the adjustment in set points necessary to generate the required additional joint torques. Simulation results show that this method is effective in compensating for gravity disturbance torques. The Jacobian relates changes in position of the end piece to changes in joint angles. Using the Jacobian combined with a weighting factor to prevent overshoot an algorithm is developed which drives end piece position errors to zero. The transpose of the Jacobian is used to relate forces exerted on the surroundings by the end piece to generated joint torques. The required torques are created by adjusting the set points. Simulation results indicate that this method can be used to exert specified forces. Force control is more difficult to achieve than position control because the robot interacts physically with its surroundings. The ability of the robot to exert forces depends strongly on the robot's configuration. All work in this thesis can be generated using the single program ROBSIM.FOR.<br>Applied Science, Faculty of<br>Mechanical Engineering, Department of<br>Graduate
APA, Harvard, Vancouver, ISO, and other styles
25

Aboussouan, Patrick. "Frequency response estimation of manipulator dynamic parameters." Thesis, McGill University, 1986. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=65927.

Full text
APA, Harvard, Vancouver, ISO, and other styles
26

Magee, David Patrick. "Optimal arbitrary time-delay filtering to minimize vibration in elastic manipulator systems." Diss., Georgia Institute of Technology, 1996. http://hdl.handle.net/1853/15891.

Full text
APA, Harvard, Vancouver, ISO, and other styles
27

Girvin, Douglas Lynn. "Numerical analysis of right-half plane zeros for a single-link manipulator." Thesis, Georgia Institute of Technology, 1992. http://hdl.handle.net/1853/16945.

Full text
APA, Harvard, Vancouver, ISO, and other styles
28

Cordle, William H. "Numerical inverse kinematics for a six-degree-of-freedom manipulator." Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-12052009-020222/.

Full text
APA, Harvard, Vancouver, ISO, and other styles
29

Vittor, Timothy R. Mechanical &amp Manufacturing Engineering Faculty of Engineering UNSW. "Modular decentralized control and design of a reconfigurable redundant manipulator." Awarded by:University of New South Wales. Mechanical & Manufacturing Engineering, 2007. http://handle.unsw.edu.au/1959.4/40433.

Full text
Abstract:
Soft automation employs multi-functional robotic manipulators where dexterity, versatility and reconfigurability are now becoming key issues. For manipulators used in these circumstances, hyper-redundancy in configuration is essential. A typical application envisaged, is manipulator movement in unpredictable surroundings such as navigation amongst branches and foliage in automated fruit picking. This requires motion of a manipulator in an unmapped dynamic environment to find its way to the goal i.e. the fruit. To date, centralized control architectures have proven impractical for the control of redundant systems because the full environment needs to be mapped, there are time constraints on the computation required and, simultaneously, algorithms for obstacle avoidance must be enacted. Decentralized control of manipulators complements modular construction because the need for a full environment reconstruction in one master controller is bypassed by having localized sub-goals for each module. Time constraints are removed because the control algorithms are much simpler. Obstacle avoidance is localized. Manipulators constructed modularly are effective because they allow for reconfiguration and ease of fault diagnosis. For modular manipulators to be a more effective option as a subclass of robots, the conditions under which the interactive movements of modules are stable become a major issue. When a general review of hyper-redundant manipulators was undertaken, no published implementation of Modular Decentralized Control (MDC) was discovered. This thesis explored the use of a modular decentralized technique to create stable control of a redundant manipulator system. The computational burden was minimized by restricting inverse kinematics to within each module. Advantages of the approach taken were the ease of implementation of obstacle avoidance, reconfigurability and fault tolerance. Having firstly simulated a MATLAB version of stable motion using MDC on a modular manipulator with up to six identical modules, the technique was extended with state space analysis to redefine the limits of stable control of a hyper-redundant manipulator. The MDC study mapped motion profile types that were dependant on the initial manipulator configuration and goal position and, thereby, investigated possible instabilities in the system. A two-link, single degree of freedom system was initially explicated followed by an extension of the stability analysis to an n-module two degree of freedom system. A stability theory utilizing decentralized control was formed. Simulation results showed dynamic motion, path generation and obstacle avoidance capabilities in unmapped environments to be stable. The modeling redefined the bounds of stable control, showing that classical stability via Root Locus, now required only two roots from the characteristic equation to be stable for a selection of path trajectory to the goal to be found. The remaining roots could be unstable in traversing to the goal and settling at a marginal stability point when the goal was reached. The marginal stability was a reflection of the pseudo-independence given to each module in seeking the goal and differed radically from a standard Root Locus analysis and interpretation of stability. A hyper-redundant Reconfigurable Modular Manipulator System (RMMS) was designed and built to implement the MDC technique in a real world environment. From an initial design, five modules were constructed and control algorithms embedded appropriate to their position in a five-segment robotic manipulator. A stereoscopic vision system was attached to the end of the manipulator which supplied real time data on a goal in 3D Cartesian space. The data was supplied to the first module of the arm and subsequently to all others by localized homogenous transformation. The manipulator was tested for goal seeking, path following, obstacle avoidance, fault tolerance and reconfigurability. The arm produced stable motion and satisfied the criteria as hypothesized in the theory.
APA, Harvard, Vancouver, ISO, and other styles
30

Poling, Dana B. "Spherically-actuated platform manipulator." Ohio : Ohio University, 2000. http://www.ohiolink.edu/etd/view.cgi?ohiou1172775949.

Full text
APA, Harvard, Vancouver, ISO, and other styles
31

Johnson, Kevin Matthew. "Development of a statically balanced parallel platform manipulator." Thesis, Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/15947.

Full text
APA, Harvard, Vancouver, ISO, and other styles
32

Maneewarn, Thavida. "Haptic feedback of manipulator kinematic conditioning for teleoperation /." Thesis, Connect to this title online; UW restricted, 2000. http://hdl.handle.net/1773/6107.

Full text
APA, Harvard, Vancouver, ISO, and other styles
33

Salerno, Robert James. "Positional control strategies for a modular, long-reach, truss-type manipulator." Diss., This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-06062008-173031/.

Full text
APA, Harvard, Vancouver, ISO, and other styles
34

余永康 and Wing-hong William Yu. "On application of vision and manipulator with redunduncy to automatic locating and handling of objects." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1989. http://hub.hku.hk/bib/B31232073.

Full text
APA, Harvard, Vancouver, ISO, and other styles
35

Yu, Wing-hong William. "On application of vision and manipulator with redunduncy to automatic locating and handling of objects /." [Hong Kong] : University of Hong Kong, 1989. http://sunzi.lib.hku.hk/hkuto/record.jsp?B1275142X.

Full text
APA, Harvard, Vancouver, ISO, and other styles
36

Yien, Christopher Edward. "Control of a three-link in-parallel manipulator for manufacturing applications." Thesis, Georgia Institute of Technology, 1989. http://hdl.handle.net/1853/17519.

Full text
APA, Harvard, Vancouver, ISO, and other styles
37

Feng, Jingbin. "Quasi-Static Deflection Compensation Control of Flexible Manipulator." PDXScholar, 1993. https://pdxscholar.library.pdx.edu/open_access_etds/4759.

Full text
Abstract:
The growing need in industrial applications of high-performance robots has led to designs of lightweight robot arms. However the light-weight robot arm introduces accuracy and vibration problems. The classical robot design and control method based on the rigid body assumption is no longer satisfactory for the light-weight manipulators. The effects of flexibility of light-weight manipulators have been an active research area in recent years. A new approach to correct the quasi-static position and orientation error of the end-effector of a manipulator with flexible links is studied in this project. In this approach, strain gages are used to monitor the elastic reactions of the flexible links due to the weight of the manipulator and the payload in real time, the errors are then compensated on-line by a control algorithm. Although this approach is designed to work for general loading conditions, only the bending deflection in a plane is investigated in detail. It is found that a minimum of two strain gages per link are needed to monitor the deflection of a robot arm subjected to bending. A mathematical model relating the deflections and strains is developed using Castigliano's theorem of least work. The parameters of the governing equations are obtained using the identification method. With the identification method, the geometric details of the robot arms and the carrying load need not be known. The deflections monitored by strain gages are fed back to the kinematic model of the manipulator to find the position and orientation of the end-effector of the manipulator. A control algorithm is developed to compensate the deflections. The inverse kinematics that includes deflections as variables is solved in closed form. If the deflections at target position are known, this inverse kinematics will generate the exact joint command for the flexible manipulator. However the deflections of the robot arms at the target position are unknown ahead of time, the current deflections at each sampling time are used to predict the deflections at target position and the joint command is modified until the required accuracy is obtained. An experiment is set up to verify the mathematical model relating the strains to the deflections. The results of the experiment show good agreement with the model. The compensation control algorithm is first simulated in a computer program. The simulation also shows good convergence. An experimental manipulator with two flexible links is built to prove this approach. The experimental results show that this compensation control improves the position accuracy of the flexible manipulator significantly. The following are the brief advantages of this approach: the deflections can be monitored without measuring the payload directly and without the detailed knowledge of link geometry~ the manipulator calibrates itself with minimum human intervention; the compensation control algorithm can be easily integrated with the existing uncompensated rigid-body algorithm~ it is inexpensive and practical for implementation to manipulators installed in workplaces.
APA, Harvard, Vancouver, ISO, and other styles
38

Grudić, Gregory Z. "Iterative inverse kinematics with manipulator configuration control and proof of convergence." Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/42018.

Full text
Abstract:
A complete solution to the inverse kinematics problem for a large class of practical manipulators, which includes manipulators with no closed form inverse kinematics equations, is presented in this thesis. A complete solution to the inverse kinematics problem of a manipulator is defined as a method for obtaining the required joint variable values to establish the desired endpoint position, endpoint orientation, and manipulator configuration; the only requirement being that the desired solution exists. For all manipulator geometries that satisfy a set of conditions (THEOREM I), an algorithm is presented that is theoretically guaranteed to always converge to the desired solution (if it exists). The algorithm is extensively tested on two complex 6 degree of freedom manipulators which have no known closed form inverse kinematics equations. It is shown that the algorithm can be used in real time manipulator control. Applications of the method to other 6 DOF manipulator geometries and to redundant manipulators are discussed.<br>Applied Science, Faculty of<br>Electrical and Computer Engineering, Department of<br>Graduate
APA, Harvard, Vancouver, ISO, and other styles
39

Chen, Xi Gang. "Design and analysis of a new parallel micro-manipulator utilizing bridge amplifier structure and constant force mechanism for precise assembly system." Thesis, University of Macau, 2018. http://umaclib3.umac.mo/record=b3948884.

Full text
APA, Harvard, Vancouver, ISO, and other styles
40

Li, Siyan. "Motion planning and animation of a hyper-redundant planar manipulator." Ohio : Ohio University, 1994. http://www.ohiolink.edu/etd/view.cgi?ohiou1178132146.

Full text
APA, Harvard, Vancouver, ISO, and other styles
41

Keselman, Leo. "Motion planning for redundant manipulators and other high degree-of-freedom systems." Thesis, Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/51895.

Full text
Abstract:
Motion planning for redundant manipulators poses special challenges because the required inverse kinematics are difficult and not complete. This thesis investigates and proposes methods for motion planning for these systems that do not require inverse kinematics and are potentially complete. These methods are also compared in performance to standard inverse kinematics based methods.
APA, Harvard, Vancouver, ISO, and other styles
42

Dangelmaier, Heidi Therese. "A qualitative representation for manipulator kinematics and other vector and scalar fields." Thesis, University of British Columbia, 1989. http://hdl.handle.net/2429/28970.

Full text
Abstract:
Over the last several years a branch of Artificial Intelligence called Qualitative Reasoning has received much attention. A qualitative reasoner use qualitative values such as increasing, boiling and turbulent to analyze the behavior of physical systems. Existing qualitative frameworks have focused on physical systems whose qualitative values can be identified given the value of a single parameter. This precludes the application of qualitative models to physical systems whose properties require the values of several parameters. An example of such a system is the kinematics of a robotic manipulator. With this motivation, this thesis answers the following: What is a Qualitative model? Although current approaches appear diverse, they share a common mathematical foundation. This foundation is used to reformulate the qualitative model as a set of equivalence relations. The other question answered is: What extensions are needed to handle multivariate properties such as those encountered in the manipulator paradigm? The equivalence classes associated with qualitative models are geometrically shown to be connected hyperspaces. We show that existing frameworks are limited in the types of hyperspaces they can represent. The major ideas in this thesis are illustrated using manipulator kinematics.<br>Science, Faculty of<br>Computer Science, Department of<br>Graduate
APA, Harvard, Vancouver, ISO, and other styles
43

Dang, Anh X. H. "Theoretical and experimental development of an active acceleration compensation platform manipulator for transport of delicate objects." Diss., Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/17277.

Full text
APA, Harvard, Vancouver, ISO, and other styles
44

Du, Plessis Lukas Johannes. "An optimization approach to the determination of manipulator workspaces." Diss., Pretoria : [s.n.], 1999. http://upetd.up.ac.za/thesis/available/etd-06012009-145209/.

Full text
APA, Harvard, Vancouver, ISO, and other styles
45

Pandravada, Ratnam. "Kinematics and motion planning of a rolling disk between two planar manipulators." Ohio : Ohio University, 1996. http://www.ohiolink.edu/etd/view.cgi?ohiou1178049004.

Full text
APA, Harvard, Vancouver, ISO, and other styles
46

Chan, Edmon. "Design and Implementation of a High Speed Cable-Based Planar Parallel Manipulator." Thesis, University of Waterloo, 2005. http://hdl.handle.net/10012/835.

Full text
Abstract:
Robotic automation has been the major driving force in modern industrial developments. High speed pick-and-place operations find their place in many manufacturing applications. The goal of this project is to develop a class of high speed robots that has a planar workspace. The presented robots are intended for pick-and-place applications that have a relatively large workspace. In order to achieve this goal, the robots must be both stiff and light. The design strategies adapted in this study were expanded from the research work by Prof Khajepour and Dr. Behzadipour. The fundamental principles are to utilize a parallel mechanism to enhance robot stiffness and cable construction to reduce moving inertia. A required condition for using cable construction is the ability to hold all cables under tension. This can only be achieved under certain conditions. The design phase of the study includes a static analysis on the robot manipulator that ensures certain mechanical components are always held under tension. This idea is extended to address dynamic situations where the manipulator velocity and acceleration are bounded. Two concept robot configurations, 2D-Deltabot, and 2D-Betabot are presented. Through a series of analyses from the robot inverse kinematic model, the dynamic properties of a robot can be computed in an effective manner. It was determined that the presented robots can achieve 4g acceleration and 4m/s maximum speed within their 700mm by 100mm workspace with a pair of 890W rotary actuators controlling two degrees of freedom. The 2D-Deltabot was chosen for prototype development. A kinematics calibration algorithm was developed to enhance the robot accuracy. Experimental test results had shown that the 2D-Deltabot was capable of running at 81 cycles per minute on a 730mm long pick-and-place path. Further experiments showed that the robot had a position accuracy of 0. 62mm and a position repeatability of 0. 15mm, despite a few manufacturing errors from the prototype fabrication.
APA, Harvard, Vancouver, ISO, and other styles
47

Nyzen, Robert J. "Analysis and control of an eight degree-of-freedom manipulator." Ohio : Ohio University, 1999. http://www.ohiolink.edu/etd/view.cgi?ohiou1175796367.

Full text
APA, Harvard, Vancouver, ISO, and other styles
48

Nyzen, Ronald A. "Spherically-actuated platform manipulator with passive prismatic joints." Ohio : Ohio University, 2002. http://www.ohiolink.edu/etd/view.cgi?ohiou1174930163.

Full text
APA, Harvard, Vancouver, ISO, and other styles
49

Hay, Alexander Morrison. "Optimal dimensional synthesis of planar parallel manipulators with respect to workspaces." Thesis, Pretoria : [s.n.], 2004. http://upetd.up.ac.za/thesis/available/etd-05042005-162107/.

Full text
APA, Harvard, Vancouver, ISO, and other styles
50

Kaše, Vladimír. "Zdvihací a manipulační zařízení pro podvěsné příslušenství letadla." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2012. http://www.nusl.cz/ntk/nusl-230373.

Full text
Abstract:
The thesis is dealing with the design proposal of mobile handling equipment for the aircrafts´ overhead accessory. In its initial part it describes different types of manipulators in use, following by several possibilities how to solve the problematics. The main part of the thesis is focused on concrete solution and construction of such manipulating facility, including the strength and control calculations.
APA, Harvard, Vancouver, ISO, and other styles
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!