scholarly journals Improving the maintenance program for passenger elevators based on simulation of their operating modes

2021 ◽  
Vol 21 (2) ◽  
pp. 171-183
Author(s):  
D. S. Apryshkin ◽  
G. Sh. Khazanovich ◽  
V. О. Gutarevich
Keyword(s):  
Mathematical Models ◽  
Simulation Modeling ◽  
Good Condition ◽  
Operating Time ◽  
Resource Development ◽  
Study Objective ◽  
Maintenance Schedule ◽  
Operating Modes ◽  
Maintenance Program ◽  
Power Load

Introduction. Elevators in residential and public buildings are the means of vertical transport. An elevator is one of the complex electromechanical devices of increased danger. Therefore, all stages of its life cycle are strictly limited by regulatory documents. The desired levels of safety and comfort are provided through the reasonable choice of the basic parameters and a constant maintenance of the system in good condition. The key factors that affect the implementation of regulatory requirements during the operation of the elevator installation are the quality of manufacturing of critical components, the level of real workload, taking into account the actual value of the spent resource, and the implemented maintenance program. Currently, when determining the maintenance schedule for elevators, such characteristics as the density of occupancy, the level of power loads, the actual operating time of the elevator and the counts of starts of the main drive are not taken into account. This study objective is the scientific rationale of the concept and methodology for developing the program of maintenance of specific elevator installations on the basis of studies of the level and mode of loading of load-bearing units. Materials and Methods. The use of simulation modeling techniques to assess the load level of power units of an elevator installation and its kinematic indicators under the action of numerous random impacts is validated in the paper. The development of an indicator that characterizes the complex mode of elevator operation, taking into account the joint influence of the level of resource development, net operating time, number of starts, and the power load of the nodes, required the application of an expert method. The final part of the research program is the formation of specific recommendations on the maintenance schedule of elevators. It is based on the ranking of particular indicators. Results. The performance feature of the elevator installation is that the service time of a customer is a function of many random variables. Mathematical models of the formation of force impacts are based on the representation of an electromechanical elevator as a dynamic one-degree-of-freedom system. Expressions for calculating the static tension of traction ropes and torques on the motor shaft are obtained. The problem of dynamics is solved. The loads whose values are the basis for performing simulation modeling of the operating modes of the elevator installation are determined. Discussion and Conclusions. Feasibility of the regulations for the maintenance of passenger elevators is an urgent task, the solution to which determines the level of safety and comfort of passengers. Currently, the standards for the design and operation of elevator installations do not link the frequency of maintenance programs with the level of load and the amount of resource development. The paper provides a general statement of the problem and a methodology for the formation of a complex factor of the equivalent load. Mathematical models are given for calculating the power and temporary loads of the elevator, taking into account the nature of numerous random impacts. 

scholarly journals Models and Algorithms of Adaptive Animal Flow Control in Rotary Milking Parlors

2019 ◽  
Vol 67 (6) ◽  
pp. 1465-1484
Author(s):  
Vladimir V. Kirsanov ◽  
Andrey Y. Izmaylov ◽  
Yakov P. Lobachevsky ◽  
Oksana A. Tareeva ◽  
Sergey N. Strebulyaev ◽  
...  
Keyword(s):  
Mathematical Models ◽  
High Performance ◽  
Dairy Farm ◽  
Computing System ◽  
Scientific Basis ◽  
Idle Time ◽  
Functional Connection ◽  
Operating Modes ◽  
Nizhny Novgorod Region ◽  
Physiological Characters

The study addresses the influence of milking duration of individual cows on the performance of conveyor-like rotary milking parlors and seeks to optimize their operation parameters and operating modes. The observational experiment was conducted in the Zhdanovsky Farm in Nizhny Novgorod Region, Russia. The dairy farm had a herd of 600 cows, divided into 10 groups by physiological characters and milk yield, and operated a 36 point milking parlor. Distribution of milking time of individual cows was studied using statistical analysis methods. The cyclogram of parlor operation and the functional connection of main parameters were analyzed using Maple analytical computing system, including its standard libraries and functions. The trends in idle time, which occurs due to undermilking of animals in one turn of the parlor, were studied. The idle time can result in overestimation of the number of stalls or decrease in the nameplate performance of the milking parlor by 30–40% from 120 to 93 cows per hour. Mathematical models, taking into account the influence of the milking time of individual animals (2 to 17 minutes) on the parameters of parlor operation, were developed. The algorithms of adaptive control over the rotational speed were proposed to minimize idle time in parlor operation and maintain the nameplate performance. The mathematical models, control algorithms and developed software can serves as a scientific basis for new designs of high-performance rotary milking parlors.

DEVELOPMENT OF A SUBSYSTEM FOR DIAGNOSTICS OF GYNECOLOGICAL DISEASES BASED ON STATISTICAL AND SIMULATION MODELING

2021 ◽  
pp. 94-98
Author(s):  
Екатерина Ивановна Новикова ◽  
Анастасия Юрьевна Корниенко
Keyword(s):  
Differential Diagnosis ◽  
Mathematical Models ◽  
Simulation Modeling ◽  
Clinical Laboratory ◽  
Software Product ◽  
Gynecological Diseases ◽  
Medical Structure ◽  
Diagnostic Signs ◽  
Attending Physician ◽  
Probabilistic Nature

В статье рассматриваются методы кластерного и дискриминантного анализа для построения математических моделей диагностики гинекологических заболеваний. Гинекологические патологии занимают значительное место в структуре заболеваемости у женщин. Между тем, точная дифференциальная диагностика патологий зачастую бывает, невозможна, так как гинекологические заболевания носят вероятностный характер, большинство диагностических признаков выражаются качественными показателями, которые индивидуальны для каждой пациентки. Лечащему врачу приходится решать сложную задачу по анализу клинических, лабораторных и инструментальных признаков для постановки точного диагноза. С применением аппарата сетей Петри произведено построения модели дифференциальной диагностики гинекологических заболеваний. На основе полученных математических моделей, сформирована структура и информационно-программное обеспечение для системы диагностики гинекологических заболеваний в медицинских организациях. Внедрение разработанного программного продукта в медицинскую структуру позволит уменьшить вероятность врачебной ошибки, а также повысить эффективность и точность постановки диагноза пациенткам The article discusses the methods of cluster and discriminant analysis for constructing mathematical models for the diagnosis of gynecological diseases. Gynecological pathologies occupy a significant place in the structure of morbidity in women. Meanwhile, accurate differential diagnosis of pathologies is often impossible, since gynecological diseases are of a probabilistic nature, most of the diagnostic signs are expressed in qualitative indicators that are individual for each patient. The attending physician has to solve a complex task of analyzing clinical, laboratory and instrumental signs to make an accurate diagnosis. Using the apparatus of Petri nets, a model for the differential diagnosis of gynecological diseases was constructed. On the basis of the obtained mathematical models, the structure and information software for the system of diagnostics of gynecological diseases in medical organizations was formed. The introduction of the developed software product into the medical structure will reduce the likelihood of medical error, as well as increase the efficiency and accuracy of diagnosing patients

scholarly journals Edge Computing: A Survey On the Hardware Requirements in the Internet of Things World

2019 ◽  
Vol 11 (4) ◽  
pp. 100 ◽  
Author(s):  
Maurizio Capra ◽  
Riccardo Peloso ◽  
Guido Masera ◽  
Massimo Ruo Roch ◽  
Maurizio Martina
Keyword(s):  
Internet Of Things ◽  
Mobile Devices ◽  
Information Exchange ◽  
Large Scale ◽  
Operating Time ◽  
Edge Computing ◽  
The Internet ◽  
Power Load ◽  
Battery Capacity ◽  
Iot Devices

In today’s world, ruled by a great amount of data and mobile devices, cloud-based systems are spreading all over. Such phenomenon increases the number of connected devices, broadcast bandwidth, and information exchange. These fine-grained interconnected systems, which enable the Internet connectivity for an extremely large number of facilities (far beyond the current number of devices) go by the name of Internet of Things (IoT). In this scenario, mobile devices have an operating time which is proportional to the battery capacity, the number of operations performed per cycle and the amount of exchanged data. Since the transmission of data to a central cloud represents a very energy-hungry operation, new computational paradigms have been implemented. The computation is not completely performed in the cloud, distributing the power load among the nodes of the system, and data are compressed to reduce the transmitted power requirements. In the edge-computing paradigm, part of the computational power is moved toward data collection sources, and, only after a first elaboration, collected data are sent to the central cloud server. Indeed, the “edge” term refers to the extremities of systems represented by IoT devices. This survey paper presents the hardware architectures of typical IoT devices and sums up many of the low power techniques which make them appealing for a large scale of applications. An overview of the newest research topics is discussed, besides a final example of a complete functioning system, embedding all the introduced features.

Representation of replacement rules in the form of a matrix

2016 ◽  
Vol 22 (2) ◽  
pp. 164-179
Author(s):  
Sergey Golovin
Keyword(s):  
Mathematical Models ◽  
Cost Structure ◽  
Verbal Description ◽  
System Component ◽  
Content Type ◽  
Maintenance Program ◽  
Repair Costs ◽  
System Components ◽  
The Matrix ◽  
The Cost

Purpose – The purpose of this paper is to represent replacement policies (rules) in the form of a matrix. Visualization of replacement rules is useful for maintenance records. Matrix representation is more effective than the verbal description usually provided, as it allows better understanding of the specifics of the different replacement rules without careful research of their mathematical models. Design/methodology/approach – This approach employs mathematical models to investigate the simple conditions (requirements) for replacement of system component with illustrative examples. When comparing the different replacement rules a cost structure is applied to takes into account the nature and technology of disassembly assembly actions for the repair unit. Findings – Representation of replacement rules in the matrix form is useful when describing planned replacement models, opportunity replacement models, group replacement models and others, as well as computer modeling of the renewal process. Forming simple conditions for the replacement of system components ensures the total average repair cost is minimized. These conditions can be applied in the early stages of creating a maintenance program for the machine. Practical implications – Replacement matrices can be specified in a technical manual for maintenance of machines to achieve reliable operation and to reduce repair costs. Replacement matrices can be put into practical use for maintenance records and may be included in the maintenance procedures library of CMMSs. Developed in the paper, the replacement matrix, the conditions for replacement of system components and the cost structure will help engineers to make decisions at the time of repair for assembly units. Originality/value – Proposed in the paper is a new approach to the visualization of the replacement rules and cost structure which simplifies the analysis of options for repair actions. The proposed technique contributes to the record of maintenance actions and the decision making process for replacement.

Evaluation of the immediate and long-term results of endovascular treatment of ruptured vertebrobasilar artery aneurysms in an acute period of hemorrhage

2019 ◽  
Vol 20 (4) ◽  
pp. 31-37
Author(s):  
E. O. Ivankova ◽  
V. V. Darvin ◽  
M. A. Bessmertnykh
Keyword(s):  
Subarachnoid Hemorrhage ◽  
Endovascular Treatment ◽  
Vegetative State ◽  
Good Condition ◽  
Artery Aneurysm ◽  
Long Term Results ◽  
Study Objective ◽  
Acute Period ◽  
Endovascular Occlusion ◽  
Vertebrobasilar Artery

The study objective is to evaluate the results of endovascular treatment of patients with subarachnoid hemorrhage due to rupture of the vertebrobasilar artery aneurysm.Materials and methods. From 2011 to 2017, 26 patients underwent endovascular occlusion of the ruptured vertebrobasilar artery aneurysm in an acute period of hemorrhage in Surgut Clinical Hospital for Traumatology.Results. Endovascular interventions were performed in 1–14 days after the episode of the primary subarachnoid hemorrhage. Among the patients 53.8 % were in good condition at admission (Hunt–Hess grade I–II), 46.2 % had moderate and severe neurologic disability (Hunt–Hess grade III–IV). A good and satisfactory degree of aneurysm occlusion was achieved in 18 (69.3 %). Favorable outcome (modified Rankin Scale (mRS) 0–2) was achieved in 21 (80.7 %); 1 (3.7 %) had severe disability (mRS 4), 2 (7.8 %) – vegetative state (mRS 5). Lethal outcome (mRS 6) occurred in 2 (7.8 %). Unfavorable outcomes were caused by a severe vasospasm.Conclusions. Endovascular occlusion of vertebrobasilar artery aneurysms in the acute period of hemorrhage is an effective and safe method of treatment in patients with Hunt–Hess grade I–IV.

scholarly journals PREDICTING THE LIFETIME OF LORA BASED WIRELESS SENSOR NETWORKS USING A PROBABILISTIC MODEL OF MARKOV CHAINS

2021 ◽  
Vol 2 (336) ◽  
pp. 157-164
Author(s):  
M. K. Nurgaliyev ◽  
A. K. Saymbetov ◽  
B. N. Zholamanov ◽  
A. Т. Yeralkhanova ◽  
G. B. Zhuman
Keyword(s):  
Power Consumption ◽  
Communication Channel ◽  
Operating Time ◽  
Wireless Sensor ◽  
Sleep Mode ◽  
Monitoring Networks ◽  
Wireless Data ◽  
Transmission Cycle ◽  
Operating Modes ◽  
Wireless Data Transmission

Real-time monitoring systems and sensors are not complete without wireless data transmission modules. Improving energy efficiency requires examining various system parameters that affect the power consumption of transmitting and receiving devices. The most important parameter of any autonomous wireless network is its uptime. In this work, we used LoRa wireless modules on the SX1278 chip manufactured by Semtech to determine their power consumption in various operating modes. The obtained data were used to build a consumption model of the device when connected to a receiver. Three operating modes are considered: transmit mode, receive mode and sleep mode. In an ideal communication channel, all transmitted data reaches the receiver with 100% probability. In a real situation, data reaches the receiver with a certain probability, depending on the communication channel, transmission power, distance to the addressee, and network parameters. In this work, the occurrence of an error is random. In this case, the occurrence of an error during reception entails a lack of confirmation of receipt or a request for re-sending data. Sending data again increases the power consumption of the device and, consequently, decreases the operating time of the wireless device. This paper shows the dependences of the operating time on various initial monitored parameters of the device, such as: confirmation timeout, packet length, time of one transmission cycle and the maximum number of retransmissions in one cycle. The developed model for predicting the consumption of the device can be used in the design of autonomous wireless sensor monitoring networks.

scholarly journals INSTALAÇÕES PREDIAIS HIDRÁULICAS E SANITÁRIAS EM ESCOLAS PÚBLICAS: PATOLOGIAS E SATISFAÇÃO DOS USUÁRIOS

2016 ◽  
Vol 11 (2) ◽  
Author(s):  
Fabiana De Almeida Barros ◽  
Diego Vinícius Curvo Santiago Silva ◽  
Rafael Pedrollo de Paes
Keyword(s):  
Public Schools ◽  
Visual Inspection ◽  
Good Condition ◽  
Financial Resources ◽  
Plumbing System ◽  
End User ◽  
Mato Grosso ◽  
System Diagnosis ◽  
Maintenance Program ◽  
The Government

RESUMO: O presente trabalho tem como principal objetivo fazer o levantamento das condições dos sistemas prediais hidráulicos e sanitários de escolas públicas da regional norte do município de Cuiabá, Mato Grosso. Para isso, foram realizados estudos de diagnóstico desses sistemas em três diferentes edificações de tipologia educacional. O diagnóstico foi realizado por meio de inspeção visual e registros fotográficos dos ambientes sanitários, além da aplicação de questionário aos usuários das edificações. Como os dados coletados foram observados que os aspectos de maior insatisfação relacionam-se com manifestações patológicas de fácil intervenção e correção, como a falta de higiene, mau cheiro dos ambientes, vazamentos visíveis, entupimentos, mau posicionamento dos bebedouros e empoçamento de água. Nesse contexto, recomenda-se que a administração pública mantenha um programa contínuo de manutenção das escolas, a fim de prevenir ou diminuir essas manifestações. Dessa forma, seriam evitados grandes gastos com problemas de proporções majoradas por descuido e falta de manutenção, além disto, seriam mantidas condições apropriadas de saúde e o bom estado do ambiente educacional dos alunos. A maior contribuição deste trabalho é mostrar a situação em que se encontram os sistemas prediais hidráulicos sanitários das escolas públicas e, também, a identificação de que o bom estado das escolas públicas depende dos cuidados advindos desde a sua concepção até sua utilização pós-ocupação, contando suporte proveniente do governo e gestores, bem como, recursos financeiros que sejam adequados e suficientes para as necessidades de operação e manutenção e ao funcionamento adequado das atividades educacionais no Brasil. ABSTRACT: This study aims to survey the condition of water supply and drainage facilities of public schools in the northern regional city of Cuiabá, Mato Grosso - Brazil. For this, it was made a plumbing system diagnosis of facilities by visual inspection and photographic records data and a questionnaire to the users of the buildings. In the results, the aspects of greatest dissatisfaction are related to pathological manifestations of easy intervention, such as poor hygiene, bad smell, leaks, clogs, wrong positioning of troughs and puddling of water. In this context, it is recommended that the government keep a maintenance program of the schools in order to prevent or lessen these manifestations. Thus would be avoided more expenses with greater problems through carelessness and especially the health and good condition of the educational environment of students would be preserved. The major contribution of this work is to show the situation of building facilities of public schools and the identification that the good condition of public schools depend on care arising from its projection to the end user, with care from the government, with financial resources that are appropriate and sufficient to the needs of the correct functioning of educational activities in Brazil.

scholarly journals Promising model range career excavators operating time assessment in real operating conditions

2020 ◽  
Vol 242 ◽  
pp. 228 ◽  
Author(s):  
Sergey IVANOV ◽  
Polina IVANOVA ◽  
Sergey KUVSHINKIN
Keyword(s):  
Good Condition ◽  
Operating Time ◽  
Mining Industry ◽  
Negative Influence ◽  
Technical Condition ◽  
Operating Conditions ◽  
Economic Losses ◽  
Mining Machine ◽  
Mining Equipment ◽  
Detailed Assessment

The development prospects of the mining industry are closely related to the state and development of modern mining machinery and equipment that meet the technical and quality requirements of mining enterprises. Enterprises are focused on a quantitative assessment – the volume of mineral extraction, depending on the functioning efficiency of a promising series of mining machines, which include modern mining excavators. Downtime and unplanned shutdowns of mining excavators directly depend on the operating conditions of the mining machine, which has negative influence on the machine as a whole and its technical condition, which entails a decrease in the efficiency of using expensive mining equipment and economic losses of the mining enterprise. The rationale for external factors that affect the operating time and technical condition of mining excavators is given. For a more detailed assessment of the influence of external influences on the efficiency of operation of mining machines, the influencing factors are divided into two groups: ergatic, directly related to human participation, and factors of a natural-technogenic nature, where human participation is minimized. It was revealed that factors of a natural-technogenic nature have the greatest influence. An algorithm is proposed for a comprehensive assessment of the technical condition and forecasting of operating time both in nominal and in real operating conditions, taking into account factors of a natural and technogenic nature. It is proposed, based on the developed program for planning and evaluating the life of a mining excavator, to adjust the schedules for maintenance and repair (MOT and R) in order to minimize the number of unplanned downtime of a mining excavator and maintain it in good condition.

scholarly journals The Impact of Human Resources Development and Organizational Culture on Employee Performance

2021 ◽  
Vol 4 (2) ◽  
pp. 2227-2233
Author(s):  
E. Kosmajadi
Keyword(s):  
Organizational Culture ◽  
Human Resources ◽  
Human Resource Development ◽  
Human Resource ◽  
Employee Performance ◽  
Good Condition ◽  
Resource Development ◽  
Survey Method ◽  
Statistical Process ◽  
The Impact

Research is motivated by the phenomenon of low employee performance, presumably due to suboptimal human resource development and a less conducive organizational culture. The study aims to identify and analyze: a. human resource development, organizational culture, employee performance; b) the magnitude of the influence of human resource development on employee performance; c) the importance of the impact of organizational culture on employee performance; and the extent of the effect of human resource development and organizational culture on employee performance. This research uses a quantitative approach with a survey method. The data collection tool used a questionnaire distributed to 44 employees. The data obtained were analyzed descriptively and through a statistical process. The results showed: a. From the results of descriptive analysis of human resource development, organizational culture and employee performance are in good condition, but there are weaknesses in certain aspects. The results of the verification analysis show; b) human resource development has a significant effect on employee performance with a magnitude of influence of 66.69%; c) organizational culture has a significant impact on employee performance with the importance of the result of 51.84%; and d) the development of human resources and organizational culture together have an effect on employee performance with the magnitude of the influence of 78.30%, the remaining 21.70% is influenced by other factors that are not included in the model. In conclusion, both partially and simultaneously, human resources and organizational culture's development affects employee performance.

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