Modelling and simulation of functioning of the GSh-23 aviation autocannon mechanisms

Article presents the simulation model and the study of the basic mechanisms of the GSh-23 aviation autocannon. The research made use of Solid Edge ST9 software and the multibody systems method implemented in it. Simulation of functioning cannon mechanisms was carried out for two variants of forcing a piston mechanism movement by the gunpowder gases. The results obtained are time courses of a bolt and a cartridge belt drive mechanism elements movement. Assumed variants of a piston mechanism movement and elaborated simulation model will be verified in the next (planned) stage of studies basing on the results of the measurements of the experimental kinematic parameters utilising high-speed camera (Phantom) and TEMA software.

Solid Edge 3D Model of Synthesized Geared Slider Crank Mechanism with Variable Topology Features

The paper introduces solid edge 3D model of synthesized geared slider crank mechanism. The synthesized mechanism exhibits the features of variable topology mechanism. This mechanism is modeled in solid edge software and presented. The gear connected to the crank provides the possibility of using it as an input and as well as output to the mechanism. The mechanism showcases the single input to multiple output variable topology features.

Comparison of Computer Extended Descriptive Geometry (CeDG) with CAD in the Modeling of Sheet Metal Patterns

The emergence of computer-aided design (CAD) has propelled the evolution of the sheet metal engineering field. Sheet metal design software tools include parameters associated to the part’s forming process during the pattern drawing calculation. Current methods avoid the calculation of a first pattern drawing of the flattened part’s neutral surface, independent of the forming process, leading to several methodological limitations. The study evaluates the reliability of the Computer Extended Descriptive Geometry (CeDG) approach to surpass those limitations. Three study cases that cover a significative range of sheet metal systems are defined and the associated solid models and patterns’ drawings are computed through Geogebra-based CeDG and two selected CAD tools (Solid Edge 2020, LogiTRACE v14), with the aim of comparing their reliability and accuracy. Our results pointed to several methodological lacks in LogiTRACE and Solid Edge that prevented to solve properly several study cases. In opposition, the novel CeDG approach for the computer parametric modeling of 3D geometric systems overcame those limitations so that all models could be built and flattened with accuracy and without methodological limitations. As additional conclusion, the success of CeDG suggests the necessity to recover the relevance of descriptive geometry as a key core in graphic engineering.

Development of an exoskeleton for the rehabilitation of the flexo-extensor movement of the elbow

In this research work, the development of an electro-mechanical device for the rehabilitation of the flexor-extensor movement of the elbow with rehabilitative potential is presented. For the development of this prototype, an elbow joint was designed and built which allows movements from 0 ° to 120 °. The design of the gear system was carried out using Solid Edge software from a previous selection of the step motor that offered enough torque to achieve flexion and extension of the elbow, then for the construction of this system a 3D printing was used in PLA. This system was coupled to a hinged arm stabilizer system. The prototype is operated from a software application on Android using the IDE MITapp inventor, which sends the desired angulation to an Arduino device which implements a digital control system. To improve the perception of exoskeleton therapy, a telerehabilitation software application was developed using IDE processing and a Kinect body recognition device, which guides the patient in an interactive therapy where they perform the rehabilitation of flexion and extension movement by guiding a virtual object from one angle to another.

Improving Aerodynamic Efficiency and Decreasing Drag Coefficient of an F1 in Schools Race Car

To improve the aerodynamic efficiency of a Formula One (F1) in Schools race car, the original model of the car is evaluated and compared with a new design. The ideas behind the new design are supported by research about aerodynamics. Different potential designs are created with CAD software Fusion 360 and evaluated within CFD software Solid Edge 2020 with FloEFD. Empirical data shows how specific changes to the structure of race cars can improve aerodynamic efficiency by decreasing their aerodynamic drag. The experimental data and methods of this study can provide help and guidance for teenagers participating in the F1 in Schools competition program to solve the aerodynamic performance problems of racing cars and thereby increase youth interest in STEM programs, as well as their opportunities to learn about engineering and enter engineering careers.

Generative Design in the Transmission System of a Skateboard

Generative design (GD) is a new way of designing products that respond to the current characteristics of the 4.0 industry era. It allows the customization of designs and helps to minimize process times and material quantities. In the case study, two parts of the transmission system of a skateboard have been designed using GD of Solid Edge ST10. The design has been customized for 67 kg users who will use the skateboard for riding and not for jumping or doing tricks. On the other hand, the aim was to minimize the weight and the use of material for its manufacture. Once the initial solid is defined, the software generates specific designs for different levels of mass reduction or product quality. An axle with a mass reduction of 70% from the initial solid and a base with reduction of 60% have been proposed. The GD more than an alternative is a requirement to respond to the demands of the 4.0 industry in which customization and cost reduction are one of the fundamental pillars. This type of design, at the same time, forces to adapt the manufacturing processes so that it is necessary to manufacture in additive manufacturing (AM) machines.

DIGITAL DESIGNING APPLYING GENERATIVE DESIGN

In this paper the two principal design methods applying in industry such as industrial design and computer-aided design and differences between them were studied. Design technology applying a generative design was considered. The most popular soft ware allowing a generative design realization is a Siemens Software – CAD/CAE-system Solid Edge with a wide range of tools for designing and analysis of new products. Procedure of generative design realization was carried out to determine an optimal geometrical shape of product taking into account specified boundary conditions and load using a CAD/CAE-system Solid Edge. The main goal of generative design is a rational using of source material for a final products manufacturing. When realization of generative design the preliminary analysis of loaded console to refine the values of strength and stiffness took place. Also, with the tool "Generative analysis" the generative analysis for geometrical model was made. As a result was two versions of generative analysis meeting a different requirements of customers. The main tendencies of generative analysis application for designing of a new product with less production and release time were presented.

PENGEMBANGAN PERANGKAT PMR DAN PENGARUHNYA TERHADAP HASIL BELAJAR MATEMATIKA PADA SISWA KELAS VIII SMP KATOLIK AMBON

This study aimed at: 1) producing a valid learning material of realistic mathematic for flat space solid edge material at VIII grade students of SMP Katolik Ambon; 2) finding out the effect of using learning material of mathematic realistic toward learning outcome for flat space solid edge material at VIII grade students of SMP Katolik Ambon. This study was an experiment research initialized by conducting development research to produce learning material oriented to realistic mathematic learning for flat space solid edge material at VIII grade. The development process of learning material followed the procedure of Thiagarajan 4-D model of development that had been modified without dissemination. The results of learning material development with realistic mathematic learning approach were lesson plan, learning material, students’ worksheet and learning outcome test, while the experiment was used to describe the learning effectiveness with realistic mathematic learning approach and to compare learning outcome between students who followed learning process with realistic mathematic learning approach and students who learnt conventionally for flat space solid edge material. The results showed that: 1) learning material with realistic mathematic learning approach for flat space solid edge material had fulfilled the criteria which was show by good expert validation, teachers’ activity in managing learning process, students’ activity, positive responses of teachers and students toward learning material and the average percentage of students learning outcome achieving 79% of whole students in the class; 2) students learning outcome was increased based on analysis of inferential statistic, so it could be concluded that the development of learning material of realistic mathematic affected students learning outcome for flat space solid edge material at VIII grade students of SMP Katolik Ambon