This paper deals with the design, modeling and analysis of implementing a Multilayer Piezoelectric Vibration Energy Harvesting (ML PZT VEH) Mechanism in the vehicle suspension. The principle of work of the proposed ML PZT VEH mechanism is reducing the relative motion of the suspension, amplifying the applied force to the PZT by a specific design of mechanism and combining a single layer PZT into multilayer PZT to increase the produced electricity. To maintain the performance of suspension as the original suspension, the ML PZT VEH mechanism is mounted in series with the spring of the suspension. The proposed ML PZT VEH mechanism and its implementation to the vehicle suspension were mathematically modeled. Responses of the vehicle before and after implementing ML PZT VEH mechanism were simulated. The results show the proposed mechanism can produce output voltage of 2.75 and power of 7.17 times bigger than direct mounting to the vehicle suspension. And the simulation result shows that mounting ML PZT VEH mechanism in series with the spring of the vehicle suspension does not change the performance of suspension.
Tourism activities are one thing for supporting regions and the country's economic development, through foreign exchange, tax revenues, and other levies. Tourism activities in one area can increase employment, accelerate the construction of facilities and infrastructure. Tourism also be able to introduce the local production goods for local and foreign tourists. Recently, the Muslim community is the largest community in the world and Indonesia is one of the countries with the most Muslim population. Seeing this opportunity, the Indonesian government in 2012 began for introducing halal tourism in Indonesia. Sumenep, East Java, Indonesia has a variety of tourism potential that can be developed into halal tourism. This study has been mapped all potential for halal tourism in Sumenep, East Java, Indonesia. The potential of halal tourism in Sumenep which has been successfully mapped includes object of food, beach tourism, traditional weapon (keris) tours, centers of batik Sumenep, religious tours, historical tours and natural tours. Hotel and hostelry was also available so that the tourist can plan their vacation in the desire time. Transportation between tourist attractions can also be accessed easily. All tourism objects are includes the criteria of Halal tourism. It can be summarized as Sumenep Halal tour package. This potential was also supported by the religious culture of Sumenep people. This mapping will make it easier for Muslim tourists in particular to access halal tourism in Sumenep, East Java, Indonesia.
This paper deals with the design, modeling and analysis of a hybrid shock absorber for vehicle suspension. A specific design of frictional-electromagnetic-regenerative shock absorber is proposed. The hybrid shock absorber consists of the proposed frictional-electromagnetic-regenerative shock absorber assembled in parallel with a conventional-viscous shock absorber. The concept of hybrid shock absorber is proposed due to the following advantages: the regenerative shock absorber will recover some wasted vibration energy from the suspension into electrical energy to support the need for electrical energy of the vehicle, while the viscous shock absorber maintains the performance of suspension closed to its original suspension. The vehicle suspension system dynamic was mathematically modeled for three different types of suspension:1).Conventional suspension using viscous shock absorber; 2).Hybrid suspension using combination of 50% frictional-electromagnetic-regenerative shock absorberand50% viscous shock absorber; and 3).Full regenerative suspension using 100% frictional-electromagnetic-regenerative shock absorber. In this research, 6 wheels military vehicle (APC:Armour Personal Carrier) is chosen as the model due to the high possibility of applying regenerative suspension to the military/off road vehicle. Based on the mathematical models, performances of the vehicle suspension and the regenerated power from regenerative shock absorber (RSA) were simulated. The results were compared between the three types of suspension and discussed.
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