Experimental Study On Mechanical Characteristics Of Vehicle-mounted Live Fish Transportation

In this paper,We took the common freshwater fish as our research target and built the system of impact information collection and simulated the vehicle vibration on the shaking table to study the influence under different vibration frequencies suffered on the fish.Besides,the live fish carried by vehicles for transformation was also performed and we also tried to collect the force value through different kinds of fish under different kinds of working conditions.After that,the processing technique for application engineering test signal was used for preliminary handing of force value,in the meaning,for extracting the mechanical characteristics.A significance analysis method was used to study the affinity between vehicles under different running statues and force value of different kinds of fish and we tried to build a mode for force value of live fish carried by vehicles using regression equation.The brake force value curve was fitted to the the fitting and the fitting parameters are optimized by the classical algorithm.Software ANSYS/LS-DYNA was used to simulate the collision process of vehicle braking of the live fish transporting box and fish body.The main results are as follows:1.Effects of load and vibration frequency on the fish box impact test board by the maximum stress and the surface of the amplitude of the fish tank:(1)With the fish tank loading increased,the maximum force value increased,the amplitude decreased.When the fish tank water loading were 60%,70%,80% and 90%,the maximum stress values were 37.86 N,48.23 N,55.6 N and 99.36 N,the amplitude was 20 cm,18cm,12 cm and cm 6 and the corresponding vibration frequencies were 30 Hz,28 Hz,24 Hz and 23 Hz.(2)The 23～30 Hz is the natural frequency of the vibration frequency range of the four fish tank loading capacity,road transport vibration energy is mainly distributed at0～200 Hz,the 0～20 Hz frequency range of energy is most concentrated natural frequency range and the four fish tank load close,therefore in the live fish transportation process in order to avoid the resonance phenomenon to achieve the above,should try to prevent the natural frequency range,can improve the loading capacity of the fish tank to reduce the vibration amplitude of the water and fish and fish tank.2.Study the mechanical characteristics of different fish transport running condition(1)The vehicle live fish transportation tests under different road conditions and vehicle conditions conditions,according to the force value and choice to extract the rising slope changes,descending slope,maximum span,minimum span,impulse acceleration,deceleration impulse,the maximum stress value,stress characteristics to characterize the process of fish fish transportation vehicle the maximum force value 8 a mechanical characteristic of different kinds of fish under different experimental conditions.(2)Different vehicle state mechanical characteristics were analyzed,results show that,at the 0.05 significance level,the species of fish significantly influence the deceleration impulse,the maximum stress,the maximum stress value,because of individual fish size and different level of activity Different,the linear acceleration and deceleration driving fish by the maximum force value is between 14.21～29.69 N,with slow moving fish by the maximum force value between15.78～35.38 N,the biggest fish circle driving force value between 25.09～133.97 N,with the increase of individual fish,activity increased,the maximum force is affected by the different vehicle speed increases.Significantly affect the maximum span,minimum span,acceleration impulse,the maximum force value.The linear acceleration and deceleration driving by the maximum force value between 17.93～28.03 N,a deceleration by the maximum force value is between 21.66～51.25 N with the road,with the vehicle speed Increases,can be used to establish vehicle model.The mechanical characteristics of live fish transportation circle driving by the maximum force of fish was the greatest impact,with slow time.In view of this,we should pay attention to the driving strategy at the turn of the vehicle to reduce stress,improve the quality of transport.(3).Prediction model using the method of linear regression was established on peak force and deceleration impulse fish transportation,with good predictability and stability,the optimization,different fitting function of brake force value curve fitting and the fitting parameters of different methods showed that the Gauss function fitting the effect is better and the fitting parameters through particle swarm optimization after the highest accuracy,on different speed and different species of linear acceleration and deceleration driving brake force value curve fitting of fitting function parameters represent the physical meaning,analyses the different influence of the speed,the species of fish of various parameters,theoretical analysis on the stress situation brake,close to the theoretical value and the measured value,the error is less than 15.99%.3.The finite element simulation model of fish box and crucian carp was established.The stress nephogram of fish box and fish under different initial speed of 40 km/h,60km/h and 80 km/h was analyzed.(1)The maximum equivalent stress of fish box at different initial speeds is 4.382 MPa,8.917 MPa,11.548 MPa,and the higher the initial braking speed,the greater the equivalent stress of fish box,and the maximum equivalent stress of fish box takes place on the surface of the direction of movement(2)The fish body between the maximum equivalent stress were 0.376 MPa,3.54 MPa,8.598 MPa,the initial braking speed is higher,the collision between the equivalent stress of the big fish,the fish body between the maximum equivalent stress occurs in the tail fins,fish body parts,uniform stress and relative fish fin.Small fish.(3)The vehicle braking test and simulation results of live fish transportation maximum power braking of carp value changes with the velocity is the same,the higher the speed,the maximum braking force value is greater,the error of the simulation results and the experimental results is less than 19.96%.