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Piezoelectric stack with its large output force and small displacement, which cannot satisfy the requirement of the opening of the cone valve core of the actual situation. A piezoelectric hydraulic principle of the hydraulic actuators based on displacement amplification was put forward, the output displacement and piezoelectric stack driving volt length, area and enlarge the structure dimension parameters...
Structure static testing is an important means to study the static characteristic of complex engineering structure. Electrohydraulic stactic loading system is the singnificant equipment of the testing. With its function of transfering low-power electrical singal to large-power hydraulic output quickly and precisely, the servo valve plays a key role in an electrohydraulic servo control system and dominates...
An excitation means of electrohydraulic vibrator is proposed and aimed to enhance the working frequency. The vibrator is a symmetrical hydraulic cylinder controlled by a 2D valve, in which both rotary and linear motions of a single spool are used to vary the frequency and the amplitude independently. The frequency of the vibrator is proportional to the rotary speed of the spool and thus the high-frequency...
Cable force testing techniques which based on fiber Bragg grating (FBG), namely, FRP smart tendon, FBG vibration sensor and FBG force-testing ring, etc, have been widely used in bridge cable long-term safety monitoring. Except for FRP smart tendon, the other two FBG-based cable force sensors have already possessed some mature engineering application examples. In view of the installation manner of...
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