ã€ALUMINIUM NETWORK】There are currently more than 1,000 aluminum alloys that have been officially registered in the world, and 450 are more commonly used. They are included in the 1xxx to 9xxx series, making tremendous achievements in the development of the world economy and the progress of human civilization. contribution. However, with the advancement of science and technology, the modernization of the national economy and the defense industry, and the improvement of people’s living standards, some alloys have been phased out. It is urgent to develop a group of high-strength, high-tenacity, high-die, low-shrinkage, wear-resistant, and corrosion-resistant materials. , fatigue resistance, high temperature resistance, low temperature resistance, radiation resistance, fire protection, explosion-proof, easy cutting, easy polishing, surface treatment, weldable and ultra-light new alloy. Such as 6b ≥ 750MPa high-strength high-toughness alloy, density less than 2.4 aluminum-lithium alloys, powder metallurgy and composite materials.
In recent decades, aluminum alloy materials have generally developed in the following two directions: (1) The development of new high-performance aluminum alloy materials, such as high strength, high toughness, etc., to meet the needs of aerospace and other military industries and special industrial sectors. (2) Develop a series of new civilian aluminum alloy materials that can meet various conditions. Thanks to the efforts of all parties, gratifying results have been achieved, and a series of new alloys and new materials have been developed to bring the aluminum alloy materials and their processing industries to a new level.
The vibration sensor(Vibration Transmitter) is one of the key components in the testing technology of Vibration Measurement. Its main function is to receive the mechanical quantity and convert it into a proportional electric quantity. Because it is also an electromechanical conversion device. So we sometimes call it a transducer, a vibration pickup, etc.
Commonly used vibration sensors are as follows:
1. Piezoelectric resonant
The piezoelectric sheet is used to receive the vibration signal, and the resonance frequency of the piezoelectric sheet is relatively high. In order to reduce the resonance frequency, it is realized by increasing the mass of the piezoelectric sheet vibrating body, and using a spring ball instead of an appendage to reduce the two resonance frequencies and enhance the vibration effect. Its advantages are high sensitivity and simple structure. However, the signal needs to be amplified and sent to a TTL circuit or a single-chip microcomputer circuit, but it is enough to use a triode single-stage amplification
2. mechanical vibration
In the traditional vibration detection method, after being vibrated, the spring ball vibrates at a reduced amplitude for a long time, and this vibration is easy to be detected by the detection circuit. The vibration output switch signal is determined by the output impedance and the resistance value of the matching output. According to the input impedance of the detection circuit, it can be made into a high-impedance output mode.
3. Micro Vibration Sensor
The mechanical vibration sensor is miniaturized, the vibration body is carbonized and sealed, and its working performance is more reliable. The output switching signal is directly connected with the TTL circuit and or the input circuit of the single-chip microcomputer, and the circuit structure is simple. The output impedance is high, and the quiescent working current is small.
Advantages of Vibration Sensors
1. Small size and light weight. It can be applied to some vibration test systems that are greatly affected by the additional mass.
2. It has a wider response frequency range of 4Hz-2000Hz than the magnetoelectric speed sensor, and the mechanical moving parts are not easy to damage
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