Worktable type electronic impact hammer

Abstract

The invention discloses a worktable type electronic impact hammer. The worktable type electronic impact hammer is characterized by comprising a worktable, a controller, a trigger and a direct-current power supply, wherein the controller and the trigger are respectively connected with the direct-current power supply; the controller is respectively connected with the trigger and an actuator; the actuator comprises a traction type electromagnet; an iron core extending part of the electromagnet is connected with a force sensor; an impact head with a protecting function is arranged at the front end of the force sensor; and the electromagnet is arranged on a platform of the worktable. The repeatability and the adjustability of impact force are guaranteed, the time for contact between the hammer and a mechanical structure to be measured is controlled reliably so as to obtain ideal force pulse, and the worktable type electronic impact hammer is particularly applied to modal analysis, automatic impact testing and finite element analysis (FEA) modal verification of the mechanical structure.

Description

technical field [0001] The invention relates to a hammer device for hammering modal tests, in particular to a bench-type electronic impact hammer which can generate repeatable and variable impact force by adjusting pulse time through a BCD switch. Background technique [0002] The experimental modal analysis method is used to measure the dynamic characteristics of the mechanical structure, and its purpose is to obtain the natural frequency, mode shape and modal damping of the structure, so as to perform transient dynamic simulation or harmonic response analysis of the mechanical structure. [0003] Modal tests often use the hammer method. The hammering method is to hit (that is, excite) the mechanical structure to be tested by using an impact hammer equipped with a force sensor, and obtain the mechanical properties of the mechanical structure with the help of modal testing technology and fast Fourier transform (FFT) with the principle of pulse test and modal theory. Methods...

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problems existing in the prior art that the size and direction of the hammer force are difficult to keep consistent, the excitation time is difficult to control, the repeatability is poor, and it is difficult to excite ideal force pulses; to provide a workbench type electronic impact force Hammer; ensure the repeatability and adjustability of the impact force, reliably control the contact time between the hammer head and the mechanical structure under test to obtain an ideal force pulse, especially for modal analysis of mechanical structures and automatic impact testing and FEA model validation

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