scholarly journals AUTOMOTIVE ELECTRIC FUEL PUMP’S FAULTS: RESULTS OF THE PHYSICAL MODELING

2019 ◽  
Vol 16 (5) ◽  
pp. 592-604
Author(s):  
A. V. Puzakov
Keyword(s):  
Electric Motor ◽  
Physical Modeling ◽  
Electrical Resistance ◽  
Significant Proportion ◽  
Technical Condition ◽  
Current Consumption ◽  
Developed Pressure ◽  
Electric Fuel Pump ◽  
Critical Resistance ◽  
Resistance Value

Introduction. A significant proportion of the fuel pump’s faults is associated with an electric motor (about 40%), the technical condition of which is determined by the value of the electrical resistance of the winding circuit. However, direct measurement of electrical resistance without removing the vehicle is difficult. Therefore, it is possible to diagnose the performance of the electric motor (and the pump as a whole) by the amount of consumed current.Materials and methods. The author used physical modeling of faults by adjustable resistance for acceleration of the experiment and establishment of precise limits in the efficiency of the electric motor. The criterion for the operability of an electric fuel pump was the value of the developed pressure of at least 0.25 MPa.Results. An increase in the series-connected resistance led to a decrease in the current consumption of the pump, as well as a decrease in its performance. When the critical resistance value reached 11.2 ohms, the pump stopped working. A decrease in the resistance connected in parallel also led to a decrease in the current consumed by the pump since a significant part of it is bypassing of the electric motor through resistance. When the critical resistance value of 0.2 Ohm was reached, the pump stopped working.Discussion and conclusions. As a result, the author develops the mathematical model of the electric motor’s efficiency, which allows determining its technical condition by the usage both the value of electrical resistance and the consumed current. Moreover, measuring the current consumed by an electric motor serves as the basis for diagnosing electric fuel pumps directly on a vehicle and reduces the labor intensity and downtime of vehicles under repair.

scholarly journals TECHNICAL CONDITION OF PRECAST BEAMS WITH THE USE OF EXPANDED LIGHTWEIGHT CONCRETE HOLLOW-CORE SLABS

2019 ◽  
pp. 35-42
Author(s):  
Г. Смоляго ◽  
G. Smolyago ◽  
С. Дрокин ◽  
S. Drokin ◽  
А. Дронов ◽  
...  
Keyword(s):  
Lightweight Concrete ◽  
Significant Proportion ◽  
Physical And Mechanical Properties ◽  
Technical Condition ◽  
Building Structures ◽  
Hollow Core ◽  
Shear Cracks ◽  
Total Load ◽  
Normative Documents ◽  
Methods Of Calculations

The use of expanded lightweight concrete for the production of building structures can significantly reduce the weight, which is important in the manufacture of hollow-core slabs; the weight is a significant proportion of the total load. In the current regulatory documents, the physical and mechanical properties of expanded lightweight concrete differ significantly, and sometimes contradict each other. The defects and damages of expanded lightweight concrete hollow-core slabs are described in the case of the kindergarten built near 50 years ago. They appeared during the manufacture of the slabs - uncompacted concrete and uncovered ribs, or in the course of exploitation of the building - normal cracking, holes for pipes and corrosion of reinforcement. Two slabs in emergency condition have numerous longitudinal and shear cracks and chips of concrete caused by overloading. The differences in normative documents and methods of calculations used at the time of designing the kindergarten building and at the present time are shown. The assessment of the technical condition of the expanded lightweight concrete hollow-core slabs considering defects and damages are carried out

scholarly journals The Development of a New Sensor for Tool Face Angle Based on Electrical Resistance

2019 ◽  
Vol 2019 ◽  
pp. 1-8
Author(s):  
Chuan Wu ◽  
Jian Pan ◽  
Guojun Wen
Keyword(s):  
Measurement Error ◽  
Working Conditions ◽  
Electrical Resistance ◽  
Large Temperature ◽  
Temperature Drift ◽  
Trenchless Technology ◽  
Angle Sensor ◽  
Temperature Changes ◽  
Drilling Rig ◽  
Resistance Value

Trenchless technology is a type of construction that requires pipelines to be laid in a subsurface horizontal hole drilled by a trenchless drilling rig. To prevent drilling accidents during construction, the drilling trajectory needs to be controlled in real time according to the value of the tool face angle. However, existing tool face angle sensors cannot precisely control a trenchless drilling course due to a number of limitations such as low resolution, large temperature drift, and high requirements for accurate installation. In this regard, this paper presented a new tool face angle sensor based on the change in electrical resistance value. The tests mainly include four aspects, namely, accuracy, repeatability, resolution, and temperature drift. Numbers of tests showed that the measurement error was ±6 degrees, the repeatability was 2.54%, the minimum resolution was 6 degrees, and the temperature drift had no effect during the temperature changes from 0 to 80 degrees, which proved that the sensor is applicable for practical trenchless working conditions.

Development of the Electric Fuel System for the More Electric Engine

2014 ◽  
Author(s):  
Noriko Morioka ◽  
Hitoshi Oyori ◽  
Yukinori Gonda ◽  
Kenji Takamiya ◽  
Yasuhiko Yamamoto
Keyword(s):  
Electric Motor ◽  
Aircraft Engine ◽  
Fuel System ◽  
Motor Speed ◽  
Pump System ◽  
Fuel Pump ◽  
Fuel Flow ◽  
Set Up ◽  
Electric Fuel Pump ◽  
Electric Engine

This paper describes the experimental rig test result of the electric motor-driven fuel pump system for the MEE (More Electric Engine). The MEE is an aircraft engine system concept, which replaces conventional mechanical/hydraulic driven components with electric motor-driven components. Various MEE approaches have been studied since the early 2000s and one of its key concepts is an electric motor-driven fuel pump [1–4]. The authors commenced a feasibility study of the electric motor-driven gear pump system for what was assumed to be a small-sized turbofan engine. The concept study and system design were conducted, whereupon technical issues for the electric fuel pump system, which both supplies and meters fuel via the motor speed control, were clarified [5, 6]. Since one of the key issues is fuel-metering accuracy, the electric fuel system, including a flow feedback closed-loop control, was designed to ensure accurate fuel-flow metering for aircraft engine applications. To verify the rig system, an experimental model of the electric fuel pump system is assumed for a small-sized turbofan engine. The hardware of the motor-driven fuel pump and flow measurement mechanism, including an FPV (Fuel-Pressurizing Valve) and orifice, were designed, manufactured and fabricated and a differential pressure sensor for flow feedback was selected. Other equipment was also prepared, including a motor controller, power source and measurement devices, and the entire rig set-up was constructed. A bench test using the rig test set-up was conducted to verify the fuel-metering accuracy, response and system stability. Data, including the static performance and frequency response, were obtained for the electric motor, motor-driven fuel pump and entire fuel system respectively. The rig test results indicate the feasibility of the system, which will provide an accurate engine fuel flow (Wf) measurement and frequency response required for actual engine operation, via an electric motor speed control and fuel-flow feedback system, as proposed in the MEE electric fuel system.

Wheel Slip Detection for Electric Drive in Planetary Exploration Vehicles

2020 ◽  
Vol 17 (9) ◽  
pp. 4122-4124
Author(s):  
Bishwajit Pal ◽  
Samitha Khaiyum
Keyword(s):  
Real Time ◽  
Electric Drive ◽  
Electric Motor ◽  
Control Algorithm ◽  
Planetary Exploration ◽  
Wheel Slip ◽  
Current Consumption ◽  
Dc Electric Motor ◽  
Slip Detection

This article illustrates a technique for tracking longitudinal wheel slips in real time using an embedded microcontroller to map current consumption against real-time current consumed by the engine. This system can be used and operated separately of each other on more than one wheel. To detect wheel slippage, a predefined slip curve mapped to a specific DC electric motor is mapped against the current consumed by the same operational motors. This paper also recommends a convenient control algorithm to calculate its slippage of the wheel in real time. This approach is implemented using distinct load and terrain on a planetary exploration robot.

scholarly journals Electroresistive method for monitoring the technical condition, quality, reliability and safety the supports of rolling of electrical machines

2022 ◽  
Vol 1211 (1) ◽  
pp. 012021
Author(s):  
K V Podmasreryev ◽  
V V Markov ◽  
V V Mishin ◽  
A V Selikhov ◽  
N V Uglova
Keyword(s):  
Mathematical Modeling ◽  
Electrical Resistance ◽  
Experimental Studies ◽  
Rolling Bearing ◽  
Technical Condition ◽  
Electric Machines ◽  
The State ◽  
Electrical Machines ◽  
Technical State ◽  
Internal Environment

Abstract The necessity of monitoring the technical condition of the rolling supports of electric machines has been substantiated. It is proposed to use the electrical resistance of the bearing as an indicator of the technical condition the rolling support. The results of mathematical modeling of electrical resistance in the form of a function of resistance from factors of the internal environment of the bearing and modes of its assembly and operation in a rolling bearing are presented. An electroresistive method for monitoring the technical state the rolling support is proposed, which differs from the known methods by original algorithms for collecting information about the state of bearing parts, experimental studies have been carried out to confirm the efficiency of this method.

scholarly journals Vibration diagnostic of electric motor roller bearings

2019 ◽  
Vol 124 ◽  
pp. 02008 ◽  
Author(s):  
N. V. Hruntovich ◽  
N. V. Hruntovich ◽  
A. A. Kapanski ◽  
I. V. Petrov ◽  
E. E. Kostyleva
Keyword(s):  
Electric Motor ◽  
Power Plants ◽  
Rolling Bearing ◽  
Technical Condition ◽  
Diagnostic Model ◽  
Rolling Bearings ◽  
Accuracy Class ◽  
Vibration Diagnostics ◽  
Bearing Defects ◽  
Asynchronous Motors

The low quality of the new rolling bearings leads to additional costs for electric motor repair, and additional expenses connected with the technological process, value of which can reach from several thousand to tens of thousand dollars. To increase detection, the reliability of rolling bearing defects of asynchronous motors, complex vibration diagnostics was used at informative frequencies in the vibration frequency and amplitude in the range of 5-5000 Hz. Based on the diagnostic model of rolling bearings the software program “Tayamnitsa” is developed, which allows to calculate the diagnostic frequency corresponding to certain defects, determine the defect level and form a diagnostic table for defects. Vibration diagnostics of new and used rolling bearings have been conducted for various regional enterprises and power plants. It has been determined that 40-50% of used bearings are removed in good technical condition. When new bearings were diagnosed in the 500-5000 Hz range, only 48.4% of the bearings are considered serviceable due to the low accuracy class of metal processing and unacceptably high vibration level.

scholarly journals Modeling of failures of the starter electric motor

2019 ◽  
Vol 298 ◽  
pp. 00006 ◽  
Author(s):  
Andrey Puzakov
Keyword(s):  
Electric Motor ◽  
Electrical Resistance ◽  
Internal Combustion Engines ◽  
Traffic Accidents ◽  
Road Traffic ◽  
Short Circuit ◽  
Combustion Engines ◽  
Road Traffic Accidents ◽  
In Series ◽  
Electrical Faults

Failures of automotive starters make it impossible to reliably start internal combustion engines, which, under adverse circumstances, may cause a risk of road traffic accidents. A significant part of starter failures is associated with electrical faults in electric motors. The occurrence and development of failures causes a change in the torque produced by the starter. A mathematical model of the starter’s performance dependant from the magnitude of the electrical resistance of its windings was developed. Physical modeling of failures was carried out using an adjustable active resistance connected in series and parallel to the armature winding. Critical values of electrical resistance correspond to an open and short circuit of the armature winding of the starter electric motor, and, consequently, to starter failure. The results obtained are instrumental to the development of a diagnostics method for automotive starters without removing them from the motor.

scholarly journals Influence of the technical condition of the 011-1-02N Remdetal installation on the quality of the coatings formed

2021 ◽  
pp. 42-44
Author(s):  
A.I. Fomin ◽  
◽  
P.V. Senin ◽  
V.V. Vlaskin ◽  
I.A. Baranov ◽  
...  
Keyword(s):  
Surface Layer ◽  
Electrical Resistance ◽  
Technical Condition ◽  
Resistance Welding ◽  
High Quality ◽  
Quality Surface ◽  
High Quality Surface

The main modules of the 011-1-02N Remdetal installation for steel tape electrical resistance welding are described. The plant malfunctions arising during operation are identified. The analysis of the influence of these faults on the formation of a high-quality surface layer during the restoration of parts is performed. Recommendations on the maintenance operations of the modules under consideration are given.

scholarly journals Electrical Properties Enhancement of Carbon Nanotube Yarns by Cyclic Loading

Molecules ◽  
2020 ◽  
Vol 25 (20) ◽  
pp. 4824
Author(s):  
Orli Weizman ◽  
Joey Mead ◽  
Hanna Dodiuk ◽  
Samuel Kenig
Keyword(s):  
Electrical Conductivity ◽  
Carbon Nanotube ◽  
Cyclic Loading ◽  
Electrical Resistance ◽  
High Performance ◽  
High Strength ◽  
Intrinsic Properties ◽  
Ambient Conditions ◽  
Resistance Value ◽  
Carbon Nanotube Yarns

Carbon nanotube yarns (CNTYs) possess low density, high conductivity, high strength, and moderate flexibility. These intrinsic properties allow them to be a preferred choice for use as conductive elements in high-performance composites. To fully exploit their potential as conductive reinforcing elements, further improvement in their electrical conductivity is needed. This study demonstrates that tensile cyclic loading under ambient conditions improves the electrical conductivity of two types of CNTYs. The results showed that the electrical resistance of untreated CNTYs was reduced by 80% using cyclic loading, reaching the resistance value of the drawn acid-treated CNTYs. Scanning electron microscopy showed that cyclic loading caused orientation and compaction of the CNT bundles that make up the CNTYs, resulting in significantly improved electrical conductivity of the CNTYs. Furthermore, the elastic modulus was increased by 20% while preserving the tensile strength. This approach has the potential to replace the environmentally unfriendly acid treatment currently used to enhance the conductivity of CNTYs.

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