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The accuracy of multi dimensional simulation of vehicle dynamics has been significantly increased for both passive and active vehicles which are equipped with advanced electronic components. Recently, one of the subjects that has been considered is increasing the car safety in design. Therefore, many efforts have been done to increase vehicle stability especially during the turn. It is also very important in three wheel car. One of the most important efforts is adjusting the camber angle in the car suspension system. Camber angle as well as the vehicle stability has major effects on the wheel slip, reducing rubber abrasion, acceleration and braking. Since the increase or decrease in the camber angle impacts on the stability of three wheel vehicles, in this paper, a car suspension system mechanism is introduced by which camber angle could be adjusted furthermore the mechanism is user friendly applicable and also economic. Actually, a passive double wishbone suspension system with variable camber angle has been designed, analyzed and subsequently manufactured. This mechanism was modeled in Visual Nastran software and kinematic analysis was presented. It can change camber angle from −5.5 to 5 degrees. In this work, two different modeling is presented, active geometry system (variable camber) and passive (conventional suspension system) then the rate of Roll and Yaw angle were discussed to investigate and compare models stability in same condition. Simulation and test results have shown that vehicle stability in active geometry model is sustained more than conventional models.

Assessment of respiratory volume is widely used in clinical application in order to assess the case of respiratory illness, and the progression of the respiratory syndrome. Respiratory plethysmography is used to determine the changes of chest volume to monitor the breathing. A wearable respiration measuring system has been introduced for detection of volume variations of chest. The system consists of a flexible sensor, stretchable cloth and electrical board. The flexible sensor, whose electrical voltage is produced by body movements, is installed inside the shirt and closely contacts the chest. The low frequency components of body movements recorded by the sensor are mainly generated by respiration. The system can be used at home and be selfapplied by patients. The main features of this system are: low cost, low weight and applicable for athletics and patients. We have tested the system thirty four times for calibration. The curve equation of the flexible sensor output versus the output of spirometer is presented. Finally, this curve equation can be used to determine the changes of chest volume.