CAD-MBSE Interoperability for the Checking of Design Requirements Based on Assemblability Indicators

A mechanical product is the result of collaboration between different domains. In this paper we focus on the collaborative work that brings together the system engineer and the designer in the realization process of a mechanical system. A design solution, conceived in the CAD environment, is considered valid if all the specification requirements, defined in the MBSE (Model Based System Engineering) domain, are met. Thus, the preliminary study of these requirements has a major influence on the choice and validation of the design solution. In this paper a methodology for handling the requirements has been detailed. These requirements are classified into two main categories. The first one deals with the product performance and the second addresses the process performance in order to generate the best assembly sequence. Depending on the response of the designed solution to these requirements, it becomes easy to decide not only whether the design solution can be validated or not but also to choose the most optimal assembly sequence that ensures the best operation quality. A validation example of a speed reducer is used to demonstrate the added value of the proposed approach.

Value-Sensitive Design of Unmanned Aerial Systems

What happens when an engineer attempts to address the value-neutral paradigm and the holistic deficits in engineering science? This paper sets out to account for the interplay between an unmanned aerial system engineer acting as a “champion” of value sensitive design (VSD) and their more objectivist research organization. Action research methods are used by the authors in an attempt to implement VSD in a real-world research organization and thereby bridge the theory-practice gap. Primary empirical data are collected which indicate the engineer has internalized and often utilizes a VSD approach. Both barriers and catalysts to wider adoption of VSD within the organization are experienced, and recommendations for overcoming paradigmatic, strategic, structural, and cultural barriers are addressed. This work demonstrates how action research can be used to shift engineering away from a value-neutral paradigm towards the value-sensitive approach advocated by the authors.

Stochastic Extreme Wind Speed Modeling and Bayes Estimation under the Inverse Rayleigh Distribution

Inverse Rayleigh probability distribution is shown in this paper to constitute a valid model for characterization and estimation of extreme values of wind speed, thus constituting a useful tool of wind power production evaluation and mechanical safety of installations. The first part of this paper illustrates such a model and its validity to interpret real wind speed field data. The inverse Rayleigh model is then adopted as the parent distribution for assessment of a dynamical “risk index” defined in terms of a stochastic Poisson process, based upon crossing a given value with part of the maximum value of wind speed on a certain time horizon. Then, a novel Bayes approach for the estimation of such an index under the above model is proposed. The method is based upon assessment of prior information in a novel way which should be easily feasible for a system engineer, being based upon a model quantile (e.g., the median value) or, alternatively, on the probability that the wind speed is greater than a given value. The results of a large set of numerical simulation—based upon typical values of wind-speed parameters—are reported to illustrate the efficiency and the precision of the proposed method, also with hints to its robustness. The validity of the approach is also verified with respect to the two different methods of assessing the prior information.

Design Quality Assurance System «Product Studio»

The article describes the systems engineering processes, the current problems encountered in the work of a system engineer, the reasons for their occurrence and the goals, functionality of the new system tool “Product Studio”. «Product Studio» is Design Product Quality Assurance System and it aims to simplify the activities of the system engineer, providing the necessary functionality to perform the relevant processes from requirements definition and management, to the formation of architectural and technical solutions. Keywords: system engineering, system modeling tools, system life cycle process, software system, system engineering activities, architectural design, system modeling languages, current problems in the SE work

Inventory Accounting System Using System Engineering Methods

The article presents models of inventory accounting led by a project manager and system engineer. The project “Inventory accounting system using system engineering methods” is aimed at the formation of a separate inventory accounting system in the development, manufacture and production of products. In the framework of Ural Diesel Engine Plant LLC, such records are kept only for expensive components that are delivered with military acceptance in the context of each contract for each state contract. Even with such accounting at the enterprise, there is a problem of making small profits or lack of profit from the manufacture of military diesel generators. In developing my project, I would like to improve the system of accounting and writing off inventory items supplied with military acceptance, and later using this system for the entire list of components that make up the product. Keywords: systems engineer, project manager, lifecycle, management basics, separate accounting, management accounting, operational accounting, successful accounting system

Development of PV array configuration under different partial shading condition

This paper investigates the performances of different photovoltaic (PV) array under several shading condition. Four types of photovoltaic array configuration scheme which are ‘Series’ (S), Series-Parallel’ (SP), Total-Cross-Tied’ (TCT), and ‘Bridge-Link’ (BL) array topologies were tested by applying a 6x6 PV array under 6 different shading scenarios. The modeling is developed using Matlab/Simulink. The performances and output characteristics of photovoltaic array are compared and analyzed. System engineer can use the detailed characteristics of different array configuration to approximate the outcome power and pick the best configuration of the system by concerning the current natural condition to enhance the overall efficiency.

Proposing an Online Testing Method for Gradual Migration of Information and Control System

To respond to changes in the requirements of the information and control system, it is necessary to rebuild the system with new functions and/or systems with a different architecture. In this paper, we propose a method that enables on-site technicians to perform step-wise migration from a legacy system to a target system without having to stop the whole system and without requiring advance preparation or support from a system engineer who is an expert in system design and development. Accordingly, we aimed to develop a technology for the coexistence of and cooperation between with target and legacy systems and cooperation test between heterogeneous systems. We implemented this method and evaluated its effectiveness by applying it for rebuilding a production line management system.