一种新型振动弛张筛的多自由度动力学响应计算与实验验证

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振动与冲击 ›› 2023, Vol. 42 ›› Issue (15) : 48-54.

论文

刘初升1，武继达2，李赛1，何德艺1，娄云利3

作者信息 +

Calculation and test verification for multi-DOF dynamic response of a new type of vibrating flip-flow screen

LIU Chusheng1, WU Jida2, LI Sai1, HE Deyi1, LOU Yunli3

Author information +

文章历史 +

摘要

振动弛张筛可有效解决潮湿细粒煤炭的干法筛分问题，是煤炭清洁高效分选的重要工艺装备。本文提出了一种具有弹性摆杆结构的新型振动弛张筛。为了研究该结构的力学性能，利用修正混合阻尼模型来描述弹性振动结构的动态恢复力。考虑到弹性摆杆结构的频变和幅变特性，通过中心复合试验设计，构建反映弹性振动结构的特征参数与振幅、频率关系的响应面近似模型，通过方差分析发现弹性振动结构刚度非线性受制于振幅平方与频率，阻尼特性受振幅与频率共同影响。提出了弹性摆杆振动弛张筛的4自由度幅频变动力学模型和计算框架，并通过数值计算获得了不同参数下的稳态响应。最后，对新型振动弛张筛样机进行多频点振动测试，主方向平均误差为2.12%和7.26%，验证了理论计算的正确性，为振动弛张筛的设计提供了新的思路。

Abstract

Vibrating flip-flow screen can effectively solve the problem of dry screening of wet fine coal and it is indispensable for clean and efficient separation of coal. In this study, a novel vibrating flip-flow screen with elastic oscillating structure (VFFSEOS) was presented. Moreover, the modified hybrid damping model was used to describe elastic oscillating structure dynamic resilience to investigate the mechanical performance. Considering the frequency and amplitude change characteristics of the elastic oscillating structure. The response surface model was established between characteristic parameters of elastic oscillating structure and amplitude, frequency by central composite experiment design. Through variance analysis, it is found that the nonlinear stiffness of elastic vibration structure is controlled by the square of amplitude and frequency, and the damping characteristic is affected by the true poison and frequency. A 4-degree-of-freedom amplitude-frequency dynamic model and calculation framework of elastic pendulum vibrating flip-flow screen are presented, and steady-state responses under different parameters were obtained by numerical calculation. Finally, the multi frequency vibration test is carried out on the prototype of the new vibrating relaxation screen, and the average error in the main direction is 2.12% and 7.26%, which verifies the correctness of the theoretical calculation and provides a new idea for the design of the vibrating relaxation screen.

导出引用

刘初升1，武继达2，李赛1，何德艺1，娄云利3. 一种新型振动弛张筛的多自由度动力学响应计算与实验验证[J]. 振动与冲击, 2023, 42(15): 48-54

LIU Chusheng1, WU Jida2, LI Sai1, HE Deyi1, LOU Yunli3. Calculation and test verification for multi-DOF dynamic response of a new type of vibrating flip-flow screen[J]. Journal of Vibration and Shock, 2023, 42(15): 48-54

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