Anti Jerk Control Of Hybrid Electric Vehicle Engineering Essay

Anti Jerk Control Of Hybrid Electric Vehicle Engineering Essay The report details the review done in the area of anti-jerk control of vehicles. It explains the phenomenon of driveline oscillations excited due to torsion of driveline at high engine torques causing unwanted longitudinal oscillations in vehicle body. Report starts with a broad introduction to the topic and lays down the aims and objectives of the research project. The aims and objectives of the project are to design an active feedback control for an electric motor of a hybrid electric vehicle to damp these undesirable oscillations. A summary review of previous research work done in this area is presented which defines the starting point of the project. Different techniques used for anti-jerk control in conventional vehicle are discussed. Basic approach to model based control design is presented in the report. An introduction to hybrid electric vehicle driveline and description of its components different from conventional vehicle is shown. The report also lays down the procedure o f the work to be followed for the research project with a project plan. INTRODUCTION The increasing pressure of protecting the natural environment and to decrease the dependence on non-renewable sources of energy has encouraged vehicle manufacturers to develop more clean and efficient power systems. As a result Hybrid vehicles are hot topic for research among vehicle manufacturers. Efforts are being made to make the vehicles more fuel efficient with high performance and minimum CO2 emissions. Diesel hybrids are considered as next big thing among ecological designs since diesel engines are 20 % – 30% more fuel efficient than their petrol counterparts. Nowadays noise, vibration and harshness (NVH) issues have become more important for a customer such that there are very stringent requirements for noise or vibration in a vehicle. Driveability of a vehicle is majorly impacted by NVH problems and is strongly felt as vehicle’s performance during various manoeuvres such as ac celeration, braking, gear change etc. Thus vehicle manufacturers and OEM’s have realized the importance of NVH issues and target to identify the root cause of vibration and incorporate the correcting measures at early stages of manufacturing with a main goal to refine the ride and driveability of a vehicle. These days’ efforts are being made to increase the performance of vehicles and to make them more fuel efficient by using different techniques and one of the techniques is electrification of various systems in a vehicle. Electronic power assist steering system, electric active roll control, electronic differential, brake by wire are some of the examples of electrification of vehicle systems. This kind of methodology becomes more evident in case of hybrid electric vehicles where electric power components including power electronics are integral part of the powertrain. It has been observed that using these electrification techniques not only helps in increasing the per formance of the vehicle but also makes them more fuel efficient. Thus the electrification in a diesel hybrid powertrain to improve the driveability of vehicle forms the main platform for this research project. Problem Statement One of the major NVH issues in automobiles is torsional vibrations of driveline. The torsion of drivetrain at high engine torques causes oscillations in driveline. These oscillations are generally excited by various sources such as rapid or sudden load/torque change, gear change and unevenness of road surface. These oscillations cause longitudinal acceleration in vehicle structure and passenger compartment of the vehicle, which reduces the comfort and driveability of the vehicle and are experienced as unwanted jerking by the driver and passengers. These type of driveline oscillations are termed as Jerking, which is the main focus of this research.

Literature by Women of Color Essay Example | Topics and Well Written Essays - 1750 words

Literature by Women of Color - Essay Example In essence, food imagery is not only about material substance per se but also substantial materials or elements that refine and define a particular literary work. By and large, food is central to the narrative of the three texts. This paper touches the vibrant role that food serves in these literary pieces. It also explores food as a symbol and a mediator. The role of food significantly contributes to the theme of the piece and other elements characterized in literature. First, the image of food substantially helps visualized the narrative of the story. In â€Å"A Temporary Matter,† for instance, the almost empty pantry -- where food items are stock -- suggests the emptiness and absence of comfort needed for family who just lost a child. The failure to fill-up foodstuffs into the pantry, which used to be constantly filled-up and refilled, dramatically implies the failure to fill-up the sunken emotions between the husband and the wife, namely, Shoba and Shukumar. Second, food imagery vividly shows the character’s inner mind and heart. In â€Å"When Mr. Pirzada Came to Dine,† for example, the confections that the main character brings to the host’s house strongly suggest his fatherly love of, and probably his missing of the, children. With the absence of his daughters, Mr. Pirzada tries to connect to his girls through the candies and cakes he gives to little Lilia. Foodstuffs permit the character to care and hope for the lives and safety of his family back home. Third, food in literature reveals the cultural upbringing and background of the characters in the piece. The foodstuffs apparent in Lilia’s home, which the characters share and eat, are expressions of shared culture and tradition. For instance, the chewing of fennel seeds after meal, the avoidance of drinking alcohol, among other things, are vital signs of inherited heritage of food etiquette from generation to generation. The invocation of the food names and

Tango Music Essay Example | Topics and Well Written Essays - 1750 words

Tango Music - Essay Example And that, of course, was my mistake. He wasn't dancing the rhythm of the music. He was dancing the phrase." The Tango is Argentina's cultural and national contribution to the European world. It has come to show the soul and personality of Latin style. The music emphasizes themes of passion and desire, despair and loneliness, jealousy, and its spiritual and emotional dance moves are memorable for their pictures of intertwined limbs and Latin machismo. There are differing points of view on the origins of the word tango but all researchers agree that it was used in America to help gathering of the black population for social aims. Jorge Novati in "Antologia del Tango Rioplatense" carries these meetings to the late 18th century in Buenos Aires. Alejo Carpentier in "La Musica en Cuba" says that the tango was in Cuba also. Around 1880, in the gambling houses and bars, lonely men spent time drinking, socializing, gambling, and looking for a little romance in the company of women of bad repute, trying to step to the music. This gave rise to the new dance, tango. This proximity of the bodies in public was considered to be impossible and scandalous. The black population in America used and adapted European forms for their entertainment, tradition and rituals. That is why the music and choreographic was transformed by the addition of rhythms and some other elements which were typical for African culture music and dance. One of the most influential genres in the rise and finding its individuality of the early tango was the Cuban habanera. Using the materials of historian and writer Alejo Carpentier, the habanera developed in Cuba from the mixture of African rhythmic influences and the French contredanse. The habanera became a real sensation and was transported back into Spain, where it was known as tango Americano. The habanera came to Buenos Aires in the late 19th century and became very popular there. Musicologist Jorge Novati, who continued the work of Carlos Vega, tells us, that the habanera had two versions: very popular and lascivious and another, more decent, which existed in late 19th century Buenos Aires. The popular version was danced by the African-American population at their gatherings, called tangos. The more acceptable version, meanwhile, was danced in the salons. By the last decades of the 19th century, a distinct dance form of dance was developed, which gathered the inventions of the Afro-Argentines: the corte and quebrada. The corte refers to a sudden stop in the general walk of the dance. During this stop the dancers would show different figures that added to a new vocabulary of dance. The quebrada was an undulation of the hips, and gave erotic character to the dance. It became so popular that it start to influence musicians, they start to incorporate different rhythmic variations into their own music. The music they played was a mix of European popular dance forms, such as the mazurka and schottische, habaneras, and milongas. According to Novati, the milonga had a short but productive existence in Buenos Aires, and is the ancestor of the early tango (tango criollo). It was really a rural poetic form but in the later version it resembled the rhythmic patterns of the habanera and became the main part in the birth of Argentine Tango. Musicians started gathering their repertoire and the first composers of Spanish-tinged tango-milonga and gaucho-influenced