11 results about "Piezoelectric voltage" patented technology

A method includes receiving, by a piezoelectric stack of a transducer, a first piezoelectric voltage. The transducer has a base structure and a first layer, the base structure having a first displacement between a first portion of the base structure and the first layer. The method also includes transmitting, by the transducer, a first ultrasound frequency while receiving a first piezoelectric voltage, and receiving, by the transducer, a first bias voltage. The received first bias voltage alters the first displacement between the first portion of the base structure and the first layer, and the altered first displacement is smaller than the first displacement. The method further includes receiving, by the piezoelectric stack of the transducer, a second piezoelectric voltage to the transducer, and transmitting, by the transducer, a second ultrasound frequency while receiving the first bias voltage and the second piezoelectric voltage.

A method includes receiving, by a piezoelectric stack of a transducer, a first piezoelectric voltage. The transducer has a base structure and a first layer, the base structure having a first displacement between a first portion of the base structure and the first layer. The method also includes transmitting, by the transducer, a first ultrasound frequency while receiving a first piezoelectric voltage, and receiving, by the transducer, a first bias voltage. The received first bias voltage alters the first displacement between the first portion of the base structure and the first layer, and the altered first displacement is smaller than the first displacement. The method further includes receiving, by the piezoelectric stack of the transducer, a second piezoelectric voltage to the transducer, and transmitting, by the transducer, a second ultrasound frequency while receiving the first bias voltage and the second piezoelectric voltage.

The invention particularly relates to a random response analysis method for a piezoelectric-electromagnetic hybrid energy collector under pulsating wind excitation, and the method comprises the steps: building a mechanical vibration equation containing a galloping aerodynamic item and a time-delay feedback control item, and enabling the mechanical vibration equation to be combined with a piezoelectric voltage state equation and an electromagnetic current state equation to form an initial electromechanical coupling equation set; therefore, the mechanical end dynamics and the energy conversion effect of the two branches are simultaneously represented in the same model. Introducing the dimensionless fluctuating wind speed into galloping aerodynamic force and performing equivalent modeling by using multiplicative noise so as to explicitly map the fluctuating wind speed into a state-related random excitation item; voltage and current variables are equivalent to algebraic terms of displacement and speed by adopting harmonic transformation, and an equivalent decoupling system is obtained, so that model variable transformation is realized, and the analytical solution efficiency is improved; and finally, a steady-state probability density function is obtained based on energy envelope random averaging, and a random response analysis result is calculated according to the steady-state probability density function, so that a reliable basis is provided for evaluation of control parameters and energy harvesting performance.

The application relates to a breeding tail water treatment device and method based on piezoelectric strengthening, which comprises a water supply pump, a jet aerator, a biological aerated filter and an anaerobic tank. The application can improve the oxygen content of sewage and can induce piezoelectric air filter membranes to generate piezoelectric effect through flowing air, so as to obtain piezoelectric charge and voltage. The piezoelectric charge can react with oxygen and water to generate active oxygen species, so as to realize the conversion of air kinetic energy into electric energy and chemical energy. The piezoelectric voltage directly drives the anode and the cathode to work, and can enrich the functional bacteria of the biological treatment unit, improve the activity of functional microorganisms, and the active oxygen species can directly degrade organic pollutants, so as to synergistically enhance the performance of removing pollutants.

A porous, fine-grained piezoelectric energy harvesting ceramic and its preparation method are disclosed, belonging to the field of piezoelectric ceramic technology. The chemical composition of this piezoelectric ceramic is: Pb(Mg) 1 / 30 Ni 1 / 30 Nb 2 / 15 Zr 48 / 125 Ti 52 / 125 O3, its microstructure features include: different pore surface distribution densities (0 pores / mm²). 2 <Porous surface distribution density ≤12000 mm 2 By introducing low-dielectric-constant pores as a second phase into PZT-based ceramics with high voltage electrical properties, a ceramic with both high voltage electrical charge constant dp and high dielectric constant dp was designed and prepared. 33 and piezoelectric voltage constant g 33 Porous fine-grained PZT-based piezoelectric energy harvesting ceramics.

The application discloses a high-performance relaxor ferroelectric single crystal and a preparation method and application thereof, and belongs to the technical field of piezoelectric materials. Based on a TSSG method, through the synergistic effect of a bottom oxygen feeding technology and component regulation, a technical problem that a piezoelectric charge coefficient d 33 and a piezoelectric voltage coefficient g 33 are difficult to be considered simultaneously in the existing relaxor ferroelectric single crystal is successfully solved. The bottom oxygen feeding technology effectively inhibits Pb element volatilization and compensates oxygen vacancies, greatly reduces the defect density and the content of impurities in the crystal, and eliminates the pinning effect of defect dipoles on domain switching. In combination with accurate construction of a morphotropic phase boundary, the single crystal can fully release the polarization deflection advantage caused by the coexistence of multiple phases. The prepared PYN-PMN-PT relaxor ferroelectric single crystal realizes the coexistence of high piezoelectric response and excellent piezoelectric voltage coefficient, and significantly improves the quality factor of the material.

The invention discloses ultrasonic transducer pre-tightening force intelligent assembling equipment and method based on piezoelectric feedback, belongs to the technical field of intelligent manufacturing, and constructs a direct feedback closed-loop control system with a piezoelectric ceramic crystal pile as a force sensing element. A multi-stage self-adaptive control strategy is adopted, idle stroke feeding is sequentially executed to quickly eliminate the assembly clearance, an electrical seating point is accurately judged to serve as a loading starting point by synchronously monitoring piezoelectric voltage and real-time torque, then linear loading is conducted, the torque rate is calculated in real time to monitor the process state, when the piezoelectric voltage is close to a target value, low-speed micro-feeding is conducted, and when the torque rate is close to the target value, low-speed micro-feeding is conducted. And finally, the hardware comparator triggers hardware interruption at the moment that the voltage reaches a preset threshold value, and the control unit is driven to realize millisecond-level sudden stop, so that overshoot is completely eradicated fundamentally. The technical transition from indirect torque control to direct force feedback control is achieved, the pre-tightening force control precision is improved, meanwhile, the consistency and reliability of high-end ultrasonic transducer products are guaranteed, and the production efficiency is greatly improved.

Embodiments of the present application provide a wafer position adjustment method and device, electronic equipment and storage medium, and belong to the field of semiconductor manufacturing. The method comprises: obtaining a first rotation angle parameter of a wafer; calculating a rotation pulse of a worm gear mechanism according to a first relationship function and a first rotation angle sine value; driving the worm gear mechanism to perform first position adjustment on the wafer according to the rotation pulse; obtaining a second rotation angle parameter of the wafer after the first position adjustment; calculating a piezoelectric voltage of a piezoelectric driving mechanism according to a second relationship function and a second rotation angle sine value and a target rotation angle cosine value; and driving the piezoelectric driving mechanism to perform second position adjustment on the wafer according to the piezoelectric voltage, which can improve the wafer alignment accuracy.

The invention relates to a porous lead-free piezoelectric material, a preparation method thereof and a piezoelectric energy collector, and relates to the field of lead-free piezoelectric materials. The preparation method of the porous lead-free piezoelectric material comprises the following steps: preparing a ceramic substrate into a first piezoelectric film; preparing a second piezoelectric film from the ceramic matrix and a pore forming agent; a plurality of first piezoelectric films and a plurality of second piezoelectric films are stacked according to the sequence of the first piezoelectric films, the second piezoelectric films and the first piezoelectric films, and a multi-layer ceramic body is obtained. Compared with the prior art, the preparation method has the advantages that the addition amount of the pore-forming agent in the prepared porous ceramic layer and the thickness ratio are limited to be simultaneously within a specific range, so that the coupling relationship between the piezoelectric constant and the dielectric constant is effectively broken, and the piezoelectric voltage constant and the energy acquisition quality factor of the lead-free piezoelectric material are synergistically improved; therefore, the use requirements in the fields of piezoelectric energy collectors and the like are met, and the application prospect is wide.