Large-load broadband power flow measuring device

Abstract

The invention provides a large-load broadband power flow measuring device. The device comprises an upper plate, a middle plate and a lower plate, wherein an acceleration sensor is solidified in a mounting groove in the middle of the upper plate, so that no pressure is born; the upper surface and the lower surface of a force sensor are contacted with surfaces of the upper plate and the lower plate respectively; the upper plate, the middle plate and the lower plate are connected with one another by using screws; and wires of the acceleration sensor and the force sensor are led out of notches on the upper plate and the middle plate respectively. Through the device, transfer force passing through machine legs and acceleration can be simultaneously measured, so that origin impedance of the device is obtained, and a power flow of the machine legs can be more accurately measured by a direct method. Since the acceleration sensor is solidified in the circular mounting groove in the middle of the upper plate, no pressure is born. Piezoelectric crystal which can bear pressure of more than 5 tons is used by the force sensor, so that the device can be arranged on a heavier machine leg.

Description

technical field [0001] The invention relates to a combined sensing device which can simultaneously measure the force and acceleration passing through a machine foot and can be used in conjunction with a vibration isolator. Background technique [0002] With the development of technology, power flow method and power flow as an evaluation index of vibration are more and more used in engineering practice due to their own superiority. However, the accurate measurement of the origin impedance and the transmitted power flow of the machine feet has always been a problem that plagues vibration research. [0003] Since the 1970s, under the leadership of Fahy, Noiseaux, Pavic, White, etc., the research on power flow of structural vibration has been gradually in-depth research, from the energy transfer research in beams and plates to complex structures such as ribbed cylindrical shells and hull structures. A lot of results have been achieved. [0004] In 1980, H.G.D.Goyder and R.G.Wh...

AI Technical Summary

Problems solved by technology

[0012] There are generally two types of force sensors: piezoelectric and strain-type. The measurement frequency band of the strain-type force sensor is narrow. At the same time, the stiffness of the strain sensor is small, which is easy to damage the contact impedance of the structure under test, resulting in a large test error.

Images