Stroke measuring system of high-frequency reciprocating testing machine

Abstract

According to the stroke measuring system of the high-frequency reciprocating testing machine, a testing mechanism of the high-frequency reciprocating testing machine comprises a heating groove, an oil groove is formed in the heating groove, a testing piece is arranged in the oil groove, a testing ball is arranged on the testing piece, the testing ball is fixed in a vertical clamp, and a load is applied above the testing ball to roll along the upper end of the testing piece; an excitation mechanism of the high-frequency reciprocating tester drives a test ball to do horizontal reciprocating motion, the laser vibration meter comprises a laser head and a controller, the orientation of the laser head is consistent with the reciprocating motion direction of the excitation mechanism, the laser head is in communication connection with the controller, the controller is provided with a high-frequency signal processing module, and the controller is in communication connection with a data acquisition and analysis system. The data acquisition and analysis system is in communication connection with the upper computer; the laser Doppler frequency shift effect is utilized, non-contact measurement of displacement, speed and acceleration of a moving object is achieved, stroke parameters obtained through measurement can be traced to the national standard, the magnitude accuracy and traceability of the diesel oil lubricating performance are achieved, and quality control of the petrochemical industry is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of diesel performance detection, in particular to a stroke measurement system for a high-frequency reciprocating testing machine. Background Art

[0002] The high-frequency reciprocating testing machine for fuel lubricity is mainly used for detecting the lubricity of diesel fuel and can also be used for testing the lubricity of gasoline. The quality of lubricity directly affects the wear degree and fitting precision of precision components of a fuel engine, and thus affects the normal operation of the machine. The accuracy of the measured values of the test parameters of the reciprocating testing machine is of great practical significance for improving fuel efficiency and reducing carbon emissions.

[0003] The high-frequency reciprocating testing machine for fuel lubricity usually uses a test ball to reciprocate in an oil sump at a set frequency and stroke, and uses the wear scar diameter generated on the test ball to evaluate the lubricity of the sample diesel fuel. For the high-tech requirement of 1.0 mm ± 0.02 mm for the vibration stroke, the previous verification method was to use a calibrated microscope to calibrate the stroke parameters by measuring the wear mark lengths on the test pieces after testing with two lubricity reference oils of high and low levels. The actual stroke was obtained by subtracting the average width of the wear mark from the length of the wear mark.

[0004] However, the HFRR value (WSD) and expanded uncertainty of the reference oil are determined by cyclic comparison among multiple laboratories. The quality of the reference oil seriously affects the calibration accuracy of the stroke parameters. Moreover, when calibrating the stroke with the reference oil, it is necessary to repeat the measurement of the high and low lubricity reference oils at least twice according to the test condition of 75 minutes to evaluate the precision index requirements, and the metrology is very time-consuming. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a stroke measurement system for a high-frequency reciprocating testing machine.

[0006] In order to achieve the above purpose, the technical solution of the utility model is as follows:

[0007] A stroke measurement system for a high-frequency reciprocating testing machine, characterized by comprising a test mechanism of the high-frequency reciprocating testing machine, an excitation mechanism of the high-frequency reciprocating testing machine, a laser vibrometer, and a data acquisition and analysis system.

[0008] The test mechanism of the high-frequency reciprocating testing machine includes a heating tank, an oil sump is arranged in the heating tank, a test piece is arranged inside the oil sump, a test ball is arranged above the test piece, the test ball is fixed in a vertical fixture, a load is applied inside the vertical fixture above the test ball, the test ball rolls along the upper end of the test piece, and the excitation mechanism of the high-frequency reciprocating testing machine drives the vertical fixture, the load, and the test ball to reciprocate horizontally.

[0009] The laser vibrometer includes a laser head and a controller. The orientation of the laser head is consistent with the reciprocating direction of the excitation mechanism of the high-frequency reciprocating testing machine. The signal output end of the laser head is communicatively connected to the signal input end of the controller. The controller is provided with a high-frequency signal processing module. The signal output end of the controller is communicatively connected to the signal input end of the data acquisition and analysis system. The data acquisition and analysis system is provided with an analog-to-digital converter. The signal output end of the data acquisition and analysis system is communicatively connected to a host computer.

[0010] Further, the high-frequency signal processing module includes a first velocity decoder, a second velocity decoder, and a displacement decoder. The first velocity decoder, the second velocity decoder, the displacement decoder, and the auxiliary decoder receive the Doppler signal of the laser head.

[0011] Further, the first velocity decoder and the second velocity decoder are analog decoders. The first velocity decoder and the second velocity decoder output analog velocity signals through analog filters.

[0012] Further, the second velocity decoder and the displacement decoder are digital decoders. The second velocity decoder and the displacement decoder output digital velocity signals through a DSP filter. The second velocity decoder and the displacement decoder output digital electrical signals and digital optical signals through a digital audio interface.

[0013] Further, the displacement decoder is an analog decoder. The displacement decoder outputs an analog displacement signal.

[0014] Further, the high-frequency signal processing module further includes an auxiliary decoder. The auxiliary decoder is a velocity decoder or a displacement decoder. The auxiliary decoder outputs an analog velocity signal or an analog displacement signal.

[0015] Further, the data acquisition and analysis system includes an anti-aliasing filter, an analog-to-digital converter, and a digital signal processor. The anti-aliasing filter inputs an analog signal. The signal output end of the anti-aliasing filter is communicatively connected to the analog-to-digital converter. The analog-to-digital converter outputs a digital signal. The signal output end of the analog-to-digital converter is communicatively connected to the digital signal processor.

[0016] The utility model utilizes the laser Doppler frequency shift effect to realize non-contact measurement of the displacement, velocity, and acceleration of a moving object. The measured stroke parameters can be traced back to the national standard according to the JJG2054—2015 National Metrological Verification System for Vibration Measuring Instruments, realizing the accuracy and traceability of the measured value of diesel lubricating performance and improving the quality control of the petrochemical industry. Description of the Drawings

[0017] Figure 1 It is a schematic structural diagram of the utility model;

[0018] Figure 2 This is the signal demodulation flowchart of the laser vibration measuring instrument controller of the present utility model;

[0019] Figure 3 This is the flowchart of the data acquisition and analysis system of the present utility model;

[0020] Figure 4 This is the test interface diagram of the spectrum analysis software.

[0021] Reference numerals:

[0022] 1 Test mechanism of high-frequency reciprocating testing machine, 2 Excitation mechanism of high-frequency reciprocating testing machine, 3 Laser head, 4 Controller,

[0023] 5 Data acquisition and analysis system, 6 Host computer,

[0024] 11 Heating tank, 12 Oil tank, 13 Test piece, 14 Test ball, 15 Vertical fixture, 16 Load,

[0025] 41 First speed decoder, 42 Second speed decoder, 43 Analog filter, 44 DSP filter,

[0026] 45 Digital audio interface, 46 Displacement decoder, 47 Auxiliary decoder,

[0027] 51 Anti-aliasing filter, 52 Analog-to-digital converter, 53 Digital signal processor. Detailed implementation manners

[0028] Next, the technical solution of the present utility model will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0029] The present utility model discloses a stroke measurement system for a high-frequency reciprocating testing machine, as Figure 1 shown, which includes a test mechanism 1 of a high-frequency reciprocating testing machine, an excitation mechanism 2 (i.e., a vibrator) of a high-frequency reciprocating testing machine, a laser vibration measuring instrument, and a data acquisition and analysis system 5.

[0030] The test mechanism 1 of the high-frequency reciprocating testing machine includes a heating tank 11. An oil tank 12 is arranged inside the heating tank 11. A test piece 13 is arranged inside the oil tank 12. A test ball 14 is arranged above the test piece 13. The test ball 14 is fixed in a vertical fixture 15. A load 16 is applied inside the vertical fixture 15 above the test ball 14. The test ball 14 rolls along the upper end of the test piece 13. The excitation mechanism 2 of the high-frequency reciprocating testing machine drives the vertical fixture 15, the load 16, and the test ball 14 to perform horizontal reciprocating motion.

[0031] The laser vibrometer includes a laser head 3 and a controller 4. The orientation of the laser head 3 is consistent with the reciprocating direction of the excitation mechanism 2 of the high-frequency reciprocating testing machine. The signal output end of the laser head 3 is communicatively connected to the signal input end of the controller 4. The controller 4 is provided with a high-frequency signal processing module. The signal output end of the controller 4 is communicatively connected to the signal input end of the data acquisition and analysis system 5. The data acquisition and analysis system 5 is provided with an analog-to-digital converter 52. The signal output end of the data acquisition and analysis system 5 is communicatively connected to the upper computer 6.

[0032] The controller 4 has a built-in decoder slot, and the decoder slot includes a speed decoder slot and a displacement decoder 46 slot.

[0033] The laser vibrometer utilizes the laser Doppler frequency shift effect to achieve non-contact measurement of the displacement, speed, and acceleration of a moving object. According to the type of decoder, the output original signal is an analog / digital speed value / displacement value. The signal demodulation process of its controller 4 is shown in Figure 2 .

[0034] To avoid the errors introduced by numerical integration, it is preferred to use a digital displacement decoder 46, and the output original digital signal is a displacement signal. In this embodiment, the high-frequency signal processing module includes a first speed decoder 41, a second speed decoder 42, and a displacement decoder 46. The first speed decoder 41, the second speed decoder 42, the displacement decoder 46, and the auxiliary decoder 47 receive the Doppler signal of the laser head 3. Both the second speed decoder 42 and the displacement decoder 46 are digital decoders. The second speed decoder 42 and the displacement decoder 46 output digital speed signals through the DSP filter 44. The second speed decoder 42 and the displacement decoder 46 output digital electrical signals and digital optical signals through the digital audio interface 45.

[0035] In another embodiment, the first speed decoder 41 and the second speed decoder 42 are analog decoders, and the first speed decoder 41 and the second speed decoder 42 output analog speed signals through the analog filter 43.

[0036] In another embodiment, the displacement decoder 46 is an analog decoder, and an analog displacement signal is output by the displacement decoder 46.

[0037] The high-frequency signal processing module further includes an auxiliary decoder 47. The auxiliary decoder 47 can be a speed decoder or a displacement decoder 46, and an analog speed signal or an analog displacement signal is output by the auxiliary decoder 47.

[0038] As Figure 3As shown in the figure, the data acquisition and analysis system 5 includes an anti-aliasing filter 51, an analog-to-digital converter 52, and a digital signal processor 53. An analog signal f(t) is input to the signal input end of the anti-aliasing filter 51. The signal output end of the anti-aliasing filter 51 is communicatively connected to the signal input end of the analog-to-digital converter 52. The digital signal f(n) is output from the signal output end of the analog-to-digital converter 52. The signal output end of the analog-to-digital converter 52 is communicatively connected to the signal input end of the digital signal processor 53. The digital signal x(n) is output from the signal output end of the digital signal processor 53.

[0039] The measurement method using the system of the present utility model includes the following steps:

[0040] Step S1) Select an appropriate displacement sensitivity measurement gear on the controller 4;

[0041] Step S2) Adjust the beam emitted by the laser head 3 so that it is consistent with the reciprocating motion direction of the excitation mechanism 2 of the high-frequency reciprocating testing machine;

[0042] Step S3) Set the test frequency and vibration amplitude of the excitation mechanism 2 of the high-frequency reciprocating testing machine and start the test;

[0043] Step S4) After the high-frequency reciprocating testing machine 1 runs stably, turn on the data acquisition and analysis system 5 to collect and record data;

[0044] Step S5) The spectrum analysis software of the upper computer 6 records the time-domain signal in real time and analyzes the vibration frequency and vibration amplitude in the frequency domain, and performs real-time FFT spectrum analysis. See Figure 4 .

[0045] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present utility model, rather than to limit them; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present utility model.

Claims

1. A high-frequency reciprocating testing machine stroke measurement system, characterized in that: It includes a high-frequency reciprocating test machine test mechanism, a high-frequency reciprocating test machine excitation mechanism, a laser vibrometer and a data acquisition and analysis system. The testing mechanism of the high-frequency reciprocating testing machine includes a heating tank, an oil tank is provided in the heating tank, a test piece is provided inside the oil tank, a test ball is provided above the test piece, the test ball is fixed in a vertical fixture, a load is applied above the test ball in the vertical fixture, the test ball rolls along the upper end of the test piece, and the excitation mechanism of the high-frequency reciprocating testing machine drives the vertical fixture, the load and the test ball to reciprocate horizontally. The laser vibrometer includes a laser head and a controller. The orientation of the laser head is consistent with the direction of reciprocating motion of the excitation mechanism of the high-frequency reciprocating testing machine. The signal output end of the laser head is communicatively connected to the signal input end of the controller. The controller is provided with a high-frequency signal processing module. The signal output end of the controller is communicatively connected to the signal input end of the data acquisition and analysis system. The data acquisition and analysis system is provided with an analog-to-digital converter. The signal output end of the data acquisition and analysis system is communicatively connected to the host computer.

2. The high-frequency reciprocating testing machine stroke measurement system according to claim 1, characterized in that: The high-frequency signal processing module includes a first speed decoder, a second speed decoder and a displacement decoder, and the first speed decoder, the second speed decoder, the displacement decoder and the auxiliary decoder receive the Doppler signal of the laser head.

3. The high-frequency reciprocating testing machine stroke measurement system according to claim 2, characterized in that: The first speed decoder and the second speed decoder are analog decoders, and the first speed decoder and the second speed decoder output analog speed signals through analog filters.

4. The high-frequency reciprocating testing machine stroke measurement system according to claim 2, characterized in that: The second speed decoder and displacement decoder are digital decoders, the second speed decoder and displacement decoder output digital speed signals through a DSP filter, and the second speed decoder and displacement decoder output digital electrical signals and digital optical signals through a digital audio interface.

5. The high-frequency reciprocating testing machine stroke measurement system according to claim 2, characterized in that: The displacement decoder is an analog decoder, and the displacement decoder outputs an analog displacement signal.

6. The high-frequency reciprocating testing machine stroke measurement system according to claim 2, characterized in that: The high-frequency signal processing module further includes an auxiliary decoder, which is a speed decoder or a displacement decoder, and the auxiliary decoder outputs an analog speed signal or an analog displacement signal.

7. The high-frequency reciprocating testing machine stroke measurement system according to claim 1, characterized in that: The data acquisition and analysis system includes an anti-aliasing filter, an analog-to-digital converter and a digital signal processor. The anti-aliasing filter inputs an analog signal, the signal output end of the anti-aliasing filter is communicatively connected to the analog-to-digital converter, the analog-to-digital converter outputs a digital signal, and the signal output end of the analog-to-digital converter is communicatively connected to the digital signal processor.

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