Application of Systems Engineering to Machine Design for Technology Students

Author(s):  
Anthony D’Angelo ◽  
Edwin K. P. Chong

This paper discusses the results of a literature search on implementing novel approaches to teaching engineering design as well as the need for teaching Systems Engineering (SE) at an undergraduate level. In addition, the paper presents the results and lessons learned by assigning a capstone project requiring students to develop a conveyor system using the 8-phase SE process and a project based collaborative design methodology. The instructor teaches the fundamentals of systems engineering, the concept of synthesis, and the basics of trade-off studies. Students learn how to use functional modeling and the proper use of a functional flow block diagram to transform design requirements into failure modes. Students perform traditional failure mode calculations, using a strength-resistance approach, on machine components such as shafts, bearings, gears, belts, chains, keyways, splines, clutches, springs, brakes, and bolts for the conveyor system’s transmission. The instructor assigns a conveyor system and its systems requirements and students must demonstrate their understanding of the SE process as well as being able to perform design calculations on various machine components. The students demonstrate their understanding of SE and failure modes by taking part in design reviews throughout the semester and a final engineering report.

Author(s):  
Naoto Kasahara ◽  
Izumi Nakamura ◽  
Hideo Machida ◽  
Hitoshi Nakamura ◽  
Koji Okamoto

As the important lessons learned from the Fukushima-nuclear power plant accident, mitigation of failure consequences and prevention of catastrophic failure became essential against severe accident and excessive earthquake conditions. To improve mitigation measures and accident management, clarification of failure behaviors with locations is premise under design extension conditions such as severe accidents and earthquakes. Design extension conditions induce some different failure modes from design conditions. Furthermore, best estimation for these failure modes are required for preparing countermeasures and management. Therefore, this study focused on identification of failure modes under design extension conditions. To observe ultimate failure behaviors of structures under extreme loadings, new experimental techniques were adopted with simulation materials such as lead and lead-antimony alloy, which has very small yield stress. Postulated failure modes of main components under design extension conditions were investigated according three categories of loading modes. The first loading mode is high temperature and internal pressure. Under this mode, ductile fracture and local failure were investigated. At the structural discontinuities, local failure may become dominant. The second is high temperature and external pressure loading mode. Buckling and fracture were investigated. Buckling occurs however hardly break without additional loads or constraints. The last loading is excessive earthquake. Ratchet deformation, collapse, and fatigue were investigated. Among them, low-cycle fatigue is dominant.


2018 ◽  
Author(s):  
Devin R. Berg

Inquiry-based learning is an educational approach that allows the student to take ownership over the education process by self-identifying a problem and formulating their own solution. The application of this method of teaching was explored in an introductory mechanics course taken by both engineering and engineering technology students. Students were tasked with applying the principles of fundamental static equilibrium analysis to objects found in their normal surroundings. The deliverable for this assignment consisted of a photograph of an object they found to be in static equilibrium and a short description of how the state of the object could be described mathematically. Student submissions for this task exhibited a wide range of quality and imagination. Examples of student work are presented along with discussion of lessons learned and recommendations for the use of this method in the future. The overall student response to this task was positive and thus these efforts will be expanded.


2021 ◽  
pp. 1-14
Author(s):  
Ashutosh Dikshit ◽  
Amrendra Kumar ◽  
Glenn Woiceshyn

Summary Interest is high in a method to reliably run single-trip completions without involving complex/expensive technologies (Robertson et al. 2019). The reward for such a design would be reduced rig time, safety risks, and completion costs. As described herein, a unique pressure-activated sliding side door (PSSD) valve was developed and field tested to open without intervention after completion is circulated to total depth (TD) and a liner hanger and openhole isolation packers are set. A field-provensliding-sleeve door (SSD) valve that required shifting via a shifting tool run on coiled tubing, slickline (SL), or wireline was upgraded to open automatically after relieving tubing pressure once packers (and/or a liner hanger) are set. This PSSD technology, which is integrable to almost any type of sand control screen, is equipped with a backup contingency should the primary mechanism fail to open. Once opened, the installed PSSDs can be shifted mechanically with unlimited frequency. The two- or three-position valve can be integrated with inflow control devices (ICDs) (includes autonomous ICDs/autonomous inflow control valves) and allows mechanical shifting at any time after installation to close, stimulate or adjust ICD settings. After a computer-aided design stage to achieve all the operational/mechanical requirements, prototypes were built and tested, followed by field installations. The design stage provided some challenges even though the pressure-activation feature was being added to a mature/proven SSD technology. Prototype testing in a full-scale vertical test well proved valuable because it revealed failure modes that could not have appeared in the smaller-scale laboratory test facilities. Lessons learned from the first field trial helped improve onsite handling procedures. The production logging tool run on first installation confirmed the PSSDs with ICDs opened as designed. The second field installation involved a different size and configuration, in which PSSDs with ICDs performed as designed. The unique two- or three-position PSSD accommodates any type of sand control or debris screen and any type of ICD for production/injection. The PSSD allows the flexibility to change ICD size easily at the wellsite. Therefore, this technology can be used in carbonate as well as sandstone wells. Wells that normally could not justify the expense of existing single-trip completion technologies can now benefit from the cost savings of single-trip completions, including ones that require ICD and stimulation options.


2021 ◽  
Author(s):  
John Muñoz ◽  
Samira Mehrabi ◽  
Yirou Li ◽  
Aysha Basharat ◽  
Jennifer Boger ◽  
...  

BACKGROUND Advancements in supporting personalized healthcare and wellbeing using virtual reality (VR) has created opportunities to use immersive games to support a healthy lifestyle for persons living with dementia (PLWD) and mild cognitive impairment (MCI). Collaboratively designing exercise-video games (exergames) as a multi-stakeholder team is fundamental to creating games that are attractive, effective, and accessible. OBJECTIVE This research explores the use of participatory design methods that involve PLWD in long-term care facilitates, exercise professionals, content developers, game designers, and researchers in the creation of VR exergames targeting physical activity promotion for PLWD/MCI. METHODS Conceptualization, collaborative design, and playtesting activities were carried out to design VR exergames to engage PLWD in exercises to promote upper-limb flexibility, strength and aerobic endurance RESULTS Our results demonstrate how different stakeholders contribute to the design of VR exergames that consider/complement complex needs, preferences, and motivators of an underrepresented group of end-users as well as game design elements that reflect feedback for therapists and researchers. CONCLUSIONS This study provides evidence that collaborative multi-stakeholder design results in more tailored and context-aware VR games for PLWD. The insights and lessons learned in from this research can be used by others to co-design games, including remote engagement techniques that were used during the COVID-19 pandemic.


2021 ◽  
Author(s):  
Duncan James McLachlan ◽  
Changlih Ee ◽  
Jeroen Veen ◽  
Fabien Cochet ◽  
Daniele Tomassi ◽  
...  

Objectives/Scope Systems engineering techniques, particularly requirements management, are critical to realizing the value of digital transformation to improve capital project delivery. Drawing on the results of a case study, this paper will demonstrate the value of using digital requirements management to exchange information through a project lifecycle, specifically showing benefits in the integrity of data transfer; more efficient procurement lifecycle; more robust deviation management; and bidirectional traceability of requirements, including full visibility and end to end verification and validation. Methods, Procedures, Process A requirement is a capability to which a project outcome (product or service) should conform, and the purpose of requirements management is to ensure that an organization documents, verifies and validates these capabilities. In this case study the operator provides their technical specifications in the form of requirements. These requirements are then imported into the EPC's PLM platform, where they are supplemented with additional information from the EPC's engineers to create a requirements-based requisition package. This is then transmitted to the equipment supplier, where it is reviewed and, for the purposes of the case study, reviewed for completeness. To test the ability to identify changes and deviations, the EPC engineer modified the requirements and the file was transferred to both the operator and equipment supplier to ensure the changes were transferred and were identifiable. The case study also demonstrates how verification activities (testing, commissioning, etc.) can be linked to requirements; passed through the supply chain and be modified to capture changes to the status of the activity (such as test results). Results, Observations, Conclusions The case studies described show how requirements can be exchanged between operator, EPC and equipment supplier without any loss of data. It will also show how this approach allows a data driven approach, as opposed to a document driven approach, to be deployed in the requisitioning process, which could facilitate substantial reduction in the procurement lifecycle. This is achieved by removing extraneous information exchanged between the companies; the removal of swivel chair solutions, where data is extracted from one system and transferred to another; and expediting the bid evaluation stage. Finally, the case study will demonstrate how this approach could be extended beyond the purchase order to provide a direct link between specific requirements and testing (FATs) or commissioning activities, which facilitates a more efficient process for verification as well as ensuring a digital record of the entire lifecycle of a package. The case study highlighted the importance of aligning data model and developing workflows, these findings are captured in the lessons learned section and have been shared with the International Association of Oil and Gas Producers (IOGP) Requirements Digitalization Task Force (RDTF). Novel/Additive Information The paper will also include a vision of requirements models can be used to establish a holistic requirements model of a project, including the interdependencies of different system components. The case study will also demonstrate how the adoption of a common data standard for requirements allows a software agnostic solution that can be adopted by all.


2019 ◽  
Vol 35 (3) ◽  
pp. 313-321 ◽  
Author(s):  
Erik Christian Stanek ◽  
Sarah Taylor Lovell

AbstractSince 1985, land retirement has been the primary approach used by the federal government for environmental protection of agricultural landscapes, but increasingly it is being supplemented by conservation initiatives on working lands. This shift logically supports agroforestry and other multifunctional approaches as a means to combine production and conservation. However, such approaches can be complex and difficult to design, contributing to the limited adoption in the USA. To understand and improve the integration of multifunctional landscapes into conservation programs, we worked with 15 landowners in a collaborative design process to build unique conservation plans utilizing agroforestry. We interviewed participants before and after the design process to examine the utility of a personalized design process, applicability of agroforestry to conservation programs and pathways to improve conservation policy. We found that landowners strongly preferred working in person for the design process, and being presented a comparison of alternative designs, rather than a single option, especially for novel systems. Agroforestry was seen as a viable method of generating conservation benefits while providing value to the landowners, each of whom stated they were more inclined to adopt such practices irrespective of financial assistance to do so. For conservation programs, landowners suggested reducing their complexity, inflexibility and impersonal nature to improve the integration of multifunctional practices that appeal directly to the practitioner's needs and preferences. These findings are valuable for conservation policy because they complement previous research theory suggesting the value of working collaboratively with landowners in the design of multifunctional landscapes. Personalized solutions that are developed based on the unique characteristics of the local landscape and the preferences of the individual landowner may be retained beyond a specified payment period, rather than being converted back into annual crop production.


Author(s):  
Gee-Yong Park ◽  
Sup Hur ◽  
Dong H. Kim ◽  
Dong Y. Lee ◽  
Kee C. Kwon

This paper describes a software safety analysis for a software code that is installed at an Automatic Test and Interface Processor (ATIP) in a digital reactor protection system. For the ATIP software safety analysis, an overall safety analysis is at first performed over the ATIP software architecture and modules, and then a detailed safety analysis based on the software FMEA (Failure Modes and Effect Analysis) method is applied to the ATIP program. For an efficient analysis, the software FMEA is carried out based on the so-called failure-mode template extracted from the function blocks used in the function block diagram (FBD) for the ATIP software. The software safety analysis by the software FMEA, being applied to the ATIP software code which has been integrated and passed through a very rigorous system test procedure, is proven to be able to provide very valuable results (i.e., software defects) which could not be identified during various system tests.


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