Vol 7, No 2 (2021)
- Year: 2021
- Articles: 5
- URL: https://dynvibro.ru/dynvibro/issue/view/520
Full Issue
Articles
INVESTIGATION OF THE INFLUENCE OF THE SPACING BETWEEN THE BORE OF THE THROTTLING SECTION OF THE SHUT-OFF AND CONTROL VALVES ON THE GENERATION OF THE HYDRODYNAMIC NOISE
Abstract
When designing the throttle sections of the shut-off and control valves, consisting of groups of holes, the question arises about the choice of the distance between the axes of the spacings. The article presents a numerical simulation of the throttling section of a hydraulic valve using two working media: water and fluid PGV . The dependences of the jet lengths on the center-to-center distance are presented. An experimental study of the dependence of the hydrodynamic noise on the center distance between the spacings was also carried out.
6-10
DESIGN OF A VALVE WITH A LINEAR FLOW CHARACTERISTIC
Abstract
The article discusses the method of designing the flow part of the valve based on the prototype valve to obtain a linear flow characteristic. The results of numerical simulation of the flow part in the Ansys Fluent software package of the source valve are presented. A method for adjusting the flow-through areas is described, the purpose of which is to fine-tune the valve characteristics to the required one.
11-16
FIBER-OPTIC SENSOR FOR PRESSURE MEASUREMENT IN PNEUMATIC-HYDRAULIC SYSTEMS
Abstract
The article discusses the issues of creating a fiberoptic pressure sensor for remote monitoring of the parameters of pneumatic and hydraulic highways intended for the transportation of fire and explosive media (flammable gases, liquids), or pneumatic-hydraulic systems operated in fire and explosive conditions. The proposed solution does not require explosion-proof design and uses elastic sensitive elements and polarimetric optical modulator, which are the simplest in terms of the production process. The principle of operation of a fiber-optic pressure sensor is described, a block diagram of its primary and secondary converters is given, a three-dimensional model of the sensor is devel-oped, according to which an experimental sample of the sensor is made and a stand for its study is developed. For the experimental sample, the working section of the conversion function is 3.5 ...6.5 bar, the average sensitivity value is 0.061 mW/bar (4.97 dBm/bar), the spread of the recorded optical power between the conversion curves in the working section does not exceed 2.62%. To ensure higher metrological characteristics of the sensor, corresponding design recommendations are given.
17-25
INCREASING THE SERVICE LIFE OF THE CONSTRUCTIVE ELEMENTS OF THE HYDRO-PNEUMATIC FIXTURES FOR CRAFTS AND FLIGHT-TYPE ENGINES
Abstract
The article discusses methods for estimation the loaded deformation state of structural elements of hydro-pneumatic fixtures using modern software application. It also shows a complex approach to the use of constructive and technological methods of increasing the durability of details. The possibility of using the method of diamond burnishing is considered on the example of hardening the surface of the valve body and flang. Also, this method is compared with other known technological methods of surface hardening.
26-33
DEVELOPMENT OF A METHOD FOR DETERMINING EIGENFREQUENCIES AND CARRYING OUT ACCELERATED RESONANCE TESTS FOR RELIABILITY OF VALVE SPRINGS OF AN INTERNAL COMBUSTION ENGINE
Abstract
Based on the available theoretical calculations and methods for determining natural frequencies, a method for determining the natural frequencies of valve springs of internal combustion engines was developed and tested. In the course of this work, the following results were obtained: a method was developed for determining the natural frequencies of the valve springs of an internal combustion engine, an experimental study was carried out to determine the natural frequencies of an internal combustion engine.
34-38