Localization of car engine noise sources

The engine of a vehicle, particularly a passenger car, is one of the main sources of noise radiated into the environment and creates a noise load in residential areas, which has a negative impact on people. Experts in the field of acoustics perform computational and experimental acoustic studies both at the design stage, and at the stage of putting into production and directly operating the engine as part of the car to reduce engine noise. An important stage of acoustic research is the localization of the most intensely radiating noise of systems, mechanisms, nodes and engine parts. The article presents the results of experimental studies on localization of internal combustion engine noise sources of a LADA car

Localization of car engine noise sources

The engine of a vehicle, particularly a passenger car, is one of the main sources of noise radiated into the environment and creates a noise load in residential areas, which has a negative impact on people. Experts in the field of acoustics perform computational and experimental acoustic studies both at the design stage, and at the stage of putting into production and directly operating the engine as part of the car to reduce engine noise. An important stage of acoustic research is the localization of the most intensely radiating noise of systems, mechanisms, nodes and engine parts. The article presents the results of experimental studies on localization of internal combustion engine noise sources of a LADA car

IMPROVING EFFICIENCY OF OPERATIONS PLANNING ON THE BASIS OF COMPUTER MODELLING OF PROCESSES OF HOLE WORKING WITH END MEASURING TOOLS

It has been established that in the process of forming holes the allowance on each cutting tool edge is divided into two parts, different bands of the allowance influencing the run-off and hole lay-out. A system of mathematical models and methods of computer adjustment and diagnosis of the hole working processes have been developed. The results have been introduced into practiceAvailable from VNTIC / VNTIC - Scientific & Technical Information Centre of RussiaSIGLERURussian Federatio

CONTROL SYSTEM OF RECTIFYING COLUMN DURING PRODUCTION OF HYDROGEN PEROXIDE BY AN ISOPROPYL METHOD

The aim is to develop the typical temperature profile stabilization subsystem of the rectifying column in structure of the computer-aided hydrogen peroxide manufacturing by an isopropyl method. The control system of the rectifying column according to the mathematical model of the multicomponent rectification process has been developed. In this case the model permits to calculate the temperature profile of the column, but the control system ensures the stabilization in the static condition of column depending on the consumption and composition of the feeding. The combined (according to the disturbance and deflection) control system which not only ensures the keeping of the designed temperature condition in the rectified column but and permits to develop the dynamic transfer from one condition to other condition has been developed. The developed control system of the rectifying column has been used at designing of the buieding hydrogen peroxide production (Morozov settlement of Leningrad region). Application field: chemical industry in productions in conditions of the information uncertainity connected with absence of the exhaustive information about phase equilibriumAvailable from VNTIC / VNTIC - Scientific & Technical Information Centre of RussiaSIGLERURussian Federatio

Factors and Objectives of Sustainable Development at the Implementation of Digital Technologies and Automated Systems in the Mining Industry

Mining inevitably violates the natural environment. The consequences of its functioning for the environment are diverse at different stages of the life of the enterprise. During mineral exploration, environmental damage is generally negligible, localized, and can be relatively easily repaired. Subsequent initial work, both with open pit and underground mining methods, has a more significant impact on the environment, but still less significant than with the development itself. During extraction and enrichment, the main production process, the most noticeable consequences are violation of land resources, pollution by wastewater, changes in hydraulic regime and composition of atmospheric air. The key factor, of course, is not how much land is used for any particular activity, but whether this use can be compatible with maintaining environmental integrity

Models and Methods of Designing Data-Centric Microservice Architectures of Digital Enterprises

The article is devoted to methods and models of designing systems for the digital transformation of industrial enterprises within the framework of the Industry 4.0 concept. The purpose of this work is to formalize a new notation for graphical modeling of the architecture of complex large-scale systems with data-centric microservice architectures and to present a variant of the reference model of such an architecture for creating an autonomously functioning industrial enterprise. The paper provides a list and justification for the use of functional components of a data-centric microservice architecture based on the analysis of modern approaches to building systems and the authors’ own results obtained during the implementation of a number of projects. The problems of using traditional graphical modeling notations to represent a data-centric microservice architecture are considered. Examples of designing a model of such an architecture for a mining enterprise are given

COL4A1/COL4A2 and inherited platelet disorder gene variants in fetuses showing intracranial hemorrhage.

BACKGROUND: Variants of COL4A1/COL4A2 genes have been reported in fetal intracranial hemorrhage (ICH) cases but their prevalence and characteristics have not been established in a large series of fetuses. Fetal neonatal alloimmune thrombocytopenia is a major acquired ICH factor but the prevalence and characteristics of inherited platelet disorder (IPD) gene variants leading to thrombocytopenia are unknown. Herein, we screened COL4A1/COL4A2 and IPD genes in a large series of ICH fetuses. METHODS: A cohort of 194 consecutive ICH fetuses were first screened for COL4A1/COL4A2 variants. We manually curated a list of 64 genes involved in IPD and investigated them in COL4A1/COL4A2 negative fetuses, using exome sequencing data from 101 of these fetuses. RESULT: Pathogenic variants of COL4A1/COL4A2 genes were identified in 36 fetuses (19%). They occurred de novo in 70% of the 32 fetuses for whom parental DNA was available. Pathogenic variants in two megakaryopoiesis genes (MPL and MECOM genes) were identified in two families with recurrent and severe fetal ICH, with variable extraneurological pathological features. CONCLUSION: Our study emphasizes the genetic heterogeneity of fetal ICH and the need to screen both COL4A1/COL4A2 and IPD genes in the etiological investigation of fetal ICH to allow proper genetic counseling