A Computational Environment for Dextrous Workspace Analysis

1992 ◽  
Author(s):  
J. Y. Wang ◽  
J. K. Wu
Keyword(s):  
Mechanical System ◽  
Automatic Differentiation ◽  
System Modeling ◽  
Necessary Condition ◽  
Dimensional Solution ◽  
Computational Environment ◽  
Kinematic Behavior ◽  
Workspace Analysis ◽  
Engineering Environment ◽  
System Configurations

Abstract This paper presents an interactive engineering environment for dextrous workspace analysis of manipulators. The environment contains a mechanical system modeling tool, an automatic differentiation package, and numerical solvers that map one-dimensional and two-dimensional solution sets of nonlinear parametrized kinematic constraint equations. Row-rank deficiency of constraint sub-Jacobian matrices is used as a necessary condition for characterizing the boundaries of the workspaces and dextrous workspaces of manipulators. A cursor driven animation capability, developed in an interactive graphics environment allows the user to retrieve system configurations by dragging the cursor along solution branches. An animation of the assembled configuration along that solution branch is then displayed. Thus, a better understanding of the kinematic behavior of mechanical systems that limits their dexterity can be obtained. A construction backhoe mechanical system is used to demonstrate the capability of the method developed.

scholarly journals Passing through resonance of the unbalanced rotor with self-balancing device

2021 ◽  
Author(s):  
Olga Drozdetskaya ◽  
Alexander Fidlin
Keyword(s):  
Mechanical System ◽  
Stationary System ◽  
Slow Dynamics ◽  
Averaging Technique ◽  
Unbalanced Rotor ◽  
Different Types ◽  
Limited Power ◽  
Damped Systems ◽  
System Configurations ◽  
Strongly Damped

AbstractThe slow dynamics of unbalanced rotors with a passive self-balancing system are investigated considering the interaction of the mechanical system with a limited power engine. The slow dynamics equations are obtained using the averaging technique for partially strongly damped systems. Stationary system configurations, different types of nonstationary solutions while passing through resonance, and areas of stability and attraction are investigated.

Mechanical System Information Management in a Shared Multidisciplinary Environment

1994 ◽  
Author(s):  
J. K. Wu ◽  
X. Yang ◽  
X. Li ◽  
D. A. Kvidera
Keyword(s):  
Data Management ◽  
Mechanical System ◽  
Information Model ◽  
Global Database ◽  
Cad System ◽  
History Of ◽  
Engineering Environment ◽  
Management Method ◽  
System Information ◽  
Product Definition

Abstract This paper describes the information model and data management methods developed for the global database of a Concurrent Engineering environment for mechanical system design and evaluation. The environment considered has a CAD system and four CAE applications. The information model supports these engineering disciplines through multiple, unrestricted product composition hierarchies and a shared product definition. The dependency between the shared product definition and application models and between attributes of the parameterized, shared product definition are analyzed. The data management method employs a versioning policy that maintains consistent representations and history of the design as it undergoes design change transactions.

A Logic-Based Mechanical System Constraint Model

1993 ◽  
Author(s):  
J. K. Wu ◽  
J. H. Wang ◽  
C. X. Feng ◽  
T. H. Liu
Keyword(s):  
Mechanical System ◽  
Predicate Logic ◽  
System Level ◽  
Design Constraint ◽  
Design Constraints ◽  
Design Changes ◽  
Engineering Environment ◽  
Feature Fitting ◽  
Constraint Modeling ◽  
Constraint Model

Abstract This paper presents some initial developments in modeling design constraints of mechanical systems using predicate logic. This design constraint modeling method is to manage design changes in a concurrent engineering environment that has CAE and CAM applications. The design constraints are classified according to an object hierarchy of a mechanical system information model which has five levels object including: a mechanical system level, assembly level, and part level. The constraint relationships are defined and formally expressed using predicate logic. Feature fitting and against relationships between parts in the assembly level and relationships between features of a part in the part level have been illustrated in the paper.

Analysis and Optimization of the Piston System Using CAD/CAE Engineering Environment

2015 ◽  
Vol 809-810 ◽  
pp. 1127-1132 ◽  
Author(s):  
Aleksander Gwiazda ◽  
Krzysztof Foit ◽  
Wacław Banaś ◽  
Agnieszka Sękala ◽  
Zbigniew Monica
Keyword(s):  
Complex System ◽  
Stress Distribution ◽  
Mechanical System ◽  
Piston Engine ◽  
Piston System ◽  
Engineering Environment

This article presents the approach to the problem considered with optimizing the stress distribution and functioning of a crankshaft system of a piston engine. One of possible methods of investigating such a problem is simulation of work of the analyzed mechanical system. This approach allows observing the work of a modeled system and improving the designed system. In this work was applied the PLM Siemens NX software. This advanced CAD/CAE/CAM environment let to model any complex system of a technical mean. Using this environment it is possible to model and analyze new solution, which allow significantly optimizing the functioning conditions of a piston engine. One of such a solution is the MDI system presented in the work.

scholarly journals Ab Initio Multiscale Process Modeling of Ethane, Propane and Butane Dehydrogenation Reactions: A Review

Catalysts ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1405
Author(s):  
Luka Skubic ◽  
Julija Sovdat ◽  
Nika Teran ◽  
Matej Huš ◽  
Drejc Kopač ◽  
...  
Keyword(s):  
Functional Performance ◽  
System Modeling ◽  
Building Blocks ◽  
Operating Conditions ◽  
Gas Temperature ◽  
Reaction Products ◽  
Geometrical Properties ◽  
The Past ◽  
Engineering Environment ◽  
Dehydrogenation Reactions

Olefins are among the most important structural building blocks for a plethora of chemical reaction products, including petrochemicals, biomaterials and pharmaceuticals. An ever-increasing economic demand has urged scientists, engineers and industry to develop novel technical methods for the dehydrogenation of parent alkane molecules. In particular, the catalysis over precious metal or metal oxide catalysts has been put forward as an alternative way route to thermal-, steam- and fluid catalytic cracking (FCC). Multiscale system modeling as a tool to theoretically understand processes has in the past decade period evolved from a rudimentary measurement-complementing approach to a useful engineering environment. Not only can it predict various experimentally obtained parameters, such as conversion, activity, and selectivity, but it can help us to simulate trends, when changing applicative operating conditions, such as surface gas temperature or pressure, or even support us in the search for the type of materials, their geometrical properties and phases for a better functional performance. An overview of the current set state of the art for saturated organic short chain hydrocarbons (ethane, propane and butane) is presented. Studies that combine at least two different dimensional scales, ranging from atomistic-, bridging across mechanistic mesoscale kinetics, towards reactor- or macroscale, are focused on. Insights considering reactivity are compared.

scholarly journals BAPV SYSTEM MODELING FOR THE SINGLE-FAMILY HOUSE: A CASE STUDY

2020 ◽  
Vol 10 (3) ◽  
pp. 44-47
Author(s):  
Ewelina Krawczak
Keyword(s):  
Greenhouse Gases ◽  
Urban Areas ◽  
Fossil Fuels ◽  
System Modeling ◽  
Photovoltaic System ◽  
Energy Output ◽  
Single Family ◽  
Pv System ◽  
Detached House ◽  
System Configurations

The community all over the World has to tackle the problem of depletion of fossil fuels, overusing the natural resources, and growing emission of greenhouse gases into the atmosphere. It is related to the growing demand for electricity due to global development in every field. The solution to this problem can be production clean, solar energy with the use of photovoltaic modules. However, the installation of PV system in urban areas is very often impossible because of high-density citie’s architecture. The objective of this study was to analyze building applied photovoltaic system configurations for the flat rooftop of the detached house in Warsaw, Poland. Four configurations were analyzed taking into consideration the area of the rooftop, different tilt angles of PV modules, and shading areas. The system configuration as well as monthly energy output were carried out by the use of DDS-Cad software. The ecological aspect of the photovoltaic installation was also analyzed. A significant reduction of greenhouse gases was observed based on conducted calculations.

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