Hydraulic Hose Research Articles

Analisis Perawatan pada Unit Dump Truck FMX 440 Kapasitas 30 Ton dengan Metode Reliability Centered Maintenance (RCM)

One of the coal mining activities is to move coal from pit to rom using transport equipment, namely dump trucks. In the case study in the field, the dump truck used is FMX 440 with a capacity of 30 tonnes which operates for 18 hours/day. The obstacles or problems encountered during operations include damage and disruption to the dump truck unit system, which can interfere with the mining process and result in a reduction in the amount of coal production targeted by the landowner. Therefore, other methods are needed so that maintenance can be planned and carried out properly. This research aims to find critical components, and maintenance intervals on dump trucks. This research uses the reliability centreed maintenance (RCM) method. The results obtained are critical components, MTBF and MTTR values are cooling system 5,011.96 hours and 1.44 hours, transmission (T / M) system 14,446.24 hours and 2.75 hours, hydraulic oil hose and piping 22,326 hours and 10.54 hours, and air piping and hose 17,541.86 hours and 4.86 hours. From the calculation of the reliability value of critical components, the maintenance time interval for each component is obtained, namely the cooling system is carried out maintenance after 138 operating days, the transmission (T / M) system is carried out maintenance after 416 operating days, hyd. oil hose & piping is carried out maintenance after 638 operating days, and air piping & hose after 500 operating days.

Modelling and experimental validation of an adaptive interconnected suspension with adjustable roll stiffness (AIS-ARS)

Vehicle suspensions play a critical role in improving vehicle stability and ride quality, especially in heavy vehicles that usually have high centre-of-gravity and carry tons of cargo. Interconnected suspension systems, in which the suspension struts are connected through hydraulic hoses and flow control devices, have great potential to enhance vehicle handling stability and attenuate vibrations. This study introduces an adaptive interconnected suspension with adjustable roll stiffness (AIS-ARS) to address the shortcomings of existing designs. It not only eliminates the conventional anti-roll bars but also enables adjustment of roll stiffness depending on the driving and vehicle load conditions. The AIS-ARS system uses a unique design that avoids using expensive electro-proportional flow control valves, which has been a significant barrier to widespread implementation. Instead, the system utilises a cost-effective control strategy that uses only two solenoid valves to achieve adaptive damping. The mathematical modelling of the AIS-ARS is also straightforward, requiring less computational power and making it more practical for real-time implementations. Overall, the AIS-ARS system represents a significant advancement in the design of interconnected suspension systems, offering a more cost-effective, practical, and versatile solution. The above features are validated through laboratory experiments and co-simulation between MATLAB/Simulink and ADAMS/Car.

Quality of hydraulic hoses with reduced service life

The impact of using rubber hydraulic hoses with a shortened service life on environmental pollution has not yet been raised in the scientific national literature. Most researchers focus on the analysis of used engine oils or contaminated fluid in hydraulic systems, rather than on their direct environmental impact. For some time now, the European market has seen an increase in imports of cheap rubber hydraulic hoses from countries outside the Community. There is a potential risk of negative environmental impacts from the use of these hoses if they do not meet appropriate quality standards. The study examined samples of hydraulic hoses purchased directly from the manufacturers or traders of rubber hydraulic hoses from countries outside the European Union. The products were tested for compliance with PN-EN 853:2015-05 and PN-EN 857:2015-05. Out of 14 fully tested hydraulic hoses, only 2 were found to comply with the applicable European standards. The results encourage further research to determine the impact of rubber hydraulic hoses with reduced service life on environmental and economic costs.

An interconnected suspension with adjustable roll and pitch stiffness (IS-ARPS) to enhance anti-roll and anti-dive/squat characteristics

The suspension system is critical in maintaining vehicle stability in roll and pitch directions. Hydro-pneumatic interconnected suspension systems, in which the suspension struts are connected through hydraulic hoses, flow control valves, and accumulators, have great potential to further enhance anti-roll and anti-pitch characteristics. To address the existing designs’ shortcomings, this study introduces an interconnected suspension with adjustable roll and pitch stiffness (IS-ARPS). It not only eliminates the conventional anti-roll bars but also enables adjustment of roll stiffness depending on the driving and vehicle load conditions. In the pitch direction, the IS-ARPS provides an additional amount of pitch stiffness to reduce the dive/squat during braking/acceleration. The mathematical modeling of the IS-ARPS is also straightforward, requiring less computational cost and making it more practical for real-time implementations. Overall, the IS-ARPS system represents a significant advancement in the design of roll and pitch coupled interconnected suspensions, offering a more practical and versatile solution. The above features are examined through co-simulation between MATLAB/Simulink and ADAMS/Car.

ДОСЛІДЖЕННЯ НЕСПРАВНОСТЕЙ ГІДРАВЛІЧНИХ РУКАВІВ ПРИ ЕКСПЛУАТАЦІЇ ВИЛОЧНИХ НАВАНТАЖУВАЧІВ В МОРСЬКИХ ПОРТАХ

This study focuses on hydraulic hoses utilized in the hydraulic systems of forklifts. The investigation examined 8 forklifts, each with a loading capacity of 10 tons. The check took place every six months over a three-year span. Before and after each shift, the forklift operator performed visual checks and hydraulic system and brake а inspections. The research findings indicated that the most frequent hose malfunction was a result of a rupture. The failure rate noticeably increased during the winter, attributable to the low temperatures' adverse effect on the hoses' physical and mechanical properties. Another common area of hydraulic hose failure is due to substandard crimping and minimal fitting depth in the sleeves..

Varying Heat Release Rates per Unit Area – The Impact in Underground Mines

Abstract The fire behaviour and smoke behaviour of a fire in an underground mine will be largely dictated by the heat release rate of the fire. The heat release rate per unit area is generally the output from small-scale fire experiments and can be applied for larger objects with varying surface area. This paper studies the impact of varying heat release rate per unit area for fires in materials and substances typically found underground. Data from earlier fire experiments were analysed and discussed, and several different heat release rate curves and flame spread velocities for various fuel components were developed and discussed. It was found that the hydraulic hose presented the highest peak heat release rate per unit area of the solid fuel items, followed by the low-voltage cable, cab interior, and tyre in descending order. The increase in the peak heat release rate was highest for the highest incident heat flux levels, representative for scenarios underneath a mining vehicle. The heat release rate per unit area of pool fires underneath a vehicle is significantly higher than a corresponding free burning case - attributed to the higher incident heat flux – but a gravel surface underneath a pool fire will reduce the heat release rate considerably. Line fires in larger bundles of electrical cables were modelled and found to attain the peak flame spread velocity more rapidly compared with a fire in hydraulic hoses. This was caused by the higher heat release rate of the initial fire and ignited segments in the electrical cable case.

Hydraulic Measuring Hoses as Pressure Signal Distortion-Mathematical Model and Results of Experimental Tests.

The article presents the results of a developed model and experimental studies of the Minimess® hydraulic signal hose's influence on the changes in the indications of the pressure transducer during the high dynamics of hydrostatic drives and controls. The model test results show that measuring hoses can be used as hardware low-pass filters during the digital recording of pressure waveforms. However, the cut-off frequency values of the measuring hoses obtained using the model are dramatically lower than those observed during the experiment. The experiment results show that the measuring hoses can only be used without any limitations to measure the average pressure value. In the case of measuring pressure waveforms, the user should carefully choose the measuring hose length. For this reason, the relationship between the measuring hose length and its cut-off frequency should be known.

Experimental Verification of An Electro-Hydraulic Actuation System Driven by An Integrated Electro-Hydraulic Unit

This paper proposes an electro-hydraulic actuator (EHA) system, and a novel-designed electro-hydraulic unit (EHU) consisting of a fixed-displacement hydraulic gear machine and a variable-speed electric machine. The novel EHU design integrates an electric machine and a hydraulic machine in a single housing, targeting optimal compactness, power density, and component reduction. The EHA system features an open circuit design, where hydraulic hoses connect the EHU with a tank, a valve manifold, and the hydraulic cylinder. In this way, the proposed EHA technology can be used to implement distributed hydraulic actuation in a vehicle without requiring changes to the hydraulic actuators or at the overall layout of the hydraulic components with respect to the original vehicle design. A dedicated test rig is developed to verify the performance of the proposed EHA system. The efficiency of the EHA is measured in a steady state and under a realistic duty cycle of a commercial compact loader. The efficiency of the EHA system based on the measurements on the test rig can reach 54% with up to 20 kN load and 6 kW power level. Furthermore, the EHU is implemented on the reference machine to drive the boom function. Preliminary results on the performance of the EHU show an efficiency of up to 68% under different loading conditions.

Optimization of Displacement by Fluid–Solid Coupled Vibration of Hydraulic Hoses

Optimization of Displacement by Fluid–Solid Coupled Vibration of Hydraulic Hoses

LANDING GEAR FAILURES CONNECTED WITH HIGH-PRESSURE HOSES AND ANALYSIS OF TRENDS IN AIRCRAFT TECHNICAL PROBLEMS

Reliability and maintenance analysis in aviation industry focused on a main objective of the accident and incident investigations what are help to better understand the causes of accidents. In the article suggested the underlying concept by scorecard of situations what lead to aviation accidents. In the present research, the aviation accident connected with a landing gear and a problem of failure to follow maintenance instructions during a maintenance on aircraft landing gear hydraulic drive was under an investigation, on an example of root cause analysis of the failure of hydraulic flexible highpressure hoses. The approach presented in this research of experimental measurements, based on fluid pressure measuring, high-pressure hoses vibration measuring and frequency’s analysis. By spectrum analyses was found that high-pressure hoses are most susceptible to deformation at frequencies to the response of the fluid within, as well as at hoses material resonance frequencies. The compact version of hoses is more deformational on the resonance points than a standard version of hose. In final according to analyses, was established that disrespect of the frequency conditions was leaded to causes irreversible degradation changes of the hose inner structure and occurrence of material defects inside layers contact what lead in final step to hose failure.

Utilization of Tractor Power using Front Three Point Linkage

With a higher HP tractor it is difficult to take the maximum use of tractor power. Front three-point linkage has been found profitable with these tractors due to higher power requirement and also due to multiple operations in single pass. The importance of this study is to check its feasibility under Indian field conditions. Front three-point linkage are designed and fabricated according to Category II hitch requirements. Hydraulic cylinders are designed to provide hydraulic power to the front linkages. Selection of hydraulic hoses is done according to the requirements and availability. Mechanical front-wheel drive tractor is selected for the test. Laboratory test is carried out to evaluate its lifting performance. Field performance is also done to check its profitability. A field is prepared using cultivator in front and harrow in rear and the performance are calculated.

ANALISA KERUSAKAN DAN PERBAIKAN HYDRAULIC LIFT CYLINDER PADA WHEEL LOADER KOMATSU WA180

PT. Beurata Subur Peusada is a factory engaged in the palm oil processing industry (PMKS). To produce quality and quality palm oil products, it must be supported by good production machines. Especially on heavy equipment that has a lot of problems, because it is influenced by the age of the machine which is more than 10 years old. The hydraulic lift cylinder serves to transport and lower the arm using oil fluid as the medium. This research is to identify the types, triggers, and identify steps to repair the Komatsu Wa 180 Hydraulic Lift Cylinder Wheel Loader. The checking method was tried visually on the Hydraulic Hose, control valve, working pump, and Hydraulic Cylinder. The purpose of this study is to analyze the trigger for the damage of the Hydraulic Lift Cylinder. Research obtained on the hydraulic lift cylinder, the occurrence of damage to the seal and pins which resulted in the performance of the Komatsu Wa 180 Wheel Loader being not optimal. In repairing it is tried by exchanging damaged components and sterilizing all components from dirt. Avoidance activities by carrying out daily checks and preventive maintenance methods.

Braid Angle and its Influence on the Hydraulic Hoses Behaviour Under Pressure Loading

This paper deals with the experimental analysis of the effect of the braid angle on the behaviour of a hydraulic hose under pressure loading. The main structural elements of the hose are a rubber tube and a steel braid or spiral. The material of the braid and the number of braids influence the magnitude of the pressure load on the hydraulic hose. The angle of the braid affects the deformation of the hydraulic hose when the inner wall is loaded with fluid pressure. For hydraulic hoses, it is a requirement to maintain a neutral braid angle during manufacture to ensure a balance between axial and circumferential stresses under pressure loading. An experimental device was set up to measure the hoses. This device can be used to measure the diameter of the outer braid, the length and the tensile force of the hose in the axial direction and, where appropriate, to evaluate the angle of the outer braid of the hose as a function of the fluid pressure loading on the inner wall of the hose. The object of the research is to determine the effect of the braid angle on the behaviour of the hydraulic hose under pressure loading. Based on the measurements, the dependencies of the tensile force, the braid angle and the change in length of hydraulic hoses on the internal pressure were determined. In order to compare the measurement results, hydraulic hoses with different inner diameters and different numbers of braids or spirals were selected. Research background: Description of neutral braid angle, hydraulic hose geometry, tensile force of hose. Purpose of the article: Influence of braid angle on the hydraulic hoses behaviour under pressure loading. Methods: Experimental measurements. Findings & Value added: Determining of the change of length dependencies on the pressure, determining of the tensile force dependencies on the pressure.

Research on high-pressure hose with repairing fitting and influence on energy parameter of the hydraulic drive

Reliability and maintenance analysis of transport machines hydraulic drives, basically focused to power units: pumps, cylinders etc., without taking in to account junction elements. Therefore, this paper proposes a research analysis on high-pressure hoses and junctions during technical maintenance. Comparative analysis of fluid behavior and energy efficiency inside non-repaired and repaired high-pressure hoses is presented in this research. Theoretical and experimental research results for hydraulic processes inside high-pressure hose is based on the numerical simulations using Navier–Stokes equations and experimental measurement of fluid flow pressure inside high-pressure hoses. Research of fluid flow dynamics in the hydraulic system was made with main assumptions: system flow rate in the range from 5 to 100 l/min, diameter of the hoses and repairing fitting are 3/8". The pressure drops, power losses, flow coefficients at non-repaired and after maintenance hose was obtained as a result. Simulation results were verified by running physical experiments to measure the pressure losses.

Smarter Hoses Boost Green Schemes

Mobile machine manufactures are looking to improve their environmental credentials by reducing the fuel/energy consumption of their products. As part of these initiatives, OEMs should not overlook the many ‘green’ benefits of careful selection of hydraulic hoses.

Propagation Characteristics of Pressure Pulsation in Hydraulic Hose

Most modern aircraft hydraulic systems use variable plunger pumps. The pulsating flow output is its inherent characteristic. The resulting pressure pulsation often causes serious damage to the energy pipeline system and endangers the lives of the occupants. This paper studies the propagation law of hydraulic oil in hydraulic hoses, fully considers the coupling vibration of hydraulic oil high-pressure fluid and flexible solids of the hose, establishes a fluid-solid coupling vibration model of hydraulic hoses, and uses ANSYS for numerical simulation to study different frequencies and pipe bending. Using ANSYS for numerical simulation to study the influence of different frequencies and pipe bending radii on the amplitude of fluid pressure pulsation, after comparative analysis, the law of fluid pressure pulsation propagation in hydraulic hoses is obtained.

The RAMPDOOR HYDRAULIC SYSTEM MODIFICATION OF ANOA PANZER COMBAT VEHICLE

Panzer Anoa 6x6 is a combat vehicle on tires where the first generation of it is made by PT Pindad (Persero). It can mobility, protection and carrying capacity. The ramp door on the Anoa 6x6 APC armored vehicle is driven by a hydraulic system to support the mobility of personnel when exiting or entering the vehicle. The components of the hydraulic system driving the Panzer Anoa 6x6 APC ram door include batteries, power packs, solenoid valves, hydraulic hoses, and hydraulic cylinders. These problems include the ramp door often not functioning, the ramp door moving too slowly and often experiencing congestion when the ramp door is working. These constraints often occur because the pump in the hydraulic system is driven by an electric motor that gets its power source from the battery. The fluid is pressed and flowed through a hydraulic pipe, then the flow of the pressurized fluid is regulated by a solenoid valve to the hydraulic cylinder to move the ramp door. This study uses a pure experimental quantitative method with empirical calculations to obtain a tool with the desired specifications. To move the ramp door weighing 200 kg with a maximum opening angle of 100 degrees in 8 seconds, the heaviest load received by the cylinder is 23557.44 N, the working pressure that occurs in the cylinder is 87.49 bar, where the fluid discharge will flow to the pump. of 2164.77 liters/minute, with a pump power of 394570 Watt and to continue the rotation of the engine with a rotation of 2814.13 rpm (idle) to the hydraulic pump using a pulley mechanism with a ratio of 1: 0.15.

Research on Damping Characteristics of Interconnected Hydropneumatic Suspension considering the Effects of Hose and Check Valve

The interconnected hydropneumatic suspension (ICHPS) has not only the nonlinear stiffness and damping of the independent hydropneumatic suspension (IDHPS) but also antiroll and antipitch functions. The existing analysis of hydropneumatic suspension damping mainly focuses on the orifice and check valve in the suspension cylinder. In this study, the calculation formula of the damping force of ICHPS is established, and the numerical simulation results show that the damping characteristics of the hydraulic hose cannot be ignored. The influence of check valve and hose on the damping characteristics is analyzed. Through the equivalent energy method, the equivalent compression damping ratio and the equivalent recovery damping ratio of the ICHPS are established. It is pointed out that when designing the damping characteristics of the ICHPS, it is necessary to select the orifices, check valves, and hose damping reasonably to make the damping characteristics get the best match.

Design and Experimental Verification of Pressurized Cylinders in Hydraulic Rubber Hose Pressure Washers

Hydraulic rubber hoses are subject to great hydraulic impact during the actual working process, which causes a great potential safety hazard. Therefore, it is necessary to carry out pressure tests on hose assemblies to ensure its quality, so providing a high pressure for the hydraulic hose has become the key technology of this problem. Aiming at solving the problem of detection of pressure resistance in hydraulic rubber hose cleaning machines, this paper analyzed the pressurization mechanism of the hydraulic pressurized cylinder and proposed a method of continuous pressurization. This paper also theoretically analyzed the pressure expansion of the rubber hose, and the conclusion is that for the maximum hose capacity (hose size is Φ25 mm × 6 m), the volume of water required to provide water in the hose from 10 MPa to 100 MPa is 0.59 L. The pressurized cylinder was designed and checked theoretically and analyzed by the finite element method. It is concluded that the maximum stress of the pressurized cylinder is concentrated at the bottom of the high-pressure chamber, and the outlet hole at the bottom of the cylinder barrel of the high-pressure chamber is the weakest part of the pressurized cylinder. The performance of the supercharging cylinder is verified by experiments, which proves the feasibility, rapidity and stability of the supercharging cylinder.

Perawatan dan Perbaikan Sistem Hidrolik pada Dumping Dump Truck Mitsubishi Fuso 190Ps

Sistem hidrolik pada dump truck yang terdiri dari beberapa komponen memerlukan tindakan perawatan terencana, agar sistem hidrolik dapat berfungsi secara optimal. Tujuan penulisan adalah untuk dapat melakukan analisa kerusakan dan dapat melakukan tindakan perbaikan dengan tepat dan benar. Metode penganalisaan dalam analisa perawatan dan perbaikan sistem hidrolik ini ialah dengan menggunakan beberapa pertanyaan, yaitu apa, kenapa, dimana, dan bagaimana. Komponen utama sistem hidrolik dump truck yang memerlukan perawatan adalah seperti tangki hidrolik, pompa, katup, aktuator, filtrasi dan slang hidrolik, adapun penyebab utama kerusakan dari komponen sistem hidrolik tersebut adalah karena kebersihan oli hidrolik yang buruk, kontaminasi dalam sistem, dan kelebihan beban(over load). Untuk mengatasi kerusakan yang terjadi adalah dengan jalan menerapkan manajemen perawatan dan perbaikan yang benar, terencana dan sesuai SOP.