Method of adjusting fuel equipment of a diesel locomotive by heat release feature under operating conditions

Diesel engines supply mechanical power to almost half of the locomotives of the Russian railways. To ensure the passport characteristics of a diesel locomotive during the entire period of operation, periodic adjustment of the fuel supply equipment is required. When adjusting it, it is necessary to ensure the balance of power between the diesel cylinders while not exceeding the protective parameters for the maximum combustion pressure and the temperature of the exhaust gases. This is achieved due to the identity of the cyclic fuel supply through the diesel cylinders and the close correspondence of the fuel supply advance angles between different cylinders. Existing methods of tuning the fuel supply equipment don’t allow performing the adjustment with the required accuracy or are too complicated and laborious to implement. This article proposes theoretically substantiated and experimentally tested method for adjusting the cyclic supply and the fuel supply advance angle based on the results of measuring the pressure in the cylinder through a standard indicator channel under operating conditions. The indicator diagram is used to calculate the characteristics of active heat release, which are used to determine the relative parameters featuring the state of the fuel supply equipment. The performed computational study showed that the proposed parameters are equivalent to the relative cyclic fuel supply and the relative advance angle of the fuel supply. An experimental check, carried out on a single-cylinder compartment of OCH18/22 engine with hydromechanical fuel equipment, showed the possibility of adjusting the fuel supply equipment by the proposed method with satisfactory accuracy.

Low-frequency vibration damping of a plate with high vibration losses

Object and purpose of research. This work was an experimental check of the possibility to improve the efficiency of low-frequency vibration damping for structural plates with high initial losses of vibration energy. Materials and methods. Vibration dampers used in this study were resonant anti-vibration straps partially tuned to the frequency of intense plate vibrations. Main results. This work demonstrated the possibility of additional efficient vibration damping of a plate with high initial losses of energy at the lower frequencies of its bending resonances. Conclusion. It is shown that vibration dampers suggested by the authors are highly efficient, as well as feature lighter weight and lower thickness than conventional vibration dampers.

SELECTION OF RATIONAL POLISHING MODES FOR CLADDED CHROME COATINGS

As a result of experimental and statistical modeling, dependencies were obtained that establish the effect of polishing modes (the number of passes of the polishing wheel, the value of the wheel tightness) on the roughness and thickness of the chrome coating obtained by the method of deformation cladding with a flexible tool. It was found that within the selected intervals of variation of the factors, an increase in the tightness of the polishing wheel and the number of passes of the wheel leads to a decrease in both the parameter of the roughness Ra and the thickness of the coating, however, with different degrees of intensity. The number of passes of the polishing wheel has a decisive effect on the value of the surface roughness of the clad layer after polishing. The effect of polishing modes on the thickness of the cladded coating is more complex, since it is demonstrated both in the individual comparable influence of both factors and in their interaction. The optimal modes of polishing of hydraulic cylinder rods subjected to chromium plating by the method of deformation cladding with a flexible tool have been determined. After the experimental check in the conditions of JSC “Minsk Automated Lines Plant named after P.M. Masherov” (Republic of Belarus), the established technological modes of polishing were added to the technological process of chromium plating of rods. It confirms the effectiveness of using the calculated dependencies.

EXPERIMENTAL CHECK OF OPERATION OF A SINGLE-PHASE TWO-SEMI-PERIOD RECTIFIER

В данной статье будут проанализированы процессы в однофазной мостовой выпрямительной цепи с активной нагрузкой; определено среднее значение выпрямленного напряжения (тока) в цепи. Также будет рассчитана частота пульсации выпрямленного напряжения, коэффициент пульсации. Электрическая схема выпрямителя будет смоделирована в программном комплексе Multisim, который позволяет производить необходимые измерения. This article will analyze processes in a single-phase bridge rectifier circuit with an active load; the average value of the rectified voltage (current) in the circuit is determined. It will also determine the frequency of the ripple of the rectified voltage, the ripple coefficient. The electric circuit of the rectifier will be modeled in the Multisim software package, which allows monitoring the necessary measurements.

MANUFACTURE INVESTIGATION OF CARTRIDGE WITH BOTTOM-MOST PART FLANGE BY DIRECT EXTRUSION WITH COUNTERPUNCH. REPORT 18. EXPERIMENTAL CHECK OF THEORETICAL RESULTS FOR DIFFERENT HOLLOW RADIUSES AND BOTTOM-MOST PART THICKNESSES

The results of an experimental check of the obtained theoretical formulae allowing us to determine the most important parameters of extrusion cartridges with a counterpunch for different hollow radiuses and bottom-most part thicknesses are presented. Characteristics of used tools, geometric parameters of extrusion experiments, strength characteristics of deformed materials and lubricants are described in detail. Both strain-hardening material and strain-unhardening material were studied. Methodology of the theoretical calculations is demonstrated in detail. High accuracy of the obtained design formulae was confirmed.

MANUFACTURE INVESTIGATION OF CARTRIDGE WITH BOTTOM-MOST PART FLANGE BY DIRECT EXTRUSION WITH COUNTERPUNCH. REPORT 19. EXPERIMENTAL CHECK OF THEORETICAL RESULTS FOR DIFFERENT ANGLES OF DIE TAPER

The results of an experimental check of the obtained theoretical formulae allowing us to determine the most important parameters of extrusion of cartridges with a counterpunch for different angles of die taper are presented. Characteristics of used tools, geometric parameters of extrusion experiments, strength characteristics of deformed materials and lubricants are described in detail. Both strain-hardening material and strain-unhardening material were studied. Methodology of the theoretical calculations is demonstrated in detail. High accuracy of the obtained design formulae was confirmed.

MANUFACTURE INVESTIGATION OF CARTRIDGE WITH BOTTOM-MOST PART FLANGE BY DIRECT EXTRUSION WITH COUNTERPUNCH. REPORT 16. INITIAL EXPERIMENTAL CHECK OF THEORETICAL RESULTS

Objectives of the experimental check of the theoretical results were defined. Outcomes of the experimental check of obtained theoretical formulae allowing one to determine the most important parameters of the cartridge extrusion with a counterpunch are presented. Characteristics of used tools, geometric parameters of extrusion experiments, strength characteristics of deformed materials as well as lubricants are described in detail. The high precision of obtained design formulae was confirmed.

MANUFACTURE INVESTIGATION OF CARTRIDGE WITH BOTTOM-MOST PART FLANGE BY DIRECT EXTRUSION WITH COUNTERPUNCH. REPORT 20. EXPERIMENTAL CHECK OF THEORETICAL RESULTS WHEN EXTRUDING BRASS L63 AND STEEL 12Х18Н9Т

The results of an experimental check of the obtained theoretical formulae allowing us to determine the most important parameters of extrusion of cartridges with a counterpunch for hardening brass L63 and steel 12Х18Н9Т are presented. Characteristics of used tools, geometric parameters of extrusion experiments, strength characteristics of deformed materials and lubricants are described in detail. Methodology of the theoretical calculations is demonstrated in detail. High accuracy of the obtained design formulae was confirmed.

MANUFACTURE INVESTIGATION OF CARTRIDGE WITH BOTTOM-MOST PART FLANGE BY DIRECT EXTRUSION WITH COUNTERPUNCH. REPORT 17. EXPERIMENTAL CHECK OF THEORETICAL RESULTS WITH USE OF STRAIN-HARDENING MATERIAL

Results of the experimental check with the use of strain-hardening material, which was carried out for the obtained theoretical formulae allowing one to determine the most important parameters of the cartridge extrusion with a counterpunch, are presented. Methodology of the theoretical calculations, characteristics of used tools, geometric parameters of extrusion experiments, strength characteristics of deformed materials, as well as lubricants are described in detail. The high precision of obtained design formulae was confirmed.