To avoid an unnecessary catastrophic accident due to a failure of a railway track, it is important to have a reliable condition monitoring system for the railway track. The integrity of the railway track can be assessed by monitoring the displacement field of the track, which can then be used to determine the strain and stress field. By knowing the stress history of the track and the S–N curves of the track material, the remaining life of the railway track can be predicted. In the present work, a simple system to monitor and record the displacement field of the railway track has been developed by using Digital Image Correlation (DIC) technique. The set–up to monitor the displacement field of the railway track was developed using a high speed video camera of Nikon J1 to capture the image of the railway track when the train passing through. The DIC technique was then employed off line to measure the displacement field of the 2D image captured. The results showed that the full field displacement measured by using DIC technique gives a good agreement compared to the finite element results. The full field displacement can be used to calculate the strain-stress field, and later on the remaining life assessment can be conducted based on the results.

Peripheral Arterial Disease (PAD) is a blood vessel disease caused by blockage or plaque accumulation around the artery walls. PAD is included in the category of diseases that are often diagnosed too late and affect more severe cases, such as the death of certain tissues or body parts. The Ankle Brachial Index (ABI) is an accurate non-invasive method for diagnosing PAD, in practice, ABI is usually performed in certain hospitals and is still difficult to find due to limited tools. Therefore, a tool is made that can detect the condition of a person's PAD based on the ABI value. The tool is made using two MPX5050GP sensors to detect oscillometric pulses, a DC pump and solenoid valve as an actuator to pump and deflate the cuff, ADS1115 as an external ADC to increase the accuracy of sensor readings, as well as an LCD and buzzer as tool indicators. The output is displayed in the form of a print out from a thermal printer, with an emergency stop that functions as a safety system to power off the supply when a failure occurs in the measurement process. Oscillometric method is used to detect systolic and diastolic pressure. The accuracy of the tool is 95.5%. This accuracy result is obtained by comparing the readings of systolic and diastolic values using a sphygmomanometer which is commonly used.

No abstract

Flight control of elevator are used to control the attitude of the aircraft in pitching configuration. The system of this flight control are controlled by the force given by a pilot so that the aircraft will move to the desired pitch condition. In this research the force that should be inputted by a pilot easily and smooth are analyze. The study of this analysis was using N219 airplane designed by PT. Dirgantara Indonesia. The preliminary design of the force that should be inputted by a pilot are in 495 kN.mm. The result of the study are shown that the length of the arm in the elevator system give Margin of Safety in a range of 3-4.

Untuk mengetahui kekuatan struktur suatu pesawat terbang, dilakukan perhitungan dan analisis kekuatan struktur. Struktur sayap pesawat terbang yang disusun dari material komposit, penghitungan dan analisis kekuatan struktur salah satunya dilakukan dengan menghitung failure index untuk masing-masing layer/susunan dari material komposit tersebut. Pada penelitian ini, struktur sayap Pesawat terbang tanpa awak (PTTA) Ai-X1 yang terbuat dari material komposit dianalisis kekuatan strukturnya dengan menghitung failure index dari masing-masing layer/susunan material komposit tersebut. Perhitungan failure index dilakukan dengan menggunakan kriteria kegagalan Tsai-Hill. Hasil dari penelitian ini yaitu nilai failure index pada masing-masing layer/susunan material komposit struktur sayap pesawat Ai-X1. Berdasarkan kriteria Tsai-Hill masing-masing layer/susunan tersebut menunjukkan tidak adanya keretakan pada lamina.