A novel fault diagnostic technique for gearboxes under speed fluctuations without angular speed measurement

2016 ◽  
Author(s):  
Liu Hong ◽  
Yongzhi Qu ◽  
Jaspreet Singh Dhupia ◽  
Yuegang Tan
Keyword(s):  
Diagnostic Technique ◽  
Angular Speed ◽  
Speed Measurement ◽  
Fault Diagnostic ◽  
Speed Fluctuations

scholarly journals A novel vibration-based fault diagnostic algorithm for gearboxes under speed fluctuations without rotational speed measurement

2017 ◽  
Vol 94 ◽  
pp. 14-32 ◽  
Author(s):  
Liu Hong ◽  
Yongzhi Qu ◽  
Jaspreet Singh Dhupia ◽  
Shuangwen Sheng ◽  
Yuegang Tan ◽  
...  
Keyword(s):  
Rotational Speed ◽  
Diagnostic Algorithm ◽  
Speed Measurement ◽  
Fault Diagnostic ◽  
Speed Fluctuations

Vibration isolation with clutch disk pre-damper mechanism for the idle rattle phenomenon

2016 ◽  
Vol 24 (8) ◽  
pp. 1518-1534 ◽  
Author(s):  
Alişan Yüceşan ◽  
Semih Sezer
Keyword(s):  
Engine Speed ◽  
Vibration Isolation ◽  
Test Bench ◽  
Time Varying ◽  
Mesh Stiffness ◽  
Gear Mesh ◽  
Speed Measurement ◽  
Proposed Model ◽  
Speed Fluctuations ◽  
Gear Mesh Stiffness

In this paper, the influence of clutch disk pre-damper mechanism constituents on the idle rattle phenomenon was investigated with an analytical model containing a new time-varying gear mesh stiffness function. Comparing experimental results to simulation results for the same excitation input was the key implementation for the validation of proposed model. The engine speed fluctuations represented in the simulation was imported from a speed measurement of a diesel engine in the test bench.

scholarly journals SENSORLESS SPEED CONTROL OF THE DIRECT CURRENT MOTORS

2021 ◽  
Vol 2021 (58) ◽  
pp. 23-29
Author(s):  
S. Peresada ◽  
◽  
Y. Nikonenko ◽  
V. Pyzhov ◽  
D. Rodkin ◽  
...  
Keyword(s):  
Control Algorithm ◽  
Dynamic Performance ◽  
Speed Control ◽  
Angular Speed ◽  
Observer Design ◽  
Loop Current ◽  
Speed Sensor ◽  
Speed Regulation ◽  
Speed Measurement ◽  
Measurement Design

In this paper, a new speed control algorithm for a permanent magnet DC motor which does not require implementation of the angular speed sensor is presented. Three steps are performed to develop the control system: design of speed tracking control algorithm assuming the speed measurement; design of speed observer; design of sensorless speed control algorithm based on the principle of separation. Information about speed is taken from the speed observer using the motor current value. The stability of the composite system dynamics consisting of three subsystems (the speed regulation loop, current regulation loop, and speed observer) is analyzed. The feedback gains tuning procedure for decoupling of three subsystems is given. The simulation results show that the dynamic performance of the designed system is similar to the performance of the system with angular speed measurement. The resulting closed-loop system has structural robustness properties with respect to parametric and coordinate disturbances. References 12, figures 2.

Combustion Engine Performance Diagnostics by Kinetic Energy Measurement

1990 ◽  
Vol 112 (3) ◽  
pp. 301-307 ◽  
Author(s):  
G. F. Mauer ◽  
R. J. Watts
Keyword(s):  
Kinetic Energy ◽  
Internal Combustion Engines ◽  
Combustion Engine ◽  
High Reliability ◽  
Engine Performance ◽  
Diagnostic Technique ◽  
Digital Circuit ◽  
Angular Speed ◽  
Drive Train ◽  
Front End

The diagnostic technique described in this paper is based on measuring the instantaneous angular speed of both the front end and the flywheel on internal-combustion engines, recording more than 400 speed measurements per engine cycle. Two noncontacting transducers are added to an existing drive train without requiring drive train modifications. A digital circuit, which includes a microprocessor, samples and processes the raw speed data. The numerical analysis includes data noise filtering, and the numerical determination of front end and flywheel speed waveforms. When operating without external load, the engine accelerates only the inertial load. When neglecting friction and the small amount of torsional energy in the crankshaft, it is shown that the engine energy can be modeled as a lumped parameter system consisting of inertia on both engine front and flywheel ends, coupled by a torsional spring. The results from measurements on an eight-cylinder diesel engine with various cylinder faults show that reduced cylinder performance produces a drop of kinetic energy for the faulty cylinder. An engine performance criterion evaluates the performance of each cylinder, based on its contribution to total engine kinetic energy. The results demonstrate that fault conditions are detected with high reliability.

Sign in / Sign up

Export Citation Format

Share Document