Multi-domain unified modeling and simulation of semi-active suspension in magnerorheological damper
In order to build high-precision and highefficient MR damper system model, a multi-domain unified modeling method was proposed. Firstly, based on the analysis of a MR damper semi-active suspension system model, various fields of MR, such as structure, magnetic field, control and mechanics, were studied to find the main influencing parameters. And then for the multi-domain coupling characteristics of MR damper, a multi-domain unified modeling of MR damper system was established based on Modelica/MWorks platform. By adjusting the main influencing parameters, the relationship diagrams between the parameters and the performances were obtained. Finally, some performance results were compared with the traditional method used Matlab/simulink modeling and the method proposed. The results show that the model based on Modelica can preferably reflect the complex relationship between the MR damper coupling among the parameters within the system, and can get a better simulation result.
Research on control and performance of base on MR Semi-active suspension in automobile
A mini-car was chosen as a reference model and a magnetorheological damper as the research object.According to vehicle dynamics theory,a 1/4 car semi-active suspension control system dynamics model was set up.Based on shyhook control algorithm,the performance of the magnetorheological semi-active suspension was analysized and control was studied by using modern control technology.The studies have shown that combining the appropriate control algorithm,can make fully use of the semi-active suspension system properties with the magnetorheological damper and effectively improve the comfort and handling stability of the vehicles.Using the parameters of a type mini-car,the sprung mass acceleration,suspension deflections and tire load three index under different control strategies were compared.The results show that the control strategy in the selection of complex multi-mode control has better control effect and can more effectively improve the dynamic performance of the vehicles.
Study of Biogas for Power Generation at Pesantren Saung Balong Al-Barokah, Majalengka, West Java
Utilization of biogas from cow manure as a fuel alternative for power plants is done through an anaerobic process. A pilot plant with biogas production of 7 m 3 /day has been installed at Pesantren Saung Balong. Biogas is used for everyday purposes such as cooking and lighting, and used as pure biogas with 2.500 Watt scale generator. Biogas produced with the rate of 0.080 m 3 /hr. Biogas produced during the measurement (450 minutes) is 0.604 m 3 . With these data it is predicted that within a day (24 hours) biogas which can be generated is equal to 1.92 m 3 . Meanwhile, consumption of biogas to the generator with 1.047 W load is 0.019 m3/minutes, the generator will operate for approximately 101.05 minutes or 1.68 hours. Thus electricity that can be saved is 1.759 kWh per day or 52.77 kWh per month and electricity cost that can be saved that is equal to Rp.40.896/month.