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Model Based Adaptive Control and Disturbance Compensation for Underwater Vehicles
Chinese Journal of Mechanical Engineering volume 31, Article number: 19 (2018)
Abstract
Underwater vehicles are being emphasized as highly integrated and intelligent devices for a significant number of oceanic operations. However, their precise operation is usually hindered by disturbances from a tether or manipulator because their propellers are unable to realize a stable suspension. A dynamic multibody modelbased adaptive controller was designed to allow the controller of the vehicle to observe and compensate for disturbances from a tether or manipulator. Disturbances, including those from a tether or manipulator, are deduced for the observation of the controller. An analysis of a tether disturbance covers the conditions of the surface, the underwater area, and the vehicle end point. Interactions between the vehicle and manipulator are mainly composed of coupling forces and restoring moments. To verify the robustness of the controller, pathfollowing experiments on a streamlined autonomous underwater vehicle experiencing various disturbances were conducted in Song Hua Lake in China. Furthermore, pathfollowing experiments for a tethered open frame remote operated vehicle were verified for accurate cruising with a controller and an observer, and vehicle and manipulator coordinate motion control during the simulation and experiments verified the effectiveness of the controller and observer for underwater operation. This study provides instructions for the control of an underwater vehicle experiencing disturbances from a tether or manipulator.
Introduction
Several oceanic operations are essential for marine rescue, offshore exploration, and industrial use [1]. Impressive results of highly integrated underwater vehicles have been achieved, including the REMUS100 autonomous underwater vehicle (AUV) [2], Bluefin AUV [3], Autosub (AUV) [4], Hugin AUV [5], Seaeye Falcon remote operated vehicle (ROV) [6], H2000 ROV of the French ECA group, SMD ROV [7], ALIVE IAUV [8], SAUVIM IAUV [9], and Girona 500 IAUV [10].
In general, an underwater vehicle is usually designed to be positively buoyant to ensure safety. The shapes of such vehicles are varied based on their particular purposes [11]. For example, an AUV is usually slender and streamlined for low resistance and long endurance cruising, whereas large and midsized ROVs usually have an open frame designed for carrying equipment. For underwater surveys and operations, precise control is very important because the quality of the data obtained and the efficiency during a lengthy operation are highly dependent on the type of vehicle control [12]. A considerable number of studies have been carried out on various control strategies. Adaptive control methods, such as adaptive PD control [13], adaptive neural network control [14], and adaptive sliding control [15] have been proposed for the precise control of underwater vehicles and to overcome uncertainty and external disturbances in the hydrodynamic coefficients. However, accurate control of an underwater vehicle is difficult when confronted with currents or disturbances, coupled with nonlinear motions from a tether or manipulator [16, 17].
To eliminate control errors and improve the response, disturbance modeling and compensation appear to be necessary [18], particularly owing to the maneuverability limitation of a propeller [19]. To improve the vertical plane response of an AUV, Hsu et al. [11] modified a switching integral control loop based on vertical plane modeling, which improves the transient response and eliminates steadystate depth errors. Dantas et al. [18] proposed a linear quadratic Gaussian with a loop robust controller based on disturbances and a vehicle shape filter, which improves the pitch response of an AUV and reduces the amplitude of the oscillations. Peymani et al. [20] proposed an AUV pathmaneuvering controller in which the motion control is reformulated as the modeling problem of a constrained multibody system. However, for a torpedolike AUV cruising under current disturbances, dynamic modeling and a cruise control analysis have been rarely investigated regarding the desired control response.
Further, coupled nonlinearities using a tether and manipulator to restrain the operation oscillations for underwater vehicles have been analyzed. Jordán et al. [21] analyzed the effects of a cable perturbation on the control system, and determined that an estimation of the force at the attached point on the vehicle can directly compensate for the perturbations and provide greater ROV maneuverability. Bagheri et al. [14] developed an adaptive neural network controller for the four degrees of freedom (DOF) control of an ROV based on the dynamic behavior effects of the communication cable. In consideration of the ocean flow, Mario [22] modeled the tether dynamics in a quasistationary state and presented an adaptive control scheme for tether perturbations. Han et al. [23] proposed an optimal proportionalintegralderivative (PID) merged robust adaptive control for an underwater vehiclemanipulator system (UVMS) with restoring forces and moment compensation. Mohan et al. [24] provided a generalized framework for indirect adaptive control of a UVMS, when considering the dynamic coupling between the vehicle and manipulator. However, the robustness of the controller should be further considered based on the vehicle dynamics under uncertainty and disturbances [25].
Based on a multibody system concept, in the present study, a model was designed based on an adaptive controller. A disturbance model was analyzed, which compensates the dynamics of a finite element tether and multibody underwater vehicle manipulator. The waves and current disturbances were taken into consideration under different surface and underwater conditions. The disturbances from a manipulator on an underwater vehicle were also analyzed with a coupling of the impact and restoring (moment) forces. Two experimental cases, i.e., open frame and streamlined underwater vehicles, were investigated.
The remainder of this paper is organized as follows. Section 2 describes observerbased adaptive dynamic control based on the multibody dynamic model of an underwater vehicle. Disturbance modeling of a vehicle with a tether and manipulator is analyzed in Section 3. The experiments and simulations conducted are discussed and analyzed in Section 4. Finally, Section 5 provides some concluding remarks.
ModelBased Adaptive Dynamic Control
A typical underwater vehicle includes a vehicle carrier, which may be streamlined or open frame. The dynamics of a singular vehicle body can be obtained through the theorem of momentum [26]:
where m represents the mass, and V and F indicate the vector of the velocity of the center of gravity and external forces, respectively. For the underwater vehicle conducting an oceanic operation, a multibody system composed of a flexible neutral buoyancy tether and multiplejoint manipulator was considered. The tether is responsible for communication and energy supply, whereas the multiplelink manipulator should be available for underwater operation. In the multibody construction shown in Figure 1, the flexible nodes include the flexible tether, surface end, and vehicle end of the tether, whereas the rigid nodes include the vehicle and manipulator.
Kinematics of Multibody Nodes of Underwater Vehicle
The coordinates in Figure 1 include the earth coordinates ∑_{a}, O_{ a } − X_{ a }Y_{ a }Z_{ a }, vehicle coordinates ∑_{ v }, O_{ v } − X_{ v }Y_{ v }Z_{ v }, tether coordinates ∑_{ t }, O_{ t } − X_{ t }Y_{ t }Z_{ t }, and ith manipulator link coordinates ∑_{ i }, O_{ i } − X_{ i }Y_{ i }Z_{ i }. Thus, the coordinate transformation from the earth to the vehicle can be expressed as
where c indicates the cosine and s indicates the sine, (x_{v}, y_{v}, z_{v}) is the current position of the vehicle relative to the earth fixed coordinates, and φ, θ, and ψ represent the roll, pitch, and heading angle of the vehicle, respectively.
For the kinematics of an underwater vehicle and rigid multibody system of the manipulator, the angular transformation from the ith link to the (i + 1)th link is
The absolute velocity vector of each node can be obtained through forward propagation from the vehicle to the ith manipulator joint, and the velocity of the ith node of the manipulator can be expressed as
For the kinematics from an underwater vehicle to a multibody tether system, ∑_{ r }, O_{ r } − X_{ r }Y_{ r }Z_{ r } and ∑_{ o }, O_{ o } − X_{ o }Y_{ o }Z_{ o }, are set as the tether vehicle end coordinates, and tether surface end coordinates, respectively. Moreover, in the tether coordinates ∑_{ t }, O_{ t } − X_{ t }Y_{ t }Z_{ t }, x_{ t } is tangential to the tether in the increasing arc length direction, and y_{ t } is on the X_{0}Y_{0} plane. Thus, the relationship between the tether frame and vehicle frame is
where ^{a}R_{v} is the angular relationship between the vehicle and the earth as indicated in the upperleft part of a 3 × 3 matrix of ^{a}T_{v}, \(\alpha\) is the rotation angle of the x_{0} axis into plane X_{ t }Y_{ t } along the z_{0} axis, and \(\beta\) is the angle between planes X_{0}Y_{0} and X_{ t }Y_{ t } after the new x_{0} axis rotates counterclockwise at π/2 to convert the z_{0} axis into the z_{t} axis:
Dynamics and Control of Multibody Underwater Vehicle Nodes
The dynamics of an underwater vehicle can be expressed through the following equation:
where M(q) is the mass, added mass, and inertial matrix of the underwater vehicle, q is the vehicle position vector in the earth fixed coordinate, \({\user2{C}}\left( {{\dot{\user2{q}}}} \right)\) is the centripetal matrix and Coriolis, \({\user2{D}}\left( {{\dot{\user2{q}}}} \right){\dot{\user2{q}}}\) indicates the viscous damping forces, G(q) is the summation of the gravitational and buoyancy forces, \(\user2{\tau}\) denotes the control forces, and τ_{ dis } includes the disturbances from the manipulator and tether on the underwater vehicle. According to the dynamic model of Eq. (3), the designed adaptive dynamic control method can be expressed as
where \(\varvec{S}\,\varvec{ = }\,\varvec{2I}/[(\varvec{I}\, + \,exp(  \varvec{K}_{P} \tilde{q}  \varvec{K}_{d} \tilde{q}))  \varvec{I}]\) is set as the kinematics controller, I = [1 1 1 1 1 1]^{T}, \(\tilde{q}\) = q_{ d } − q is an input error, \({\user2{\dot{\tilde{q}}}}\) is the rate of error change, and K_{ d } and K_{ p } are the derivative and proportional gains, respectively. The sigmoidfunction controller in Figure 2(a) indicates the idea of fuzzy control with control commands loosely considered when the deviation is comparatively large, where the control commands are strictly treated when the deviation is comparatively small [27]. The sliding surface of K_{ s }sgn(S) is further employed to improve the controller robustness under consideration of dynamic uncertainties, and K_{ s } is the matrix of the gains. Therefore, the designed modelbased adaptive dynamic controller not only possesses the same convergence characteristic of a sigmoidfunction kinematics controller, but can compensate for any disturbances according to the dynamic model.
Controller Stability Analysis
Because
a positive definite Lyapunov function is defined as follows:
where ɛ is a positive constant such that ɛ∈(0, λ_{min}{K_{ ρ }}), λ_{min} is the minimum eigenvalue of matrix K_{ p }. Thus, for any nonzero vector U ∈ R^{n}, we obtain
This means that the matrix (K_{ p } − ɛI) is symmetric positive definite. The matrix K_{ d } is symmetric positive definite, and with constant ɛ > 0, we obtain
For the control input vector in Eq. (4) \(\hat{M}({\user2{q}}){\user2{\ddot{q}}}\) is substituted by Eq. (7) for underwater vehicle dynamics:
where \(\hat{M}({\user2{q}})\) is a positive definite matrix. Because \(\hat{M}({\user2{q}})\) is a positive definite matrix, Eq. (7) can be reduced to
where \({\user2{\ddot{\tilde{q}}}} = {\user2{\ddot{q}}}_{d}  {\user2{\ddot{q}}}\) is the acceleration error, and therefore
Using Eq. (5), Eq. (8) can be linearized into Eq. (9) through a certain period of control time:
Furthermore, the Lyapunov function \(V({\tilde{\user2{q}}},{\user2{\dot{\tilde{q}}}})\) is differentiated with respect to time as
Because the matrices K_{ p } − ɛI and K_{d} are symmetric positive definite matrices, \({\dot{\user2{V}}}\left( {{\tilde{\user2{q}}}^{\text{T}} ,{\user2{\dot{\tilde{q}}}}^{\text{T}} } \right)\) in Eq. (10) is globally negative definite. From Lyapunov’s stability theorem, the equilibrium point \(\left[ {\begin{array}{*{20}c} {{\tilde{\user2{q}}}^{\text{T}} } & {{\user2{\dot{\tilde{q}}}}^{\text{T}} } \\ \end{array} } \right]^{\text{T}} = {\user2{0}} \in {\user2{R}}^{2 \times 6}\) is globally uniformly asymptotically stable, i.e.,
Therefore, the control errors converge to zero asymptotically.
Disturbance Analysis and Estimation
Disturbance Analysis for Manipulator
The manipulator disturbance on a vehicle includes the restoring and coupling forces. The restoring forces are caused from changes in gravity and buoyancy center during a manipulation, whereas a coupling force is caused from the coupling motion between the vehicle and manipulator.
The restoring forces can be expressed as
where \({}^{V}{\user2{f}}_{g}^{i}\) and \({}^{V}{\user2{f}}_{B}^{i}\) represent the restoring forces of the ith link; \({}^{V}{\user2{f}}_{g}^{V}\) and \({}^{V}{\user2{f}}_{B}^{V}\) are the restoring forces of an underwater vehicle; \({}^{V}{\user2{r}}_{g}^{V}\) and \({}^{V}{\user2{r}}_{B}^{V}\) are the underwater vehicle gravity and buoyancy center positions vectors, respectively; and \({}^{V}{\user2{r}}_{g}^{i}\) and \({}^{V}{\user2{r}}_{B}^{i}\) are the ith link gravity and buoyancy center position vectors, respectively.
In contrast, the coupling force and moment between the vehicle and manipulator can be backwardly deduced through the following:
Here, ^{i}f_{i,i−1} and ^{i}n_{i,i−1} are the constraint reaction forces from the ith link to the (i − 1)th link, ^{i}r_{ i } = [α_{ i }d_{ i }sα_{ i }d_{ i }cα_{ i }]^{T} is the ith revolt joint vector, ^{i}r_{ ci } = [α_{ ci }d_{ ci }sα_{ i }d_{ ci }cα_{ i }]^{T} represents the geometric center of the ith link, and ^{i}F_{ i,i } and ^{i}M_{ i,i } are the hydraulic force and moment vectors exerted on the ith link, respectively. The hydrodynamic effects include the added mass forces and viscous damping.
Therefore, a manipulator disturbance on a vehicle is a summation of the restoring and coupling forces.
Disturbance from Tether
For a tether and hybrid flexible and rigid multibody system of a vehicle, the applied disturbance forces from the tether exerted on an underwater vehicle can be obtained as the drag forces from the tether. Differing from the analysis in Section 3.1, the dynamics of a flexible tether in a fluid can be deduced through a finite element lumped mass model [28]:
where m_{ t } is the lump mass per unit of length, s is the arc length of the tether, T is the tension force, a is the inertial acceleration, F_{fluid} is the hydrodynamic force per unit of length, ρ_{ w } is the density of sea water, ρ_{ t } is the density of the tether, g is the gravitational acceleration, and A_{ t } is the crosssectional area of the tether.
According to Figure 1, the node construction of a tether includes the surface node, flexible tether, and vehicle end node. For the surface node of a tethered ship end, the drag force T_{0} can be decomposed into H_{0x}, H_{0y}, and V_{0} of the three axes at point O_{0}.
For the ith micro unit length of a tether in the air, if we set ζ_{ i } as the stretched horizontal length of the tether, and ξ_{ i } as the tether height out of the water, we have
where T_{ i } and T_{i+1} are the two tension forces at the two ends of the ith micro unit length, F_{i,wind} is the wind effect force on the ith micro unit length tether in the local frame [x_{ t }, y_{ t }, z_{ t }], C_{wind} is the drag coefficient in the air, v_{wind} is the wind velocity relative to the tether, and for the local wind velocity above the sea surface [29], v_{i,wind} = [v_{10}(d_{1} − ξ_{iw})/10]^{1/7}, and d_{1} is the tether height above the water from O_{0} to the water plane.
Similarly, for the tether in the water,
where T_{ j } and T_{j+1} are the tether tension forces at the two ends of the jth micro unit, F_{j,water} is the current disturbance on the jth micro unit length of the tether in the local frame [x_{ t }, y_{ t }, z_{ t }], and v_{j,rel} is the relative velocity between the water and jth unit tether.
For the ROV end of the tether, the tether tension force T_{ R } at point R can be decomposed into horizontal forces F_{ Rx } and F_{ Ry }, and the vertical force V_{ R }.
Therefore, the tether tension force in the local frame [x_{ t }, y_{ t }, z_{ t }] can be calculated as
where a_{ i } = [a_{ i,Hx } a_{ i,Hy }a_{ i,V }] and a_{ j } = [a_{ jHx } a_{ j,Hy }a_{ j,V }] are the corresponding horizontal and vertical accelerations of the micro units tethered in air and water, respectively. Therefore, a tether induced disturbance at position r_{ t } = [r_{ tx }r_{ ty }r_{ tz }] of the tow point in the ROV end frame is
Simulations and Experiments
Case Study 1, Streamline Underwater Vehicle
An integrated and AUV was applied for cruising experiments (see Figure 3). The cruising, diving, and yawing of the AUV were realized using a propeller, a pair of rudders, and wings. Navigation and position reckoning were realized using a magnetic compass, depth gauge, and Doppler velocity meter (DVL). The vehicle size and inertial and hydrodynamic parameters are illustrated in Tables 1 and 2, respectively.
Cruising experiments in the vertical and horizontal planes were conducted in Songhua Lake of Jilin Province, China. In the experiments on the vertical plane, the desired depths were 3, 15, and 30 m in sequence. The disturbances were obtained using a current sensor. Through control of the horizontal fins, the vehicle was able to follow the desired change in depth accurately using a designed adaptive controller. The desired path during the experiments on the horizontal plane is illustrated in Figure 4(e), the coordinates of the start point are (836, − 194), whereas the coordinates of the end point are (475, − 164). As the experiments indicated, the designed adaptive controller can realize a precise path following a disturbance. Therefore, it can be further applied to the coordinate control of a streamlined vehicle and manipulator.
For the vehicle and manipulator coordinate simulations, the streamlined vehiclemanipulator system was remodeled and equipped with a manipulator model using MATLAB. The system includes a 6DOF streamline underwater vehicle and a 4DOF manipulator. During the simulation, the vehicle was equipped with one main thruster, two side thrusters, and four vertical thrusters for attitude and position control. The parameters of the manipulator are provided in Tables 3 and 4. The rotation angles of the joints are defined as θ_{1}, θ_{2}, θ_{3}, and θ_{4}, from the base joint to the wrist. The manipulation process is controlled through the adaptive controller described in Section 2. The disturbances from the coupling and restoring forces were observed based on the realtime position and attitude of the vehicle and manipulator.
During the simulation shown in Figure 5, the vehicle and manipulator system completed the planned manipulation process. For the first 300 s, the endeffector moved downward from the preliminary position, and it was planned to move upward along the XOZ plane during the second 300 s, and upward along the YOZ plane during the final 300 s. Disturbances including coupling forces and restoring moments were observed and compensated. The manipulator moved smoothly downward along the desired trajectory. The manipulator then moved upward and back. The manipulation process was realized in a precise and successful manner.
Case Study 2, Open Frame Underwater Vehicle
The experimental platform of the open frame underwater vehicle (SYII ROV) is shown in Figure 6. It was equipped with a depth gauge, DVL, and magnetic compass as motion sensors, and six thrusters, including two main thrusters, two lateral thrusters, and two vertical thrusters, as the propulsion system. Data and power were transmitted through a neutrally buoyant tether. The parameters of its tether, hydrodynamics, and inertia are illustrated in Tables 5, 6, and 7, respectively.
The experiments were conducted in a 50 m × 30 m × 10 m tank. Wave and local current generation devices (see Figure 6) were applied to analyze the tether effect. These devices can generate waves and a current from a wave generator to a wave beach with orientations of approximately 300° according to the vehicle’s magnetic compass. To simulate disturbances in a complex oceanic environment, we not only set the current speed to 0.1 m/s, but also generated an irregular Jonswat spectrum wave.
During the position control experiment shown in Figures 7(a)‒(e), the motion states of SYII ROV (u, v, w, p, q, r, φ, θ, and ψ) were measured using a DVL, depth gauge, and magnetic compass. During the control operation, the target position was (0, − 12, 5), and the tetherimmersed part was lengthening along with SYII ROV in advance. The observed disturbance force F_{ Rx } increased until the lateral position was close to − 12 N, when the SYII ROV head was pointing at the target position, i.e., 210°. After the SYII ROV regulated its heading and shifted longitudinally toward the target, the observed disturbance forces F_{ Ry } and V_{ R } increased. The designed adaptive dynamic controller operated better at a reduced longitudinal offset than the controller with a sigmoidfunction owing to a more effective heading control.
Along the 3D path following the experiments shown in Figure 6(e), the tracking errors of the sigmoidfunction controller were unacceptable, whereas the designed adaptive dynamic controller followed the desired path with errors of less than ± 2 m.
To analyze the disturbance from a manipulator, a threefunction and 2 DOF manipulator was equipped on the SYII ROV (see Figure 8), the correlated parameters of which are illustrated in Table 8. When considering the weight and electrical loading capacity, the manipulator had two DOFs in terms of pitch. In the tank experiments shown in Figure 9, the shoulder and elbow joints rolled simultaneously and individually, whereas the SYII ROV maintained its attitude and position using the designed adaptive controller. This type of control is very important for highefficiency hovering manipulation during remote operation or autonomous mode. During the experiments, the angular velocities of the joints were set to 0.35 rad/s. The starting acceleration of each joint was 1 rad/s^{2}. Disturbances from the manipulator revealed that the coupling forces increased suddenly at the joint acceleration moment, whereas the restoring forces maintained a steady state with the manipulator pitching at a uniform speed. The designed modelbased adaptive controller can estimate the disturbances from the manipulator and compensate for them concurrently, whereas the S surface controller compensates the vehicle motion according to the deviations. Therefore, the designed modelbased adaptive controller could obtain steadier and accurate vehicle motions for timevarying disturbances during the experiments.
Conclusions

(1)
A modelbased adaptive controller was designed based on the multibody system of a vehicle, tether, and manipulator. In the dynamic model, the controller can observe and compensate disturbances from the tether and manipulator and thus realize accurate operation control.

(2)
An analysis of the tether disturbance was conducted considering three aspects: the surface section, underwater section, and vehicle end point. The disturbance effects mainly included coupling forces, and the restoring moments from the manipulator to the vehicle were investigated.

(3)
The experiments on an ROV with a tether verified the capability of the controller and observer to achieve accurate cruising, whereas the vehicle and manipulator coordinate motion control used during the simulation and experiments verified the underwater operation of the controller and observer.
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Authors’ contributions
GCZ and HH have carried the project conception and controller design and manuscript writing. JYL and QZ have performed experiments and resposible with data collection. JYX and HDQ participated in experiments and manuscript writing. All authors read and approved the final manuscript.
Authors' Information
Hai Huang born in 1978, is currently an associate professor at National Key Laboratory of Science and Technology on Autonomous Underwater Vehicle, Harbin Engineering University, China. He received his PhD degree on mechatronics from Harbin Institute of Technology, China, in 2008. His research interests include underwater vehicle and intelligent robotics.
GuoCheng Zhang born in 1983, is currently a lecture at National Key Laboratory of Science and Technology on Autonomous Underwater Vehicle, Harbin Engineering University, China. He received his PhD degree on naval architecture and marine engineering from Harbin Engineering University, China, in 2013. His research interests include underwater vehicle.
JiYong Li born in 1992, is currently a PhD candidate at National Key Laboratory of Science and Technology on Autonomous Underwater Vehicle, Harbin Engineering University, China.
Qiang Zhang born in 1981, is currently a lecture at National Key Laboratory of Science and Technology on Autonomous Underwater Vehicle, Harbin Engineering University, China. His research interests include underwater vehicle.
JinYu Xu born in 1993, is currently a Master candidate at National Key Laboratory of Science and Technology on Autonomous Underwater Vehicle, Harbin Engineering University, China.
HongDe Qin born in 1976, is currently a professor and a PhD supervisor at National Key Laboratory of Science and Technology on Autonomous Underwater Vehicle, Harbin Engineering University, China. His research interests include underwater vehicle and intelligent robotics.
Acknowledgements
Supported by National Natural Science Foundation of China (Grant Nos. 5129050, 51579053, 61633009), Major National Science and Technology Project of China (Grant No. 2015ZX01041101), and Key Basic Research Project of “Shanghai Science and Technology Innovation Plan” of China (Grant No. 15JC1403300).
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Experimental video of AUV.
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Huang, H., Zhang, G., Li, J. et al. Model Based Adaptive Control and Disturbance Compensation for Underwater Vehicles. Chin. J. Mech. Eng. 31, 19 (2018). https://doi.org/10.1186/s1003301802185
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Keywords
 Underwater vehicle
 Adaptive control
 Disturbance observer
 Multibody dynamic model