Fuzzy Reliability Analysis and Optimization Design of Hydraulic System of Bale Carrier for Tie Arm Device

doi:10.23940/ijpe.19.02.p7.416430

Abstract

Abstract:

In order to realize the vertical and horizontal arrangement of square bales, the tie arm device adopts position feedback and hydraulic two-way lock loop for position control and position locking. The corresponding simulation model is established with AMESim software to verify the correctness of the model and to study the characteristics of the hydraulic control system. The fuzzy Failure Mode Effects and Criticality Analysis (FMECA) method is applied to the hydraulic system. According to the results of the hazard degree evaluation, the order of the hazard grade of each failure mode of the hydraulic system components is obtained and can be used for the reliability improvement and maintenance of the hydraulic system. The hydraulic control system is optimized by adjusting the parameters of several important influencing factors.

Key words: horizontal push device, hydraulic system, AMESim, fuzzy comprehensive evaluation, FMECA

Chenghui Pei, Xingyan Liu, Zhigang Liu, Tong Zhang, and Guoliang Li. Fuzzy Reliability Analysis and Optimization Design of Hydraulic System of Bale Carrier for Tie Arm Device [J]. Int J Performability Eng, 2019, 15(2): 416-430.

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Figures/Tables 18

Figure 1

Figure 2

Figure 3

Table 1

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Table 2

AHP judgment matrix scale and its meaning"

$a ij$	Meaning
1	$u i is as important as u j$
3	$u i is slightly more important than u j$
5	$u i is obviously more important than u j$
7	$u i is more important than u j$
9	$u i is more important than u j$
one of 2, 4, 6, 8	$T he importance of u i to u j is between the$ $equivalents$

Table 2

Table 3

IR values of 1-13 order judgement matrix"

n	$I R$	n	$I R$
1	0.00	8	1.41
2	0.00	9	1.45
3	0.58	10	1.49
4	0.90	11	1.52
5	1.12	12	1.54
6	1.24	13	1.56
7	1.32

Table 3

Table 4

Hydraulic control system five parts FMECA table"

Product name	Sequence Number	Failure mode	Cause of issue	Local effects	High level impact	The final impact	Severity level	Take measures
Servo	1	Slow response, slow response	Reduced oil pressure	Cylinder instability	Corresponding push, dial action instability	Tie arm device stacking quality decline	Ⅲ level	Increase the pressure of oil supply
Servo	2	Vibration appears	The system gain is too high	Cylinder instability	Corresponding push, dial action instability	Tie arm device stacking quality decline	Ⅱ level	Reduce system gain
Hydraulic Cylinder	3	Leakage	Seal failure	Cylinder lack of thrust	Corresponding to push, dial performance decline	Tie arm device stacking quality decline	Ⅲ level	Replace the seal
	4	Internal leakage	Seals wear	Cylinder instability	Corresponding to push, dial performance decline	Tie arm device stacking quality decline	Ⅲ level	Replace the seal
	5	Crawl	Hydraulic cylinder accumulates air	Cylinder instability	Hydraulic cylinder life is reduced	Tie arm device stacking quality decline	Ⅲ level	Exhaust the air
	6	Lack of thrust	Frictional resistance is too large	Reduced effective traction cylinder	Corresponding push, dial action instability	Tie arm device stacking quality decline	Ⅲ level	Adjust the cylinder and piston with the gap
Check valve	7	Oil is not countercurrent	Check valve stuck	Valve does not work	Corresponding push, dial no corresponding action	Tie arm device to stop working	Ⅱ level	Demolition, cleaning valve
Directional valve	8	Commutation is not reliable	Spring deformation fracture	Cylinder instability	Corresponding push, dial action instability	Tie arm device stacking quality decline	Ⅱ level	Adjust the gap
Directional valve	9	Commutation moves slowly	Poor lubrication	Change the valve function	Corresponding push, dial action instability	Tie arm device stacking quality decline	Ⅲ level	Adjust the viscosity of the lubricant
Pipeline	10	Pipeline blocked	Oil pollution	Inadequate supply of oil	Cylinder instability	Tie arm device stacking quality decline	Ⅳ level	Filter oil impurities

Table 4

Table 5

Factor ranking table"

Influencing factors	Grade
Influencing factors	1	2	3	4
Failure probability level ( $u 1$ )	rarely happens	occasionally	occasionally happens	happens very often
Severity level ( $u 2$ )	slight influence	medium effect	tremendous influence	deadly impact
Detection level of difficulty ( $u 3$ )	accurate detection	not easy to detect	hard to detect	unable to detect
Maintenance level of difficulty ( $u 4$ )	simple debugging	re-install	replace parts	unable to repair

Table 5

Table 6

Failure mode 1 the relative importance and weight of each influencing factor"

Influencing factors	$u 1$	$u 2$	$u 3$	$u 4$
$u 1$	1	3	7	5
$u 2$	1/3	1	5	3
$u 3$	1/7	1/5	1	1/3
$u 4$	1/5	1/3	3	1

Table 6

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Parameters	Unit	Value
Fuel flow	L/min	35
Safety valve opening pressure	MPa	10
Hydraulic oil temperature	Degc	40
Hydraulic oil density	kg/m³	850
Directional valve to open the current	Ma	200
Directional valve natural frequency	Hz	50
Gain signal 1 value		10
Gain signal 2 value		250
Control valve core displacement limit	M	±0.0045
Control spool damping	N/m/s	1000
Conical valve taper	Degree	60
One-way valve core quality	kg	0.068
Check valve limit displacement	M	±0.00628
One-way valve core spring stiffness	N/mm	130
Horizontal push cylinder piston rod diameter	mm	56
Horizontal push hydraulic cylinder diameter	mm	80
Displacement sensor output signal gain	1/m	10

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