For the past decade, active suspension systems had made up most of research area concerning vehicle dynamics. For this review, recent studies on automobile active suspensions systems were examined. Several vehicular suspension types were also described to compare amongst them. From published investigations by previous researchers, various automotive suspensions in terms of cost, weight, structure, reliability, ride comfortability, dynamic and handling performance were exhibited and compared. After careful examination, it was concluded that electromagnetic active suspensions should be the general direction of vehicle suspension designs due to its energy regeneration, high bandwidth, simpler structure, flexible and accurate force control, better handling performance as well as drive characteristics.

Hydrogen isclassified as New Energy and also considered as the most promising transportation fuel candidate in the future. Various pilots test of hydrogen fuel cell vehicles by the world's leading automotive industries since the last 50 years have begun to show bright spot in the utilization of hydrogen-based fuel cells as vehicle fuel. The electrolysis process of water (H2O) would produce H2 (hydrogen) and O2 (oxygen). The conventional method resulted in inconsistent volume and quality of HHO gas. However, the current development of HHO gas production through electrolysis process varies in term of materials, production process, design of certain tools, and technical modifications to obtain optimum results. In this research, the Hybrid Multistack TypeHHO generator has been designed and developed by combining two types of dry and wet cell generators. In this study using both cell type generator (wet and dry cell) or called as a hybrid type. Through the process of electrolysis in HHO enclosure space, the HHO gas was produced. The volume of HHO gas obtained from the HHO generator as an alternative fuel is strongly influenced by the electrical current supplied and the concentration of KOH catalyst used. The test was conducted with four stages of catalyst amount from 5.6g/L; 11.2g/L; 16.8g/L; and 22.4g/L. The applied current is linearly increased, with the increasing HHO gas production. It is proven when with the amount of catalyst used at 22.4g/L, the average HHO gas produced is 230.3mL/min. The author analyzes the performance of the generator in term of current and HHO gas production at a predetermined 12V constant voltage.

Perusahaan yang bergerak di bidang jasa inspeksi sering mendapatkan tugas untuk mengetahui berat atau kekuatan struktur dari benda yang diinspeksi di lapangan. Untuk memenuhi kebutuhan tersebut akan di rancang bangun load cell kapasitas 20 kN untuk beban kerja tarik dan tekan dengan sederhana namun memiliki fungsi yang sama serta memenuhi kebutuhan pengukuran atau pengujian dilapangan. Pembahasan mencakup pemilihan bahan, perhitungan perencanaan, penempelan strain gauge, verifikasi load cell serta metode kalibrasinya load cell dengan kapasitas 20 kN untuk beban kerja tarik dan tekan. Verifikasi terhadap load cell dilakukan untuk mengetahui kesesuaian antara perhitungan perencanaan dan hasil pengukuran. Dari hasil verifikasi ditemukan bahwa terdapat penyimpangan regangan sebesar 12,619 μ atau sekitar 1,48 % dan penyimpangan tegangan sebesar 3,28 𝑁/𝑚𝑚2 atau sekitar 1,85 %. Berdasarkan hasil evaluasi data kalibrasi dengan mengacu pada British Standard ISO 376:2011, load cell tidak masuk dalam kelas 0, 0,5, 1 dan 2 karena memiliki nilai ketidakpastian (U95) yang melewati batas yang ditentukan yaitu ketidakpastian pengukuran (U95) sebesar 0,24 % untuk beban kerja tarik dan) 0,23 % untuk beban kerja tekan.

The working principle of an internal combustion engine, in general, is to convert chemical energy from liquid fuels to mechanical energy. The type of fuel commonly used by internal combustion engines is fossil fuel, which until now has been increasing in use while its supply is running low. The presentstudy is to conduct research in the field of new and renewable energy as an alternative fuel to replace fossil fuels. Hydrogen is a new form of energy carrier that could be obtained through the process of water electrolysis and is a promising fuel supplement in the future. Hydrogen production through the electrolysis process continues to be develop to help use environmentally friendly fuels and can have a positive impact on engine performance and exhaust emissions. However, to produce consistent and quality HHO gas output, the current HHO gas generator still needs tobe improved especially for the production volume. The purpose of this research will be directed to the development of the effective electrode plate system in producing HHO gas. In order to improve the quality and volume of HHO gas production, it was found that the level of surface roughness and the contact angle of the material should be increased through grinding and polishing processes. In this research, various SS316L electrode plates with different surface roughness were made for the analysis of HHO gas production to match the expected volume of HHO gas production. Various conditions of surface roughness of the electrode plate are carrying out by grinding and polishing the surfaces of both sides of the electrode plate to a uniform roughness level.

Desain turbin angin adalah proses menentukan bentuk dan spesifikasi turbin angin untuk mengekstraksi energi dari angin. Instalasi turbin angin terdiri dari sistem yang diperlukan untuk menangkap energi angin, mengarahkan turbin ke arah angin, mengubah putaran mekanis menjadi tenaga listrik, dan sistem lain untuk memulai, menghentikan, dan mengontrol turbin. Perancangan turbin angin pada penelitian ini, adalah turbin angin yang akan menerima energi angin dari arah yaw (<em>yaw direction</em>). Gerakan menentukan arah dari terbin angin ini dibantu oleh perangkat lunak Lab-View dengan menggunakn kontroler arduino sebagai pengendali arah gerakannya. Perancangan sistem kontrol pergerakan sumbu <em>yaw</em> dari turbin angin dengan bantuan perangkat lunak LabView dan arduino untuk mengendalikan motor yang akan memutar roda gigi yang dihubungkan dengan plat. Pergerakan ini diharapkan dapat menjadi peningkat efisiensi dari turbin angin dalam menerima angin yang datang. Hasil kalibrasi sistem turbin angin dilakukan pada gerakan motor pada arah yaw, dan data putaran potensiometer terhadap tegangan listrik yang diberikan sebagai inputnya.