As described, the ambient vibration test above three instrument are necessary for the transcription of vibration, for storage of data and analysis of signal for the dynamic parameters. In this dissertation work following instrument is used for the test are described below. 188.8.131.52.1 DATA ACQUISITION SYSTEM It is process in which the analog data from the sensing device is converted into digital data and stored permanently. For this purpose data logger and computer is
4.1. The parameters selected for this converter to operate in the CCM are as follows: Input inductor Li = 2.5 mH, output inductor Lo = 4.3 mH, intermediate capacitor C1 = 0.66 μF, and dc-link capacitor Cd = 2200 μF. Fig.5.1 shows the performance of the proposed BLDC motor drive fed by a PFC Cuk converter operating in the CCM. Fig. 8 shows the steady-state performance demonstrating the associated waveforms for 3 cycles of line frequency.
OVERVIEW OF ECG ANALYSIS SYSYEM In order to extract the information hidden in the ECG signal many types of transformations can be adopted and because of the quasi periodic nature of the non stationary ECG signals transformation is done using the DWT. The ECG signal that is non stationary has P, QRS complex and T waves. The duration of each of the waves signifies the electrical activity of the heart. P wave indicates the atrial contraction or depolarization. PR interval indicates the time duration for the travel of the depolarization wave from the atria to the ventricles.
A pressure sensor is used to convert a physical phenomenon of force into a measurable electrical signal typically a voltage or current signal. DAQ card NI9219 is used which acts as the interface between the computer and the force measurement device i.e pressure sensor. Its primary function is to digitize the incoming analog signals so that the computer can interpret them. The recorded raw signal is most often affected by noise and artifacts. Processing that contaminated signal will give false information which may lead to incorrect results.
These signals travel through a medium in the body and after striking with various tissues, return back to the transducer. Then the returned signals are processed and displayed on the screen, as either a real image or different artefacts. Using an ultrasound, this is a simplified way of understanding an image acquisition. In the following text, the principles of ultrasound generation from a piezoelectric crystal and physical properties governing image creation are discussed, with appropriate
Potentiostat Poteniostat is one the device it is widely used in the electrochemical studies and makes possible the performance of techniques such as cyclic voltammetry.The main principal of poteniostat to control potential and the measured current visa versa. The conventional three-electrode potentiostat is connected to the working, reference and auxiliary electrodes immersed in the test solution placed in the cell. It controls the potential of the working electrode (WE), with respect to the reference electrode (RE) while simultaneously measuring the current flowing between the WE and the auxiliary electrode (AE) (Fig 2.1). The potentiostat performs three functions: i. Controls the applied potential, which is potential difference between the WE and RE (the applied potential controls what half reactions occur at the WE); ii.
1 and 21 highlights the nonlinear static pushover analysis. It is an efficient method for the performance evaluation of a structure subjected to seismic loads. Also ATC40 covers step by step procedures for pushover analysis to determine the capacity curve, capacity spectrum method and displacement coefficient method were briefly elaborated. By using these procedures this report is detailed with modeling aspects of the hinge behavior, acceptance criteria and locate the performance point. Hence, ATC40 serves as guideline for the starting of seismic evaluation process.
ON-ROAD TESTING OF A VEHICLE FOR GEARBOX FAULT DETECTION USING VIBRATION SIGNALS ABSTRACT Gearbox is one of the most important components in an automobile, enabling power transmission from the engine to the wheels. Gears and bearings are prone to failure. The impending case of failure can be predicted by performing vibration analysis of a gear box, usually done by acquiring data in lab conditions. This paper deals with the condition monitoring of a gearbox in real time test conditions. The information from the data is extracted in the form of statistical features from the normalized raw data.
Ensure the health of pipe in-line service inspection is one of the problems. Non-Destructive Testing (NDT) methods used for identify defects, they each one having advantages and disadvantages making it more or less appropriate for a given application. Some of NDT methods are radiography,
Measuring of noise is an important part in noise control. The main objective of noise measurement is to make accurate measurement which give us a purposeful act of comparing noises under different conditions for assessment of adverse impacts of noise and adopting suitable control techniques for noise reduction. There are many equipment use in noise measurements and Sound Level Meter is the most commonly using equipment in research field following diagram shows the basic components of a sound level meter. A sound level meter consists basically of a microphone and an electronic circuit including an attenuator, amplifier, weighting networks or filters and a display unit. The microphone converts the sound signal to an equivalent electrical signal.