Dynamic Analysis Of Mechanical Systems Research Articles

Application of Virtual Prototyping Technology in the Design of Drive Axle

In this paper, a virtual prototype model of the nonlinear vibration system is built by using the ADAMS(Automatic Dynamic Analysis of Mechanical Systems), and the simulation process of the hydro-pneumatic suspension is presented. A simulation analysis of the drive axle is done with road unevenness. The result shows that it is more important to consider the nonlinear damping than the nonlinear stiffness in the analysis of a nonlinear structure with a random response sometimes.

ADAMS-Based Vibrating Subsoiler System Simulation Analysis

For the vibrating subsoiler, considering the material acting force, the system is simplified as a single degree of freedom weight-spring-damp model which will simulate the vibrating subsoiler system based on Automatic Dynamic Analysis of Mechanical System (ADAMS). The analysis result shows that the vibrating subsoiler can not perform well under conditions of high vibration frequency and advance speed.

ADAMS-Based Dynamic Simulation on Driving Axle Gear Meshing

In the transmission system of drive axle, the gears' transmission performance of final drive and differential is the key to transmission system. Based on Automatic Dynamic Analysis of Mechanical System (ADAMS), the virtual gear meshing prototype of final drive and differential were established. Based on the Hertz elasticity impact theory, the contact forces between gears were built. The real-time dynamic simulation of gear meshing was achieved. The gears’ transmission of final drive and differential in drive axle was simulated under limit conditions by imposing different torque in driving gear of final drive and differential gears. The curves of meshing force and angular speed of differential gears and driving gears of final drive are obtained. The theoretical reference is provided to the study of the dynamic characteristics in gear transmission system.

Processing of Lapping Track in Dual Rotated Plates Eccentric Lapping Mode

Dual Rotated Plates (DRP) eccentric lapping mode is developed on the base of traditional eccentric lapping mode for precise balls. Spin angle is an important target of expressing ball rotation in the lapping process. Whether lapping track can uniformly cover the ball surface or not is directly determined by the variation of the spin angle. Applying virtual prototype technology and ADAMS (Automatic Dynamic Analysis of Mechanical Systems) to simulate the ceramic ball lapping track in DRP eccentric lapping mode. And these results are compared to traditional one. At the same condition, the DRP eccentric lapping mode owns better lapping uniformity than traditional one and it is easy to apply to science for the simplicity of structure and control. The result may offer theoretical basis for high-precision ceramic balls machining.

Application of ADAMS in Course Teaching of Mechanism

Automatic Dynamic Analysis of Mechanical System (ADAMS) provides a powerful modeling and simulating environment that helps people to build, simulate, refine, and ultimately optimize any mechanical system. In the classroom teaching of mechanism course, to use ADAMS to show the establishment and movement of all kinds of mechanisms and their simulation process of kinematics and kinetics as a demonstration will significantly enrich students' perceptual knowledge, enlighten and guide students cogitation, stimulate their interests in mechanism thereby enhance the effectiveness of course teaching.

Virtual Prototype Modeling and Simulation of Pipe Wagon Articulating System

Virtual prototype of pipe wagon articulating (PWA) system has been developed and simulated based on the kinematics and dynamics of machinery and Automatic Dynamic Analysis of Mechanical Systems (ADAMS) software. It has been integrated with real-time three dimensional (3-D) system simulations for detailed and responsive interaction with dynamic virtual environments. By using this virtual model, the conceptual design examination and performance analysis of the PWA system have been realized dynamically in virtual laboratory. System dynamic force, displacement and tension of pipe have been measured through verifying this 3- D virtual prototype. By comparing the static tension and dynamic tension of pipe, the difference between the two kind tensions has been found. The simulated dynamic tension is much greater than the static tension obtained from the static theory. The results attained in this work suggest that the conceptual designed PWA system can meet the requirements of the operation.

A Hybrid Approach for the Random Dynamics of Uncertain Systems under Stochastic Loading

This paper presents a hybrid Galerkin/perturbation approach based on Radial Basis Functions for the dynamic analysis of mechanical systems affected by randomness both in their parameters and loads. In specialized literature various procedures are nowadays available to evaluate the response statistics of such systems, but sometimes a choice has to be made between simpler methods (that could provide unreliable solutions) and more complex methods (where accurate solutions are provided by means of a heavy computational effort). The proposed method combines a Radial Basis Functions (RBF) based Galerkin method with a perturbation approach for the approximation of the system response. In order to keep the number of differential equations to be solved as low as possible, a Karhunen‐Loève (KL) expansion for the excitation is used. As case study a non‐linear single degree of freedom (SDOF) system with random parameters subjected to a stochastic windtype load is analyzed and discussed in detail; obtained numerical solutions are compared with the results given by Monte Carlo Simulation (MCS) to provide a validation of the proposed approach. The proposed method could be a valid alternative to the classical procedures as it is able to provide satisfactory approximations of the system response.

Robust Adaptive Stabilization of Skid Steer Wheeled Mobile Robots Considering Slipping Effects

This paper represents the posture stabilization of a skid steer wheeled mobile robot (SSWMR). Although in mobile robots lateral skidding of the wheels occurs when turning at high speed, wheels of a SSWMR laterally skid in every rotational maneuver even at low speeds. Also, longitudinal slipping for wheeled mobile robots with pneumatic tires is inevitable due to tire deformation. In order to compensate for the effects of tire slippage and parameter uncertainties, an adaptive torque controller is developed based on a tunable dynamic oscillator. The globally uniformly ultimately bounded stability of the system to an arbitrarily small neighborhood of the origin is proved. The internal dynamics stability of the system is guaranteed employing a supervisory fuzzy logic-based controller. To demonstrate the performance of the proposed controller, modeling of a SSWMR was implemented through automatic dynamic analysis of mechanical systems (ADAMS).

Design and Analysis of Folding Linkage Based on Five Functional Medical Bed

Based on the simplex style of the traditional medical beds at home and abroad presently, a new folding mechanism of multifunctional medical bed was presented. After theoretical analysis, an optimal structure was selected. This mechanism consists of several planar four-bar linkages. It has one degree of freedom, which means it can be driven by only one driving torque to achieve multi-states changes. Therefore, it could save the space and reduce the weight of the bed as much as possible. The analysis of mechanism was carried out, simulation and stability were performed as well. A proto was established in the software named Automatic Dynamic Analysis of Mechanical Systems (ADAMS) to verify feasibility of the mechanism and the correctness of the design principle. It is an ingenious and brief design, which provides useful information for future research about folding medical bed.

Kinematics Analysis of a New 5 DOF Parallel-Serial Machine Tool Based on the Vector Method

A 5-axis parallel-serial machine tool is proposed, which consists of a 3-DOF parallel mechanism and a 2-DOF serial mechanism, and the kinematics analysis is discussed in detail based on the vector method. The size of the velocity transformation matrix is decreased. The problem of parameter coupling is resolved by adopting identity matrix and four-element vector. The relationship between the velocity and acceleration of the movable platform and the input parameters of the parallel mechanism is established. These algorithms are verified correct through ADAMS (Automatic Dynamic Analysis of Mechanical System) and can be referenced by kinematics analysis, dynamics analysis of parallel or parallel-serial machine tools, which have coupling kinematics parameters.

Simulation and Analysis for Spin Angle Track of the Ball Machined by Dual Rotation Plates Lapping Method

Spin angle is an important target of expressing ball rotation in the lapping process. Whether lapping track can uniformly cover the ball surface or not is directly determined by the variation of the angle. The simulation of spin angle track of the ball based on ADAMS (Automatic Dynamic Analysis of Mechanical Systems) with Dual Rotation Plates Lapping Method by applying virtual prototype technology and using ADAMS is given by the article. The track based on ADAMS is similar with the track of using mathematical theory on the whole. The simulation results show that DRP lapping method owns better lapping uniformity and it is easy to apply to science for the simplicity of structure and control. The spherical lapping uniformity will be further studied with ADAMS in a convenient way.

A Penalty Formulation for Dynamics Analysis of Redundant Mechanical Systems

Redundancy in the constraining of mechanical systems achieves more stability and larger load capacity for the system, while in actuation it provides better robustness against singularities and higher maneuverability. Few techniques have been developed with the aim to handle redundancy and singularities in dynamics analysis, and further research is still needed in this area. In this paper, we illustrate the concept of actuating and passive constraints. Then, we expand on the existing penalty techniques by incorporating the concept of actuating and passive constraints to present a penalty formulation that is capable of efficiently handling singularities and redundancy in constraining and actuation and can carry out either forward or inverse dynamics analysis of mechanical systems. As such, the proposed approach is referred to as the actuating-passive constraints penalty approach.

Analogue neuronal network in a biomorphic machine: modelling and simulation in ADAMs

This paper presents a study of the adaptive navigation behaviour in a five-degree-of-freedom biomorphic machine driven by an analogue neuronal network. The analogue neuron is introduced and its mathematical model derived. The biomorph, Quadrupedal Uncontrolled Locomotion (QUL 1.4), is fabricated for study. The analogue neuron ring controller and mechanics are described. A computer model is created in Automatic Dynamic Analysis of Mechanical Systems (ADAMs) software and successful forward gaits in simulations match the observed results. Obstacle climbing over a cylindrical object is simulated and results are shown. The final part of the paper deals with three levels of coupling within QUL 1.4. A distance modulation approach is introduced as a simple method of identifying lever points in biomorphic machines.

Dynamic simulation of auto-centralizer for horizontal well traction robot based on ADAMS

Abstract Traction robot conveying technology is efficient in horizontal well logging. Auto-centralizer is an assistant support to bear the weight of robot and center the robot in casing while logging. The mechanical model for an auto-centralizer with four pair of bias arms was built based on spring-lever mechanism. ADAMS (Automatic Dynamic Analysis of Mechanical Systems) was applied to analyze the sensitiveness coefficient of structural parameters and spring force, thus optimizing the structural parameters. Consequently, a simulation model was built based on the optimization result, and a simulation study was carried out on the mechanical properties and dynamic performance with the ADAMS mechanics system modeling and simulation module. The results implied that the original structure had a disadvantage while traversing obstacles. Further studies indicated that the coupling between the pair arms adopted hinge joint, which couldn't form a closed triangle of force while traversing obstacles. We have employed an improved structure by adding a connecting lever to eliminate the constraint between the arms. Contrast experiments show that the new structure avoids bearing the load with one side and has less shock while traversing obstacles, thus improving smoothness of movement for the traction robot.

Characteristics Analysis and Simulation of Permanent Magnet Actuator With a New Control Method for Air Circuit Breaker

In this paper, a new method is proposed to control the permanent magnet actuator (PMA) of air circuit breaker (ACB). The characteristics such as magnetic field, making and breaking processes are analyzed using finite-element method. The inductance and permanent magnetic parameters are computed in advance for subsequent incorporation into a cosimulation system. The simulation model is setup in Matlab and data are shared with the automatic dynamic analysis of mechanical systems (ADAMS) software. The making and breaking processes are integrated into a simulation system to allow simple observation of the simulation procedure. Experiments are carried out on an ACB prototype to verify the proposed control method.

From Newtonian dynamics to sparse Tableaux formulation and multi-body dynamics

This paper discusses the importance of the classical Newtonian mechanics on a new computer-oriented formulation called Sparse Tableaux Formulation (STF), which is the heart of Automatic Dynamic Analysis of Mechanical Systems. At the same time, it shows that such formulation can integrate different methods of numerical integration without disturbing its integrity. The STF is a modularized formulation as well as being open-ended. This will allow its development in time according to scientific and industrial demand. The paper shows that the physical systems can be mapped into mathematical representations that can be assembled in harmony with the system's structure, and the results of the computer simulations can be mapped back directly into the physical system.

Preliminary simulation of the GAP mechanical system for oil sands haulage

Kinematic synthesis and dynamic simulation of the Ground Articulating Pipeline (GAP) system has been carried out with Automatic Dynamic Analysis of Mechanical Systems (ADAMS) software. A kinematics model of the GAP mechanism has been built based on the kinematics of machinery. The equations of Newton-Euler dynamics were employed as the computational framework for the dynamic simulation of the system. A virtual prototype has been created and simulated in the ADAMS environment. The simulation has been integrated with real time 3-D system for detailed and responsive interactions with dynamic virtual environments. The results of the kinematics synthesis showed that the GAP system consists of 14 pipe arms and seven master carriages to accommodate a shovel advance of 400 m per week. The results of the dynamic simulation showed that the GAP system meets the operating requirement of each slave master displacement of 60 m with good operating characteristics.

Developing a virtual prototype of a rack and pinion steering system

The operation of an automobile steering gear is intermittent with low angular velocities and frequent direction reversals. For a typical Rack and Pinion Steering (RPS) gear used in light vehicles, the span of movement of the rack is limited to approximately four rotations of the pinion. For this limited span of rack travel, the torque required to rotate the pinion is tested for satisfactory functioning of the steering gear. The torque variation due to engagement and disengagement of the pinion teeth, mesh friction variation, and spring force that keeps the gears in mesh, etc., are obtained from the virtual prototype developed in Automatic Dynamic Analysis of Mechanical Systems (ADAMS) software, where, the manufacturing errors are also incorporated. Comparisons of the results from the virtual prototype with those from laboratory tests validate the correctness of the proposed prototype in ADAMS. This prototype lends itself for the implementation of improvement concepts and performance testing.

TMPT tire modeling in ADAMS

Because accurate modeling of the tire-road interaction forces forms the basis for virtual prototyping analysis in the field of vehicle dynamics, tire modeling has always been a key item of the Automatic Dynamic Analysis of Mechanical Systems (ADAMS) product line. This paper briefly explains the current ADAMS offering in tire modeling and the approach taken for the TMPT benchmark program. When the TMPT benchmark program is considered as a test case for vehicle dynamics tire models, ADAMS has proved to have adequate functionality in the tire/road interface and to provide the user with a wide range of tire models to pass this test successfully.

Modeling and simulating for TSHD’s swell compensator by ADAMS

CHC Trailing suction hopper dredgers (TSHD) have been widely used in dredging industry. In order to simulate the dredging process accurately, a mathematical model for a swell compensator used in TSHD is proposed, and a friendly simulation model based on the Automated Dynamic Analysis of Mechanical Systems (ADAMS) is built to test and validate the mathematical model for the swell compensator. The factors influencing the dynamic behavior of the TSHD suction pipe system, such as the motion of the vessel in an unquiet situation with different water current velocities, seabed profiles, seabed soil hardness and the forces acting on the suction pipe system, have been taken into consideration. The simulation results show that they fit in with the operating practice qualitatively.