Reliability. CNC Machining Service|CNC Machining Prototype China
The ability of the product to fulfill the specified functions under specified conditions and within a specified period of time.
Maintainability
Products used under the specified conditions shall be maintained or restored to the ability to perform the specified functions within a specified period of time in accordance with prescribed procedures and methods. Validity availability The ability of a repairable product to have or maintain a defined function at a certain moment.
Durability durability
The ability of a product to fulfill a specified function when the product meets the limits of a certain technical or economical index under specified conditions of use and maintenance. CNC Machining Service|CNC Machining Prototype China
Failure (failure) failure
The product loses its prescribed function. A repairable product is also often referred to as a fault.
Failure mode
Failure manifestation. Failure mechanism Failure mechanism caused by physical and chemical changes and other intrinsic reasons.
Misuse failure
Failure caused by failure to use the product under specified conditions.
Inherent weakness failure
The product is used under specified conditions and fails due to the inherent weakness of the product.
Early failure
The failure of the product due to design and manufacturing defects. CNC Machining Service|CNC Machining Prototype China
Random failure
Product failure due to accidental factors.
Loss of efficiency wear out failure
Product failure caused by aging, wear, loss, fatigue, etc.
Maintenance
Technical management measures taken to maintain or restore the ability of the product to perform the specified functions.
Maintenance
In order to prevent degradation of product performance or to reduce the probability of product failure, maintenance performed according to a predetermined plan or corresponding technical conditions may also be referred to as preventive maintenance.
Repair corrective maintenance
After the product fails, the product is restored to the ability to perform the prescribed functions. The
Reliability
The probability that the product will fulfill the specified function under the specified conditions and within the specified time. CNC Machining Service|CNC Machining Prototype China
Reliability observation
a. The irreparable product refers to the ratio of the number of products that can perform a predetermined function until the end of a predetermined period of time to the number of products that are put into operation at the beginning of the time interval.
b. For a repairable product is the ratio of the number of times that a fault-free operation time of one or more products has reached or exceeded the specified time to the total number of times that the fault-free operation has been performed during the observation time.
Note: When calculating the total number of trouble-free jobs, the last non-fault working time of each product will not be counted if it does not exceed the specified time.
Cumulative failure probability
The probability of a product failing under specified conditions and within a specified period of time is equal to a reduced reliability.
Observations of cumulative failure probability
For irreparable and repairable products are equal to a reduced reliability observations.
Average life (mean time between failures) mean life (mean time between failures)
The average value of life (time without failure). CNC Machining Service|CNC Machining Prototype China
Observed mean life (observed mean time between failures)
a. For irreparable products, when the actual end-of-life values are observed for all test samples, they refer to their mean in arithmetic; when the end-of-life truncation test is observed for all test samples, it refers to the test sample. The ratio of cumulative test time to the number of failures.
b. The term “recoverable product” refers to the ratio of accumulated working time to the number of failures during one observation period of one or more products over its useful life.
Failure rate
The probability that a product that has not yet failed at a certain moment in time will fail within the unit time after that moment.
Failure rate observations
The ratio of the number of products that have failed in a unit time after a certain time to the number of products that have not yet failed to work at that time.
Mean failure rate observations
a. For irreparable products, the ratio of the number of failures to the cumulative working time within a specified period.
b. For a repairable product is the ratio of the number of failures of one or more products to the cumulative working time during an observation period of its useful life. CNC Machining Service|CNC Machining Prototype China
Degree of maintenance
When a product is used under specified conditions, the probability of achieving the specified functional state is maintained or restored when maintenance is performed in accordance with prescribed procedures and methods within a specified period of time.
Mean repair time mean repair time
The average of repair time.
Observed mean repair time observed mean repair time
The ratio of repair time to repair times.
Repair rate
The probability that a product that has reached a certain point in time but has not yet been repaired is repaired within the unit time after that point in time.
Mean repair rate observations observed mean repair time
The probability of completing the repair within a certain observation period. CNC Machining Service|CNC Machining Prototype China
Degree of maintenance
When a product is used under specified conditions, it is maintained or restored to the probability of achieving the specified function state when the product is repaired according to the specified procedures and methods within a specified time.
Mean repair time mean repair time
The average of repair time.
Observed mean repair time observed mean repair time
The ratio of repair time to repair times.
Repair rate
The probability that a product that has reached a certain point in time but has not yet been repaired is repaired within the unit time after that point in time.
Mean repair rate observations observed mean repair time
The probability of completing the repair within a certain observation period. CNC Machining Service|CNC Machining Prototype China
Durability test
To examine the effect of the product’s performance on the impact of the applied stress conditions for a period of time.
Life test
Tests performed to evaluate the product’s life characteristics.
Reliability verification test
Tests to determine whether the product’s reliability characteristics amount to the required water.
Reliability determination test
Tests to determine the value of the product’s reliability characteristics. CNC Machining Service|CNC Machining Prototype China
Laboratory reliability test
Reliability verification or measurement tests performed under specified controlled conditions. Test conditions can simulate on-site conditions, and can also be different from on-site conditions.
Field reliability test
Reliability verification or measurement tests performed under field use conditions.
Screening test screening
To select a product with a certain characteristic or to eliminate an earlier failure.
Constant stress test
Stress remains unchanged in the test. CNC Machining Service|CNC Machining Prototype China
Step stress test
Gradually increase the stress in stages over time.
Progressive stress test
The test of increasing the stress at a constant rate over time.
Accelerated test accelerated test
In order to shorten the test time, the test with the method of increasing the stress is performed without changing the failure mechanism.
Redundancy redundancy
The product contains the components (hardware or software) of the components necessary to perform the specified function. When the redundancy is hardware, it is also called a reserve. CNC Machining Service|CNC Machining Prototype China
Series series
The failure of any of the units that make up the system will result in a logical failure of the entire system.
Series system
The failure of any of the units that make up the system will result in the failure of the entire system.
Parallel parallel
The logic that fails when all the units that make up the system fail.
Parallel system
A system that fails when all the components of the system fail.
Voting system K-out-of-n system(voting system)
In the n units that make up the system, the number of non-failed units is not less than k (k is a number between 1 and n), and the system will not fail, which is also called k/n system. CNC Machining Service|CNC Machining Prototype China
Side-by-side system standby system
Only one of the n units that make up the system works, and when the work unit fails, the failure monitoring device and the conversion device are connected to another system to work.
Failure mode effect and criticality analysis
In the process of system design, through analyzing various potential failure modes and their effects on system functions of the various components of the system and analyzing the severity of the consequences, we propose possible preventive measures to improve product reliability. Design analysis methods.
Failure tree analysis
In the process of system design, by analyzing various factors that may cause system failure (including hardware, software, environment, and per capita factors), a logical block diagram (ie, failure tree) is drawn to determine various possible combinations of system failure causes. The method or its occurrence probability is a design analysis method for calculating system failure probability and adopting corresponding corrective measures to improve system reliability. CNC Machining Service|CNC Machining Prototype China
Safety fail safe
The preventive measures taken at the time of design so that the product fails to cause significant loss of personal material, etc. Reliability programm An important part of the development, production, and use planning of products. It includes the task content, progress requirements, and security conditions for the development, production, and use of each stage in order to achieve a predetermined reliability index for the product. Implementation plan organization, technical measures, etc. Reliability growth reliability growth With the gradual progress of product design, development, and production phases, the reliability characteristics of products have gradually increased. Reliability certification reliability certification A component of the quality certification of a product that is required for reliability. It is a third party other than the manufacturer and consumer, through the review of the manufacturer’s reliability organization and its management and product technical documentation, conducts reliability tests on the product to determine whether the product meets the required level of reliability. . CNC Machining Service|CNC Machining Prototype China
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