1. The current research on the adaptive structure of aircraft operating rudder surface mainly focuses on the design of adaptive wing trailing edge variant structure, the design of a new type of piezoelectric pump driver and the simulation calculation of two-dimensional adaptive wing flexible trailing edge dynamic aerodynamic characteristics. Research on piezoelectric functional materials and devices (1) Lead-free piezoelectric ceramics Lead-free piezoelectric ceramics refers to both the use of mechanical energy and electrical energy to convert each other and have a good ring
1, catalyst: rare earth elements can be used to manufacture catalysts to improve the efficiency and selectivity of chemical reactions, common applications include automotive exhaust purification systems, oil refining and chemical processes. High-temperature superconducting materials: Rare earth elements can be used to make high-temperature superconductors, which are used to make superconducting power generation equipment, magnetic levitation trains, etc. Environmental protection: Rare earth elements can be used to manufacture rare earth phosphor powder for energy-saving lamps, fluorescent lamps and other energy-saving and environmental protection lighting equipment.
2, the military field In the military industry, the addition of rare earth can greatly improve the steel used to manufacture tanks, aircraft, missiles,Tactical performance of aluminum alloy, magnesium alloy and titanium alloy. In addition, rare earth can also be used as electronic, laser, nuclear industry, superconductivity and many other high-tech lubricants.
3, rare earth is mainly used in military, metallurgical industry, petrochemical industry, glass ceramics, agriculture and so on. Military: rare earth is known as industrial "gold", because of its excellent photoelectromagnetic and other physical properties, can be composed with other materials of different properties, a wide variety of new materials, its most significant function is to greatly improve the quality and performance of other products.
4, the use of rare earth is very wide, mainly in high-techNew materials and other fields. Rare earth applications in the high-tech field Rare earth elements have an important position in the high-tech field because of their unique electronic structure and physical properties. For example, rare earth permanent magnet materials are widely used in the manufacture of electronic devices, wind power generation and electric vehicles. In addition, rare earth elements also play an irreplaceable role in optical fiber communication, laser technology and other fields.
Sensor is divided into thermal element, photosensitive element, gas sensitive element, force sensitive element, magnetic sensitive element, humidity sensitive element, sound sensitive element, radiation sensitiveTen kinds of components, color sensitive components and taste sensitive components. The first pztm wireless charging , the thermal sensor is a conversion device that converts temperature into electrical signals pztm wireless charging , which can be divided into active and passive two categories. The working principle of active power is pyroelectric effect, thermoelectric effect and semiconductor junction effect.
Types of sensors are: gas sensor, AC current sensor, acceleration sensor, ultrasonic sensor, Schke sensor and so on.
Sensor is a kind of detection, measurementAnd devices that convert specific physical or chemical quantities. Sensors can be divided into many types according to their functions and detection objects. Temperature sensor The temperature sensor measures and monitors temperature changes. They are widely used in various fields, such as industrial, medical and automotive. According to the different measurement principles, temperature sensors can be divided into thermal resistance sensors, thermocouple sensors, thermistor sensors and so on.
Can prevent errors or misactions caused by non-controlled infrared rays such as sunlight; 2) The PZT element has a piezoelectric effect at the same time, so the double element can eliminate the error caused by vibration; 3) It can prevent errors caused by changes in ambient temperature. Fresnel lens: In order to improve the receiving sensitivity of pyroelectric infrared sensors, it is usually necessary to install Fresnel mirror on the sensor.
The passive infrared alarm is characterized by being able to respond to the changes in infrared radiation caused by the intruder moving in the protected area, and can enable the monitoring alarm to generate an alarm signal, thusThe alarm function is complete. Figure 4 shows the schematic diagram of the working circuit of the alarm.
Principle: Infrared induction source usually uses pyroelectric elements, which lose charge balance when receiving human infrared radiation temperature changes, release charge outward, and the subsequent circuit can produce an alarm signal after detection and processing. Usage: Adjust the concentric ring and infrared probe have a proper focal length, infrared light is just received by the probe, the probe will light signal into an electrical signal into the electronic circuit to drive the load work.The working principle of the pyroelectric part is to use the radiant heat effect to make the detection element receiveThe radiation energy then causes the temperature to rise, which in turn changes the temperature-dependent performance of the detector. By detecting changes in one of these properties, radiation can be detected. In most cases, radiation is detected by thermoelectric changes. When the element receives radiation, causing a physical change in non-electric quantity, the corresponding electrical quantity change can be measured by appropriate transformation.
Passive infrared alarm is mainly composed of optical system, pyroelectric infrared sensor, signal filtering and amplification, signal processing and alarm circuit.
1, the main parameters of the dielectric are as follows: inductance: the size of the inductance, the number of turns of the main line, the winding method, there is no magnetic core and the material of the magnetic core, and so on. The greater the number of coils and the denser the coil wound, the greater the inductance. The inductance of a coil with a magnetic core is greater than that of a coil without a magnetic core. Allowable deviation: This parameter refers to the allowable error between the nominal inductance on the inductor and the actual inductance.
2, only when the frequency is zero or the frequency is very low (such as 1 KHZ), the three microscopic processes are involved, then the dielectric constant ε (0) for a certain electricityThe dielectric is a constant, generally known as the dielectric constant, which is also the electrostatic dielectric constant εs or low frequency dielectric constant.
3, gas dielectric materials include non-polar gases (such as He,,, and), extreme gases (such as HCl, NO, etc.), and some mixed gases such as air, of which the most commonly used is the natural gas medium.
4, assess the energy storage capacity: For electronic devices such as capacitors, the dielectric constant determines its ability to store charge. A higher dielectric constant means that the material can store more electrical energy. Influence signal transmission: In the field of electronic communication, dielectric constant shadowThe transmission speed and quality of the sound signal. Therefore, understanding the dielectric constant of materials is essential for designing and optimizing electronic devices.
5, the dielectric constant (Dk), as a core indicator of dielectric properties, measures the ability of a material to store charge compared to vacuum or air. It plays a decisive role in capacitor design and material selection, such as organic materials such as foamed polyethylene (Dk=6) and fluoropolymer (Dk=0), each with different electrical energy storage properties.