CN111811815B - System and method for testing natural frequency of torsional vibration reduction belt pulley - Google Patents
System and method for testing natural frequency of torsional vibration reduction belt pulley Download PDFInfo
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Abstract
The invention discloses a system and a method for testing natural frequency of a torsional vibration damping belt pulley. The invention utilizes the driving device to do variable speed movement under the full load working condition to drive the torsion vibration damping belt pulley to continuously rotate, so that the self torsion vibration of the driving device realizes the sweep frequency excitation of the torsion vibration damping belt pulley, avoids the influence of the excitation amplitude on the test result, and eliminates the influence of the rubber material damping on the test result in principle through further signal processing, thereby accurately obtaining the natural frequency of the torsion vibration damping belt pulley.
Description
Technical Field
The invention belongs to the field of automobile part testing, and particularly relates to a system and a method for testing natural frequency of a torsional vibration damping belt pulley.
Background
When an engine runs, a crankshaft system generates torsional vibration (torsional vibration for short) and bending vibration, and the torsional vibration of the crankshaft is too large, so that the problem of vibration noise of an automobile is easily caused, and even the crankshaft is broken. Therefore, it is desirable to match the appropriate frequency of the torsional vibration damper pulley to reduce crankshaft torsional vibration when designing the engine.
A torsional Vibration damping pulley, also known in the automotive industry as tvd (torque Vibration damper), generally consists of three main parts, an inertia ring, rubber and a hub, which is usually bolted to the crankshaft of the engine. The inertia ring and the rubber play a vibration absorption role similar to that of a dynamic vibration absorber, from the mechanical point of view, the torsion vibration absorption belt pulley is an inertia-rigidity-damping vibration system in the rotation direction, the inertia ring is a concentrated inertia and can be directly measured easily, the rubber can be regarded as a spring with certain rigidity and damping, and the inertia ring and the rubber determine the natural frequency of the torsion vibration absorption belt pulley. However, the stiffness and damping of rubber are related to the formulation, shape, temperature and the like of the rubber material, and the rubber material has a nonlinear phenomenon, and the frequency response of the rubber material is different under excitation of different amplitudes, so that the stiffness and damping of rubber can not be directly obtained generally, which brings difficulty to the acquisition of the natural frequency of the torsional vibration damping pulley. Whether the torsional vibration damping belt pulley can well play a vibration damping role is the most important thing, namely, a proper natural frequency is designed according to the torsional vibration characteristic matching of an engine; therefore, the method has great engineering significance for accurately measuring the natural frequency of the torsional vibration damping belt pulley under the actual operation condition of the engine by a scientific method.
CN108469339A discloses an integrated damping pulley characteristic testing device, which is separated from the actual operation condition of the engine, and simulates the torsional vibration of the engine with a vibration exciter so as to excite the response of the torsional damping pulley. Such a test device has the following problems: (1) the vibration exciter is used for exciting small-amplitude reciprocating torsional motion of the vibration damping belt pulley to replace continuous rotary motion of driving equipment under the actual operation condition, and although the vibration exciter is correct in principle, the technical problem of how to measure the natural frequency of the torsional vibration damping belt pulley under the actual operation condition is solved; (2) the nonlinear characteristic of the rubber material is ignored, and the influence of the excitation amplitude on the natural frequency response of the torsion damping belt pulley is not considered, so the test result is not the real frequency value of the torsion damping belt pulley under the actual working condition; (3) neglecting the influence of the damping of rubber materials, the inherent frequency of the torsional vibration damping belt pulley calculated by the amplitude and the phase of the frequency response function of the torsional vibration damping belt pulley calculated by the industrial control cabinet is inaccurate.
Disclosure of Invention
The invention aims to provide a system and a method for testing the natural frequency of a torsional vibration damping belt pulley so as to accurately obtain the natural frequency of the torsional vibration damping belt pulley.
The invention relates to a natural frequency testing system of a torsional vibration damping belt pulley, which comprises data acquisition equipment, a PC (personal computer), driving equipment, a first torsional vibration sensor, a second torsional vibration sensor, a temperature measuring instrument and a tachometer, wherein the first torsional vibration sensor, the second torsional vibration sensor, the temperature measuring instrument and the tachometer are respectively connected with the data acquisition equipment; during the test, the torsional vibration damping belt pulley is installed on the drive device, the drive device drives the torsional vibration damping belt pulley to rotate continuously, the first torsional vibration sensor measures the hub torsional vibration signal of the torsional vibration damping belt pulley, the second torsional vibration sensor measures the inertia ring torsional vibration signal of the torsional vibration damping belt pulley, the temperature measuring instrument measures the temperature signal of the torsional vibration damping belt pulley, the tachometer acquires the revolution speed signal of the torsional vibration damping belt pulley, and the data acquisition device acquires the hub torsional vibration signal, the inertia ring torsional vibration signal, the temperature signal and the revolution speed signal under the control of the PC computer and sends the signals to the PC computer for processing, storing and outputting reports. Wherein the temperature signal does not participate in calculating the natural frequency of the torsional vibration damping pulley; in general, the natural frequency of the torsional vibration damper pulley can be calculated without a test temperature signal, but the natural frequency of the torsional vibration damper pulley is temperature dependent, so the measurement of the temperature signal is to note that the natural frequency of the torsional vibration damper pulley is the result of the test at a particular temperature.
Preferably, the driving device is an engine or a power machine capable of simulating the running state of the engine. In addition, the drive device may be other rotating mechanical devices that require damping using torsional damping pulleys.
Preferably, the first torsional vibration sensor and the second torsional vibration sensor are both non-contact torsional vibration sensors, and the temperature measuring instrument is a non-contact temperature sensor; during the test, first torsional vibration sensor is installed at the position of the wheel hub that is close to torsional vibration damping belt pulley, and the position at the inertia ring that is close to torsional vibration damping belt pulley is installed to second torsional vibration sensor, and the position at the rubber that is close to torsional vibration damping belt pulley is installed to the temperature measuring apparatu, the tachometer with the drive device is connected, acquires from the drive device tachometric signal (because the rotational speed of torsional vibration damping belt pulley equals with the rotational speed of drive device).
The invention discloses a natural frequency testing method of a torsional vibration damping belt pulley, which adopts the natural frequency testing system and specifically comprises the following steps:
the driving equipment performs variable speed motion under the full-load working condition to drive the torsion damping belt pulley to continuously rotate so as to realize frequency sweep excitation of the torsion damping belt pulley by the self torsion vibration of the driving equipment; the driving device performs variable speed motion under the full load working condition to excite the broadband torsional vibration response of the torsional vibration damping belt pulley, and the variable speed motion forms include but are not limited to monotone acceleration, monotone deceleration, non-monotone acceleration and non-monotone deceleration.
And the PC computer receives a hub torsional vibration signal, an inertia ring torsional vibration signal, a temperature signal and a rotating speed signal which are sent by the data acquisition equipment in the whole variable speed motion process.
The PC computer tracks the rotating speed signal by the hub torsional vibration signal and the inertia ring torsional vibration signal by using a Kalman filter to process so as to obtain a single-order component of the hub torsional vibration signal and a single-order component of the inertia ring torsional vibration signal; wherein the order in the single order component is the engine prime order (e.g., 2 or 4 or 6 or 8 or 10 in a four cylinder engine) and the excitation frequency range corresponding to the order covers the known natural frequency range of the torsional vibration damper pulley (which is provided by the supplier of the torsional vibration damper pulley).
The PC calculates the single-order component of the hub torsional vibration signal and the single-order component of the inertia ring torsional vibration signal by utilizing a Fourier transform technology to obtain a transfer function H (omega) of the inertia ring torsional vibration relative to the hub torsional vibration; where ω represents frequency.
The PC computer utilizes the formula: h '(ω) ═ H (ω) -1, and a reference function H' (ω) is calculated; the operation of the method can eliminate the influence of the rubber material damping on the test result in principle.
The PC computer processes the reference function H' (omega) to obtain the natural frequency omega0Processing the temperature signal to obtain a measured temperature T0。
Obtaining the measured temperature T of the torsional vibration damping pulley0Natural frequency of lower is ω0Test report (i.e., test result) of (c).
Preferably, the natural frequency ω0This can be achieved in two ways: first, the frequency at which the real part of the PC-calculated reference function H' (ω) is equal to 0 is the natural frequency ω0(ii) a Second, the PC calculates the phase-frequency curve of the reference function H' (omega) using a complex algorithm
And using the formula:
calculating to obtain the natural frequency omega0I.e. at the phase frequency curve
The frequency corresponding to the-90 phase is found, i.e. the natural frequency ω0。
The invention relates to another natural frequency testing method of a torsional vibration damping belt pulley, which adopts the natural frequency testing system and specifically comprises the following steps:
the driving equipment performs variable speed motion under the full-load working condition to drive the torsion damping belt pulley to continuously rotate so as to realize frequency sweep excitation of the torsion damping belt pulley by the self torsion vibration of the driving equipment; the driving device performs variable speed motion under the full load working condition to excite the broadband torsional vibration response of the torsional vibration damping belt pulley, and the variable speed motion forms include but are not limited to monotone acceleration, monotone deceleration, non-monotone acceleration and non-monotone deceleration.
And the PC computer receives a hub torsional vibration signal, an inertia ring torsional vibration signal, a temperature signal and a rotating speed signal which are sent by the data acquisition equipment in the whole variable speed motion process.
The PC computer tracks the rotating speed signal by the hub torsional vibration signal and the inertia ring torsional vibration signal by using a Kalman filter to process so as to obtain a single-order component of the hub torsional vibration signal and a single-order component of the inertia ring torsional vibration signal; wherein the order in the single order component is the engine prime order (such as 2 or 4 or 6 or 8 or 10 in a four cylinder engine) and the excitation frequency range corresponding to that order covers the known natural frequency range of the torsional vibration damper pulley (which is provided by the supplier of the torsional vibration damper pulley).
The PC calculates the single-order component of the hub torsional vibration signal and the single-order component of the inertia ring torsional vibration signal by utilizing a Fourier transform technology to obtain a transfer function H (omega) of the inertia ring torsional vibration relative to the hub torsional vibration; where ω represents frequency.
The PC computer utilizes the formula: h "(ω) 1-H (ω), and a reference function H" (ω) is calculated; the operation of the method can eliminate the influence of the rubber material damping on the test result in principle.
The PC computer processes the reference function H' (omega) to obtain the natural frequency omega0Processing the temperature signal to obtain a measured temperature T0。
Obtaining the measured temperature T of the torsional vibration damping pulley0Natural frequency of lower is ω0Test report (i.e., test result) of (c).
Preferably, the natural frequency ω0This can be achieved in two ways: first, the frequency at which the real part of the PC-computed reference function H "(ω) is equal to 0 is the natural frequency ω0(ii) a Second, the PC calculates the phase-frequency curve of the reference function H' (omega) using a complex algorithm
And using the formula:
calculating to obtain the natural frequency omega0I.e. at the phase frequency curve
The frequency corresponding to the phase of 90 deg. is found, i.e. the natural frequency omega0。
Preferably, the measurement temperature T0This can be achieved in two ways: firstly, the PC computer calculates the average of the temperature signals in the whole variable speed motion process to obtain the measured temperature T0(ii) a Second, PC computer calculates natural frequency omega0Speed n of the corresponding torsional vibration damping belt pulley0Then, the temperature signal during the whole speed-changing movement is inquired to determine when the rotation speed of the torsion damping belt wheel reaches n0The temperature of the vibration damping pulley is then set as the measured temperature T0。
The invention utilizes the driving device to do variable speed motion under the full load working condition (equivalent to the actual running state) to drive the torsion vibration damping belt pulley to continuously rotate, realizes the sweep frequency excitation of the torsion vibration damping belt pulley by the self torsion vibration of the driving device, avoids the influence of the excitation amplitude on the test result, and eliminates the influence of rubber material damping on the test result in principle through further signal processing, thereby accurately obtaining the natural frequency of the torsion vibration damping belt pulley. The present invention may be applied to the natural frequency testing of torsional vibration damper pulleys on engines and other rotary mechanical devices.
Drawings
FIG. 1 is a plan view of a torsional vibration damper pulley.
FIG. 2 is a schematic view of a system for testing the natural frequency of the torsional vibration damper pulley of example 1.
Fig. 3 is a schematic diagram of a signal processing flow in embodiment 1.
FIG. 4 is an exemplary graph of the test results of example 1.
Fig. 5 is a schematic diagram of a signal processing flow in embodiment 2.
Fig. 6 is a schematic diagram of a signal processing flow in embodiment 3.
Fig. 7 is a schematic diagram of a signal processing flow in embodiment 4.
Detailed Description
Example 1: the natural frequency testing system of the torsional vibration damping pulley shown in fig. 1 and 2 is used for testing the natural frequency of the torsional vibration damping pulley on an engine, and comprises a first torsional vibration sensor 1, a second torsional vibration sensor 2, a temperature measuring instrument 3, a tachometer 4, a data acquisition device 5, a PC computer 6 and a driving device, wherein the driving device is the engine 8, the first torsional vibration sensor 1 and the second torsional vibration sensor 2 are both non-contact torsional vibration sensors, the temperature measuring instrument 3 is a non-contact temperature sensor, the first torsional vibration sensor 1, the second torsional vibration sensor 2, the temperature measuring instrument 3 and the tachometer 4 are respectively connected with the data acquisition device 5 through signal transmission lines, and the data acquisition device 5 is connected with the PC computer 6 through signal transmission lines. During testing, the torsional vibration damping belt pulley 7 is arranged on a crankshaft of the engine 8, and the engine 8 drives the torsional vibration damping belt pulley 7 to continuously rotate; the first torsional vibration sensor 1 is installed at a position close to the hub 71 of the torsional vibration damping pulley 7, and measures a hub torsional vibration signal of the torsional vibration damping pulley 7; the second torsional vibration sensor 2 is installed at a position close to the inertia ring 72 of the torsional vibration damping pulley 7, and measures an inertia ring torsional vibration signal of the torsional vibration damping pulley 7; the temperature measuring instrument 3 is installed at a position close to the rubber 73 of the torsion damping pulley 7, and measures a temperature signal of the torsion damping pulley 7; the revolution meter 4 is connected with the engine 8 through a signal transmission line, a revolution speed signal of the engine 8 is obtained from a CAN line, the revolution speed of the torsional vibration damping belt pulley 7 is equal to the revolution speed of the engine 8, the revolution speed signal obtained by the revolution meter 4 is also a revolution speed signal of the torsional vibration damping belt pulley 7, and the data acquisition equipment 5 acquires the hub torsional vibration signal, the inertia ring torsional vibration signal, the temperature signal and the revolution speed signal under the control of the PC 6 and sends the signals to the PC 6 for processing, storing and outputting a test report.
In addition, the drive device may be a power machine that can simulate the engine operating state.
As shown in fig. 3, the method for testing the natural frequency of the torsional vibration damping pulley, which adopts the natural frequency testing system, specifically comprises:
the method comprises the following steps that firstly, an engine 8 is started and heated to a normal working state, the engine 8 is uniformly accelerated to a rated rotating speed from 1000rpm under a full-load working condition (namely the working condition of the engine when the opening of a throttle valve is 100%), the rising rate of uniform acceleration is 50rpm/s, the engine 8 drives a torsion damping belt pulley 7 to continuously rotate, and sweep frequency excitation of the torsion damping belt pulley 7 is realized by the self torsion vibration of the engine 8;
secondly, the PC 6 receives a hub torsional vibration signal, an inertia ring torsional vibration signal, a temperature signal and a rotating speed signal which are sent by the data acquisition equipment 5 in the whole acceleration process;
thirdly, the PC 6 processes the received hub torsional vibration signal and the inertia ring torsional vibration signal tracking rotating speed signal by using a Kalman filter to obtain a 6-order component of the hub torsional vibration signal and a 6-order component of the inertia ring torsional vibration signal;
fourthly, the PC 6 calculates the 6-order component of the hub torsional vibration signal and the 6-order component of the inertia ring torsional vibration signal by utilizing a Fourier transform technology to obtain a transfer function H (omega) of the inertia ring torsional vibration relative to the hub torsional vibration, wherein omega represents frequency;
fifth, the PC computer 6 uses the formula: h '(ω) ═ H (ω) -1, and a reference function H' (ω) is calculated;
sixth, the PC 6 calculates the phase-frequency curve of the reference function H' (omega) by using a complex algorithm
(see FIG. 4), from FIG. 4 it can be observed
Is a curve gradually approaching from 0 deg. to-180 deg. as the frequency omega increases, then
The corresponding frequency is the natural frequency ω of the torsional vibration damper pulley 70(ii) a Then and using the formula:
calculating to obtain the natural frequency omega0I.e. at the phase frequency curve
The frequency corresponding to the-90 DEG phase is found, i.e. the natural frequency omega0；
Seventh step, the PC computer 6 uses the formula:
calculating the natural frequency omega0Speed n of the corresponding torsional vibration damping belt pulley0Then the temperature signal is looked up throughout the acceleration process, determining when the speed of rotation of the torsional vibration damper pulley 7 reaches n0The temperature of the damper pulley is then twisted and used as the measured temperature T0；
Eighth step, the PC computer 6 outputs the torsion damping belt pulley 7 at the measured temperature T0Natural frequency of lower is ω0Test report (i.e., test result) of (c).
Example 2: the natural frequency test system of the torsional vibration damping pulley in this embodiment is the same as that of embodiment 1; as shown in fig. 5, the natural frequency testing method of the torsional vibration damping pulley in the present embodiment includes:
the method comprises the following steps that firstly, an engine 8 is started and heated to a normal working state, the engine 8 is uniformly decelerated to 1000rpm from a rated rotation speed under a full-load working condition (namely, the engine working condition when the opening of a throttle valve is 100%), the deceleration rate of the uniform deceleration is 100rpm/s, the engine 8 drives a torsional vibration damping belt pulley 7 to continuously rotate, and sweep frequency excitation of the torsional vibration damping belt pulley 7 is realized through torsional vibration of the engine 8;
secondly, the PC 6 receives a hub torsional vibration signal, an inertia ring torsional vibration signal, a temperature signal and a rotating speed signal which are sent by the data acquisition equipment 5 in the whole speed reduction process;
thirdly, the PC 6 processes the received hub torsional vibration signal and the inertia ring torsional vibration signal tracking rotating speed signal by using a Kalman filter to obtain a 4-order component of the hub torsional vibration signal and a 4-order component of the inertia ring torsional vibration signal;
fourthly, the PC 6 calculates 4-order components of the hub torsional vibration signal and 4-order components of the inertia ring torsional vibration signal by utilizing a Fourier transform technology to obtain a transfer function H (omega) of the inertia ring torsional vibration relative to the hub torsional vibration, wherein omega represents frequency;
fifth, the PC computer 6 uses the formula: h '(ω) ═ H (ω) -1, and a reference function H' (ω) is calculated;
sixth, the PC computer 6 calculates a frequency at which the real part of the reference function H' (ω) is equal to 0, and sets the frequency as a natural frequency ω0；
Seventhly, the PC 6 calculates the average of the temperature signals in the whole deceleration process to obtain the measured temperature T0；
Eighth step, the PC computer 6 outputs the torsion damping belt pulley 7 at the measured temperature T0Natural frequency of lower is ω0Test report (i.e., test result) of (c).
Example 3: the natural frequency test system of the torsional vibration damping pulley in this embodiment is the same as that of embodiment 1; as shown in fig. 6, the natural frequency testing method of the torsional vibration damping pulley in the present embodiment includes:
firstly, starting an engine 8 and heating the engine to a normal working state, uniformly accelerating the engine 8 from 1000rpm to 4000rpm under a full load working condition (namely the working condition of the engine when the opening of a throttle valve is 100 percent), uniformly decelerating from 4000rpm to 2500rpm, uniformly accelerating from 2500rpm to a rated rotating speed, wherein the rising rate of uniform acceleration is 50rpm/s, the falling rate of uniform deceleration is 50rpm/s, the engine 8 drives a torsional vibration damping belt pulley 7 to continuously rotate, and the sweep frequency excitation of the torsional vibration damping belt pulley 7 is realized by the torsional vibration of the engine 8;
secondly, the PC 6 receives a hub torsional vibration signal, an inertia ring torsional vibration signal, a temperature signal and a rotating speed signal which are sent by the data acquisition equipment 5 in the whole variable speed motion process;
thirdly, the PC 6 processes the received hub torsional vibration signal and the inertia ring torsional vibration signal tracking rotating speed signal by using a Kalman filter to obtain an 8-order component of the hub torsional vibration signal and an 8-order component of the inertia ring torsional vibration signal;
fourthly, the PC 6 calculates 8-order components of the hub torsional vibration signals and 8-order components of the inertia ring torsional vibration signals by utilizing a Fourier transform technology to obtain a transfer function H (omega) of the inertia ring torsional vibration relative to the hub torsional vibration, wherein omega represents frequency;
fifth, the PC computer 6 uses the formula: h "(ω) 1-H (ω), and a reference function H" (ω) is calculated;
sixth, the PC 6 calculates the phase-frequency curve of the reference function H' (omega) by using a complex algorithm
Is a curve gradually approaching from 0 deg. to 180 deg. as the frequency omega increases, then
The corresponding frequency is the natural frequency ω of the torsional vibration damper pulley 70(ii) a Then using the formula:
calculating to obtain natural frequency omega0I.e. at the phase frequency curve
The frequency corresponding to the phase of 90 deg. is found, i.e. the natural frequency omega0；
Seventh step, the PC computer 6 uses the formula:
calculating the natural frequency omega0Corresponding rotational speed n of the torsional vibration damping belt pulley 70Then, the temperature signal is looked up during the entire speed change movement to determine when the rotational speed of the torsional vibration damper pulley 7 reaches n0The temperature of the damper pulley 7 is then set as the measured temperature T0；
Eighth step, the PC computer 6 outputs the torsion damping belt pulley 7 at the measured temperature T0Natural frequency of lower is ω0Test report (i.e., test result) of (c).
Example 4: the natural frequency test system of the torsional vibration damping pulley in this embodiment is the same as that of embodiment 1; as shown in fig. 7, the natural frequency testing method of the torsional vibration damping pulley in the present embodiment includes:
the method comprises the following steps that firstly, an engine 8 is started and heated to a normal working state, the engine 8 is uniformly accelerated to a rated rotating speed from 1000rpm under a full-load working condition (namely the working condition of the engine when the opening of a throttle valve is 100%), the rising rate of uniform acceleration is 50rpm/s, the engine 8 drives a torsion damping belt pulley 7 to continuously rotate, and sweep frequency excitation of the torsion damping belt pulley 7 is realized by the self torsion vibration of the engine 8;
secondly, the PC 6 receives a hub torsional vibration signal, an inertia ring torsional vibration signal, a temperature signal and a rotating speed signal which are sent by the data acquisition equipment 5 in the whole acceleration process;
thirdly, the PC 6 processes the received hub torsional vibration signal and the inertia ring torsional vibration signal tracking rotating speed signal by using a Kalman filter to obtain a 6-order component of the hub torsional vibration signal and a 6-order component of the inertia ring torsional vibration signal;
fourthly, the PC 6 calculates the 6-order component of the hub torsional vibration signal and the 6-order component of the inertia ring torsional vibration signal by utilizing a Fourier transform technology to obtain a transfer function H (omega) of the inertia ring torsional vibration relative to the hub torsional vibration, wherein omega represents frequency;
fifth, the PC computer 6 uses the formula: h "(ω) 1-H (ω), and a reference function H" (ω) is calculated;
sixth, the PC computer 6 calculates a frequency at which the real part of the reference function H ″ (ω) is equal to 0, and takes the frequency as the natural frequency ω0；
Seventhly, the PC 6 calculates the average of the temperature signals in the whole acceleration process to obtain the measured temperature T0；
Eighth step, the PC computer 6 outputs the torsion damping belt pulley 7 at the measured temperature T0Natural frequency of lower is ω0Test report (i.e., test result) of (c).
Claims (12)
1. A natural frequency testing method of a torsional vibration damping belt pulley is characterized in that an adopted natural frequency testing system comprises data acquisition equipment (5), a PC (personal computer) (6), driving equipment, a first torsional vibration sensor (1), a second torsional vibration sensor (2), a temperature measuring instrument (3) and a tachometer (4), wherein the first torsional vibration sensor (1), the second torsional vibration sensor (2), the temperature measuring instrument (3) and the tachometer (4) are respectively connected with the data acquisition equipment (5), and the data acquisition equipment (5) is connected with the PC (6); during testing, the torsional vibration damping belt pulley (7) is installed on driving equipment, the driving equipment drives the torsional vibration damping belt pulley (7) to continuously rotate, the first torsional vibration sensor (1) measures a hub torsional vibration signal of the torsional vibration damping belt pulley (7), the second torsional vibration sensor (2) measures an inertia ring torsional vibration signal of the torsional vibration damping belt pulley (7), the temperature measuring instrument (3) measures a temperature signal of the torsional vibration damping belt pulley (7), the revolution meter (4) acquires a revolution speed signal of the torsional vibration damping belt pulley (7), and the data acquisition equipment (5) acquires the hub torsional vibration signal, the inertia ring torsional vibration signal, the temperature signal and the revolution speed signal under the control of the PC (6) and sends the signals to the PC (6) for processing, storing and outputting a test report; characterized in that the method comprises:
the driving equipment performs variable speed motion under the full-load working condition to drive the torsion damping belt pulley (7) to continuously rotate so as to realize frequency sweep excitation of the torsion damping belt pulley (7) by the self torsion vibration of the driving equipment;
the PC (6) receives a hub torsional vibration signal, an inertia ring torsional vibration signal, a temperature signal and a rotating speed signal which are sent by the data acquisition equipment (5) in the whole variable speed motion process;
the PC (6) utilizes a Kalman filter to track the rotating speed signal for processing the hub torsional vibration signal and the inertia ring torsional vibration signal to obtain a single-order component of the hub torsional vibration signal and a single-order component of the inertia ring torsional vibration signal; the order in the single-order component is the primary order of the engine, and the excitation frequency range corresponding to the order can cover the known natural frequency range of the torsion damping belt pulley;
the PC (6) calculates the single-order component of the hub torsional vibration signal and the single-order component of the inertia ring torsional vibration signal by utilizing a Fourier transform technology to obtain a transfer function H (omega) of the inertia ring torsional vibration relative to the hub torsional vibration;
the PC computer (6) uses the formula: h '(ω) ═ H (ω) -1, and a reference function H' (ω) is calculated;
the PC (6) processes the reference function H' (omega) to obtain the natural frequency omega0Processing the temperature signal to obtain a measured temperature T0；
Obtaining the measured temperature T of the torsional vibration damping pulley (7)0Natural frequency of lower is ω0The test report of (1).
2. The method of testing the natural frequency of a torsional vibration damper pulley as set forth in claim 1, wherein: the driving device is an engine (8) or a power machine capable of simulating the running state of the engine.
3. The method of testing the natural frequency of a torsional vibration damper pulley of claim 2, wherein: the first torsional vibration sensor (1) and the second torsional vibration sensor (2) are both non-contact torsional vibration sensors, and the temperature measuring instrument (3) is a non-contact temperature sensor; during testing, the first torsional vibration sensor (1) is installed at a position close to a hub (71) of the torsional vibration damping belt pulley (7), the second torsional vibration sensor (2) is installed at a position close to an inertia ring (72) of the torsional vibration damping belt pulley (7), the temperature measuring instrument (3) is installed at a position close to rubber (73) of the torsional vibration damping belt pulley (7), the tachometer (4) is connected with the driving equipment, and the rotating speed signal is obtained from the driving equipment.
4. The method of testing the natural frequency of a torsional vibration damper pulley of claim 3, wherein: the PC computer (6) calculates the frequency at which the real part of the reference function H' (ω) is equal to 0, i.e. the natural frequency ω0。
5. The method of testing the natural frequency of a torsional vibration damper pulley of claim 3, wherein: the PC (6) calculates the phase-frequency curve of the reference function H' (omega) by using a complex algorithm
And using the formula:
calculating to obtain the natural frequency omega0。
6. The method for testing the natural frequency of a torsional vibration damper pulley according to any one of claims 1 to 5, wherein: the PC (6) calculates the average of the temperature signals in the whole variable speed motion process to obtain the measured temperature T0(ii) a Or the PC computer (6) calculates the natural frequency omega0Speed n of the corresponding torsional vibration damping belt pulley0Then, the temperature signal during the whole speed-changing movement is inquired to determine when the rotation speed of the torsion damping belt wheel reaches n0The temperature of the vibration damping pulley is then set as the measured temperature T0。
7. A natural frequency testing method of a torsional vibration damping belt pulley is characterized in that an adopted natural frequency testing system comprises data acquisition equipment (5), a PC (personal computer) (6), driving equipment, a first torsional vibration sensor (1), a second torsional vibration sensor (2), a temperature measuring instrument (3) and a tachometer (4), wherein the first torsional vibration sensor (1), the second torsional vibration sensor (2), the temperature measuring instrument (3) and the tachometer (4) are respectively connected with the data acquisition equipment (5), and the data acquisition equipment (5) is connected with the PC (6); during testing, the torsional vibration damping belt pulley (7) is installed on driving equipment, the driving equipment drives the torsional vibration damping belt pulley (7) to continuously rotate, the first torsional vibration sensor (1) measures a hub torsional vibration signal of the torsional vibration damping belt pulley (7), the second torsional vibration sensor (2) measures an inertia ring torsional vibration signal of the torsional vibration damping belt pulley (7), the temperature measuring instrument (3) measures a temperature signal of the torsional vibration damping belt pulley (7), the revolution meter (4) acquires a revolution speed signal of the torsional vibration damping belt pulley (7), and the data acquisition equipment (5) acquires the hub torsional vibration signal, the inertia ring torsional vibration signal, the temperature signal and the revolution speed signal under the control of the PC (6) and sends the signals to the PC (6) for processing, storing and outputting a test report; characterized in that the method comprises:
the driving equipment performs variable speed motion under the full-load working condition to drive the torsion damping belt pulley (7) to continuously rotate so as to realize frequency sweep excitation of the torsion damping belt pulley (7) by the self torsion vibration of the driving equipment;
the PC (6) receives a hub torsional vibration signal, an inertia ring torsional vibration signal, a temperature signal and a rotating speed signal which are sent by the data acquisition equipment (5) in the whole variable speed motion process;
the PC (6) utilizes a Kalman filter to track the rotating speed signal for processing the hub torsional vibration signal and the inertia ring torsional vibration signal to obtain a single-order component of the hub torsional vibration signal and a single-order component of the inertia ring torsional vibration signal; the order in the single-order component is the primary order of the engine, and the excitation frequency range corresponding to the order can cover the known natural frequency range of the torsion damping belt pulley;
the PC (6) calculates the single-order component of the hub torsional vibration signal and the single-order component of the inertia ring torsional vibration signal by utilizing a Fourier transform technology to obtain a transfer function H (omega) of the inertia ring torsional vibration relative to the hub torsional vibration;
the PC computer (6) uses the formula: h "(ω) 1-H (ω), and calculating a reference function H" (ω);
the PC (6) processes the reference function H' (omega) to obtain the natural frequency omega0Processing the temperature signal to obtain a measured temperature T0；
Obtaining the measured temperature T of the torsional vibration damping pulley (7)0Natural frequency of lower is ω0The test report of (1).
8. The method of testing the natural frequency of a torsional vibration damper pulley of claim 7, wherein: the driving device is an engine (8) or a power machine capable of simulating the running state of the engine.
9. The method of testing the natural frequency of a torsional vibration damper pulley as set forth in claim 8, wherein: the first torsional vibration sensor (1) and the second torsional vibration sensor (2) are both non-contact torsional vibration sensors, and the temperature measuring instrument (3) is a non-contact temperature sensor; during testing, the first torsional vibration sensor (1) is installed at a position close to a hub (71) of the torsional vibration damping belt pulley (7), the second torsional vibration sensor (2) is installed at a position close to an inertia ring (72) of the torsional vibration damping belt pulley (7), the temperature measuring instrument (3) is installed at a position close to rubber (73) of the torsional vibration damping belt pulley (7), the tachometer (4) is connected with the driving equipment, and the rotating speed signal is obtained from the driving equipment.
10. The method of testing the natural frequency of a torsional vibration damper pulley of claim 9, wherein: the PC computer (6) calculates the frequency at which the real part of the reference function H' (omega) is equal to 0, i.e. the natural frequency omega0。
11. The method of testing the natural frequency of a torsional vibration damper pulley of claim 9, wherein: the PC (6) calculates the phase-frequency curve of the reference function H' (omega) by using a complex algorithm
And using the formula:
calculating to obtain the natural frequency omega0。
12. The method for testing the natural frequency of a torsional vibration damper pulley according to any one of claims 7 to 11, wherein: the PC (6) calculates the average of the temperature signals in the whole variable speed motion process to obtain the measured temperature T0(ii) a Or the PC computer (6) calculates the natural frequency omega0Speed n of the corresponding torsional vibration damping belt pulley0Then, the temperature signal during the whole speed-changing movement is inquired to determine when the rotation speed of the torsion damping belt wheel reaches n0The temperature of the vibration damping pulley is then set as the measured temperature T0。
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