Machinery Mault Diagnosis and Correction
Transfer function for machinery malfunction diagnosis and correction
Predictive maintenance is a type of condition-based maintenance that utilizes diagnostics and prognostics to determine a system's condition. The purpose of predictive maintenance is to minimize the likelihood of a machine failing and improve production efficiency. Unlike traditional preventive maintenance, condition-based maintenance uses the condition of machinery to guide maintenance activities.
Principles of rotor dynamics
Principles of rotor dynamics have an important role to play in the diagnosis and correction of machinery faults. They can be used to predict the vibration response of a rotor due to a misalignment. In addition, they can also be used in designing machinery.
The field of rotor dynamics is in constant demand. With the increase in demand in power generation and transportation, there is a need for ever-higher reliability. Modern materials and engineering advances have enabled faster, lighter, and more reliable rotating machinery. These machines are also expected to work for longer periods of time. This makes rotor-dynamic fault diagnosis and correction an important topic in the field of engineering.
Several studies have addressed the issue of rotor unbalance and how this affects machine performance. For example, Salamone and Gunter (1980) investigated the unbalance response of a rotor with a skewed disk, which introduces gyroscopic moments and angular motion. Their simulations showed good agreement with previous findings. For instance, they found that at the first critical speed, the effects of the disk warp and shaft bow were almost equal and the skewed disk had the largest effect.
For a wide variety of rotor types, it has been possible to use a mathematical model to determine rotor-balance based on nonlinear dynamics. Using this method, a mechanical engineer can determine the unbalance distribution of a rotor based on a variety of system parameters, including the frequency and phase of vibration.
Measurement of vibration
The measurement of vibration is a key element in machinery malfunction diagnosis and correction. There are two basic methods for assessing vibration in a rotating machinery system. One method relies on the measurement of the frequency, or amplitude, of the motion. This method is useful for identifying potential causes of vibration, such as a faulty bearing. The other method uses the phase of the vibration signal to identify resonance and dynamic balance problems.
Vibration is a common phenomenon in rotating machinery, and is caused by friction and centrifugal forces. Vibrations can be measured, trended, and recorded. They can also be heard. Vibration is a recurring motion around a point of equilibrium. Its amplitude and frequency are used in countless calculations for analyzing the cause of vibration in machinery.
Data-driven methods are more commonly used for analyzing vibration data in machines than model-based methods. These methods are less expensive and can be used by inexperienced users. A systematic review of vibration analysis techniques identifies four major approaches: data acquisition, data processing, feature extraction, and fault recognition.
Vibration measurements are useful for condition monitoring and fault diagnosis in rotating machines. To collect and analyze vibration data, a vibration measurement system must include sensors, signal conditioning, and data acquisition software. The data acquisition system must be fast enough to capture the desired frequency range and be synchronized with the rotating mechanism. In addition, analysis software must be able to process the data collected.
