Abstract: The present disclosure provides a voice prompt system, a voice prompt method for a bridge girder erection unit, a computing device, and a medium. The voice prompt system includes a control circuit and an alarm circuit; the control circuit includes a control power supply, a programmable controller, and relays; the positive electrode of the control power supply is electrically connected with an input end of the programmable controller, an output end of the programmable controller is electrically connected with input ends of the at least two relays, respectively, and output ends of the relays are connected to the negative electrode of the control power supply after being connected in parallel; the alarm circuit includes relay contacts, a wiring terminal block, and an alarm; the wiring terminal block includes at least two high-potential pins and a low-potential pin.

Abstract: The invention discloses a calculation method for dynamic fluid loss of acid-etched fracture considering wormhole propagation, which is applied to pad acid fracturing process, comprising the following steps: Step 1: dividing the construction time T of injecting acid fluid into artificial fracture into m time nodes at equal intervals, then the time step ?t=T/m and tn=n?t, where, n=0, 1, 2, 3, . . . , m, and to is the initial time; Step 2: calculating the fluid loss velocity vl(0) in the fracture at t0; Step 3: calculating the flowing pressure distribution P(n) in the fracture at tn; Step 4: calculating the width wa(n) of acid-etched fracture at tn; Step 5: calculating the wormhole propagation and the fluid loss velocity vl(n) at tn; Step 6: substituting the fluid loss velocity vl(n) into Step 3, and repeating Step 3 to Step 6 in turn until the end of acid fluid injection.