研究目的
To propose a mass measurement method of a small object by using vibration for micromanipulation, including developing a simulation model and comparing it with experimental results.
研究成果
The resonance frequency of the tweezers increased when grasping an object, allowing mass estimation. Experimental trends matched the theoretical model, but the piezoelectric effect must be considered for accurate mass prediction. Future work should incorporate piezoelectric effects into simulations for better accuracy.
研究不足
The simulation model did not account for the inverse piezoelectric effect, which increased apparent stiffness and reduced frequency changes in experiments. Vibration modes mixed during transition states caused fluctuations in detected frequency. The method requires standardization of grasping force, which may not be precise for all objects.
1：Experimental Design and Method Selection:
The tweezers were designed with bimorph piezoelectric actuators as fingers, one as a vibrator and one as a grasper. A simulation model based on Bernoulli-Euler beam theory and spring-mass systems was used to predict resonance frequency changes.
2：Sample Selection and Data Sources:
Small objects made of stainless steel with masses from
3：5 to 0 mg were used. Data on displacement, voltage, and frequency were collected. List of Experimental Equipment and Materials:
Tweezers with bimorph piezoelectric actuators, frame made of AISI 1049-carbon steel, tips made of ASTM S30400-stainless steel, function generator, bipolar amplifier, phase shifter, automatic level control, charge amplifier, amplifier, counter, PC, low-pass and high-pass filters, displacement sensors, digital oscilloscope.
4：Experimental Procedures and Operational Workflow:
The vibrator was oscillated at its resonance frequency (~
5：5 kHz). The grasper's voltage was increased to close the tips and grasp objects. Displacement and frequency were measured during grasping. Data were acquired at specific sampling periods. Data Analysis Methods:
Resonance frequencies were calculated numerically from the model. Experimental frequency changes were averaged over multiple trials. Comparisons were made between simulation and experimental results, considering effects like piezoelectric charge generation.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容-
bimorph piezoelectric actuator
Acts as fingers in the tweezers for vibration and grasping, generating displacement and detecting charges.
-
function generator
Generates the oscillating signal for the vibrator.
-
bipolar amplifier
Amplifies signals for the piezoelectric actuators.
-
phase shifter
Shifts the phase of the signal for feedback control.
-
automatic level control
Controls the signal level automatically.
-
charge amplifier
Amplifies the charge generated by the piezoelectric effect.
-
amplifier
General amplification of signals.
-
counter
Measures frequency from the output voltage.
-
PC
Used for data acquisition and control.
-
band pass filter
LPF10kHz/HPF3kHz
Filters signals with cutoff frequencies of 3 Hz and 10 kHz.
-
displacement sensor
Measures the displacement of the finger tips.
-
digital oscilloscope
Acquires voltage and displacement data.
-
登录查看剩余10件设备及参数对照表
查看全部
