Xem 1-14 trên 14 kết quả Rolling motion
  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Effects of visually simulated roll motion on vection and postural stabilization

    pdf11p panasonic01 12-12-2011 22 4   Download

  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Effects of visually simulated roll motion on vection and postural stabilization

    pdf11p panasonic08 06-01-2012 23 2   Download

  • The phenomenon of friction has been part of daily life since the beginning of human existence. It is no surprise that some of the earliest human activities involved the reduction of friction when it was wasteful, or the use of friction when it could be beneficial. The first category includes the use of vegetable oils and animal fats as lubricants, as well as the use of rolling motion to take advantage of the resulting low resistance to movement.

    pdf40p lyacau 30-12-2009 67 28   Download

  • Like all other sciences, physics is based on experimental observations and quantitative measurements. The main objective of physics is to find the limited number of fundamental laws that govern natural phenomena and to use them to develop theories that can predict the results of future experiments. The fundamental laws used in developing theories are expressed in the language of mathematics, the tool that provides a bridge between theory and experiment

    pdf1333p gian_anh 18-10-2012 97 19   Download

  • Moving parts in machinery involve relative sliding or rolling motion. Examples of relative motion are linear sliding motion, such as in machine tools, and rotation motion, such as in motor vehicle wheels. Most bearings are used to support rotating shafts in machines. Rubbing of two bodies that are loaded by a normal force (in the direction normal to the contact area) generates energy losses by friction and wear.

    pdf40p lyacau 30-12-2009 89 17   Download

  • The collective load is the basis for determining the average speeds (2,387 min–1) and the average driving speed (111 km/h). For each of the load cases the tooth load acting on the pinion and the reaction loads from the bearings have to be calculated both for forward and backward motion (percentage times 50 % each). In addition to these forces, the bearings are subjected to loads due to the rotor weight, the unbalanced magnetic pull, unbalanced loads and rail shocks. Of these loads only the rotor weight, GL, is known; therefore, it is multiplied by a supplementary factor fz = 1.

    pdf223p beobobeo 01-08-2012 51 10   Download

  • 181 the ball ADV gently V roll V' PP down the hill The different positions occupied by the adverb gently in (44) and (45) reflect a subtle meaning difference between (43a) and (43b): (43a) means that the action which initiated the rolling motion was gentle, whereas (43b) means that the rolling motion itself was gentle.

    pdf10p hanhphuc51 20-12-2010 41 8   Download

  • Moving parts in machinery involve relative sliding or rolling motion. Examples of relative motion are linear sliding motion, such as in machine tools, and rotation motion, such as in motor vehicle wheels. Most bearings are used to support rotating shafts in machines. Rubbing of two bodies that are loaded by a normal force (in the direction normal to the contact area) generates energy losses by friction and wear. Appropriate bearing design can minimize friction and wear as well as early failure of machinery...

    pdf30p hiruscar 13-10-2010 38 5   Download

  • The collective load is the basis for determining the average speeds (2,387 min–1) and the average driving speed (111 km/h). For each of the load cases the tooth load acting on the pinion and the reaction loads from the bearings have to be calculated both for forward and backward motion (percentage times 50 % each). In addition to these forces, the bearings are subjected to loads due to the rotor weight, the unbalanced magnetic pull, unbalanced loads and rail shocks. Of these loads only the rotor weight, GL, is known; therefore, it is multiplied by a supplementary factor fz = 1.5...2.

    pdf0p beobobeo 01-08-2012 37 5   Download

  • An electric drive is the electromechanical system that converts electrical energy to mechanical motion. Being a part of automatic equipment, it acts together with the driven object, such as a machine tool, metallurgical, chemical, or flying apparatus, domestic or medical device. Electric drives area includes applications in computers and peripherals, motor starters, transportation (electric and hybrid electric vehicles, subway, etc.

    pdf102p sn_buon 29-11-2012 41 15   Download

  • Linear Motion & Precision Technologies Bolt-tightening Handbook .The SKF Group The SKF Group is an international industrial corporation owned by SKF Sweden AB. Founded in 1907, it operates in 130 countries and has some 40000 employees. The company has over 80 manufacturing units throughout the world and a network of nearly 20000 distributors and retailers. SKF is the world leader in the rolling bearing business.

    pdf44p namson94 18-07-2012 62 13   Download

  • Bearings (both plain and rolling element) are used as important supporting elements for locating rotating components and confining their motion in desired direction. In order to ensure their operational reliability and desired life, these need to be properly designed/selected for an application more so because of ever increasing operational speeds. This requires the careful performance evaluation of different types of bearings considering aspects such as thermal stability, lubrication, contaminants in lubricants and controlling mechanism etc....

    pdf248p cucdai_1 19-10-2012 39 13   Download

  • The models seen in the previous chapters dealt with vehicles that maintain their symmetry plane more or less perpendicular to the ground; i.e. they move with a roll angle that is usually small. Moreover, the pitch angle was also assumed to be small, with the z axis remaining close to perpendicular to the ground. Since pitch and roll angles are small, stability in the small can be studied by linearizing the equations of motion in a position where θ = φ = 0. Two-wheeled vehicles are an important exception. Their roll angle is defined by equilibrium considerations and, particularly at...

    pdf47p hiruscar 19-10-2010 25 4   Download

  • The nonholonomic nature of the car-like robot is related to the assump- tion that the robot wheels roll without slipping. This implies the presence of a nonintegrable set of rst-order di erential constraints on the con guration variables. While these nonholonomic constraints reduce the instantaneous mo- tions that the robot can perform, they still allow global controllability in the con guration space. This unique feature leads to some challenging problems in the synthesis of feedback controllers, which parallel the new research issues arising in nonholonomic motion planning.

    pdf45p nhacchovina 23-03-2013 28 4   Download

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