Vladimir A. Ovchinnikov, Evgeny A. Kilmyashkin, Aleksey S. Knyazkov, Alena V. Ovchinnikova, Nikolay A. Zhalnin, and Evgeny S. Zykin
Инженерные технологии и системы, Vol 32, Iss 4, Pp 222-234 (2022)
mineral fertilizers, energy-saving technologies, working tool, uniformity of distribution, 3d, cad model, prototyping, experimental research, Engineering (General). Civil engineering (General), TA1-2040, Technology (General), and T1-995
Introduction. Improvement of the agro-industrial complex involves the creation of new and modernizations of existing working tools and machines. The important conditions for this are the application of modern technologies and ongoing cooperation with the actual manufacturing. The aim of the research is to develop an adaptive centrifugal working tool and improve the quality of mineral fertilization. Materials and Methods. The adaptive centrifugal working tool was developed and manufactured based on studying the state of the matter and requirements to machines for mineral fertilization. At all stages of the research, there were used computer-aided design and rapid prototyping methods based on additive technologies. Results. As a result of the use of the presented working tools, the machine operating width has increased by 10.0‒22.5%. Experimental working tools, in comparison with serial ones, allow decreasing uneven distribution of mineral fertilizers by 13.4% due to their redistribution from the central zone to the edges. Discussion and Conclusion. As a result of experimental studies, the efficiency of the developed adaptive centrifugal working tools has been proved. It allows increasing uniformity of mineral fertilizer distribution and the machine operating width. Modern design methods make it possible to considerably reduce time and costs.
Lisa Alice Hwang, Chi-Yuan Chang, Wei-Chia Su, Chi-Wha Chang, and Chien-Yu Huang
BMC Oral Health, Vol 22, Iss 1, Pp 1-8 (2022)
Autotransplantation, Rapid prototyping, Root canal treatment, Dentistry, and RK1-715
Abstract Background Autotransplantation is a beneficial treatment with a high success rate for young patients. However, most adult patients require root canal treatment (RCT) of the donor teeth after the autotransplantation procedure, which causes a prolonged treatment time and additional expenses and increases the rate of future tooth fracture. Rapid prototyping (RP)-assisted autotransplantation shortens the extra-alveolar time and enables a superior clinical outcome. However, no cohort studies of the application of this method on adult populations have been reported. Methods This study is a retrospective cohort study. All patients underwent autotransplantation from 2012 to 2020 in the Kaohsiung and Chia-Yi branches of Chang Gung Memorial Hospital, and the procedure and clinical outcomes were analysed. Differences in clinical outcomes, age, sex, extra-alveolar time, fixation method, and RCT rate were compared between the two groups. Results We enrolled 21 patients, 13 treated using the conventional method and 8 treated using the RP-based technique. The RCT rates of the conventional group and RP group were 92.3% and 59%, respectively. The mean age of the two groups was significantly different (28.8 ± 10 vs. 21.6 ± 2.1); after performing subgroup analysis by excluding all of the patients aged > 40 years, we found that the RCT rates were still significantly different (91.0% vs. 50%). The mean extra-alveolar time was 43 s in the RP group, and the autotransplantation survival rate in both groups was 100%. Conclusions Rapid prototyping-assisted autotransplantation was successfully adopted for all patients in our study population. By shortening the extra-alveolar time, only 50% of the patients required a root canal treatment with a 100% autotransplantation survival rate. Trial Registration : Retrospectively registered.
In this paper, Rapid Control Prototyping (RCP) of five-level Modular Multilevel Converter (MMC) based Induction Motor (IM) drive performance is observed with different switching frequencies. The Semikron based MMC Stacks with two half-bridge each are tested with the switching logic generated by phase and level shifted based Sinusoidal Pulse Width Modulation (SPWM) technique. The switching logic is generated by the Typhoon Hardware in Loop (HIL) 402. The disadvantages of Multilevel Converter like not so good output quality, less modularity, not scalable and high voltage and current rating demand for the power semiconductor switches can be overcome by using MMC. In this work, the IM drive is fed by MMC and the experimentally the performance is observed. The performance of the Induction Motor in terms of speed is observed with different switching frequencies of 2.5kHz, 5kHz, 7.5kHz, 10kHz, 12.5kHz and the results are tabulated in terms of Total Harmonic Distortion (THD) of input voltage and current to the Induction Motor Drive. The complete model is developed using Typhoon HIL 2021.2 Version Real-Time Simulation Software.
The present research addresses a comparative analysis among Additive (ARP) and Subtractive (SRP) rapid prototyping techniques, aiming to determine which approach presents greater technical and economic viability for physical prototype manufacturing. The Analytic Hierarchy Process (AHP) multi-criteria decision method was used to categorize and quantify the analysis criteria. The analyzed Rapid Prototyping (RP) techniques were the Computer Numerical Control (CNC) milling as SRP technique and the Fused Deposition Modeling (FDM) process as ARP. The SRP rapid prototyping technique is the most suitable alternative for manufacturing prototypes, according to the analyzed evaluation criteria.
Emre Yildiz, Charles Møller, Arne Bilberg, and Jonas Kjær Rask
Complex Systems Informatics and Modeling Quarterly, Vol 0, Iss 29, Pp 1-16 (2021)
virtual factory, digital twin, virtual prototyping, virtual reality, simulation and modeling, industry 4.0, Information technology, and T58.5-58.64
Shortening lifecycles and increasing complexity make product and production lifecycle processes more challenging than ever for manufacturing enterprises. Virtual Prototyping (VP) technologies promise a viable solution to handle such challenges in reducing time and physical builds as well as increasing quality. In previous studies, the Digital Twin (DT) based Virtual Factory (VF) concept showed significant potential to handle co-evolution by integrating 3D factory and product models with immersive and interactive 3D Virtual Reality (VR) simulation technology as well as real-time bidirectional data synchronisation between virtual and physical production systems. In this article, we present an extension to the paper “Demonstrating and Evaluating the Digital Twin Based Virtual Factory for Virtual Prototyping” presented at CARV2021. The study presents an evaluation by industry experts of the DT based VF concept for VP in the context of New Product Introduction (NPI) processes. The concept is demonstrated in two cases: wind turbine blade manufacturing and nacelle assembly operations at Vestas Wind Systems A/S. The study shows that the VF provides an immersive virtual environment, which allows the users to reduce the time needed for prototyping. The industry experts propose several business cases for the introduced solution and find that the phases that would have the most gain are the later ones (production) where the product design is more mature.
National Land Agency received requests for land rights every day. The letters can be submitted through two stages of acceptance and archiving. Still using conventional systems makes data retrieval requires relatively more time. This research aims to design and build an information system data archiving for incoming request at the National Land Agency. The software has been designed with login feature, data management land owners and land owner data search and print feature data. Analysis of system requirements using object-oriented method which uses the use-case diagram in order to illustrate the functionality of the system and some of the criteria of non-functional requirements are also outlined. The next step was the coding implementation and evaluation of the system built. The system development method used was the prototyping method. The selection of this method was intended, therefore the client can get a clear picture of the system being built. Evaluation was conducted in the developer and the user environment. The evaluation in the user environment was done by distributing questionnaires covering three parameters namely the usefulness of the application, ease of use and user satisfaction. The results showed that the information systems built have a useful value (85.7%) and are easy to use (100%), therefore it satisfied the users.
Mihai Dragusanu, Danilo Troisi, Alberto Villani, Domenico Prattichizzo, and Monica Malvezzi
Frontiers in Robotics and AI, Vol 9 (2022)
wearable device, exoskeleton, differential mechanism, prototyping, rehabilitation, Mechanical engineering and machinery, TJ1-1570, Electronic computers. Computer science, and QA75.5-76.95
Exoskeletons and more in general wearable mechatronic devices represent a promising opportunity for rehabilitation and assistance to people presenting with temporary and/or permanent diseases. However, there are still some limits in the diffusion of robotic technologies for neuro-rehabilitation, notwithstanding their technological developments and evidence of clinical effectiveness. One of the main bottlenecks that constrain the complexity, weight, and costs of exoskeletons is represented by the actuators. This problem is particularly evident in devices designed for the upper limb, and in particular for the hand, in which dimension limits and kinematics complexity are particularly challenging. This study presents the design and prototyping of a hand finger exoskeleton. In particular, we focus on the design of a gear-based differential mechanism aimed at coupling the motion of two adjacent fingers and limiting the complexity and costs of the system. The exoskeleton is able to actuate the flexion/extension motion of the fingers and apply bidirectional forces, that is, it is able to both open and close the fingers. The kinematic structure of the finger actuation system has the peculiarity to present three DoFs when the exoskeleton is not worn and one DoF when it is worn, allowing better adaptability and higher wearability. The design of the gear-based differential is inspired by the mechanism widely used in the automotive field; it allows actuating two fingers with one actuator only, keeping their movements independent.