Identification method of dynamic unbalance of auxiliary shaft of double-degree-of-freedom precision centrifuge based on main shaft vibration detection
A dynamic unbalance, precision centrifuge technology, applied in centrifuges and other directions, can solve problems such as dynamic unbalance of the secondary shaft of a double-degree-of-freedom precision centrifuge
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specific Embodiment approach 1
[0055] Specific implementation mode one: the following combination figure 1 To illustrate this embodiment, the method for identifying the dynamic unbalance of a secondary shaft of a two-degree-of-freedom precision centrifuge based on the vibration detection of the main shaft described in this embodiment includes the following steps:
[0056] Step 1. Test the vibration signal of the main shaft of the two-degree-of-freedom precision centrifuge, and obtain the main shaft tilt angle φ and the main shaft dynamic unbalance phase U of the centrifuge MP ;
[0057] Step 2. Phase identification of the dynamic unbalance of the secondary shaft of the two-degree-of-freedom precision centrifuge:
[0058] Combined with the spindle dynamic unbalance phase U MP , by comparing the vibration signal amplitudes of the main shaft corresponding to different positioning angles of the load compartment, the phase U of the dynamic unbalance of the centrifuge auxiliary shaft is obtained CP ;
[0059]...
specific Embodiment approach 2
[0062] Specific implementation mode two: the following combination Figure 1~3 Describe this implementation mode, the difference between this implementation mode and specific implementation mode 1 is:
[0063] The specific process of the phase identification of the dynamic unbalance of the secondary shaft of the two-degree-of-freedom precision centrifuge described in step 2 is as follows:
[0064] Step 21. Drive the main shaft of the two-degree-of-freedom precision centrifuge to run a mechanical circle at an angular velocity of 6 degrees per second, and collect the micro-displacement sensor S 1 and S 2 The data R 10 (θ Mj ) and R 20 (θ Mj ); the data acquisition method of the micro-displacement sensor signal is position sampling, that is, the fixed sampling position interval is δ degree, then the number of sampling points is n=360 / δ, and the selection of δ should make n an integer, i.e. θ Mj is a discrete spindle angular position signal, j=1,2,...,n, and the obtained dat...
specific Embodiment approach 3
[0083] Specific implementation mode three: the following combination Figure 4~5 This embodiment is described. The difference between this embodiment and the specific embodiment 1 or 2 is that in step 3, the specific process of calculating the amplitude of the dynamic unbalance of the auxiliary shaft of the two-degree-of-freedom precision centrifuge is as follows:
[0084] Step 31. Drive the main shaft of the two-degree-of-freedom precision centrifuge to run at a certain angular velocity ω, and control the auxiliary shaft at the angular position point U CP Do position fixed-point servo; record spindle micro-displacement sensor S 1 and S 2 The data R 1ωCP0 (θ Mj ) and R 2ωCP0 (θ Mj ), according to the method of steps 2 and 3, the first harmonics of the data collected by the two micro-displacement sensors are respectively and
[0085] Step 32: Drive the main shaft of the two-degree-of-freedom precision centrifuge to run at a certain angular velocity ω, and control the ...
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