9621 Agnes Crossing, Lake Suzanneview, New Mexico Island 84604-9295.
After a rainy winter, the Tver road workers postponed the repair of the asphalt, and at the entrances to Kalyazin such holes appeared that even a hammer could
Everyone drives through holes differently. To avoid bumps, some actively brake on the bumps, roll from side to side and then accelerate so as not to waste time. The torn rhythm of “acceleration-deceleration” monstrously strains all the technical systems of the car: the engine overheats, the brake pads wear out, the hinges break. Sometimes the driver does not have time to slow down before the pit and the car flies into it with all its weight. When braking, the front suspension is compressed, the shock absorber rod develops travel, and at this time there is a bump on the bump. There is a high risk that the stroke of the compressed shock absorber will not be enough to absorb all the energy and that the blow will fall into the suspension bumpers and the body. So driving like this is not an option.
Others pull over on the side of the road and cross dangerous stretches of sand. It’s better, but too long. There are plenty of gentle bumps, potholes and potholes that rock the car so much that the driver and passengers can get seasick. In addition, garbage accumulates along the road: nails and pieces of iron, which will certainly damage the wheels. You won’t get far along the side of the road.
There is only one thing left to do: go ahead and maneuver. But which speed should you choose? I immediately remember the saying of rally racers: “the greater the speed, the fewer holes.” Let’s check it in practice.
The smoothness of the car and the smooth operation of the suspension depend on two quantities, namely the ratio of unsprung and sprung masses, as well as the amplitude and frequency of vibrations. Roughly speaking, if the car has very heavy wheels and extremely long suspension travel, like a tuned SUV, then the body will sway and vibrate and it will be unpleasant to drive.
In a conventional car, the mass ratio fluctuates around 1/15. To make the ride smoother, reduce the weight of the wheels, but you can still increase the weight of the body. For example, a loaded car drives more smoothly.
But there is another factor that affects the operation of the suspension and the stability of the vehicle, which is its speed, or rather its “square”. The higher the speed, the greater the momentum on the wheels, which means the car is more stable. That is, you cannot drive very slowly on bumps.
Granted, if you go too fast, the unsprung masses will start to bludgeon from below, so the suspension won’t last long. Too fast, almost rallying over bumps leads to destruction of the racks, increased tire wear and destruction of rubber-metal compounds. They cannot withstand high vibration energy. As a result, after an hour of driving, the tire is at risk of breaking to shreds, as are shock absorbers. Therefore, you need to choose the optimal speed.
Some time ago, the authors of the MythBusters program, Jamie Hyneman and Adam Savage, took care of the problem of the pits. They wondered at what speed the propeller shaft of a rear-wheel drive car could fall into a hole. It turned out that at 45-50 km / h and at the same speed it causes maximum damage to the car. Similar things happened to the old Zhuguli. The edge dragging along the asphalt digs into the roughness and throws the car up.
But if you increase the speed, the shaft just jumps over the pit. It’s the same with wheels. Up to a speed of 40-50 km / h, they fall into the pits, but when gas is added, they jump.
The higher the speed, the stronger the oscillation frequency, which means that the wheel simply does not have time to fail. At certain “km / h”, a blow to the tire will slip through and damage it, and therefore a hernia can be avoided.
The validity of this conclusion was independently verified some time ago. When I maintained a speed of 80 km / h on a MINI Countryman with a stiff suspension, the suspension rumbled, but smoothed out the bumps. And as soon as it dropped to 40 km / h to save the car, the wheel immediately fell into a big hole and the tire was punctured.
In general, it is necessary to add gas and not be afraid of holes. The best speed here might be 55-65 mph, because the vibration energy of the suspension causes the wheel to jump over small holes, and the car’s speed isn’t high enough to damage the shock absorbers and tires. However, it’s not worth it. If the potholes are too big, it is better to maneuver or swerve to the side of the road. Unfortunately, we still have enough such holes on regional highways.
Everyone drives through holes differently. To avoid bumps, some actively brake on the bumps, roll from side to side and then accelerate so as not to waste time. The torn rhythm of “acceleration-deceleration” monstrously strains all the technical systems of the car: the engine overheats, the brake pads wear out, the hinges break. Sometimes the driver does not have time to slow down before the pit and the car flies into it with all its weight. When braking, the front suspension is compressed, the shock absorber rod develops travel, and at this time there is a bump on the bump. There is a high risk that the stroke of the compressed shock absorber will not be enough to absorb all the energy and that the blow will fall into the suspension bumpers and the body. So driving like this is not an option.
Others pull over on the side of the road and cross dangerous stretches of sand. It’s better, but too long. There are plenty of gentle bumps, potholes and potholes that rock the car so much that the driver and passengers can get seasick. In addition, garbage accumulates along the road: nails and pieces of iron, which will certainly damage the wheels. You won’t get far along the side of the road.
There is only one thing left to do: go ahead and maneuver. But which speed should you choose? I immediately remember the saying of rally racers: “the greater the speed, the fewer holes.” Let’s check it in practice.
The smoothness of the car and the smooth operation of the suspension depend on two quantities, namely the ratio of unsprung and sprung masses, as well as the amplitude and frequency of vibrations. Roughly speaking, if the car has very heavy wheels and extremely long suspension travel, like a tuned SUV, then the body will sway and vibrate and it will be unpleasant to drive.
In a conventional car, the mass ratio fluctuates around 1/15. To make the ride smoother, reduce the weight of the wheels, but you can still increase the weight of the body. For example, a loaded car drives more smoothly.
But there is another factor that affects the operation of the suspension and the stability of the vehicle, which is its speed, or rather its “square”. The higher the speed, the greater the momentum on the wheels, which means the car is more stable. That is, you cannot drive very slowly on bumps.
Granted, if you go too fast, the unsprung masses will start to bludgeon from below, so the suspension won’t last long. Too fast, almost rallying over bumps leads to destruction of the racks, increased tire wear and destruction of rubber-metal compounds. They cannot withstand high vibration energy. As a result, after an hour of driving, the tire is at risk of breaking to shreds, as are shock absorbers. Therefore, you need to choose the optimal speed.
Some time ago, the authors of the MythBusters program, Jamie Hyneman and Adam Savage, took care of the problem of the pits. They wondered at what speed the propeller shaft of a rear-wheel drive car could fall into a hole. It turned out that at 45-50 km / h and at the same speed it causes maximum damage to the car. Similar things happened to the old Zhuguli. The edge dragging along the asphalt digs into the roughness and throws the car up.
But if you increase the speed, the shaft just jumps over the pit. It’s the same with wheels. Up to a speed of 40-50 km / h, they fall into the pits, but when gas is added, they jump.
The higher the speed, the stronger the oscillation frequency, which means that the wheel simply does not have time to fail. At certain “km / h”, a blow to the tire will slip through and damage it, and therefore a hernia can be avoided.
The validity of this conclusion was independently verified some time ago. When I maintained a speed of 80 km / h on a MINI Countryman with a stiff suspension, the suspension rumbled, but smoothed out the bumps. And as soon as it dropped to 40 km / h to save the car, the wheel immediately fell into a big hole and the tire was punctured.
In general, it is necessary to add gas and not be afraid of holes. The best speed here is perhaps 55-65 mph, because the vibration energy of the suspension causes the wheel to jump over small holes and the car’s speed is not high enough to damage the shock absorbers and tires. However, it’s not worth it. If the potholes are too big, it is better to maneuver or swerve to the side of the road. Unfortunately, we still have enough such holes on regional highways.
Source: Avto Vzglyad
Donald Salinas is an experienced automobile journalist and writer for Div Bracket. He brings his readers the latest news and developments from the world of automobiles, offering a unique and knowledgeable perspective on the latest trends and innovations in the automotive industry.
