汽车起重机的变幅抖动问题

doi:10.13229/j.cnki.jdxbgxb.20240584

Abstract

Abstract:

In response to the problem of luffing vibration in automotive crane， firstly， this article analyzes the causes and mechanisms of luffing vibration based on the principle of luffing vibration hydraulic system and the dynamics of luffing mechanism. Then， on-site tests were conducted on normal and shaking hosts， and time-frequency analysis methods were used to reveal the differences in test signal characteristics under different amplitude changes. Quantitative evaluation indicators for amplitude change shaking phenomena were developed. Finally， the quantitative evaluation index of luffing vibration was extended to the oil cylinder factory inspection test bench， and the factory test method for luffing vibration was established. The research results indicate that excessive internal friction force in the luffing oil cylinder is the main cause of crane luffing vibration； the vibration acceleration signals of normal and shaking hosts have obvious characteristic differences， which can be used as the quantitative evaluation index for luffing vibration phenomenon； the improved oil cylinder factory inspection test bench has good consistency between the test results and the host test results， and can achieve pre detection of luffing vibration phenomenon.

Key words: truck crane, luffing vibration, time-frequency analysis, quantitative characterization, factory inspection

CLC Number:

TG213

Jin-shi CHEN,Tong-yang WANG,Ru-heng SHANG,Yong-qi LI,Dong-yang HUO,Xi CHEN. Problem of luffing vibration in truck crane[J].Journal of Jilin University(Engineering and Technology Edition), 2026, 56(1): 44-53.

Figures/Tables 18

Fig.1

Fig.2

Fig.3

Fig.4

Table 1

Time domain eigenvalue"

时域特征	计算公式
平均值	$s ˉ = 1 N ∑ i = 1 N s i$
标准差	$ρ t = 1 N ∑ i = 1 N (s i - s ˉ) 2 12$
峭度	$1 N ∑ i = 1 N (s i - s ˉ) 4 ρ t 4$
最大值	$s m a x$
最小值	$s m i n$
峰峰值	$s m a x - s m i n$
均方根	$R M S = (1 N ∑ i = 1 N s i 2) 12$
峰值因子	$s m a x / R M S$
波形因子	$R M S / 1 N ∑ i = 1 N s i$
脉冲因子	$s m a x / 1 N ∑ i = 1 N s i$

Table 1

Fig.5

Fig.6

Fig.7

Fig.8

Fig.9

Fig.10

Fig.11

Table 2

Fig.12

Fig.13

Fig.14

Table 3

Fig.15

References 22

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项目		最大值	最小值	RMS	峭度	波形因子	峰形因子	脉冲因子
正常	轴向/g	0.058	-0.066	0.012	3.445	1.280	5.334	6.829
正常	径向/g	0.132	-0.127	0.026	3.444	1.291	5.128	6.620
抖动	轴向/g	0.459	-0.324	0.056	7.522	1.570	8.270	12.984
抖动	径向/g	0.332	-0.303	0.043	5.203	1.380	7.667	10.582

项目		最大值	最小值	RMS	峭度	波形因子	峰形因子	脉冲因子
正常	轴向/g	0.058	-0.066	0.013	3.176	1.162	3.172	3.528
正常	径向/g	0.051	-0.050	0.008	3.830	1.194	3.057	3.840
抖动	轴向/g	0.422	-0.553	0.148	4.923	1.512	5.751	5.671
抖动	径向/g	0.156	-0.148	0. 201	5.009	1.353	7.419	10.040

Problem of luffing vibration in truck crane

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