如何学习托福传动比计算（Gear ratio calculation）
Cycling is a mi mechanized sport. Coaches and athletes should master the mechanical principle and mechanical knowledge, effective u of transmission ratio, a reasonable grasp of exerci intensity, cleverly save energy consumption, thus to stamina, of high quality scientific training. The bicycle is a transmission type machine, and the driving device of the bicycle compris a driving gear (generally called wheel disc), a passive gear (generally called a flywheel), a chain and a transmission, etc.. Gear ratio and transmission ratio are related to the efficiency of the bicycle. Coaches and athletes should understand and master the calculation and application of the data.
Edit this gment gear ratio
Gear ratio: the ratio of the number of teeth of the driving wheel to the gear wheel is gear ratio. If the teeth of the two gears are the same, then the two gears and the rear wheels rotate for one week at each tread. If the number of teeth of the driving gear is greater than the number of teeth of the passive gear, then the number of turns of the passive gear is greater than a week per step, and the speed is faster. Therefore, the gear ratio is proportional to the number of teeth of the driving wheel, inverly proportional to the number of teeth of the passive gear. The G gear ratio, C reprents the number of t福州sat培训
eeth of the driving gear and the passive gear tooth number F, the relationship between them using the formula, namely: G=C / F for example: ATX830 tooth disc has 44 teeth (3), the flywheel has 11 teeth (9), into the formula can calculate the gear ratio of G=C / F= 44 / 11=4 is pedaling tooth disc for a week, the
flywheel turn around.
Edit the transmission ratio of this ction (transmission coefficient)
Transmission ratio (transmission coefficient): gear ratio after the wheel diameter, that is, the transmission ratio. The D reprents the transmission ratio, rear wheel diameter B reprents the relationship between them, using the formula, namely: D=C / F * B=GB thus, gear ratio was determined, and the transmission ratio is proportional to the diameter of the back wheel. For example: ATX830 tooth disc has 44 teeth (3), the flywheel has 11 teeth (9), rear wheel diameter of 26 inch (commonly ud inch), into the formula can calculate the transmission ratio: D=C / F / =4 * B=44 11 * 26 * 26 = 104
工程队Edit the transmission stroke (speed ratio, stroke) of this ction
The transmission stroke, each tread of the wheel is a week, and the distance of the forward movement of the car is the drive stroke, also called speed ratio stroke. The calculation method of transmission ratio is multiplied by the pi. With the M transmission schedule, Pi Pi reprents (this is constant, pi = 3.14), the relationship between them reprented by formula. M=D: F * B * =C / Pi Pi bicycle wheel diameter measurement generally ud English said, and the travel is calculated by the metric general habits, so the calculation needs to English conversion system. An inch of =2.54CM is reprented by K, that is: K = 2.54CM. Into the formula, namely: M=C / F * B * pi * k for example, the tooth disc ATX830 44 teeth (3), the flywheel82届奥斯卡获奖名单
has 11 teeth (9), rear wheel diameter of 26 inches, and its range into the formula: M=C / F * B * k * =44, 11 * pi 26 x 3.14 x
2.54 = 829.4624 CM data above is the tooth disc each pedaling
a week, the car forward for the 829.4624 cm, about 8.29m.
Velocity calculation
鹬蚌相争翻译Bicycle athletes training and competition riding distance range of different speeds, in order to facilitat
e the level of coaches, proper arrangement of the exerci volume and intensity, in a very short period of time, calculate the average speed of athletes (km / h). Generally speaking, V stands for speed, S stands for distance, T stands for time, and the relation between them is..:
V=S/T
resample
S=V * T
T=S/V
For example: riding distance is 50 kilometers, the result is 90 minutes, the average speed is:
V=S/T=50 km, /90 minutes x 60 minutes, =33.33 km / h, or 50 km / min (90 minutes /60 minutes) =33.33 km. Divided by 60 minutes means how many hours it takes. We calculate the average speed in hours. 90 minutes is equal to how many hours, then u 50 kilometers in addition to the hour.
Basic theoretical knowledge
Cycling is a mi mechanized sport. Coaches and athletes should master the mechanical principle and mechanical knowledge, effective u of transmission ratio, a reasonable grasp of exerci intensity, cleverly save energy consumption, thus to stamina, of high quality scientific training.goldfinger
air resistance
The car must move forward with some force. The strength of an athlete's foot is called forward force, also called forward thrust. Forward force and force, transmission ratio (i.e., the crank axis to the pedal rod) long reprented by Y Q on behalf of pedaling forward force, power, I reprents the crank length, D reprents the transmission ratio, the relationship between them is expresd as:
Y = Q * I/D
ziThe forward force (Y) is proportional to the pedal force (q) and the crank length (I), inverly proportional to the coefficient of transmission (D). For example, when the transmission coefficient is 94.5 and the crank length is 7, the pedaling force is 25 kg, and the forward force is:让爱一切成空歌词
Y=Q * I/D=25 * 7/94.5=1.85 kg
People riding a bicycle to move forward, even on windless days will feel the wind from the ears flying speed is quick, feel the wind is big, the effect is more obvious, hinder progress. Becau people do not ride in a vacuum, they are surrounded by
air all the time. From a physical point of view. When a person rides a bicycle, the person and the car
squeeze the air in front, and the air gives the car a counterforce, that is, air resistance. After measuring the wind speed at 40 km / h, the area perpendicular to the wind direction is 11 kg per square meter area. Regardless of wind speed 40 km / h or at 40 km per hour speed riding, they are perpendicular to the direction of the wind per square meter area of the air pressure is 11 kg. Bicycle athletes in training and competition, will be in the front ride than in the effort, followed by others in the front rider, the first to break through the air behind the local pressure reducing, surrounded by high pressure air flow to the low pressure, gas vortex, vortex moving forward to produce some impact, followed by behind the rider by the impact force of eddy current forward progress can save energy. And the clor the rider, the less effort. The faster the rider rides, the greater the impact of the vortex on the front, and the follower reasonably borrows the impact of the vortex. You can relatively reduce your physical exertion, conrve your strength and win. Therefore, in peacetime training, attention should be paid to the identification of wind speed, wind direction and training of trailing techniques
When people ride their bikes, they have to break through air resistance, which requires strength. Different wind speed generated by the wind, and the vertical wind direction per square meter by the pressure are not the same, only to overcome the factors, the car can move forward. Such as: no w
demonhunterind ride, the wind area is 0; 5 square meters, bicycle forward speed of 40 kilometers per hour, the air pressure on people is 5.5 kilograms. Therefore, people must u more than 5.5 kilograms
