Ctive function E2 , whichis shown in Equation (15). Fp (i) = E2 =1 ^ (15) Fp (i)=E2= ( P(i) – P(i,))two In Equations (14) and (15), I represents ithe total number of sampling points and Ii represents the i-th sampling point. In Equations (14) and (15), I damping and contact dampingsampling points and i In Strategy three, the structural represents the total variety of on the transducer are represents the i-th sampling entered as known values into the parameter identification measured, calculated, and point. In Technique 3, the structural damping and speak to damping from the transducer are measured, calculated, and entered as recognized values into the parameter identification approach. The settings for each the unknown parameters and fitness function, as well because the algorithm iteration process, will be the very same as in Method 2.1 I two ^ ( P(i) – P(i,)) I iI(15)Micromachines 2021, 12,8 ofMicromachines 2021, 12, x FOR PEER REVIEW9 ofprocess. The settings for each the unknown parameters and fitness function, at the same time as the algorithm iteration procedure, will be the similar as in Strategy two.3. Experimental Measurement 3. Experimental Measurement 3.1. The Measurement on the Displacement Plunger’s Structural Damping three.1. The Measurement with the Displacement Plunger’s Structural Damping The damping ratios stainless steel 304 304 have been 3-Hydroxyacetophenone References measured by way of regular modal The damping ratios of of stainless steel bars bars had been measured by means of standard modal testing and after that calculated by the structural damping in the displacement [32,33]. testing after which calculated by the structural damping with the displacement plunger plunger A typical cylindrical sample sample diameter of 50 mm50 mm lengthlength ofmm was [32,33]. A common cylindrical with a having a diameter of along with a and a of 1500 1500 mm ready. At this size, the organic Phenylacetylglutamine In stock frequency for the for the first longitudinal vibration on the was ready. At this size, the organic frequency initially longitudinal vibration on the sample is usually close be the workingworking frequency in the transducer. The test equipment is sample can to close for the frequency of the transducer. The test equipment is shown in Figure six. The piezoelectric accelerometers, as well because the real-time data measurement shown in Figure six. The piezoelectric accelerometers, as well because the real-time information measand evaluation instrument DH5922DDH5922D and its analysis have been sourced from Donghua urement and analysis instrument and its evaluation software, software, were sourced from Testing Technology Co., Ltd (Taizhou, China). TheChina). The was hung with ahungelastica Donghua Testing Technologies Co., Ltd (Taizhou, sample bar sample bar was soft with rope elastic rope plus the point was located was located on the modal sample. A levelling soft along with the suspension suspension point around the modal node from the node from the sample. instrument was made use of to check regardless of whether the rod was level. was level. A force was utilised to A levelling instrument was utilized to verify irrespective of whether the rod A force hammer hammer was apply toforce on one particular finish of your finish with the bar, and 4 piezoelectric accelerometers were applied a apply a force on a single bar, and four piezoelectric accelerometers have been installed around the other endthe measure the resulting the resulting acceleration. installed on to other finish to measure acceleration.304 Stainless Steel Bar for TestSoft Elastic RopePiezoelectric Accelerometer Dynamic Signal Analyzer 5 kN Test hammerReal Time Information Measurement and Analysis Instrument DH5922DFigure 6. Experimental device for e.