MSC ADAMS Software Research Articles

Stability improvement of a dynamic walking system via reversible switching surfaces

Inspired by the effects of a switching surface on the stability of passive dynamic walking (Safa and Naraghi in Robotica 33(01):195–207, 2015; Safa et al. in Nonlinear Dyn. 81(4):2127–2140, 2015), this paper suggests a new control strategy for stabilization of dynamic bipedal locomotion. It verifies that the stability improvement of a dynamic walking system is feasible while preserving the speed, step-length, period, natural dynamics, and the energy effectiveness of the gait. The proposed control policy goes behind the three primary principles: (i) The system’s switching surface has to be replaced by a new one if an external disturbance is induced. (ii) The new switching surface has to be reshaped back into its old style, together with the disturbance rejection. (iii) The stabilization procedure has to be performed with as small energy consumption as possible. Because of the reversibility effects of the switching surfaces in the above rules, the terminology of “Reversible Switching Surfaces” (RSS) is employed to address the control scheme; so the control objective would be the implementation of RSS for a bipedal robotic system. In this paper, this aim is achieved by a kinematically controlled foot scheme that is implemented on a simple structured biped. The presented idea is validated by a commercial version of MSC Adams software.

Kinematic and Dynamic Analysis and Distribution of Stress in Items of Planar Mechanisms by Means of the MSC ADAMS Software

This paper presents a kinematic and dynamic analysis and distribution of the stress in items of a planar mechanism by means of the MSC ADAMS software. Graphic dependence of kinematic and dynamic magnitudes of some points is given in dependence on the angle of rotation of the driving item and in dependence on the time. Distribution of the stress in the items presented is in [Pa]. In relation to the kinematic and dynamic analysis and subsequent simulation [1-3] of the planar as well as spatial mechanisms, it is great solution to use MSC Adams software program. The considerable advantage of this mentioned program is based on its simplicity from the aspect of modelling and moreover, it is important to point out that utilisation of the mentioned program leads to results which are precise and accurate in the case of the numerical solution of the equations in the whole magnitude referring to motion of mechanism while the given results are obtained in the graphic form.

Kinematic and Dynamic Analysis and Distribution of Stress in Items of Planar Mechanisms by Means of the MSC ADAMS Software

This paper presents a kinematic and dynamic analysis and distribution of the stress in items of a planar mechanism by means of the MSC ADAMS software. Graphic dependence of kinematic and dynamic magnitudes of some points is given in dependence on the angle of rotation of the driving item and in dependence on the time. Distribution of the stress in the items presented is in [Pa]. In relation to the kinematic and dynamic analysis and subsequent simulation [1-3] of the planar as well as spatial mechanisms, it is great solution to use MSC Adams software program. The considerable advantage of this mentioned program is based on its simplicity from the aspect of modelling and moreover, it is important to point out that utilisation of the mentioned program leads to results which are precise and accurate in the case of the numerical solution of the equations in the whole magnitude referring to motion of mechanism while the given results are obtained in the graphic form.

SURVEY OF REMOTELY CONTROLLED LABORATORIES FOR RESEARCH AND EDUCATION

The article presents the modeling and simulation of the crank-piston model of internal combustion engine. The object of the research was the engine of the vehicle from the B segment. The individual elements of the gasoline engine were digitizing using the process of reverse engineering. After converting the geometry, assembling was imported to MSC Adams software. The crank-piston system was specified by boundary conditions of piston forces applied on the pistons crowns. This force was obtain from the cylinder pressure recorded during the tests, that were carried out on a chassis dynamometer. The simulation studies allowed t determine the load distribution in a dynamic state for the selected kinematic pairs.

CRANK-PISTON MODEL OF INTERNAL COMBUSTION ENGINE USING CAD/CAM/CAE IN THE MSC ADAMS

The article presents the modeling and simulation of the crank-piston model of internal combustion engine. The object of the research was the engine of the vehicle from the B segment. The individual elements of the gasoline engine were digitizing using the process of reverse engineering. After converting the geometry, assembling was imported to MSC Adams software. The crank-piston system was specified by boundary conditions of piston forces applied on the pistons crowns. This force was obtain from the cylinder pressure recorded during the tests, that were carried out on a chassis dynamometer. The simulation studies allowed t determine the load distribution in a dynamic state for the selected kinematic pairs.

Optimizing the geometry of the connecting rod in opposite pistons engine

The article presents the results of simulations research carried out, using Finite Element Method. The simulations were made in the Abaqus software. Studies were related to the reduction and improving of stress distribution in the connecting rod of opposite pistons combustion engine. The connecting rod has been developed in a 3D environment in the Catia software, then imported into the simulation tool, in which stress tests were performed. The connecting rod was subjected to a compression and stretching tests. Boundary conditions of forces used in simulation tests have been developed on the basis of the dynamic model created in the MSC Adams software. The study included nine iterations of geometric changes of connecting rod. Shape as well as properties such as parametric dimensions (rod length) were changed. The changes were dictated by the reduction of the maximum values of the stresses and the size of the fields with large stress values. As a result of the simulations, the improvement of the connecting rod strength was obtained by its geometrical change (which was obtained by reducing the stress fields).

Dynamical Analysis of 3D Printer's Powertrain

The current situation on a 3D print field is increasing precision of printers and printing of small parts. We have decided to use reverse philosophy and build 3D printer of big dimensions. This resulted in need of performing a dynamical simulation. The goal of this paper is to perform a dynamical analysis of moving parts of 3D printer and also to find suitable type of powertrain motors. The dynamical analysis will be performed by MSC Adams software, according to “user-friendly interface”.

Analysis of reaction forces in human ankle joint during gait

The paper aims to analyze the human ankle joint reaction forces with a multibody system approach, using MSC Adams software and its features. The paper presents the results provided by the simulation of a spatial mechanical structure, which replicates the human’s locomotion system in terms of bone structure. The mechanical structure used for determining the human ankle joint reaction forces consists of 7 kinematic elements linked by 6 spherical joints constrained to 1 DOF each.

UNCONVENTIONAL MATERIAL PART FEM ANALYSIS

The article covers the usability of alternative materials in vehicle construction. The paper elaborates upon the setup of the process and analysis of the results of the carbon composite component FEM model. The 3D model, used for the examination, is a part of axle from an alternative small electric vehicle. The analysis was conducted with the help of MSC Adams and Ansys Workbench software. Color maps of von Mises stress in material and total deformations of the component are the results of calculation.

Kinematical Analysis of Crank Slider Mechanism with Graphical Method and by Computer Simulation

The thesis focuses on kinematics analysis of a six-member planar mechanism using the MSC Adams software. The aim of the thesis is to create a model of a crank mechanism with rocking lever in the MSC Adams software and to perform a kinematics analysis on it. The first chapter is dedicated to mechanism theory. The second chapter contains theoretical basis for the issue of simultaneous movements and information about selected kinematics quantities. The next chapter contains a brief description of the solved mechanism. Next, graphic solution of the selected mechanism is performed for result comparison. The next chapter briefly describes the basic workspace of the MSC Adams and lists the process of modeling the selected mechanism. The results of the solutions are numerical values and graphs of selected kinematics quantities depicted in tables and graphically. Data acquired from the graphic solution and from computer modeling are compared and evaluated.

Development of a simulation model of semi-active suspension for monorail

The new Kuala Lumpur Monorail Fleet Expansion Project (KLMFEP) uses semiactive technology in its suspension system. It is recognized that the suspension system influences the ride quality. Thus, among the way to further improve the ride quality is by fine- tuning the semi-active suspension system on the new KL Monorail. The semi-active suspension for the monorail specifically in terms of improving ride quality could be exploited further. Hence a simulation model which will act as a platform to test the design of a complete suspension system particularly to investigate the ride comfort performance is required. MSC Adams software was considered as the tool to develop the simulation platform, where all parameters and data are represented by mathematical equations; whereas the new KL Monorail being the reference model. In the simulation, the model went through step disturbance on the guideway for stability and ride comfort analysis. The model has shown positive results where the monorail is in stable condition as an outcome from stability analysis. The model also scores a Rating 1 classification in ISO 2631 Ride Comfort performance which is very comfortable as an overall outcome from ride comfort analysis. The model is also adjustable, flexibile and understandable by the engineers within the field for the purpose of further development.

Scotch-Yoke mechanism for a syringe pump - A case study

Syringe Pump is mainly used in microfluidics, where precise flow rate is required. Precise flow rate is achieved by using minimum torque and at low speed, for such requirements a mechanism has to be constructed. The input is from a stepper motor, so a rotary to linear motion converting mechanism is required, which will work efficiently on such low torque applications. This work mainly looks into feasibility of scotch yoke rather than conventionally used crank and slider mechanism. Scotch yoke is a rotary to linear conversion mechanism. It contains mainly two parts i) a rolling scotch and ii) a sliding yoke. The yoke is driven by a pin eccentrically placed on the scotch. Since proximity of the mechanism is nearer to the source, the loss accounted is less in the case of scotch yoke. In this work both crank-slider and scotch-yoke are examined through simulation using MSC ADAMS software and the maximum velocity of that can be achieved is obtained analytically through Kinematic analysis of scotch-yoke mechanism.

Numerical investigation of a flexible slider–crank mechanism with multijoints with clearance

This paper aims to study the dynamic behavior of a slider–crank mechanism with flexible components and a multijoint clearance. A numerical investigation was developed for this objective. The mechanism model used for the simulation tests has been performed under MSC ADAMS software using the contact force under the “Impact-function” library. The obtained results illustrate that the mechanism performance is more significantly influenced with multiple joints with clearance. Three contact modes are involved: (i) a continuous contact motion, (ii) a free motion, and (iii) an impact motion. Numerical outcomes prove that the clearance dimension and location have a determinant effect on the slider responses precision. The mechanism reliability decay and a random overall behavior govern the dynamic response along the free flight mode.

APPLICATION OF MSC ADAMS – NX NASTRAN/FEMAP INTERFACE IN STRENGTH CALCULATIONS OF TRUCK FRAMES

Summary. In this paper, the finite element method (FEM) is used to calculate the strength of truck frames by integrating the MSC Adams software, for dynamics analysis of mechanical systems, and the NX Nastran/Femap software. At the same time, a method for reducing degrees of freedom is been developed based on the Craig–Bampton method. The interface is applied in order to calculate the strength of the frame in the selected truck, which runs on the test track. The selected model of truck can be treated as the virtual prototype that is useful in the design process.

Dynamic Simulation and Optimization of Rhombic Drive Stirling Engine Using MSC ADAMS Software

In this work, a Beta type Stirling engine with rhombic drive is simulated and optimized using MSC ADAMS software to enhance engine performance. Schmidt model is adopted to determine the instantaneous gas pressure. Hence, the exerted forces on the power piston can be calculated. The model is designed with low to moderate temperature difference in order to facilitate the use of low cost evacuated tubes solar collector. This is in contrast to the use of high cost double axes tracking parabolic dish concentrator that results high temperature difference. All gas forces, friction forces at joints, masses and inertias as well as temperatures of expansion and compression chambers were considered in the model. Simulation at different external loads are carried out and Power-Speed curves for the engine are obtained. The performance optimization based on the dynamic model obtained from the software is formulated. The dimensions of all rhomboid mechanism links, diameters of displacer and piston, and the length of displacer are set as the design variables. The masses and the inertias of the links are set as function of their lengths to account for the variation of the links’ dimensions during optimization. The mass of the working gas is kept constant to maintain the input energy at certain value. Results showed that a great increase in the output power could be achieved by optimizing the geometrical parameter of the engine drive.

MULTI-BODY SIMULATIONS OF RAILWAY WAGON DYNAMICS

The main aim of the presented paper is to verify the dynamics of chosen railway wagon using multi-body methods. Thus, in tests a wagon prototype with rotational rail-car body was simulated, which is going to be used for TIR vehicles trailer bodies transporting. Implemented prototype is authored by the team from Department of Applied Mechanics and Computer Science from Faculty of Mechanical Engineering in Military University of Technology. For this purpose CAD model, and subsequently numerical model, of mentioned wagon was developed. Using MSC Adams software initial boundary conditions, material parameters and contact characteristics were defined. In the previous authors’ paper [1], preliminary analyses of the loads acting on the railway platform were carried out, which verified chosen parameters and coefficients. The main aim of presently proposed 3D multi-body simulations of railway wagon is to investigate its motion with full load and to determine the operation limit safety. Thus, in the performed analyses the railway wagon was accelerated to the desired velocity and drove through the curved tracks with four different velocities. From the carried out simulations the wagon dynamic behaviour was investigated and obtained results including contact forces characteristics were compared from all analyses cases. Moreover, performed study shows that the MSC. Adams software is capable for analysing and simultaneously validating various complex engineering problems, such as the one investigated by the authors

Multi-body Model Validation of a Landing Gear System for a General Aviation Aircraft

The present work is aimed to numerically validate the experimental drop test results, related to the landing gear of a general aviation aircraft, in order to define an appropriate simulation methodology able to save time, costs and risks due to structural design and experimental test campaign required in the certification phase. The aircraft selected for this research activity is the AP-68TP-300 Spartacus, an Italian nine-seat, twin-engined, high wing monoplane, realized by Vulcanair S.p.a.. The multi-body approach has been developed through the MSC Adams software, starting from a simplified 1D model up to a more detailed 3D one. The comparison between numerical and experimental results in terms of load factors has been carried out in accordance with CS-23 (Certification Specifications for Normal, Utility, Aerobatic and Commuter Aeroplanes), and it has shown a good correlation, especially for the 3D model, since it better fits the real behaviour of the entire system. Keywords: Landing Gear, Drop Test, Multi-body Systems, MSC Adams.

Modeling and Controller Comparison for Quarter Car Suspension System by Using PID and Type-1 Fuzzy Logic

Ensuring vehicle drive comfort and securing drive safety are the leading topics among the most interested issues for researchers in vehicle dynamics area. In this paper, a method utilizing a linear actuator is proposed for active control of the vehicle vibrations which are caused by road profile, intending to improve drive comfort and safety of road vehicles. The mathematical model belonging to the system that is evaluated as two degrees of freedom quarter car suspension system is derived by using Lagrange Equation of Motion and MATLAB/Simulink software. In addition to modeling technique, dynamic model of proposed system is created in MSC-ADAMS software and it is simulated in both Matlab and Adams programs together. Moreover two different controllers are designed, which are PID and Artificial Neural Network Based Fuzzy Logic (ANNFL) control in order to use in active vibration control simulations. Performances of the designed controllers are examined and the suitability of the designed controllers is studied by comparing their performances in case of using two different road profile functions.

Determining the Driving Torques of the Robots with Delta 3DOF Parallel Structure by Using the MSC ADAMS Software Pack

During the latest years the parallel structure robots have been used more and more due to their advantages that consist of: high stiffness, availability for usage at higher speed and acceleration rates. In general these robots are used for handling light objects [. For choosing the driving servomotors of the robots, the maximum torques needed for the parallel mechanism to transport an object of a certain weight, along a trajectory, at a certain speed and acceleration, have to be considered. In this work the authors are approaching the study of the variation of the driving torques of the robots with parallel structure Delta 3DOF along a trajectory, in order to select the driving servomotors [2]. For analyzing the driving torque variations along a trajectory the MSC Adams software pack has been used.

Design Considerations Regarding a New Knee Orthosis

Orthoses are common devices to correct or prevent gait abnormalities in children. In this paper we present a new design for knee orthoses with a modular structure used for childrens locomotion recovery through kinetotherapeutic procedures, after some bone fractures or surgical interventions at the lower limb level. This research consists of an experimental analysis on children walking, a complete human lower limb dynamic analysis, modeling and simulation of a new knee orthosis. A new modular knee orthosis validated by analytical results and computer simulation using MSC Adams software was developed and is presented here.