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From the look of aircraft vibration vibration specification buzzer

At present, many domestic aircraft instruments are checked at the buzzer for debugging and (or stand) on. The piezo buzzer is a simple micro-vibration equipment, vibration specification is followed Soviet standards. There is currently some other aircraft guidance of electrical and mechanical devices are debugging and checking on the buzzer. Vibration specification also borrow these technical specifications buzzer buzzer aircraft instruments. Previously, the existence of some controversy on the vibration piezoelectric buzzer. To further understand the vibration of the aircraft control panel on the MiG -19 and -21 aircraft ground test

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Multi-sensor data fusion technology and its application

ultrasonic sensors data fusion technology is a new cutting-edge technology. In recent years, multi-sensor data fusion technology has attracted widespread attention, its theories and methods have been applied to many research fields. Discusses the basic concept of multi-sensor data fusion, working principle, characteristics and structure data fusion, data fusion method and piezo buzzer applications, and summarizes the current research data fusion main problems existing in its development trend.

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Research polarization maintaining fiber coupler analysis and production methods

FOG, such as coherent fiber optic hydrophone sensors used in military and civilian fields more and more widely, so that their performance requirements will become increasingly high. Wherein the optical rebar coupler are the core components of the fiber optic sensors, a significant impact on the performance of the overall performance of the optical fiber sensor. Currently rebar connect is made mainly of single-mode fiber, this coupler fabrication process is simple, low cost, however, because it does not have a polarization-maintaining function, external disturbances caused by birefringence optical fiber sensor will cause zero drift and signal fading, resulting in unstable performance of the coupler.

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Fused tapered plastic optical fiber coupler

Plastic optical fiber has a large size, the advantages of light weight, easy to make, inexpensive, plasticity, such as quartz fiber is no easy construction, it became the preferred material of plastic optical fiber FTTH. To match the plastic optical fiber network, a redistribution of the optical signal to be developed plastic optical fiber rebar coupler. Our project "Plastic Optical Fiber Coupler" is proposed to achieve this objective, it is in support of the provincial Science and Technology Commission and the National Natural Science research projects carried out under the Fund. First, this paper introduces the optical waveguide coupling theory, the performance of a variety of optocouplers, production methods and their advantages and disadvantages, and to determine to produce molten plastic pull taper thread coupler as a target.

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Autonomous mobile robot based on ultrasonic sensor detection system

Along the wall for autonomous mobile robot navigation process to design a transceiver ultrasonic detection system consisting of ultrasound sensor and stepper motors. Describes the structure and design of the hardware and software of this system. Experimental summarize the impact of the ultrasonic beam and the target size of the angle of incidence ranging stability proposed search method from the nearest point on the wall and applied to ultrasonic transducer itself pose correction, and extended to the environment to detect mobile robot. 

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Vanadium and niobium-generation performance of the production Ⅲ grade steel

Dragons introduced on behalf of the company niobium vanadium production Ⅲ grade steel product technology trial production. In the pilot phase, through the reinforcement of the tested chemical composition, mechanical properties and microstructure analysis to clarify the different processes impact on rebar splice coupler, The optimum solution. In the production stage, through a large number of statistical and qualitative data analysis, focusing on the low tensile strength and rebar couplers yield no significant analysis of the phenomenon, and the corresponding measures for improvement.

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Continuous buzzer circuit power

Figure 1 shows the continuity of the detector circuit is in piezo buzzer"Fleapower circuit detects short circuits (a micro-power circuit can detect a short circuit fault)" (EDN, July 2, 1998, p 122) on the basis of the article. Buzzer indicating the way allows us to focus undivided attention on quality checking circuit connections

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Continuous buzzer circuit power

Figure 1 shows the continuity of the detector circuit is in piezo buzzer"Fleapower circuit detects short circuits (a micro-power circuit can detect a short circuit fault)" (EDN, July 2, 1998, p 122) on the basis of the article. Buzzer indicating the way allows us to focus undivided attention on quality checking circuit connections

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High temperature corrosion inhibitor for steel corrosion resistance impact study

Developed a high anti-rust agent, by impregnating the high-temperature steel rust agent, to rebar coupler the steel rolling process after the rapid water cooling. Accelerated salt spray corrosion test carried out and electrochemical experiments to compare the high-temperature corrosion inhibitor SG dealing with stamping coupler cooling treatment rebar corrosion resistance. Salt spray test shows that, SG rust appeared the first sample time is shorter, and continuous corrosion after 120h, corrosion weight less, exhibit good resistance to salt spray performance; electrochemical experiments analysis, comparing different parts of the steel (substrate surface, horizontal ribs and vertical ribs) SG than the corrosion potential of the sample is positive, and the corrosion current density. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) method, we study two kinds of treatment under the oxide scale microstructure and surface structure, and its corrosion resistance mechanism has also been discussed. The results showed that: high-temperature treatment rebar rust SG dense layer formed on the surface of Fe3O4-rich oxide complete passivation film, increasing its normal temperature corrosion resistance.

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Can realize automatic control of automatic forging machine backgauge

Proposed a new forging machine forging machines stoppers organizations can realize automatic control.

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The principle of the ultrasonic sensor

This paper introduces the concept of ultrasound, features, elaborated the principle of ultrasonic sensors, ultrasonic sensors and analyzed in the medical, industrial, liquid level measurement, alarm and other applications. Ultrasound has the unique properties, making ultrasonic sensors in the production life reflects the growing importance of having a certain value.

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Polymer waveguide grating coupler design studies

Waveguide grating coupler is etched grating in the waveguide, the light coupled through the grating surface of the output from the waveguide into the fiber, or the optical fiber coupled into rebar coupler of the device. Compared with coupling waveguide end, this coupling approach has flexibility, packaging and low difficulty. Polymers are attracted widespread attention in recent years, a new type of waveguide material having good compatibility, simple preparation, flexibility and other characteristics, good prospects for development. In rebar splicing coupler, simulation and experiments using Dalian University of Technology Polymer Photonic Labs research and development PSQ series of polymeric materials.

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Piezo Buzzer

Element used in the past mainly mechanical alarm buzzer sounding body which is inexpensive, but because Piezo Buzzer is audible by contact against metal, so wear of the contact determines the life of alarms, continuous working life generally only 50 hours. corrosion and other problems also exist, their use is very restricted. with integrated circuits, large scale integrated circuits, electronic devices also requires miniaturization, high-class, multi-functional so and the development of the electronic beep makers. electronic buzzer is characterized by small size, light weight, thin size, low power consumption, no noise, long life, high reliability and sound good, and thus has been the rapid development and wide application. siren can be divided into cell phone speaker and his self-excitation type laser type.

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Simple homemade cable conduction buzzer

Aircraft cable is done in the production process and after the conduction must be checked to ensure that the piezo buzzer is correct. In the past, when conduction testing, the use of lighting, with three tables or bell indicates the line as the correct signal. But the use of these types of signals has shortcomings, with lights and three tables for signal, very convenient in use, the eyes must look at the buzzer piezo, but also depends on the light (or hands), distraction; bells price is expensive, but mainly too loud signals, interference people, and if there are several groups are simultaneously turned on, even more serious interference.

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Fiber coupler theory, design and progress of

Summed up the fiber rebar couplers system development process, summarize various stages extracted landmark event; elaborated fiber coupler coupling types, production methods, performance parameters; detailed commentary of the fiber rebar connection theoretical analysis methods; comprehensive analysis of the X-type, star, raster, hybrid fiber couplers and other typical basic structure, working principle and coupling characteristics; Identify and prospect of the development direction of the optical fiber coupler and application prospects. On first proposed and designed long period fiber grating coupler, experimentally realized between two long-period fiber grating effective coupling.

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Resonant frequency ultrasonic transducer

Currently the resonant frequency tracking technology are basically using hardware tracking method. PI digital control has been widely used in industrial closed-loop system, but there are rare PI control in ultrasonic transducer applications on automatic frequency tracking. The resonant frequency of the transducer is generally very high, usually in magnetic transducer of one or more of the hardware chip and a sampling circuit and a digital control system brings high requirements. With DSP, FPGA, etc. The emergence of high-performance chips, making the ultrasonic transducer digital, intelligent control become a reality.

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Adjust the vibration of the instrument with a buzzer specification

At present, many aircraft instruments are at the buzzer on magnetic buzzer and check. Buzzer is a simple micro-vibration equipment. The vibration specification is followed former Soviet Union standards. There is currently some aircraft guidance electrical and mechanical instruments also buzzer debugging and inspection; while its vibration specification is borrowed aircraft instrument buzzer specifications. The past on the buzzer vibration specification exists some controversy. To piezo buzzer the aircraft control panel vibration, we MiG-19 aircraft to the interview and 21 car vibration tests carried out, whereby the vibration specifications for the buzzer has been further understanding.