National Instruments Order Analysis Toolset - Manuals

© National Instruments Corporation vii LabVIEW Order Analysis Toolset User Manual About This Manual This manual provides information about the LabVIEW Order Analysis Toolset, including system requirements, installation, and suggestions for getting started with order analysis and the toolset. The man...

About This Manual LabVIEW Order Analysis Toolset User Manual viii ni.com bold Bold text denotes items that you must select or click in the software, such as menu items and dialog box options. Bold text also denotes the names of parameters, dialog boxes, sections of dialog boxes, windows, menus, pale...

© National Instruments Corporation 1-1 LabVIEW Order Analysis Toolset User Manual 1 Introduction to the LabVIEW Order Analysis Toolset This chapter introduces the LabVIEW Order Analysis Toolset and the Order Analysis Start-Up Kit, outlines system requirements, and gives installation instructions. Ov...

Chapter 1 Introduction to the LabVIEW Order Analysis Toolset © National Instruments Corporation 1-3 LabVIEW Order Analysis Toolset User Manual System Requirements You must have LabVIEW 6.1 or later Full Development System or Professional Development System installed to run the LabVIEW Order Analysis...

Chapter 1 Introduction to the LabVIEW Order Analysis Toolset LabVIEW Order Analysis Toolset User Manual 1-4 ni.com Example VIs If you have experience with order analysis, the example VIs, located in the examples\Order Analysis directory, can help you learn how to use the LabVIEW Order Analysis Tools...

Chapter 1 Introduction to the LabVIEW Order Analysis Toolset © National Instruments Corporation 1-5 LabVIEW Order Analysis Toolset User Manual set to DAQ and you click the Run button on the front panel of the example VI, one of the following VIs opens: • Acquire Data (Analog Tach) VI • Acquire Data ...

Chapter 1 Introduction to the LabVIEW Order Analysis Toolset LabVIEW Order Analysis Toolset User Manual 1-6 ni.com tachometer signal and S&V for the sound or vibration sensor. After choosing data acquisition settings, enter the number of pulses you want the tachometer to generate per revolution ...

Chapter 1 Introduction to the LabVIEW Order Analysis Toolset © National Instruments Corporation 1-7 LabVIEW Order Analysis Toolset User Manual Figure 1-3. Acquire Data with PXI 4472 and TIO VI Configuration Tab Use the Configuration tab of the Acquire Data with PXI 4472 and TIO VI, shown in Figure 1...

Chapter 1 Introduction to the LabVIEW Order Analysis Toolset LabVIEW Order Analysis Toolset User Manual 1-8 ni.com Figure 1-4. Acquire Data with PXI 4472 and TIO VI Acquisition Tab The Acquisition tab, shown in Figure 1-4, allows you to acquire and observe data. Click the Acquire button to acquire d...

© National Instruments Corporation 2-1 LabVIEW Order Analysis Toolset User Manual 2 Order Analysis This chapter gives brief descriptions of the need for order analysis, the basic concepts of order analysis, the effect of rotational speed on order identification, and the different order analysis meth...

Chapter 2 Order Analysis LabVIEW Order Analysis Toolset User Manual 2-2 ni.com vibration signals. The frequency-domain representations of noise and vibration behave as harmonics of the machine rotational speed. In many industries, the harmonics related to the rotational speed are referred to as orde...

Chapter 2 Order Analysis © National Instruments Corporation 2-3 LabVIEW Order Analysis Toolset User Manual Assuming that speed remains constant during data acquisition, you can use the following equations to switch between the frequency domain and the order domain. Orders often reflect the physical ...

Chapter 2 Order Analysis LabVIEW Order Analysis Toolset User Manual 2-4 ni.com Like classical harmonic analysis, order analysis is a powerful tool for gaining a better understanding of the condition of rotating machinery. However, compared to harmonic analysis, order analysis is more effective for t...

Chapter 2 Order Analysis LabVIEW Order Analysis Toolset User Manual 2-6 ni.com Variable Rotational Speed In addition to testing rotating machinery running at a constant speed, researchers often perform tests involving run-up and run-down. Like a swept-sine stimulus, testing run-up and run-down provi...

Chapter 2 Order Analysis © National Instruments Corporation 2-9 LabVIEW Order Analysis Toolset User Manual orders overlap, you are unable to derive meaningful information about the individual orders. Harmonic Analysis Harmonic analysis is suitable for the analysis of rotating machinery only when the...

Chapter 2 Order Analysis LabVIEW Order Analysis Toolset User Manual 2-10 ni.com Currently, the following methods generally are used to perform order analysis: • Gabor transform • Resampling • Adaptive filter The LabVIEW Order Analysis Toolset provides the Gabor-transform-based method and the resampl...

Chapter 2 Order Analysis LabVIEW Order Analysis Toolset User Manual 2-12 ni.com Figure 2-8 shows two examples of padding. Figure 2-8. Padding Examples Refer to Appendix A, Gabor Expansion and Gabor Transform , for more information about the Gabor transform and the Gabor expansion. Refer to Chapter 3...

Chapter 2 Order Analysis © National Instruments Corporation 2-13 LabVIEW Order Analysis Toolset User Manual Resampling Resampling is a widely used method of order analysis. Figure 2-9 illustrates the resampling method. Figure 2-9. Resampling In the resampling method, time-samples are converted to an...

Chapter 2 Order Analysis LabVIEW Order Analysis Toolset User Manual 2-14 ni.com After acquiring angle samples with either hardware or software, you can perform a Fourier transform on the angle samples to analyze them. Because the time domain has changed into the angle domain, the frequency domain no...

Chapter 2 Order Analysis © National Instruments Corporation 2-15 LabVIEW Order Analysis Toolset User Manual After the resampling process takes place, recovering a time waveform at a specific order might be difficult. Refer to Chapter 4, Resampling-Based Order Analysis , for information about how the...

© National Instruments Corporation 3-1 LabVIEW Order Analysis Toolset User Manual 3 Gabor Transform-Based Order Tracking This chapter discusses a new order analysis method based on the Gabor transform and provided by the LabVIEW Order Analysis Toolset that enables you to complete the following tasks...

Chapter 3 Gabor Transform-Based Order Tracking © National Instruments Corporation 3-3 LabVIEW Order Analysis Toolset User Manual Complete the following steps to perform Gabor order analysis. 1. Acquire data samples from the tachometer and noise or vibration sensors synchronously at some constant sam...

Chapter 3 Gabor Transform-Based Order Tracking LabVIEW Order Analysis Toolset User Manual 3-4 ni.com processed by a Gabor transform, the index of the n th order is given by the following equation. , where RPM is the averaged instantaneous rotational speed in the time interval, N is the number of fre...

Chapter 3 Gabor Transform-Based Order Tracking © National Instruments Corporation 3-5 LabVIEW Order Analysis Toolset User Manual Figure 3-3(b) illustrates constant order bandwidth. The neighborhood is considered as the region between and . While the frequency bandwidth varies in time, the order band...

Chapter 3 Gabor Transform-Based Order Tracking LabVIEW Order Analysis Toolset User Manual 3-6 ni.com VI to perform the mask operation. Refer to the LabVIEW Order Analysis Toolset Help for information about the Template to Mask VI. You can consider the mask operation a time-variant bandpass filter in...

Chapter 3 Gabor Transform-Based Order Tracking © National Instruments Corporation 3-7 LabVIEW Order Analysis Toolset User Manual Figure 3-4(b) shows a mask array around the fourth order with a constant frequency bandwidth. The TRUE values comprise the white area, while the FALSE values comprise the ...

Chapter 3 Gabor Transform-Based Order Tracking LabVIEW Order Analysis Toolset User Manual 3-8 ni.com time-variant filters. Figure 3-6 shows an original signal and the spectrum of the reconstructed signal. Figure 3-6. Spectrum of Reconstructed Signal In Figure 3-6, one row is selected from the joint ...

Chapter 3 Gabor Transform-Based Order Tracking LabVIEW Order Analysis Toolset User Manual 3-10 ni.com Figure 3-7(c) shows the frequency-rpm spectral map. The horizontal axis represents rpm, or rotational speed. You can map the rpm axis from the time axis in the frequency-time spectral map by the rpm...

© National Instruments Corporation 4-1 LabVIEW Order Analysis Toolset User Manual 4 Resampling-Based Order Analysis This chapter describes the resampling method provided by the LabVIEW Order Analysis Toolset, determining the time instance for resampling, resampling vibration data, and slow roll comp...

Chapter 4 Resampling-Based Order Analysis LabVIEW Order Analysis Toolset User Manual 4-2 ni.com Complete the following steps to perform resampling-based order analysis. 1. Acquire data samples from tachometer and noise or vibration sensors synchronously at some constant sample rate. 2. Use the LabVI...

Chapter 4 Resampling-Based Order Analysis © National Instruments Corporation 4-3 LabVIEW Order Analysis Toolset User Manual a larger margin of samples for analysis and need to resample 2.5 K samples in one revolution. Most of the time, a tachometer does not produce enough pulses in one revolution. T...

Chapter 4 Resampling-Based Order Analysis LabVIEW Order Analysis Toolset User Manual 4-4 ni.com Figure 4-2. Original Time Sequence and CIC Interpolation Filter with an Interpolation Factor of Eight Resampling Vibration Data The resampling operation converts a vibration signal from the time domain in...

Chapter 4 Resampling-Based Order Analysis © National Instruments Corporation 4-5 LabVIEW Order Analysis Toolset User Manual According to the Nyquist sampling theorem, you can exactly reconstruct the time signal x ( t ) from samples x ( nT s ) with the following equation. (4-1) where h s is a sinc fu...

© National Instruments Corporation 5-1 LabVIEW Order Analysis Toolset User Manual 5 Calculating Rotational Speed This chapter describes the digital differentiator method used by the LabVIEW Order Analysis Toolset to calculate rotational speed and describes averaging pulses to smooth noisy calculated...

Chapter 5 Calculating Rotational Speed LabVIEW Order Analysis Toolset User Manual 5-2 ni.com Figure 5-1. Tachometer Signal and Rotation Angle The arrival time t k of the pulses P ( k ) in the tachometer signal correspond to the cumulative rotation angle θ ( t k ). The cumulative rotation angle funct...

Chapter 5 Calculating Rotational Speed © National Instruments Corporation 5-3 LabVIEW Order Analysis Toolset User Manual of an equally spaced sequence requires fewer computations than calculating the first derivative of an unequally spaced sequence. For the evenly separated function series t k , you...

© National Instruments Corporation A-1 LabVIEW Order Analysis Toolset User Manual A Gabor Expansion and Gabor Transform This appendix presents an overview of the Gabor expansion and the Gabor transform methods used in the LabVIEW Order Analysis Toolset. This appendix also describes application issue...

Appendix A Gabor Expansion and Gabor Transform LabVIEW Order Analysis Toolset User Manual A-2 ni.com The sampled STFT is also known as the Gabor transform and is represented by the following equation. (A-2) where ∆ M represents the time sampling interval and N represents the total number of frequenc...

Appendix A Gabor Expansion and Gabor Transform © National Instruments Corporation A-3 LabVIEW Order Analysis Toolset User Manual corresponding dual window function from ∆ M independent linear systems with the following equation. (A-4) where L denotes the window length. denotes a periodic auxiliary f...

Appendix A Gabor Expansion and Gabor Transform LabVIEW Order Analysis Toolset User Manual A-4 ni.com Discrete Gabor-Expansion-Based Time-Varying Filter Initially, discrete Gabor expansion seems to provide a feasible method for converting an arbitrary signal from the time domain into the joint time-f...

Appendix A Gabor Expansion and Gabor Transform © National Instruments Corporation A-5 LabVIEW Order Analysis Toolset User Manual 4. Compute the new Gabor coefficients after you obtain the time waveform. 5. Repeat steps 1 through 4 until the time waveforms converge. Without a loss of generality, rewr...

Appendix A Gabor Expansion and Gabor Transform LabVIEW Order Analysis Toolset User Manual A-6 ni.com C k and converge. with . For with , the support of C k in the time-frequency domain is inside the masked area if and only if the following equation is true. (A-6) for 0 ≤ k < N and 0 ≤ m < . Tw...

© National Instruments Corporation B-1 LabVIEW Order Analysis Toolset User Manual B References This appendix lists the reference material used for the LabVIEW Order Analysis Toolset. • Albright, Michael, and Shie Qian. Comparison of the New Proposed Gabor Order Tracking Technique vs. Other Order Tra...

© National Instruments Corporation G-1 LabVIEW Order Analysis Toolset User Manual Glossary Numbers/Symbols Infinity. 2D Two-dimensional. A adaptive filter A type of filter that operates on a recursive algorithm to achieve the goal of optimum. It is self-designing and suitable for tracking time varia...

© National Instruments Corporation I-1 LabVIEW Order Analysis Toolset User Manual Index A adaptive filter, 2-15analysis of rotating machinery, using the toolset, 1-2 applying an iteration to reconstruct a time waveform, A-4 C calculating rotational speed, 5-1 averaging pulses, 5-3digital differentia...

Index LabVIEW Order Analysis Toolset User Manual I-2 ni.com K KnowledgeBase, C-1 M masking, 3-5 extracting orders, 3-6reconstructing a signal, 3-7 N National Instruments customer education, C-1professional services, C-1system integration services, C-1technical support, C-1worldwide offices, C-1 O on...